TWI383367B - Display driving circuit - Google Patents
Display driving circuit Download PDFInfo
- Publication number
- TWI383367B TWI383367B TW97122107A TW97122107A TWI383367B TW I383367 B TWI383367 B TW I383367B TW 97122107 A TW97122107 A TW 97122107A TW 97122107 A TW97122107 A TW 97122107A TW I383367 B TWI383367 B TW I383367B
- Authority
- TW
- Taiwan
- Prior art keywords
- circuit
- operational amplifier
- display driving
- current
- temperature compensation
- Prior art date
Links
- 230000007423 decrease Effects 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Description
本發明涉及一種顯示器驅動電路。 The present invention relates to a display driving circuit.
目前，液晶顯示器主要包括一液晶顯示單元及一用於向液晶顯示單元提供均勻面光源之背光模塊。背光模塊之發光單元大多採用冷陰極螢光燈管，冷陰極螢光燈管因存在放電效應於發光前會呈現高阻抗，需要驅動電路提供一高電壓才能發光。環境之改變對燈管之特性有一定之影響，溫度高時，燈管之工作電流大，反之，燈管電流小。若溫度過高，燈管會因電流過大而被燒壞。習知之顯示器驅動電路不能根據環境之影響及時地調整燈管電流之大小，導致燈管使用壽命縮短。 At present, a liquid crystal display mainly includes a liquid crystal display unit and a backlight module for providing a uniform surface light source to the liquid crystal display unit. Most of the light-emitting units of the backlight module use a cold cathode fluorescent lamp. The cold cathode fluorescent lamp has a high impedance before the light is emitted due to the discharge effect, and the driving circuit is required to provide a high voltage to emit light. The change of the environment has a certain influence on the characteristics of the lamp. When the temperature is high, the working current of the lamp is large, and vice versa, the lamp current is small. If the temperature is too high, the lamp will be burned out due to excessive current. The conventional display driver circuit cannot adjust the lamp current in time according to the influence of the environment, resulting in shortened lamp life.
鑒於以上內容，有必要提供一種能隨環境變化調節輸出電流值之顯示器驅動電路。 In view of the above, it is necessary to provide a display driving circuit capable of adjusting the output current value with environmental changes.
一種顯示器驅動電路，其包括一溫度補償調整電路、一控制電路、一全橋式電路及一變壓電路，該溫度補償調整電路為該控制電路提供一隨環境改變而變化之電流訊號，該控制電路根據該電流訊號控制該全橋式電路，該全橋式電路輸出至該變壓電路之電壓訊號隨該電流訊號之增減而減增，該變壓電路將該電壓訊號升壓放大後驅動顯示器之發光單元。 A display driving circuit includes a temperature compensation adjustment circuit, a control circuit, a full bridge circuit and a transformer circuit, and the temperature compensation adjustment circuit provides the control circuit with a current signal that changes according to environmental changes, and the control The circuit controls the full-bridge circuit according to the current signal, and the voltage signal outputted to the transformer circuit by the full-bridge circuit is increased and decreased with the increase and decrease of the current signal, and the voltage conversion circuit boosts and drives the voltage signal to drive The light unit of the display.
該顯示器驅動電路透過該溫度補償調整電路為該控制電路提供一隨環境改變而變化之電流訊號，該控制電路透 過該電流訊號調控該全橋式電路之輸出電壓，進而透過該變壓電路改變發光燈管之工作電流，延長發光單元之使用壽命。 The display driving circuit provides a current signal for the control circuit to change according to the environment through the temperature compensation adjustment circuit, and the control circuit is transparent The current signal regulates the output voltage of the full-bridge circuit, and further changes the operating current of the light-emitting tube through the transformer circuit to extend the service life of the light-emitting unit.
請參考圖1，本發明顯示器驅動電路用於驅動顯示器之一發光單元150，其較佳實施方式包括一溫度補償調整電路110、一控制電路120、一全橋式電路130及一變壓電路140。 Referring to FIG. 1 , the display driving circuit of the present invention is used to drive one of the display units 150 . The preferred embodiment includes a temperature compensation adjustment circuit 110 , a control circuit 120 , a full bridge circuit 130 , and a transformer circuit 140 . .
該溫度補償調整電路110包括一運算放大電路10、兩電阻R1、R2及一溫度補償裝置20，該運算放大電路10之正相輸入端1作為該溫度補償調整電路110之輸入端連接該全橋式電路130之輸入端，該運算放大電路10之反相輸入端2透過該電阻R2接地，該電阻R1之兩端分別連接該運算放大電路10之反相輸入端2及輸出端3，該運算放大電路10之輸出端3與該溫度補償裝置20之一端相連，該溫度補償裝置20之另一端作為該溫度補償調整電路110之輸出端連接該控制電路120。本實施方式中，該溫度補償裝置20採用一負熱敏電阻，外界溫度升高時，其阻值減小，該溫度補償調整電路110之輸出電流增大，反之，其阻值增大，該溫度補償調整電路110之輸出電流減小。該溫度補償調整電路110為該控制電路120提供一隨外界溫度升高而增大之電流訊號At。其他實施方式中，該溫度補償裝置20亦可採用一正熱敏電阻與一常規電阻並聯，實現與負熱敏電阻相同之功能。需要說明的是，該溫度補償調整電路110透過該溫度補償裝置20即可實現溫度補償功能， 增加該運算放大電路10、該電阻R1及R2能使本實施方式顯示器驅動電路之性能更穩定。 The temperature compensation adjustment circuit 110 includes an operational amplifier circuit 10, two resistors R1 and R2, and a temperature compensation device 20. The positive phase input terminal 1 of the operational amplifier circuit 10 is connected to the full bridge as an input terminal of the temperature compensation adjustment circuit 110. The inverting input terminal 2 of the operational amplifier circuit 10 is grounded through the resistor R2, and the two ends of the resistor R1 are respectively connected to the inverting input terminal 2 and the output terminal 3 of the operational amplifier circuit 10, and the operation is performed. The output end 3 of the amplifying circuit 10 is connected to one end of the temperature compensating device 20, and the other end of the temperature compensating device 20 is connected to the control circuit 120 as an output end of the temperature compensating adjusting circuit 110. In this embodiment, the temperature compensation device 20 uses a negative thermistor. When the external temperature rises, the resistance value decreases, and the output current of the temperature compensation adjustment circuit 110 increases. Otherwise, the resistance increases. The output current of the temperature compensation adjustment circuit 110 is reduced. The temperature compensation adjustment circuit 110 provides the control circuit 120 with a current signal At that increases as the ambient temperature increases. In other embodiments, the temperature compensation device 20 can also use a positive thermistor in parallel with a conventional resistor to achieve the same function as the negative thermistor. It should be noted that the temperature compensation adjustment circuit 110 can realize the temperature compensation function through the temperature compensation device 20, Increasing the operational amplifier circuit 10 and the resistors R1 and R2 can make the performance of the display drive circuit of the present embodiment more stable.
該控制電路120透過該電流訊號At控制該全橋式電路130，該電流訊號At增大時，該全橋式電路130為該變壓電路140提供之電壓減小，反之，提供之電壓增大。該變壓電路140將該全橋式電路130之輸出電壓放大後驅動該發光單元150。一般而言，該發光單元150之工作電流會隨溫度升高而加大。故，本發明顯示器驅動電路能根據環境之變化調整該發光單元150之工作電流，延長其使用壽命。 The control circuit 120 controls the full-bridge circuit 130 through the current signal At. When the current signal At increases, the voltage provided by the full-bridge circuit 130 for the transformer circuit 140 decreases, and vice versa. . The transformer circuit 140 amplifies the output voltage of the full bridge circuit 130 to drive the light emitting unit 150. In general, the operating current of the light-emitting unit 150 increases as the temperature increases. Therefore, the display driving circuit of the present invention can adjust the operating current of the light emitting unit 150 according to changes in the environment and prolong its service life.
需要指出的是，該溫度補償調整電路110可以於顯示器驅動電路中任何位置獲取電流。本實施方式中該溫度補償調整電路110之輸入端連接至該全橋式電路130之輸入端只係其中一種方式。如，該溫度補償調整電路110之輸入端還可連接至該全橋式電路130與該變壓電路140之輸出端。 It should be noted that the temperature compensation adjustment circuit 110 can acquire current at any position in the display drive circuit. In the embodiment, the input end of the temperature compensation adjustment circuit 110 is connected to the input end of the full bridge circuit 130 only in one manner. For example, the input end of the temperature compensation adjustment circuit 110 can also be connected to the output ends of the full bridge circuit 130 and the transformer circuit 140.
該顯示器驅動電路透過該溫度補償調整電路為該控制電路提供一隨環境溫度升高而增大之電流訊號，該控制電路透過該電流訊號調控該全橋式電路之輸出電壓，進而透過該變壓電路調控顯示器中發光單元之工作電流，延長發光單元之使用壽命。 The display driving circuit provides the control circuit with a current signal that increases with an increase in ambient temperature through the temperature compensation adjustment circuit, and the control circuit controls the output voltage of the full bridge circuit through the current signal, and further transmits the voltage through the voltage The circuit regulates the operating current of the light-emitting unit in the display and prolongs the service life of the light-emitting unit.
綜上所述，本發明符合發明專利要件，爰依法提出專利申請。惟，以上所述者僅為本發明之較佳實施方式，舉凡熟悉本案技藝之人士，於爰依本發明精神所作之等效 修飾或變化，皆應涵蓋於以下之申請專利範圍內。 In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, and those skilled in the art will be equivalent to the spirit of the present invention. Modifications or variations are intended to be included within the scope of the claims below.
110‧‧‧溫度補償調整電路 110‧‧‧ Temperature compensation adjustment circuit
120‧‧‧控制電路 120‧‧‧Control circuit
130‧‧‧全橋式電路 130‧‧‧Full bridge circuit
140‧‧‧變壓電路 140‧‧‧Transformer circuit
150‧‧‧發光單元 150‧‧‧Lighting unit
10‧‧‧運算放大電路 10‧‧‧Operation Amplifier Circuit
20‧‧‧溫度補償裝置 20‧‧‧ Temperature compensation device
R1、R2‧‧‧電阻 R1, R2‧‧‧ resistance
At‧‧‧電流訊號 At‧‧‧current signal
圖1係本發明顯示器驅動電路之較佳實施方式之電路原理圖。 1 is a circuit schematic diagram of a preferred embodiment of a display driver circuit of the present invention.
110‧‧‧溫度補償調整電路 110‧‧‧ Temperature compensation adjustment circuit
120‧‧‧控制電路 120‧‧‧Control circuit
130‧‧‧全橋式電路 130‧‧‧Full bridge circuit
140‧‧‧變壓電路 140‧‧‧Transformer circuit
150‧‧‧發光單元 150‧‧‧Lighting unit
10‧‧‧運算放大電路 10‧‧‧Operation Amplifier Circuit
20‧‧‧溫度補償裝置 20‧‧‧ Temperature compensation device
R1、R2‧‧‧電阻 R1, R2‧‧‧ resistance
At‧‧‧電流訊號 At‧‧‧current signal
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW97122107A TWI383367B (en) | 2008-06-13 | 2008-06-13 | Display driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW97122107A TWI383367B (en) | 2008-06-13 | 2008-06-13 | Display driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW200951929A TW200951929A (en) | 2009-12-16 |
| TWI383367B true TWI383367B (en) | 2013-01-21 |
Family
ID=44871916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW97122107A TWI383367B (en) | 2008-06-13 | 2008-06-13 | Display driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWI383367B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW478240B (en) * | 1999-07-22 | 2002-03-01 | O2Micro Inc | High-efficiency adaptive DC/AC converter |
| TW200524481A (en) * | 2003-12-16 | 2005-07-16 | Microsemi Corp | Current-mode driver |
| TW200604676A (en) * | 2004-07-22 | 2006-02-01 | Samsung Electronics Co Ltd | Display device and driving device for a light source |
-
2008
- 2008-06-13 TW TW97122107A patent/TWI383367B/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW478240B (en) * | 1999-07-22 | 2002-03-01 | O2Micro Inc | High-efficiency adaptive DC/AC converter |
| TW200524481A (en) * | 2003-12-16 | 2005-07-16 | Microsemi Corp | Current-mode driver |
| TW200604676A (en) * | 2004-07-22 | 2006-02-01 | Samsung Electronics Co Ltd | Display device and driving device for a light source |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200951929A (en) | 2009-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101902855B (en) | LED drive circuit and backlight module | |
| JP3685134B2 (en) | Backlight control device for liquid crystal display and liquid crystal display | |
| JP4801159B2 (en) | Light source driving circuit, light source component including the light source driving circuit, and display device | |
| CN101377902A (en) | LED backlight module unit and temperature control method thereof | |
| JP2006039558A (en) | Light source driving device and display device | |
| CN101599252A (en) | Display driver circuit | |
| CN101893185A (en) | LED Street Light | |
| CN115101018A (en) | A backlight drive control method, device, storage medium and vehicle-mounted device | |
| TWI383367B (en) | Display driving circuit | |
| TWI394126B (en) | Driving circuit for led backlight system | |
| US20120229047A1 (en) | Backlight module, over-temperature protection circuit and over-temperature protection method thereof | |
| JP2008251339A (en) | Fluorescent tube driving method, and its device | |
| CN104602393A (en) | Light emitting diode driver | |
| CN202587510U (en) | Intelligent light source and illumination measuring device | |
| TWI268124B (en) | An apparatus for driving cold-cathode fluorescent lamp | |
| CN101355839A (en) | Light-emitting device and correction and control method thereof | |
| CN101452677B (en) | Driving device, backlight module and driving method | |
| CN103281837A (en) | Light adjusting circuit applied to LED lighting lamp | |
| TW200844937A (en) | Display system | |
| KR101748660B1 (en) | Apparatus for controlling light emitting diode module equipped with function of light compensation and system comprising thereof | |
| CN210781465U (en) | A non-isolated flyback LED constant current source based on current mirror | |
| CN203261528U (en) | Infrared LED lamp dimming circuit of video camera | |
| CN102455576A (en) | projection device | |
| KR101107416B1 (en) | LED drive device | |
| KR101228922B1 (en) | Signal operational amplification circuit for LED luminance compensation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Annulment or lapse of patent due to non-payment of fees |