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WO2018018991A1 - 用于温度检测的装置和用于补偿显示面板的温度的装置 - Google Patents

用于温度检测的装置和用于补偿显示面板的温度的装置 Download PDF

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Publication number
WO2018018991A1
WO2018018991A1 PCT/CN2017/083772 CN2017083772W WO2018018991A1 WO 2018018991 A1 WO2018018991 A1 WO 2018018991A1 CN 2017083772 W CN2017083772 W CN 2017083772W WO 2018018991 A1 WO2018018991 A1 WO 2018018991A1
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WIPO (PCT)
Prior art keywords
temperature
inverter
voltage
coupled
display panel
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/CN2017/083772
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English (en)
French (fr)
Inventor
童振霄
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Priority to US15/569,129 priority Critical patent/US10198990B2/en
Publication of WO2018018991A1 publication Critical patent/WO2018018991A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/01—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using semiconducting elements having PN junctions
    • G01K7/015—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using semiconducting elements having PN junctions using microstructures, e.g. made of silicon
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/01—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using semiconducting elements having PN junctions
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]

Definitions

  • Embodiments of the present disclosure relate to the field of display technologies, and in particular, to an apparatus and method for temperature detection, an apparatus and method for compensating temperature of a display panel, and a display apparatus.
  • the flat panel display device has the advantages of being thin and light, low in power consumption, and easy to carry, and has been widely used in electronic products.
  • a thin film transistor plays an important role as a display control unit in the field of flat panel display (FPD) such as liquid crystal display (LCD), organic light emitting diode display (OLED), electronic paper display (EPD), and microdisplay.
  • LCD liquid crystal display
  • OLED organic light emitting diode display
  • EPD electronic paper display
  • microdisplay microdisplay
  • the display panel Since the characteristics of the liquid crystal and the operational stability of the OLED may drift as the temperature changes, and the electrical characteristics of the thin film transistor also change with temperature, when the temperature of the screen of the display panel changes, the display The effect will also change. In order to exhibit the same or similar display effects under different temperature conditions, it is necessary to temperature compensate the display panel to reduce the drift of the display effect with temperature. Therefore, there is a need to continuously increase the temperature compensation effect of the display panel.
  • Embodiments of the present disclosure provide an apparatus and method for temperature detection, an apparatus and method for compensating temperature of a display panel, and a display apparatus, thereby improving compensation of temperature of the display panel Degree effect.
  • an apparatus for temperature detection comprising: a first inverter configured to invert a voltage signal at an input to output an inverted signal; a delay module, and The first inverter is coupled and configured to delay the inverted signal and output the delayed inverted signal as an output signal; the switching transistor has a control electrode coupled to the delay module, the first pole The first voltage signal end is coupled, the second pole is coupled to the input end of the first inverter, and configured to provide the first voltage signal from the first voltage signal end to the first inverter according to the output signal
  • the first capacitor has a first end coupled to the first electrode of the switching transistor, a second end coupled to the input end of the first inverter, and a temperature sensing transistor whose gate is input with a subthreshold bias a voltage, a first pole coupled to the input end of the first inverter, a second pole coupled to the second voltage signal terminal, and configured to have a channel current of the temperature sensing transistor at a subthreshold bias voltage
  • the delay module includes an even number of inverters coupled in series.
  • the delay module includes: a first resistor having a first end coupled to an output end of the first inverter, a second end being an output end of the delay module, and a second capacitor, The first end is coupled to the second end of the first resistor, and the second end is coupled to the second voltage signal end.
  • the delay module includes: a first resistor having a first end coupled to an output end of the first inverter, a second end being an output end of the delay module, and a second capacitor, The first end is coupled to the second end of the first resistor, and the second end is coupled to the input end of the first inverter.
  • an even number of series coupled inverters includes adjacent second and third inverters.
  • the delay module further includes: a second resistor, the first end of which is coupled to the output end of the second inverter, the second end is coupled to the input end of the third inverter; and the third capacitor is first The end is coupled to the second end of the second resistor, and the second end is coupled to the second voltage signal end.
  • an even number of series coupled inverters includes adjacent second and third inverters.
  • the delay module further includes: a second resistor, the first end of which is coupled to the output end of the second inverter, the second end is coupled to the input end of the third inverter; and the third capacitor is first The end is coupled to the second end of the second resistor, and the second end is coupled to the input end of the second inverter.
  • the delay module further includes: a third resistor, the first end and the first The second end of the two resistors is coupled, and the second end is coupled to the input end of the third inverter.
  • the temperature sensing transistor is a thin film transistor.
  • an apparatus for compensating for a temperature of a display panel comprising: the apparatus for temperature detection described above; and a filtering module configured to perform an output signal of the apparatus for temperature detection a filter; the converter configured to convert the filtered output signal into a temperature code; and a power management module configured to adjust a drive voltage output to the display panel based on the temperature code.
  • the temperature compensation device further includes: a gamma voltage generation module configured to generate a compensated gamma voltage value when the temperature code is outside the threshold interval; and a source voltage driving module It is configured to input a corresponding gamma voltage to the pixel driving unit of the display panel according to the compensated gamma voltage value.
  • the gamma voltage generation module generates a compensated gamma voltage value by adjusting a gamma curve reference point.
  • a display device including the above-described device for compensating for a temperature of a display panel.
  • a device for temperature detection is disposed in a display panel.
  • a method of detecting temperature using a device for temperature detection comprising: inputting a high level signal to a first voltage signal end and a low level signal to a second voltage signal end And inputting a subthreshold bias voltage to the gate of the temperature sensing transistor, so that the output of the delay module outputs an output signal that changes with temperature; filtering the output signal; converting the filtered output signal into a temperature code; The temperature is determined based on the temperature code.
  • a method for compensating for a temperature of a display panel comprising: inputting a high level signal to a first voltage signal end of the apparatus for temperature detection, to a second voltage signal end Input a low level signal, and input a subthreshold bias voltage to the control terminal of the temperature sensing transistor, so that the output end of the delay module outputs an output signal that varies with the temperature of the display panel; filters the output signal; The output signal is converted into a temperature code; and the driving voltage output to the display panel is adjusted according to the temperature code.
  • the method for compensating for the temperature of the display panel further includes: when the temperature is The compensated gamma voltage value is generated when the degree code is outside the threshold interval; and the corresponding gamma voltage is input to the pixel driving unit of the display panel according to the compensated gamma voltage value.
  • the display panel can be compensated according to different temperature intervals.
  • the temperature fluctuation is not large, it is possible to compensate for the drift of the display effect with temperature only by adjusting the driving voltage of the display panel, without performing a more complicated gamma voltage adjustment.
  • the driving voltage of the display panel and the gamma voltage can be adjusted at the same time, thereby better compensating for display problems occurring at too high or too low temperatures.
  • the compensated gamma voltage value is generated by adjusting the gamma curve reference point.
  • the device for temperature detection can be constituted by a transistor, a resistor, a capacitor, and an inverter without any other special temperature sensing device or operational amplifier, etc., thereby simplifying the structure of the device and reducing the cost, and It can be integrated anywhere in the display panel.
  • the apparatus for temperature detection of the embodiment of the present disclosure can better detect a change in the temperature inside the screen, thereby being used for compensating the display, compared to a temperature detecting module provided outside the display panel or in the drive integrated module (IC)
  • the panel's temperature device reacts faster and more accurately.
  • the device for temperature detection can be implemented using a thin film transistor (TFT) process to improve process compatibility with the TFT array substrate of the display panel.
  • TFT thin film transistor
  • the display panel can be compensated according to different temperature intervals.
  • the temperature fluctuation is not large, it is possible to compensate for the drift of the display effect with temperature only by adjusting the driving voltage of the display panel, without performing a more complicated gamma voltage adjustment.
  • the driving voltage of the display panel and the gamma voltage can be adjusted at the same time, thereby better compensating for display problems occurring at too high or too low temperatures.
  • FIG. 1 is a schematic diagram of an apparatus for temperature detection, in accordance with an embodiment of the present disclosure
  • FIGS. 2A, 2B, 2C, 2D, 2E, and 2F are schematic views of an apparatus for temperature detection according to an embodiment of the present disclosure
  • FIG 3 is a schematic illustration of the signal at the input of the apparatus for temperature sensing shown in Figure 2A;
  • FIG. 4 is a schematic block diagram of an apparatus for compensating for temperature of a display panel, in accordance with an embodiment of the present disclosure
  • FIG. 5 illustrates a graph of waveform frequency and temperature code values of an output signal of a device for temperature detection as a function of temperature variation within a display panel screen, in accordance with an embodiment of the present disclosure
  • FIG. 6 is a flow chart of a method for temperature detection, in accordance with an embodiment of the present disclosure.
  • FIG. 7 is a flow chart of a method for compensating for temperature of a display panel, in accordance with an embodiment of the present disclosure.
  • embodiments of the present disclosure provide an apparatus and method for temperature detection, an apparatus and method for compensating temperature of a display panel, and a display apparatus, thereby improving an effect of compensating for temperature of the display panel.
  • an apparatus and method for temperature detection, an apparatus and method for compensating temperature of a display panel, and a display apparatus of an embodiment of the present disclosure will be specifically described in the corresponding embodiments.
  • FIG. 1 is a schematic diagram of an apparatus for temperature detection, in accordance with an embodiment of the present disclosure.
  • the means for temperature detection comprises: a first inverter inverters INV1, the DM delay module, the switching transistor T sw, a first capacitor C 1, and a temperature sensitive transistor T sen.
  • the first inverter INV1 inverts the voltage signal of the input terminal A and outputs an inverted signal.
  • the delay module DM is coupled to the first inverter INV1 and configured to delay the inverted signal. And output the delayed inverted signal as an output signal.
  • the control electrode of the switching transistor T sw is coupled to the output terminal B (in other words, coupled to the output terminal B of the delay module DM), the first pole is coupled to the first voltage signal terminal (such as the operating voltage VDD), and the second The pole is coupled to the input A of the inverter INV 1 .
  • the switching transistor Tsw supplies the operating voltage VDD to the input terminal of the first inverter INV1 according to the output signal.
  • the switching transistor Tsw is an N-type transistor.
  • the first end of the first capacitor C 1 is coupled to the first electrode of the switching transistor T sw , and the second end is coupled to the input terminal A of the inverter INV 1 .
  • the switching transistor T sw capacitors C 1 and cooperate with the first inverter INV 1 and the DM delay module, to generate a periodically varying output signal, which will be described in detail with reference to FIG 2 later.
  • the control electrode of the temperature sensing transistor T sen is input with a subthreshold bias voltage (where V sub-th represents a subthreshold bias voltage), and the first pole is coupled to the input terminal A of the inverter INV 1 , and the second pole and the second The two voltage signal terminals (eg, ground voltage VSS) are coupled.
  • V sub-th represents a subthreshold bias voltage
  • the channel of the temperature-sensing transistor T sen is in a weak inversion state, the channel current is in a monotonically increasing relationship with the temperature, and the channel current is less than the normal bias current.
  • the temperature sensitive transistor T sen can employ various existing transistors, and can be, for example, a thin film transistor TFT. As an example, as shown in FIG. 1, the temperature sensing transistor Tsen is an N-type transistor.
  • FIGS. 2A-2F show schematic diagrams of an apparatus for temperature detection in accordance with an alternative embodiment of the present disclosure.
  • the inverters INV2, INV3, INV4, and INV5 constitute the delay module DM shown in FIG. 1.
  • Other first inverter inverters INV1 the switching transistor T sw, capacitors C 1 and a first temperature sensitive transistor T sen in the structure of FIG. 1, and omitted.
  • any of the inverters INV 1 -INV 5 can be implemented using various existing inverter structures.
  • a complementary metal oxide semiconductor (CMOS) inverter including an N-channel metal oxide semiconductor field effect transistor (MOSFET) and a P-channel MOSFET can be employed.
  • MOSFET metal oxide semiconductor field effect transistor
  • the gates of the two MOSFETs are coupled together as the input of the inverter, and the drains of the two MOSFETs are coupled together as the output of the inverter.
  • the source of the P-channel MOSFET is connected to the operating voltage VDD, and the source of the N-channel MOSFET is grounded to VSS.
  • the output voltage of the first inverter When the voltage at the input terminal A of the first inverter is low, the output voltage of the first inverter is high, and vice versa.
  • the four inverters INV 2 -INV 5 coupled in series with the end and tail when the input voltage is low, the output voltage is also low, and vice versa. Therefore, the phase of the input signal is not changed, but only the transmission delay (which is the sum of the transmission delays of the four inverters) is introduced. Therefore, four inverters INV 2 -INV 5 coupled in series with each other in series can constitute a delay module DM. Accordingly, the five inverters INV 1 -INV 5 coupled in series with each other can be considered to couple the first inverter INV 1 with the delay module DM.
  • the apparatus for temperature detection of FIG. 2B is substantially the same as that of FIG. 2A except that the delay module DM is an RC delay module.
  • the RC delay in the module, a first terminal of the resistor R 1 and the output terminal of the inverter INV is coupled to a first end coupled to the output terminal B.
  • a first end of capacitor C 2 is coupled to a second end of resistor R 1 and a second end of capacitor C 2 is coupled to ground.
  • a second terminal of the capacitor C of the inverter INV 2 has an input terminal A is coupled.
  • the second end of resistor R 1 is the output B of the RC delay module (ie, the output B of the device for temperature sensing).
  • the RC delay module can function similarly to an even number of inverters coupled in series, and can adjust the period of the waveform of the output signal of the output terminal B by adjusting the values of the resistor R 1 and the capacitor C 2 . t per , and then adjust its frequency.
  • the device for temperature detection of FIG. 2D is substantially the same as FIG. 2A except that the delay module includes both an even number of series coupled inverters and an RC delay module.
  • the delay module includes at least two inverters INV 2 and INV 3 coupled in series, a resistor R 2 , and a capacitor C 3 .
  • Resistor R 2 is located in the coupling line between the output of inverter INV 2 and the input of inverter INV 3 .
  • the first end of the capacitor C 3 is coupled to the coupling point of the resistor R 2 and the input end of the inverter INV 3
  • the second end of the capacitor C 3 is coupled to the input end of the inverter INV 2 .
  • a second capacitor C 3 is grounded.
  • it is possible to adjust the period of the waveform output signal at the output of the means for temperature detection by adjusting t per resistor R 2 and capacitor C 3 values, thereby adjusting its frequency.
  • delay module DM may optionally further comprise a resistor R 3, which is located between the coupling line and the input terminal of the inverter INV 3 in the resistor R. Resistor R 3 may be prevented from flowing into the inverter when the voltage at the input of the inverter INV 3, INV current 3 of hops is too large, thereby protect.
  • the means for temperature detection of the embodiments of the present disclosure is not limited to the examples described above.
  • the delay module is not limited to including only four inverters connected in series as shown in FIG. 2A, but only an even number of inverters connected in series.
  • the RC delay module is not limited to including only one resistor and one capacitor as shown in FIGS. 2B-2C, and may include other resistors and/or capacitors to constitute an RC delay module of various configurations.
  • the delay module is not limited to an even number of inverting or RC delay modules or combinations thereof, but may also include various other types of delay modules.
  • Coupled includes both direct and indirect connections between the elements.
  • Figure 3 is a schematic illustration of the signal at input A of the apparatus for temperature sensing shown in Figure 2A.
  • the operating voltage VDD is input to the first pole of the switching transistor T sw , and the voltage V A at the input terminal A of the first inverter INV 1 is maintained at a low voltage VL (eg, close to 0V) low voltage), the switching transistor T sw off capacitors C 1 is charged.
  • the low voltage VL at the input terminal A is transmitted to the output terminal B of the inverter INV 5 (wherein the time interval between t 0 and t 1 corresponds to the sum of the delay times of the five inverters INV 1 -INV 5 ) .
  • the voltage at the output terminal B is high voltage VH
  • the high voltage VH is input to the switching transistor T sw control electrode of the switching transistor T sw is turned on.
  • a voltage V A at the input of the high voltage VH is pulled quickly from a low voltage VL.
  • Capacitor C 1 is in a short-circuit state, and capacitor C 1 is discharged, neutralizing the charge accumulated on the two plates.
  • the high voltage VH at the input terminal A is transmitted to the output terminal B of the inverter INV 5 (where the time interval between t 2 and t 3 corresponds to the five inverters INV 1 -INV The sum of the delay times of 5 ), since there are an odd number of inverters, the voltage at the output terminal B is the low voltage VL.
  • the low voltage VL at the output B is input to the control electrode of the switching transistor T sw, the switching transistor T sw is turned off. Since the switching transistor T sw is turned off, the VH A high voltage at the input terminal of it is discharged through the transistor T sen temperature sensitive, so that the voltage V A at the input terminal A gradually decreases to a low voltage VL. As the voltage V A at the input terminal A gradually decreases, a voltage is generated across the capacitor C 1 difference, the capacitor C 1 starts to be charged.
  • the low voltage VL is held at input A and transmitted to the output B of inverter INV 5 (where the time interval between t 4 and t 5 corresponds to five inverters INV 1 - The sum of the delay times of INV 5 ).
  • the period t per of the oscillation waveform is a time interval between times t 1 and t 5
  • the discharge time t d is a time interval between times t 3 and t 4 .
  • the oscillating waveform shown in FIG. 3 is the voltage waveform at the input terminal A
  • the waveform of the output signal at the output terminal B of the device for temperature detection can be reversed by the voltage waveform at the input terminal A. Get it together.
  • the temperature-sensing transistor T sen is in a subthreshold state under the bias of the voltage V sub-th , and the discharge current is small, so the discharge time t d between the times t 3 and t 4 is long.
  • the subthreshold current magnitude of the temperature-sensing transistor T sen is monotonically increasing with temperature. When the temperature rises, the discharge current flowing through the temperature sensing transistor T sen increases, and the discharge time t d is shortened, so that the waveform period t per outputted by the temperature detecting module is shortened and the frequency is increased.
  • a device for temperature detection may be constituted by a switching transistor, a capacitor, and a basic inverter without using a complicated module such as an operational amplifier, thereby facilitating integration in a TFT substrate (for example, a silicon-based microdisplay OLED) In the substrate).
  • temperature sensing in a device for temperature sensing can utilize a TFT device (eg, a silicon-based CMOS device) with a monotonically increasing relationship between channel current and temperature and a channel current that is less than a normal bias current when the threshold is biased. To achieve, no other special temperature sensing devices are needed.
  • the device for temperature detection can be implemented by a TFT process (for example, a silicon-based CMOS process), and the process compatibility with the TFT array substrate of the display panel is good.
  • the means for temperature detection can be integrated at any position inside the display panel. Embodiments of the present disclosure can better detect changes in temperature within the screen compared to devices for temperature detection disposed outside of the display panel or in the driver IC The situation, and the means used to compensate for the temperature of the display panel, can react more quickly and accurately.
  • the compensation device for compensating for temperature includes at least a temperature detecting module 402, a filtering module 404, a converter 406, and a power management module 408.
  • the temperature detection module 402 can employ the apparatus for temperature detection described above to output an output signal that varies with the temperature of the display panel. As described above, the temperature detecting module can be integrated at any position in the display panel (for example, integrated on the array substrate or the color film substrate of the liquid crystal display panel, integrated on the array substrate or the package cover of the OLED display panel, etc. Wait).
  • Filtering module 404 is configured to filter the output signal of temperature detection module 402 to filter out the noise voltage of the output signal.
  • the filtering module 404 can be implemented by using an existing technique of filtering and shaping a signal.
  • the filtering module 404 can include a CMOS buffer.
  • Converter 406 can convert the filtered output signal to a temperature code.
  • converter 406 is an analog to digital converter.
  • the temperature code can be, for example, a N-bit digital code, and there is a one-to-one monotonically increasing relationship between the digitally encoded value and the frequency of the oscillating waveform of the output signal of the temperature sensing module, as shown in FIG.
  • the temperature detection module 402 of the embodiment of the present disclosure obtains the output waveform frequency and its corresponding temperature code while obtaining the temperature of the display panel using other types of temperature detecting devices of the prior art, thereby obtaining the functional relationship shown in FIG.
  • the temperature code may also be in a one-to-one monotonically increasing relationship with the period of the oscillating waveform of the temperature detection module 402. Since the frequency of the oscillating waveform is monotonically increasing with temperature, the period of the oscillating waveform is monotonically decreasing with temperature. Regardless of whether the temperature code corresponds to the frequency or period of the oscillating waveform, it can be used to represent the temperature for temperature compensation.
  • the configuration of the apparatus for compensating the display panel of the embodiment of the present disclosure is not limited thereto as long as it is possible to generate a temperature code indicating the temperature of the display panel.
  • the power management module 408 adjusts the driving voltage (for example, ELVDD, ELVSS) output to the display panel according to the temperature code to perform temperature compensation on the display panel (for example, by changing the power supply voltage difference of the pixel driving module in the display panel to improve the panel temperature). Display effect problems caused by drift).
  • power management module 408 can include a control portion and a direct current to direct current (DC-DC) converter.
  • the control unit may generate an adjusted driving voltage value for the display panel based on the temperature code. For example, a curve between the temperature code and the optimum display panel drive voltage value can be obtained experimentally.
  • the control unit may generate the adjusted driving voltage value based on the curve and the current temperature code.
  • the control unit may use an exclusive integrated module (ASIC), a field programmable gate array (FPGA), or the like, or may use a processor chip.
  • ASIC exclusive integrated module
  • FPGA field programmable gate array
  • the DC-to-DC converter can generate an adjusted driving voltage from, for example, a predetermined voltage according to the adjusted driving voltage value to input it to the display panel.
  • the means for compensating for the temperature of the display panel may also optionally include a gamma voltage generating module 410 and a source voltage driving module 412.
  • the gamma voltage generation module 410 is configured to generate a compensated gamma voltage value when the temperature code is outside of the threshold interval. Curve shown in Figure 5, the temperature of the code (TC) to the threshold value interval [T th-, T th +] corresponding to [TC th-, TC th +] , where T th + T th- and are without gamma
  • the lower temperature limit and the upper temperature limit of the temperature range of the voltage regulation, TC th- and TC th+ are the lower limit of the temperature code and the upper limit of the temperature code corresponding to the lower limit of the temperature and the upper limit of the temperature, respectively.
  • the lower temperature limit and the upper temperature limit may be determined, for example, by gradually decreasing the temperature from the normal operating temperature, and performing only the compensation adjustment of the display panel driving voltage at each temperature, when the compensated display effect and the desired display effect just exceed When the deviation is predetermined, the temperature can be determined as T th- . Similarly, the temperature is gradually increased from the normal operating temperature, and only the compensation adjustment of the display panel driving voltage is performed at each temperature, and when the compensated display effect and the desired display effect just exceed the predetermined deviation, the temperature can be determined as T th+ .
  • the gamma voltage generation module 410 may output a gamma voltage curve that matches the current temperature by adjusting a gamma curve reference point to generate a compensated gamma voltage value.
  • the gamma voltage generating module 410 can be implemented as a dedicated integrated module (ASIC), a field programmable gate array (FPGA), or the like, or can be implemented as a processor chip.
  • the source voltage driving module 412 is configured to input a corresponding gamma voltage to the pixel driving unit of the display panel according to the compensated gamma voltage value to compensate for brightness and chromaticity of the display panel.
  • the source voltage drive module can be implemented using a variety of existing source drive technologies.
  • the display panel may be compensated according to different temperature intervals.
  • the temperature fluctuation is not large, it is possible to compensate for the drift of the display effect with temperature only by adjusting the driving voltage of the display panel, without performing a more complicated gamma voltage adjustment.
  • the driving voltage of the display panel and the gamma voltage can be adjusted at the same time, thereby better compensating for display problems occurring at too high or too low temperatures. That is to say, when the temperature compensation device is within a certain range of temperature variation, for example, ELVDD and EVLSS can be directly compensated to adjust the panel display effect.
  • the gamma voltage curve is compensated after a certain range is exceeded, and the display panel is adjusted together with ELVDD and ELVSS.
  • a display device (eg, an LCD display device, an OLED display device, etc.) according to an embodiment of the present disclosure includes a display panel and a device for compensating for the temperature of the display panel.
  • the device for temperature detection can be integrated at any position in the display panel (for example, integrated on an array substrate or a color film substrate of the liquid crystal display panel, integrated on the array substrate or package cover of the OLED display panel) On, etc.). Since the above-described means for compensating for the temperature of the display panel is employed, the display device can obtain temperature compensation more quickly and accurately, and will not be described again.
  • FIG. 6 is a flow chart of a method for detecting temperature, such as using the temperature detecting device 402 illustrated in FIG. 4, in accordance with an embodiment of the present disclosure.
  • a high level signal (such as an operating voltage) is input to the first voltage signal terminal, and a low level signal (such as ground) is input to the second voltage signal terminal, and the temperature sensing transistor is controlled.
  • the pole input subthreshold bias voltage causes the output of the delay module to output an output signal that varies with temperature.
  • the oscillating waveform of the output signal is filtered, which may be performed by filtering module 404 shown in FIG.
  • the filtered output signal is converted to a temperature code. This can be performed by the converter 406 shown in FIG.
  • a temperature is determined from the temperature code based on a function of the temperature code and the temperature.
  • the temperature code can correspond to the frequency or period of the oscillating waveform. In the case where the temperature code corresponds to the frequency of the oscillating waveform, the temperature code is monotonically increasing as a function of temperature. In the case where the temperature code corresponds to the period of the oscillating waveform, the temperature code is monotonically decreasing as a function of temperature.
  • FIG. 7 is a flow chart of a method for compensating for temperature of a display panel, in accordance with an embodiment of the present disclosure.
  • the dashed box in the figure indicates an optional step.
  • the method can be used to temperature compensate a display panel (eg, an LCD display panel, an OLED display panel, etc.).
  • a high level signal (such as an operating voltage) is input to the first voltage signal end of the temperature detecting module 402, and a low level signal (such as ground) is input to the second voltage signal end, and
  • the gate of the temperature-sensing transistor inputs a sub-threshold bias voltage, so that the output of the delay module outputs an output signal that varies with the temperature of the display panel.
  • the oscillating waveform of the output signal is filtered. This can be performed by the filtering module 404 shown in FIG.
  • the filtered output signal is converted to a temperature code for temperature compensation. This can be performed by the converter 406 shown in FIG.
  • the drive voltage output to the display panel is adjusted based on the temperature code. This can be performed by the power management module 408 shown in FIG.
  • the method for compensating for the temperature of the display panel of an embodiment of the present disclosure may optionally include steps 710 and 712.
  • a compensated gamma voltage value is generated when the temperature code is outside of the threshold interval. For example, after obtaining the temperature code, it can be determined whether the temperature code is outside the threshold interval. The compensated gamma voltage value can be generated when it is determined that the temperature code is outside of the threshold interval. As previously mentioned, further, the compensated gamma voltage value can be generated by adjusting the gamma curve reference point. Step 710 can be performed by gamma voltage generation module 410 shown in FIG.
  • a corresponding gamma voltage may be input to the pixel driving unit of the display panel according to the compensated gamma voltage value. This can be driven by the source voltage driving module 412 shown in FIG. carried out.
  • the drift of the display effect with temperature can be adjusted by the compensated display panel power supply voltage and the compensated gamma voltage curve, thereby improving display problems caused by temperature changes of the display panel.

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Abstract

用于温度检测的装置和方法、用于温度补偿的装置和方法、及显示装置。用于温度检测的装置包括：第一反相器（INV1），其被配置为将输入端的电压信号反相，以输出反相信号；延时模块（DM），其使反相信号延时，并输出被延时的反相信号，作为输出信号；开关晶体管（T sw），其根据输出信号，将来自第一电压信号端的第一电压信号提供至第一反相器（INV1）的输入端；第一电容器（C 1），其第一端与开关晶体管（T sw）的第一极耦接，第二端与第一反相器（INV1）的输入端耦接；以及温感晶体管（T sen），在亚阈值偏置电压下，温感晶体管（T sen）的沟道电流与温度成正比。

Description

用于温度检测的装置和用于补偿显示面板的温度的装置
相关申请的交叉引用
本申请要求于2016年7月25日递交的中国专利申请第201610586140.0号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开的实施例涉及显示技术领域，特别涉及一种用于温度检测的装置和方法、用于补偿显示面板的温度的装置和方法、以及显示装置。
背景技术
随着移动产品的飞速发展与应用，人们对新型电子产品的需求越来越大，显示面板也有了快速的发展。平板显示装置具有轻薄、低功耗、易于携带等优点，在电子产品中得到了广泛的应用。其中，薄膜晶体管(TFT)作为显示控制单元在平板显示(FPD)领域诸如液晶显示(LCD)、有机发光二极管显示(OLED)、电子纸显示(EPD)以及微显示等领域中起着重要作用。
由于液晶的特性以及OLED的操作稳定性会随着温度的变化而产生漂移，同时薄膜晶体管的电学特性也会随着温度的变化而变化，因此，在显示面板的屏内温度发生变化时，显示效果也会随之发生变化。为了在不同温度的条件下呈现相同或相似的显示效果，有必要对显示面板进行温度补偿以减轻显示效果随温度的漂移。因此，存在着不断提高显示面板的温度补偿效果的需求。
发明内容
本公开的实施例提供了一种用于温度检测的装置和方法、用于补偿显示面板的温度的装置和方法、以及显示装置，从而提高补偿显示面板的温 度的效果。
根据本公开的一方面，提供了一种用于温度检测的装置，包括：第一反相器，其被配置为将输入端的电压信号反相，以输出反相信号；延时模块，其与第一反相器耦接，并被配置为使反相信号延时，并输出被延时的反相信号，作为输出信号；开关晶体管，其控制极与延时模块耦接，第一极与第一电压信号端耦接，第二极与第一反相器的输入端耦接，并被配置为根据输出信号，将来自第一电压信号端的第一电压信号提供至第一反相器的输入端；第一电容器，其第一端与开关晶体管的第一极耦接，第二端与第一反相器的输入端耦接；以及温感晶体管，其控制极被输入亚阈值偏置电压，第一极与第一反相器的输入端耦接，第二极接地与第二电压信号端耦接，并被配置为在亚阈值偏置电压下，温感晶体管的沟道电流与温度成正比。
在本公开的实施例中，延时模块包括偶数个串联耦接的反相器。
在本公开的实施例中，延时模块包括：第一电阻器，其第一端与第一反相器的输出端耦接，第二端为延时模块的输出端；以及第二电容器，其第一端与第一电阻器的第二端耦接，第二端与第二电压信号端耦接。
在本公开的实施例中，延时模块包括：第一电阻器，其第一端与第一反相器的输出端耦接，第二端为延时模块的输出端；以及第二电容器，其第一端与第一电阻器的第二端耦接，第二端与第一反相器的输入端耦接。
在本公开的实施例中，偶数个串联耦接的反相器包括相邻的第二反相器和第三反相器。延时模块还包括：第二电阻器，其第一端与第二反相器的输出端耦接，第二端与第三反相器的输入端耦接；以及第三电容器，其第一端与第二电阻器的第二端耦接，第二端与第二电压信号端耦接。
在本公开的实施例中，偶数个串联耦接的反相器包括相邻的第二反相器和第三反相器。延时模块还包括：第二电阻器，其第一端与第二反相器的输出端耦接，第二端与第三反相器的输入端耦接；以及第三电容器，其第一端与第二电阻器的第二端耦接，第二端与第二反相器的输入端耦接。
在本公开的实施例中，延时模块还包括：第三电阻器，其第一端与第 二电阻器的第二端耦接，第二端与第三反相器的输入端耦接。
在本公开的实施例中，温感晶体管为薄膜晶体管。
根据本公开的另一方面，提供了一种用于补偿显示面板的温度的装置，包括：上述用于温度检测的装置；滤波模块，其被配置为对用于温度检测的装置的输出信号进行滤波；转换器，其被配置为将经滤波的输出信号转换成温度代码；以及电源管理模块，其被配置为根据温度代码，调节输出到显示面板的驱动电压。
在本公开的实施例中，温度补偿装置还包括：伽玛电压产生模块，其被配置为当温度代码在阈值区间以外时，产生经补偿的伽玛电压值；以及源极电压驱动模块，其被配置为根据经补偿的伽玛电压值，将相应的伽玛电压输入到显示面板的像素驱动单元。
在本公开的实施例中，伽玛电压产生模块通过调节伽玛曲线基准点，产生经补偿的伽玛电压值。
根据本公开的另一方面，提供了一种显示装置，包括上述用于补偿显示面板的温度的装置。
在本公开的实施例中，用于温度检测的装置被设置在显示面板中。
根据本公开的另一方面，提供了一种使用上述用于温度检测的装置检测温度的方法，包括：向第一电压信号端输入高电平信号，向第二电压信号端输入低电平信号，并向温感晶体管的控制极输入亚阈值偏置电压，使延时模块的输出端输出随温度而变化的输出信号；对输出信号进行滤波；将经滤波的输出信号转换成温度代码；以及根据温度代码确定温度。
根据本公开的另一方面，提供了一种用于补偿显示面板的温度的方法，包括：向上述用于温度检测的装置的第一电压信号端输入高电平信号，向第二电压信号端输入低电平信号，并向温感晶体管的控制极输入亚阈值偏置电压，使延时模块的输出端输出随显示面板的温度而变化的输出信号；对输出信号进行滤波；将经滤波的输出信号转换成温度代码；以及根据温度代码，调节输出到显示面板的驱动电压。
在本公开的实施例中，用于补偿显示面板的温度的方法还包括：当温 度代码在阈值区间以外时，产生经补偿的伽玛电压值；以及根据经补偿的伽玛电压值，将相应的伽玛电压输入到显示面板的像素驱动单元。
根据上述配置，可以根据不同的温度区间对显示面板进行补偿。当温度波动不大时，可以只通过调节显示面板的驱动电压来补偿显示效果随温度的漂移，而无需进行操作更为复杂的伽玛电压调节。当温度波动较大时，可以同时调节显示面板的驱动电压以及伽玛电压，从而更好地补偿过高或过低温度下出现的显示问题。
在本公开的实施例中，通过调节伽玛曲线基准点，产生经补偿的伽玛电压值。
根据上述配置，用于温度检测的装置可以由晶体管、电阻器、电容器和反相器构成，而无需其它特殊的温度感测器件或运算放大器等，从而可以简化该装置的结构并降低成本、并可将其集成在显示面板内部的任一位置。相比于设置在显示面板外部或驱动集成模块(IC)中的温度检测模块，本公开的实施例的用于温度检测的装置可以更好地检测屏内温度的变化情况，从而使用于补偿显示面板的温度的装置更快更准确地做出反应。用于温度检测的装置可以利用薄膜晶体管(TFT)工艺实现，从而提高与显示面板的TFT阵列基板的工艺兼容性。另一方面，可以根据不同的温度区间对显示面板进行补偿。当温度波动不大时，可以只通过调节显示面板的驱动电压来补偿显示效果随温度的漂移，而无需进行操作更为复杂的伽玛电压调节。当温度波动较大时，可以同时调节显示面板的驱动电压以及伽玛电压，从而更好地补偿过高或过低温度下出现的显示问题。
附图说明
为了更清楚地说明本公开的实施例的技术方案，下面将对实施例的附图作简单地介绍。明显地，以下附图中的结构示意图不一定按比例绘制，而是以简化形式呈现各特征。而且，下面描述中的附图仅仅涉及本公开的一些实施例，而并非对本公开进行限制。
图1是根据本公开的实施例的用于温度检测的装置的示意图；
图2A、2B、2C、2D、2E和2F是根据本公开的实施例的用于温度检测的装置的示意图；
图3是图2A所示的用于温度检测的装置中输入端的信号的示意图；
图4是根据本公开的实施例的用于补偿显示面板的温度的装置的示意框图；
图5示出根据本公开的实施例的用于温度检测的装置的输出信号的波形频率和温度代码值随显示面板屏内温度变化的函数关系图；
图6是根据本公开的实施例的用于温度检测的方法的流程图；以及
图7是根据本公开的实施例的用于补偿显示面板的温度的方法的流程图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例仅是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
如前所述，本公开的实施例提供了一种用于温度检测的装置和方法、用于补偿显示面板的温度的装置和方法、以及显示装置，从而提高补偿显示面板的温度的效果。在下文中，将以相应的实施例对本公开的实施例的用于温度检测的装置和方法、用于补偿显示面板的温度的装置和方法、及显示装置进行具体说明。
图1是根据本公开的实施例的用于温度检测的装置的示意图。如图1所示，用于温度检测的装置包括：第一反相器INV1，延时模块DM，开关晶体管Tsw，第一电容器C1，以及温感晶体管Tsen。
第一反相器INV1将输入端A的电压信号反相，并输出反相信号。
延时模块DM与第一反相器INV1耦接，并被配置为使反相信号延时， 并输出被延时的反相信号，作为输出信号。
开关晶体管Tsw的控制极与输出端B耦接(换言之，与延时模块DM的输出端B耦接)，第一极与第一电压信号端(如工作电压VDD)耦接，且第二极与反相器INV1的输入端A耦接。开关晶体管Tsw根据输出信号，将工作电压VDD提供至第一反相器INV1的输入端。作为一个示例，如图1，开关晶体管Tsw为N型晶体管。
第一电容器C1的第一端与开关晶体管Tsw的第一极耦接，第二端与反相器INV1的输入端A耦接。开关晶体管Tsw和电容器C1与第一反相器INV1和延时模块DM配合，以产生周期性变化的输出信号，这将稍后参考图2进行详细描述。
温感晶体管Tsen的控制极被输入亚阈值偏置电压(其中Vsub-th表示亚阈值偏置电压)，第一极与反相器INV1的输入端A耦接，第二极与第二电压信号端(如，地电压VSS)耦接。在亚阈值偏置下，温感晶体管Tsen的沟道处于弱反型状态，沟道电流与温度成单调递增关系，且沟道电流小于正常偏置电流。温感晶体管Tsen可以采用各种现有的晶体管，并且可以是例如薄膜晶体管TFT。作为一个示例，如图1，温感晶体管Tsen为N型晶体管。
图2A-2F示出根据本公开的可选实施例的用于温度检测的装置的示意图。
如图2A所示，反相器INV2、INV3、INV4和INV5构成图1所示的延时模块DM。其它第一反相器INV1、开关晶体管Tsw、第一电容器C1和温感晶体管Tsen与图1中结构相同，不再赘述。
反相器INV1-INV5中的任何一个可以采用现有的各种反相器结构实现。作为一个示例，可以采用互补金属氧化物半导体(CMOS)反相器，其包括一个N沟道金属氧化物半导体场效应晶体管(MOSFET)和一个P沟道MOSFET。两个MOSFET的栅极耦接在一起作为该反相器的输入端，且两个MOSFET的漏极耦接在一起作为该反相器的输出端。P沟道MOSFET的源极接工作电压VDD，且N沟道MOSFET的源极接地VSS。
当第一反相器的输入端A的电压为低电平时，第一反相器的输出电压为高电平，并且反之亦然。对于四个首尾串联耦接的反相器INV2-INV5，当其输入电压为低电平时，其输出电压也为低电平，并且反之亦然。因此，并不改变输入信号的相位，而只是引入了传输延迟(其为四个反相器的传输延迟之和)。因此，四个首尾串联耦接的反相器INV2-INV5可构成延时模块DM。相应地，五个首尾串联耦接的反相器INV1-INV5可以被视为将第一反相器INV1与延时模块DM耦接。
图2B的用于温度检测的装置与图2A基本相同，区别在于延时模块DM为RC延时模块。如图2B所示，在RC延时模块中，电阻器R1的第一端与反相器INV1的输出端耦接，第一端与输出端B耦接。电容器C2的第一端与电阻器R1的第二端耦接，且电容器C2的第二端接地。可替代地，在图2C中，电容器C2的第二端与反相器INV1的输入端A耦接。电阻器R1的第二端为该RC延时模块的输出端B(即，用于温度检测的装置的输出端B)。该RC延时模块可以起到与偶数个串联耦接的反相器相似的延时作用，并且可以通过调节电阻器R1和电容器C2的值来调节输出端B的输出信号的波形的周期tper，进而调节其频率。
图2D的用于温度检测的装置与图2A基本相同，区别在于延时模块既包括偶数个串联耦接的反相器，又包括RC延时模块。如图2D所示，该延时模块至少包括：两个串联耦接的反相器INV2和INV3，电阻器R2，以及电容器C3。电阻器R2位于反相器INV2的输出端与反相器INV3的输入端之间的耦接线路中。电容器C3的第一端耦接至电阻器R2与反相器INV3的输入端的耦接点，电容器C3的第二端与反相器INV2的输入端耦接。可替代地，在图2E中，电容器C3的第二端接地。类似地，可以通过调节电阻器R2和电容器C3的值来调节用于温度检测的装置的输出端的输出信号的波形的周期tper，进而调节其频率。
在图2F中，延时模块DM还可以可选地包括电阻器R3，其位于电阻器R2与反相器INV3的输入端之间的耦接线路中。电阻器R3可以防止在反相器INV3的输入端处的电压发生跳变时流入反相器INV3的电流过大，从 而起到保护作用。
然而，本公开的实施例的用于温度检测的装置并不限于上面描述的示例。首先，延时模块并不限于如图2A所示那样仅包括四个首尾串接的反相器，而是只要包括偶数个首尾串接的反相器即可。其次，RC延时模块并不限于如图2B-2C中所示仅包括一个电阻器和一个电容器，也可以包括其他的电阻器和/或电容器从而构成各种结构的RC延时模块。此外，延时模块并不限于偶数个首尾串接的反相器或RC延时模块或其组合，而是也可以包括各种其他类型的延时模块。
此外，应注意的是，在本文中，术语“耦接”包括元件之间的直接连接和间接连接。
图3是图2A所示的用于温度检测的装置中输入端A的信号的示意图。
在时刻t0-t1，向开关晶体管Tsw的第一极输入工作电压VDD，第一反相器INV1的输入端A处的电压VA保持为低电压VL(例如，接近于0V的低电压)，开关晶体管Tsw关断，电容器C1被充电。输入端A处的低电压VL被传输到反相器INV5的输出端B(其中t0与t1之间的时间间隔对应于五个反相器INV1-INV5的延迟时间之和)。
在时刻t1-t2，输出端B处的电压为高电压VH，该高电压VH被输入到开关晶体管Tsw的控制极，使开关晶体管Tsw导通。输入端A处的电压VA被快速从低电压VL拉到高电压VH。电容器C1接近于短路状态，电容器C1放电，使两个极板上积累的电荷发生中和。
在时刻t2-t3，输入端A处的高电压VH传输到反相器INV5的输出端B(其中t2与t3之间的时间间隔对应于五个反相器INV1-INV5的延迟时间之和)，由于存在奇数个反相器，所以输出端B处的电压为低电压VL。
在时刻t3-t4，输出端B处的低电压VL被输入到开关晶体管Tsw的控制极，使开关晶体管Tsw关断。由于开关晶体管Tsw关断，所以输入端A处的高电压VH通过温感晶体管Tsen进行放电，使得输入端A处的电压VA逐渐降低到低电压VL。随着输入端A处的电压VA逐渐降低，电容器 C1两端产生电压差，使电容器C1开始被充电。
在时刻t4-t5，输入端A处保持低电压VL，并传输到反相器INV5的输出端B(其中t4与t5之间的时间间隔对应于五个反相器INV1-INV5的延迟时间之和)。
之后，相同的过程不断重复，从而产生图3中所示的振荡波形。该振荡波形的周期tper为时刻t1与t5之间的时间间隔，放电时间td为时刻t3与t4之间的时间间隔。应注意的是，图3中所示的振荡波形为输入端A处的电压波形，用于温度检测的装置的输出端B处的输出信号的波形可以通过将输入端A处的电压波形的反相来获得。
如前所述，温感晶体管Tsen在电压Vsub-th偏置下处于亚阈值状态，放电电流较小，所以时刻t3与t4之间的放电时间td较长。温感晶体管Tsen的亚阈值电流大小与温度成单调递增关系。当温度上升时，流经温感晶体管Tsen的放电电流增大，放电时间td缩短，使得温度检测模块输出的波形周期tper缩短，频率升高。当温度降低时，流经温感晶体管Tsen的放电电流减小，放电时间td增加，使得温度检测模块输出的波形周期tper变长，频率降低。在用于温度检测的装置的输出信号的波形频率与屏内温度之间建立了一一对应且成单调递增的关系，因此可以通过用于温度检测的装置的输出端B处的电压波形的频率来表示屏内的温度。
根据本公开的实施例，用于温度检测的装置可以由开关晶体管、电容器以及基本反相器构成，而无需使用运算放大器等复杂模块，因此有利于集成在TFT基板(例如，硅基微显示OLED基板)中。此外，用于温度检测的装置中的温度感应可以利用TFT器件(例如，硅基CMOS器件)处于压阈值偏置时沟道电流与温度成单调递增关系且沟道电流小于正常偏置电流的特性来实现，不需要其他特殊的温度感应器件。用于温度检测的装置可以采用TFT工艺(例如，硅基CMOS工艺)实现，与显示面板的TFT阵列基板的工艺兼容性较好。另一方面，用于温度检测的装置可以被集成在显示面板内部的任一位置。相比于设置在显示面板外部或驱动IC中的用于温度检测的装置，本公开的实施例可以更好地检测屏内温度的变 化情况，并且使用于补偿显示面板的温度的装置可以更快更准确地做出反应。
图4是根据本公开的实施例的用于补偿温度的装置的示意框图。该装置可以被配置为对显示面板(例如LCD显示面板、OLED显示面板等)进行温度补偿。如图4所示，用于补偿温度的补偿装置至少包括：温度检测模块402，滤波模块404，转换器406，以及电源管理模块408。
温度检测模块402可以采用以上所描述的用于温度检测的装置，以输出随显示面板的温度而变化的输出信号。如前所述，温度检测模块可以被集成在显示面板中的任意位置(例如，集成在液晶显示面板的阵列基板或彩膜基板上，集成在OLED显示面板的阵列基板或封装盖板上，等等)。
滤波模块404被配置为对温度检测模块402的输出信号进行滤波，以过滤掉输出信号的噪声电压。滤波模块404可以采用现有的对信号进行滤波整形的技术来实现。作为一个示例，滤波模块404可以包括CMOS缓冲器。
转换器406可以将经滤波的输出信号转换成温度代码。作为一个示例，转换器406为模数转换器。温度代码可以是例如N位的数字编码，且在数字编码的值与温度检测模块的输出信号的振荡波形的频率之间存在着一对一的单调递增关系，如图5所示。从图5可以看出，随着显示面板屏内温度的升高，振荡波形的频率和温度代码值也单调增大。利用本公开的实施例的温度检测模块402获得输出波形频率及其对应的温度代码，同时利用现有的其他类型的温度检测装置获得显示面板的温度，从而获得图5所示的函数关系。作为另一示例，温度代码也可以与温度检测模块402的振荡波形的周期成一对一的单调递增关系。由于振荡波形的频率与温度成单调递增关系，所以振荡波形的周期与温度成单调递减关系。无论温度代码与振荡波形的频率还是周期相对应，都可以用来表示温度从而进行温度补偿。
然而，本公开的实施例的用于补偿显示面板的装置的结构并不限于此，只要能够生成表示显示面板温度的温度代码即可。
电源管理模块408根据温度代码来调节输出到显示面板的驱动电压(例如ELVDD、ELVSS)，以便对显示面板进行温度补偿(例如，通过改变显示面板中像素驱动模块的电源压差，以改善面板温度漂移后产生的显示效果问题)。作为一个示例，电源管理模块408可以包括控制部和直流到直流(DC-DC)转换器。控制部可以根据温度代码，生成用于显示面板的调节后的驱动电压值。例如，可以通过实验获得温度代码与最优的显示面板驱动电压值之间的曲线。控制部可以根据该曲线和当前的温度代码来生成调节后的驱动电压值。控制部可以采用专用集成模块(ASIC)、现场可编程门阵列(FPGA)等，也可以采用处理器芯片。直流到直流转换器可以根据调节后的驱动电压值，从例如预定电压产生调节后的驱动电压，以便将其输入到显示面板。
根据本公开的实施例，用于补偿显示面板的温度的装置还可以可选地包括伽玛(Gamma)电压产生模块410和源极电压驱动模块412。
伽玛电压产生模块410被配置为当温度代码在阈值区间以外时，产生经补偿的伽玛电压值。如图5所示的曲线，温度代码(TC)的阈值区间为[Tth-,Tth+]所对应的[TCth-,TCth+]，其中Tth-和Tth+分别是无需进行伽玛电压调节的温度区间的温度下限和温度上限，TCth-和TCth+分别是所述温度下限和温度上限对应的温度代码下限和温度代码上限。该温度下限和温度上限可以通过例如以下方式确定：从正常工作温度逐渐降低温度，且在每个温度下仅执行显示面板驱动电压的补偿调节，当补偿后的显示效果与期望的显示效果刚好超过预定偏差时，该温度可以确定为Tth-。类似地，从正常工作温度逐渐升高温度，且在每个温度下仅执行显示面板驱动电压的补偿调节，当补偿后的显示效果与期望的显示效果刚好超过预定偏差时，该温度可以确定为Tth+。
作为一个示例，伽玛电压产生模块410可以通过调节伽玛曲线基准点，输出与当前温度匹配的伽玛电压曲线，从而产生经补偿的伽玛电压值。该伽玛电压产生模块410可以被实现为专用集成模块(ASIC)、现场可编程门阵列(FPGA)等，也可以被实现为处理器芯片。
源极电压驱动模块412被配置为根据经补偿的伽玛电压值，将相应的伽玛电压输入到显示面板的像素驱动单元，以便补偿显示面板的亮度和色度。源极电压驱动模块可以采用各种现有的源极驱动技术来实现。
在本公开的实施例中，可以根据不同的温度区间对显示面板进行补偿。当温度波动不大时，可以只通过调节显示面板的驱动电压来补偿显示效果随温度的漂移，而无需进行操作更为复杂的伽玛电压调节。当温度波动较大时，可以同时调节显示面板的驱动电压以及伽玛电压，从而更好地补偿过高或过低温度下出现的显示问题。也就是说，用于温度补偿装置在温度变化在一定范围内时，可以直接补偿例如ELVDD和EVLSS，以调节面板显示效果。超过一定范围之后再补偿伽玛电压曲线，并且与ELVDD和ELVSS共同对显示面板进行调节。
根据本公开的实施例的显示装置(例如LCD显示装置、OLED显示装置等)包括显示面板和用于补偿显示面板的温度的装置。
如前所述，用于温度检测的装置可以被集成在显示面板中的任意位置(例如，集成在液晶显示面板的阵列基板或彩膜基板上，集成在OLED显示面板的阵列基板或封装盖板上，等等)。由于采用了上面描述的用于补偿显示面板的温度的装置，所以该显示装置可以更快更准确地得到温度补偿，在此不再赘述。
图6是根据本公开的实施例的用于检测温度的方法的流程图，例如使用图4所示的温度检测装置402。
如图6所示，在步骤602，向第一电压信号端输入高电平信号(如工作电压)，向第二电压信号端输入低电平信号(如接地)，并向温感晶体管的控制极输入亚阈值偏置电压，使延时模块的输出端输出随温度而变化的输出信号。
在步骤604，对该输出信号的振荡波形进行滤波，这可以由图4所示的滤波模块404执行。
在步骤606，将经滤波的输出信号转换成温度代码。这可以由图4所示的转换器406执行。
在步骤608，根据所述温度代码与所述温度之间的函数关系，从温度代码确定温度。
如上所述，温度代码可以与振荡波形的频率或周期相对应。在温度代码与振荡波形的频率相对应的情况下，温度代码与温度成单调递增的函数关系。在温度代码与振荡波形的周期相对应的情况下，温度代码与温度成单调递减的函数关系。这些函数关系可以如前所述通过实验获得。
图7是根据本公开的实施例的用于补偿显示面板的温度的方法的流程图。图中的虚线框表示可选步骤。该方法可以用于对显示面板(例如LCD显示面板、OLED显示面板等)进行温度补偿。
如图7所示，在步骤702，向温度检测模块402的第一电压信号端输入高电平信号(如工作电压)，向第二电压信号端输入低电平信号(如接地)，并向温感晶体管的控制极输入亚阈值偏置电压，使延时模块的输出端输出随显示面板的温度而变化的输出信号。
在步骤704，对输出信号的振荡波形进行滤波。这可以由图4所示的滤波模块404执行。
在步骤706，将经滤波的输出信号转换成用于温度补偿的温度代码。这可以由图4所示的转换器406执行。
在步骤708，根据该温度代码，调节输出到显示面板的驱动电压。这可以由图4所示的电源管理模块408执行。
如上所述，本公开的实施例的用于补偿显示面板的温度的方法可以可选地包括步骤710和712。
在步骤710，当温度代码在阈值区间以外时，产生经补偿的伽玛电压值。例如，在获得温度代码之后，可以确定该温度代码是否在阈值区间以外。当确定温度代码在阈值区间以外时，可以产生经补偿的伽玛电压值。如前所述，进一步，可以通过调节伽玛曲线基准点，来产生经补偿的伽玛电压值。步骤710可以由图4所示的伽玛电压产生模块410执行。
在步骤712，可以根据经补偿的伽玛电压值，将相应的伽玛电压输入到显示面板的像素驱动单元。这可以由图4所示的源极电压驱动模块412 执行。由此，显示效果随温度的漂移可以通过补偿后的显示面板电源电压与补偿后的伽玛电压曲线共同调节，从而改善由于显示面板温度变化引起的显示问题。
上述步骤702-712的细节已经在上面进行了详细描述，在此不再赘述。
应注意的是，以上所述仅是本公开的示范性实施方式，而并非用于限制本公开的保护范围，本公开的保护范围由所附的权利要求确定。

Claims (17)

  1. 一种用于温度检测的装置，包括：
    第一反相器，其被配置为将输入端的电压信号反相，以输出反相信号；
    延时模块，其与所述第一反相器耦接，并被配置为使所述反相信号延时，并输出被延时的反相信号，作为输出信号；
    开关晶体管，其控制极与所述延时模块耦接，第一极与第一电压信号端耦接，第二极与所述第一反相器的输入端耦接，并被配置为根据所述输出信号，将来自所述第一电压信号端的第一电压信号提供至所述第一反相器的输入端；
    第一电容器，其第一端与所述开关晶体管的第一极耦接，第二端与所述第一反相器的输入端耦接；以及
    温感晶体管，其控制极被输入亚阈值偏置电压，第一极与所述第一反相器的输入端耦接，第二极与第二电压信号端耦接，并被配置为在所述亚阈值偏置电压下，所述温感晶体管的沟道电流与温度成正比。
  2. 根据权利要求1所述的温度检测模块，其中，所述延时模块包括偶数个串联耦接的反相器。
  3. 根据权利要求1所述的温度检测模块，其中，所述延时模块包括：
    第一电阻器，其第一端与所述第一反相器的输出端耦接，第二端为所述延时模块的输出端；以及
    第二电容器，其第一端与所述第一电阻器的第二端耦接，第二端与所述第二电压信号端耦接。
  4. 根据权利要求1所述的温度检测模块，其中，所述延时模块包括：
    第一电阻器，其第一端与所述第一反相器的输出端耦接，第二端为所述延时模块的输出端；以及
    第二电容器，其第一端与所述第一电阻器的第二端耦接，第二端与所述第一反相器的输入端耦接。
  5. 根据权利要求2所述的温度检测模块，其中，所述偶数个串联耦接 的反相器包括相邻的第二反相器和第三反相器，
    所述延时模块还包括：
    第二电阻器，其第一端与所述第二反相器的输出端耦接，第二端与所述第三反相器的输入端耦接；以及
    第三电容器，其第一端与所述第二电阻器的第二端耦接，第二端与所述第二电压信号端耦接。
  6. 根据权利要求2所述的温度检测模块，其中，所述偶数个串联耦接的反相器包括相邻的第二反相器和第三反相器，
    所述延时模块还包括：
    第二电阻器，其第一端与所述第二反相器的输出端耦接，第二端与所述第三反相器的输入端耦接；以及
    第三电容器，其第一端与所述第二电阻器的第二端耦接，第二端与所述第二反相器的输入端耦接。
  7. 根据权利要求5或6所述的温度检测模块，其中，所述延时模块还包括：
    第三电阻器，其第一端与所述第二电阻器的第二端耦接，第二端与所述第三反相器的输入端耦接。
  8. 根据权利要求1所述的温度检测模块，其中，所述温感晶体管为薄膜晶体管。
  9. 一种用于补偿显示面板的温度的装置，包括：
    根据权利要求1-8中任一项所述的用于温度检测的装置；
    滤波模块，其被配置为对所述用于温度检测的装置的输出信号进行滤波；
    转换器，其被配置为将经滤波的输出信号转换成温度代码；以及
    电源管理模块，其被配置为根据所述温度代码，调节输出到所述显示面板的驱动电压。
  10. 根据权利要求9所述的装置，还包括：
    伽玛电压产生模块，其被配置为当所述温度代码在阈值区间以外时， 产生经补偿的伽玛电压值；以及
    源极电压驱动模块，其被配置为根据经补偿的伽玛电压值，将相应的伽玛电压输入到所述显示面板的像素驱动单元。
  11. 根据权利要求10所述的装置，其中，所述伽玛电压产生模块通过调节伽玛曲线基准点，产生所述经补偿的伽玛电压值。
  12. 一种显示装置，包括：
    显示面板；以及
    根据权利要求9-11中任一项所述的用于补偿显示面板的温度的装置。
  13. 根据权利要求12所述的显示装置，其中，所述用于温度检测的装置被设置在所述显示面板中。
  14. 一种使用如权利要求1至8任一项所述的用于温度检测的装置检测温度的方法，包括：
    向第一电压信号端输入高电平信号，向第二电压信号端输入低电平信号，并向温感晶体管的控制极输入亚阈值偏置电压，使延时模块的输出端输出随温度而变化的输出信号；
    对所述输出信号进行滤波；
    将经滤波的输出信号转换成温度代码；以及
    根据所述温度代码确定温度。
  15. 一种用于补偿显示面板的温度的方法，包括：
    向根据权利要求1-8中任一项所述的用于温度检测的装置的第一电压信号端输入高电平信号，向第二电压信号端输入低电平信号，并向温感晶体管的控制极输入亚阈值偏置电压，使延时模块的输出端输出随所述显示面板的温度而变化的输出信号；
    对所述输出信号进行滤波；
    将经滤波的输出信号转换成温度代码；以及
    根据所述温度代码，调节输出到所述显示面板的驱动电压。
  16. 根据权利要求15所述的方法，还包括：
    当所述温度代码在阈值区间以外时，产生经补偿的伽玛电压值；以及
    根据经补偿的伽玛电压值，将相应的伽玛电压输入到所述显示面板的像素驱动单元。
  17. 根据权利要求16所述的方法，其中，通过调节伽玛曲线基准点，产生所述经补偿的伽玛电压值。
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