WO2007003108A1 - A touch control plat display device - Google Patents

Abstract

A touch control plat display device includes a display screen, a display drive circuit, and a touch control signal circuit. The display drive circuit and the display screen electrode are connected with multi-position analog switch set. The touch control signal circuit and the display electrodes are connected with multi-position analog switch set. The analog switch makes the display electrodes either connect to display drive circuit to transmit display drive signal or connect to the touch control signal circuit to directly measure and transmit the touch control signal. The display driving and the touch control measuring time division multiplex the display screen electrodes. The display screen electrodes can not only be used to display driving but also be used to touch control measuring.

Description

 Touch panel display technology

 The present invention relates to a touch screen and a flat panel display, and in particular to a touch panel display.

Background technique

 At present, the flat panel display with touch function is composed of a display screen, a display driver, a touch screen, a touch signal detector, a backlight, and the like. The touch screen has a resistive, capacitive, electromagnetic type using different sensing principles. Ultrasonic and photoelectric, etc., the display has TN/STN liquid crystal display, TFT liquid crystal display, 0LED display, PDP display, carbon nanotube display and so on. A flat panel display with a touch screen laminates the split touch screen with the display screen, detects the planar position of the touch point through the display screen, and causes the cursor on the display screen to follow the touch point. The cascading of the touch screen and the display screen makes the touch panel display thicker and heavier and the cost increases; when the touch screen is placed in front of the display screen, the reflection generated by the touch screen sensing electrode causes the display to be uneven and strong. The contrast is reduced in the external light environment, which affects the display effect. Integrating the touchpad and the display to make the flat panel display with touch function lighter and thinner is the direction of people's efforts.

The integration of the display screen and the touchpad is mainly cascading and inlaid. The cascading is to place the touchpad before or after the top surface of the display screen, and the display screen and the touch panel respectively bear the display and touch. Control tasks, Chinese patent (CN20010141451, MINXIANG INDUSTRY CO LTD, 2001), Finnish patent (FI19960002692, NOKIA MOBILE PHONES LTD, 1996), Japanese patent (JP19850161986, CANON KK, 1985), (JP19900095167, NIPPON TELEGRAPH & TELEPHONE, 1990) (JP19930306286, PFU LTD, 1993), (JP19980014850, NISSHA PRINTING, 1998), (JP19990142260, MIMAKI DENSHI BUHIN KK, 1999), Korean patent (KR20000084115, YU HWAN SE0NG; LIM J00-S00, 2000), (KR20020083301, BANG Y0NG IK; etc. , 2002), Taiwan patent (!¥556141, AU OPTRONICS CORP, 2002), US patent (US6215476, APPLE COMPUTER, 2001), (US20030347603, T0PP0LY OPTOELECTRONICS CORP, 2003) and many other patents, J3⁄4 has a variety of cascading solutions for resistive, capacitive, electromagnetic touchpads and displays, but the touchpad is placed before the top surface of the display. It will affect the display brightness, contrast, sharpness, color, etc.; after the electromagnetic touch panel is placed on the bottom of the display, it is difficult to align the touchpad electrode with the display electrode, which will also affect the brightness of the display; The method of cascading also increases the overall thickness of the display; the complexity of the structure leads to a decrease in reliability, and From the complexity of the production process and the complexity of the assembly to the high cost.

 The mosaic method is to embed the touch sensor in the display screen, and a sensor (mostly an optical sensor) is disposed beside each display pixel, and the display pixel and the sensor are connected by a double electrode, and the display driving signal and the touch detection signal are respectively transmitted. Korean patent (KR20030019631, JUNG YONG CHAE; YANG DONG KYU, 2003), (KR20030077574, CHOI J00N-H00; J00 IN-S00, 2003), German patent (GB0304587. 9, SHARP, 2003), US patent (US19970955388, SONY ELECTRONICS INC, 1997), (US19980135959, IBM, 1998), (US20030721129, EASTMAN KODAK CO, 2003) and other patents, also proposed a mosaic scheme, but the touch sensor is embedded in the display screen and double electrode The manufacturing process is complicated, the electrode lead-out line is difficult, and thus the cost is high, and mutual interference of the display driving signal and the touch detection signal may also occur.

 Some people have tried to detect touch by detecting the capacitance of the LCD screen. For example, Taiwan patent (TW20020116058, LEE YU-TUAN, 2002), the change of capacitance between the boxes is caused by the change of the thickness of the box caused by the touch pressure. The support between the boxes makes it necessary to change the thickness of the liquid crystal display, and changing the thickness of the liquid crystal display must affect the display. The dielectric anisotropy of the liquid crystal causes the capacitance between the boxes to change with the display. Excluding the change in the capacitance between the cells caused by the dielectric anisotropy of the liquid crystal material will affect the display, so this method of detecting the capacitance of the liquid crystal display to detect the touch is not preferable.

 Find a solution to solve the above-mentioned complicated structure, difficult manufacturing process, complicated production process and complicated assembly problems, improve reliability, improve display effect, compress thickness, reduce cost, and realize touch function of flat panel display in a simple way. necessary.

The capacitive touch screen uses the coupling capacitance formed between the touch object and the sensing electrode of the touch screen to detect the leakage current through the coupling capacitor to locate the touch point. The capacitive touch screen can be divided into digital and analog modes. . The digital capacitive touch screen is composed of two layers of electrodes each having a plurality of parallel electrodes. The two layers of electrodes are orthogonal to each other. When a human finger touches the touch screen, the fingers are coupled with some electrodes on the touch screen. The capacitance, and the leakage current flowing from the coupling capacitor, determine the touch position by detecting two electrodes on the two electrodes that are orthogonal to each other and form a coupling capacitance with the finger. This method is only suitable for thicker positioning. When careful positioning is required, it is necessary to make a double-layered fine electrode, which is too expensive. The analog capacitive touch screen can be divided into a single layer sensing electrode and a double layer sensing electrode. The analog capacitive touch screen of the single layer sensing electrode is composed of a single layer electrode of the entire surface, from a single layer electrode. The four corners of the electrode input current, when the human finger touches the touch screen, the hand Refers to the leakage current that forms a coupling capacitance with the electrode and flows out from the coupling capacitor. By detecting the magnitude of the current flowing to the electrode at each of the four corners, the touch position of the current flowing from the finger is calculated. This method can be meticulously positioned, but the calculation amount of the control circuit is large. When the ambient temperature and humidity change, the environmental electric field changes, causing drift, resulting in inaccurate positioning; the analog capacitive touch screen of the double-layer sensing electrode It is composed of two layers of electrodes with multiple parallel electrodes on each layer. The two layers of electrodes are orthogonal to each other. When a human finger touches the touch screen, the finger forms a coupling capacitance with some electrodes on the touch screen, and the coupling capacitor is coupled. The leakage current flowing out is calculated by detecting the magnitude of the current flowing out of each electrode, and calculating the lateral or vertical touch position on the two mutually orthogonal electrodes. This method can be meticulously positioned, and the drift problem is also improved. However, the double-layer sensing electrodes need to detect leakage current one by one, and the detection and calculation amount is large, and the time required for detection and calculation also increases as the screen becomes larger and the sensing electrodes increase.

Summary of the invention

 The invention aims to provide a touch panel display, which not only has a display function but also has a touch function, and is versatile.

The technical idea of the present invention is: a conventional dot matrix flat panel display having vertical intersecting transmission line display electrode lines for driving scanning signals and column electrode lines for transmitting display data signals, such as passives such as TN-LCD and STN-LCD In the flat panel display, the pixel and the electrode share a conductive film at the position of the display pixel; in an active flat panel display such as a TFT-LCD, the display pixel is connected to the scan electrode and the data electrode through the input port. The time-division method is used to multiplex the display electrodes, and the touch screen and the display screen are integrated into one body from the time dimension, so that the display electrode leaves the display driving state in a short time and enters the touch detection state, and then returns to the display driving state, so that The electrodes are in a display driving state or in a touch detection state at different time periods. When the electrode enters the display driving state, the display electrode transmits a display driving signal; when the electrode enters the touch detecting state, electromagnetic coupling occurs between the display electrode and the external touch object (finger or stylus), and the touch object is Just touching or even touching the display without touching the display screen, the positioning information is obtained by the electromagnetic signal coupling between the display electrode and the touch object, instead of detecting the change of the physical quantity in the display box caused by the pressure. . In this way, the display electrode is used to transmit the display driving signal or to sense and transmit the touch signal during different time periods, and the display driving signal and the touch signal are time-division multiplexed display electrodes, without adding extra in the display screen. In the case of electrodes and sensing elements, the display electrodes are capable of sensing the touch, so that the display not only has a display function but also has a touch function, and is versatile. The solution for accessing from the display end of the invention is: connecting the row and column electrodes of the display screen to the display driving circuit and the touch signal circuit through the multi-bit analog switch group, the analog switch is composed of components having switching characteristics, and the analog switch is controlled. The group switches between the display driving circuit and the touch signal circuit to connect the display electrode to the display driving circuit or to the touch signal circuit. When the display electrode is connected to the display driving circuit, the display driving circuit outputs a display driving signal to the display electrode; when the display electrode is turned to connect the touch signal circuit, the touch signal circuit outputs or detects the touch signal to the display electrode; The feature signal for touch recognition is embedded in the display driving signal, and the signal with the touch recognition feature is synthesized and output to the display electrode in time series to provide signals for both display pixel driving and touch detection. . When a touch object such as a finger or a stylus is close to a certain display electrode, a coupling capacitor is generated between the touch object and the display electrode, and the touch object and the display electrode are electromagnetically coupled through the coupling capacitor, and the simulation of connecting the electrode is performed. When the switch is turned to connect the touch signal circuit, the touch signal circuit leaks the touch signal from the strip electrode to the touch object, or receives the touch signal emitted by the touch object from the strip electrode, and detects the touch signal by using the strip electrode The touch positioning electrode determines the touch positioning point by two intersecting touch positioning electrodes. When the touch signal is detected at a plurality of electrode positions, the electrode with the largest signal is used as the touch positioning point, or the middle position of the electrode detecting the touch signal is the touch positioning point.

Another solution for accessing from the driving source is that the display driving circuit of the flat panel display can be divided into three parts: a driving source circuit, a selection and output circuit, and a control circuit. The driving source circuit generates a driving level to provide driving energy (drive source). The circuit is sometimes composed only of a power supply and a voltage dividing resistor. The selection and output circuits are selected and outputted by a register and an analog switch. The control circuit issues display information to control selection and output circuit selection and output of the drive signal. An analog switch group is added between the driving source circuit and the selection and output circuit, so that the selection and output circuits are connected to the display driving source circuit and the touch signal circuit through the analog switch group, and the analog switch is composed of components having switching characteristics, and the control simulation is performed. The switch group switches between the display drive source circuit and the touch signal circuit to connect the selection and output circuit to the display drive source circuit or to the touch signal circuit. When the selection and output circuit are connected to the display driving source circuit, the display driving signal is output to the display electrode; when the selection and output circuit is steered to the touch signal circuit, the display electrode is output or detected; the equivalent is to be used for touching The characteristic signal of the control recognition is embedded in the display driving signal, and the signal with the touch recognition feature is synthesized and output to the display electrode in time series to provide a signal for both the display pixel driving and the touch detection. When a touch object such as a finger or a stylus is close to a certain display electrode, a coupling capacitor is generated between the touch object and the display electrode, and the touch object and the display electrode are electromagnetically coupled through the coupling capacitor, and the selection and output circuits are turned. When the touch signal circuit is connected, the touch signal circuit leaks the touch signal from the strip electrode to the touch object, or receives the touch signal emitted by the touch object from the strip electrode, and detects the touch signal by using the strip electrode as the touch The positioning electrode determines the touch positioning point by two intersecting touch positioning electrodes. When the touch signal is detected at a plurality of electrode positions, the electrode with the largest signal is used as the touch positioning point, or the middle position of the electrode detecting the touch signal is the touch positioning point.

 A touch signal generating circuit can be disposed in the touch signal circuit, and a coupling signal with the touch object is emitted through the signal selection and output circuit and the display electrode; the touch signal receiving circuit can also be set, through the signal selection and output circuit and display The screen electrode receives the coupling signal with the touch object; the touch signal detecting circuit can also be set to detect the emitted touch signal or detect the received touch signal; but at least the touch signal generating circuit, the touch signal receiving circuit and the touch One of the control signal detection circuits. The special touch control circuit can be set; the display control circuit and the touch control circuit can be carried by the same circuit, and the control circuit has the display control program and the touch control program at the same time; The CPU) assumes display control and touch control, or assumes at least one of display control and touch control. The touch signal may be a flow signal, may be an amplitude signal, may be a pulse width signal, may be a frequency signal, may be a phase signal, or may be an encoded signal.

 The analog switch sets in the above two solutions are in multiple ways:

 As shown in FIG. 1, the multi-bit analog switch group can be a single-pole double-throw analog switch group 110. In the display end scheme, one end of each single-pole double-throw analog switch in the switch group is fixedly connected to one electrode of the display screen 120, and the other ends are connected to the display driving circuit 130 and the connection touch signal circuit 140, and the control end of the analog switch is connected. The display touch switching control circuit 150 is configured to cause the switch to switch the electrodes of the display screen 120 between the connected display driving circuit 130 and the connected touch signal circuit 140, as shown in FIG. 1; in the driving source end scheme One end of each single-pole double-throw analog switch in the switch group 110 is fixedly connected to one input port of the selection and output circuit 132 of the display driving circuit 130, and the other ends are connected to the driving source circuit 131 and the connection touch signal in the display driving circuit 130. The circuit 140, the control end of the analog switch is connected to the display touch switching control circuit 150, the selection of the display driving circuit 130 and the output port of the output circuit 132 are connected to the electrodes of the display screen 120, and the display touch switching control circuit 150 allows the switch to select and output The input port of the circuit 132 is connected to the driving source circuit 131 and the connected touch signal circuit 140. Switching lb. FIG.

As shown in FIG. 2, the multi-bit analog switch group can also be a single-pole single-throw analog switch group 210. In the display end scheme, one electrode of the display screen 220 is connected to the display driving circuit 230 through a single-pole single-throw analog switch, through another The single-pole single-throw analog switch is connected to the touch signal circuit 240, and the control end of the analog switch is connected to the display touch switching control circuit 250. The display touch switching control circuit 250 allows two single-pole single-throw analog switches connected to the same display electrode to be different. Connecting, as shown in FIG. 2a; in the driving source end scheme, an input port of the selection driving circuit 230 and an input port of the output circuit 232 are connected to the driving source circuit 231 through a single-pole single-throw analog switch of the analog switch group 210, through the analog switch group Another single-pole single-throw analog switch of 210 is connected to the touch signal circuit 240, and the control terminal of the analog switch is connected to display the touch switch control circuit 250. The selection of the display drive circuit 230 and the output port of the output circuit 232 are connected to the display 220. The electrode, display touch switching control circuit 250 allows two single-pole single-throw analog switches connected to the same display electrode to be connected at different times, as shown in Fig. 2b. '

 The multi-bit analog switch group can also be composed of multiple analog switch subgroups, and different analog switch subgroups control different electrodes of the display screen. The partial analog switch group can be a single-pole double-throw analog switch group, and the partial analog switch sub-group is a single-pole single-throw analog switch group.

 There are several solutions for the signal coupling between the display electrode and the touch object: One solution is that the touch signal circuit outputs an AC touch signal to the display row and column electrodes, when the touch object such as a human hand or a stylus is close to A certain set of display electrodes, a coupling capacitor is generated between the touch object and the display electrode, and the touch signal transmitted on the electrode is leaked out through the coupling capacitor portion, and the leaked touch signal is detected by the detection circuit in the touch signal circuit. The set of electrodes is a 3⁄4 touch positioning electrode.

 In another solution, the touch signal circuit group outputs a group AC touch signal to the display row electrode, and receives the touch signal by another row electrode, when a touch object such as a human hand or a stylus approaches a certain group of display electrodes. a coupling capacitor is generated between the touch object and the display electrode, and the touch signal transmitted on the output touch signal electrode is leaked out through the coupling capacitor portion, and the touch signal received by the row and column electrodes receiving the touch signal is changed. The detecting circuit connected to the row and column electrodes receiving the touch signal detects the change of the touch signal, and the set of electrodes is the touch positioning electrode.

 In another solution, the touch signal circuit outputs an AC touch signal to the display row and column electrodes. When the stylus with the signal receiving function is close to a certain set of display electrodes, the touch signal is detected by the proximity stylus. And using the set of electrodes as a touch positioning electrode.

In another solution, the display row and column electrodes are connected to the touch signal circuit having the signal receiving function. When the stylus with the touch signal transmitting function is close to a certain set of display electrodes, the touch signal is touched through the display electrode. Control signal The circuit detects and uses the set of electrodes as a touch positioning electrode.

 In another solution, the display electrode is connected to the touch signal circuit through a plurality of analog switches, and the touch signal circuit connected to the display electrode has both a touch signal transmitting function and a receiving function, and the stylus is close to a certain one. The display electrode, the touch signal circuit with the signal transmitting function receives the touch signal emitted by the display electrode connected thereto, is received by the approaching stylus and is then transmitted back to the display screen, and is detected by the same display electrode, and The strip electrode is used as a touch positioning electrode. The stylus can be a stylus that re-encodes the received touch signal.

 The touch signal can be transmitted to the electrodes of each group of the display screen at different times through the scanning control mode. It is also possible to simultaneously transmit different 'frequency or different coded touch signals to the electrodes of each group of the display screen. The grouping of the display row and column electrodes may be one row electrode or one column electrode, or may be a plurality of row electrodes or a plurality of column electrodes.

 Through the above scheme display and touch-time multiplexing of the display electrodes, as long as the control electrode enters the touch state for a short time each time, although the flat panel display switches between the display state and the touch state, due to the display pixels The relaxation time and the retention time of the image in the human eye enable the display to be touch-tested while the display is uninterrupted. In this way, the display electrode is used as the sensing electrode, so that the flat panel display can be used for both display and touch without adding additional sensing elements, instead of requiring a separate touch screen.

BRIEF DESCRIPTION OF THE DRAWINGS

 Figure 1 shows the connection between a multi-position single-pole double-throw analog switch group and a display screen, display drive circuit, and touch signal circuit. Figure 2 shows how the multi-single-pole single-throw analog switch group is connected to the display, display drive circuit, and touch signal circuit.

 FIG. 3 is a touch-type liquid crystal display that is connected to the display terminal to detect the touch leakage current of the display electrode.

 FIG. 4 is a touch liquid crystal display that is connected to the driving source to detect leakage current of the display screen electrode.

 Fig. 5 is a touch liquid crystal display device for receiving a row electrode of a display panel and a column electrode for receiving a column electrode.

 6 is a touch-type liquid crystal display in which a stylus emits a display screen electrode to receive a touch signal.

 7 is a touch-type liquid crystal display in which a display electrode emits a stylus to receive a touch signal.

 FIG. 8 is a touch liquid crystal display in which a display column electrode emits a row electrode.

FIG. 9 is a touch-type liquid crystal display in which a single-sided partial electrode of a display screen emits another partial electrode. detailed description

 One embodiment of the present invention is shown in FIG. 3: A touch-type liquid crystal display 300 that detects a touch leakage current of a display screen electrode from a display terminal. The liquid crystal display 300 is composed of a liquid crystal display 310, single-pole double-throw analog switch groups 320 and 330, display drive circuits 340 and 350, touch signal circuits 360 and 370, and a control system 380. The N rows of IT0 electrodes 311 of the liquid crystal display 310 are connected to the fixed ends of the N-bit single-pole double-throw analog switch group 320. The display driving circuit 340 and the touch signal circuit 360 are respectively connected to the two switching ends of the analog switch group 320, M The column IT0 electrode 312 is connected to the fixed end of the M-bit single-pole double-throw analog switch group 330, and the display driving circuit 350 and the touch signal circuit 370 are respectively connected to the two switching ends of the analog switch group 330. In the display frame, the control system 380 causes the analog switch group 320 to scan the N rows of ITO electrodes of the 311 one by one from the connection display driving circuit 3 to the touch signal circuit 360, and then switch back from the connected touch signal circuit to the connection display. In the driving circuit, when the touch finger 390 touches the liquid crystal display 310 and one of the electrode electrodes 311 is connected to the touch signal circuit 360, the touch signal circuit 360 detects the coupling between the electrode and the electrode through the finger 390. The leakage current flowing out of the capacitor determines the travel positioning electrode; the output positioning electrode can also be determined; the touch position is determined by the respective positioning electrodes of the row electrode and the column electrode.

The second embodiment of the present invention is shown in FIG. 4: a touch liquid crystal display 400 that detects leakage current of the display screen electrode from the driving source end. The liquid crystal display 400 has a liquid crystal display 410, a beam electrode 411, a beam electrode 412, a signal selection and output circuit 420 (wherein the row signal selection and output circuit is 421 and the column signal selection and output circuit is 422), display driving The source circuit 430, the touch signal circuit 440 (the touch signal detecting circuit 441), the single-pole double-throw analog switch group 450, the control circuit 460, and the like are composed. The ports of the signal selection and output circuit 420 are connected to the fixed ends of the single-pole double-throw analog switch group 450, and the display drive source circuit 430 and the touch signal circuit 440 are respectively connected to the two switching terminals of the analog switch group 450. The normal state is that the single-pole double-throw analog switch group 450 causes the signal selection and output circuit 420 to communicate with the display drive source circuit 430 to transmit a display drive signal; the control circuit 460 switches the single-pole double-throw analog switch group 450 between the frames of the display drive. The display driving source circuit 430 is turned off, stops outputting the driving signal to any electrode of the display screen, and turns to communicate with the touch signal circuit 440 to transmit the touch signal; after completing the touch signal output of the display electrode, the single-pole double The throwing analog switch group 450 is returned to the normal state in which the signal selecting and outputting circuit 420 is connected to the display driving source circuit 430 to transmit the display driving signal. Between the frames of the display drive, control circuit 460 allows signal selection and The output circuit 420 outputs a touch signal to a single or partial display row electrode 411 and the column electrode 412 in a scanning manner. When the human finger 470 contacts the touch screen, the finger 470 forms a coupling capacitance with the electrode and flows out from the coupling capacitor. The leakage current detecting circuit 441 checks whether the electrode is touched by the leakage current flowing out of a certain threshold. When there are multiple electrodes exceeding the threshold, the one with the largest leakage current is the positioning electrode, or the leakage current The middle electrode exceeding the threshold electrode is a positioning electrode, and the touch electrodes are determined by the positioning electrodes of the row electrode 411 and the column electrode 412. Alternatively, the electrode is not detected by the leakage current flowing from the finger and the touch screen coupling capacitor. Being touched, but detecting the change of the oscillation frequency caused by the coupling capacitance between the finger and the electrode, detecting whether the electrode is touched by the change of the oscillation frequency exceeding a certain threshold, and when the number of electrodes exceeding the threshold is plural The largest one of the changes is the positioning electrode, or the intermediate electrode in the electrode whose frequency changes exceeds the threshold electrode as the positioning electrode, The respective positioning electrodes of the row electrode and the column electrode determine the bit touch position.

The third embodiment of the present invention is shown in FIG. 5: a touch-sensitive liquid crystal display 500 in which a display row electrode emits a row electrode receiving and a column electrode emitting column electrode receives. The liquid crystal display 500 has a liquid crystal display 510, N row electrodes 511, M column electrodes 512, signal selection and output circuits 520 (where the row signal selection and output circuits are 521 and the column signal selection and output circuits are 522), display driving The source circuit 530, the touch signal circuit 540 (the touch signal generating circuit 541, the touch signal receiving circuit 542), the single-pole double-throw analog switch group 550, the control circuit 560, and the like are formed. The port of the signal selection and output circuit 520 is connected to the fixed end of the single-pole double-throw analog switch group 550, and the display drive source circuit 530 and the touch signal circuit 540 are respectively connected to the two switching terminals of the analog switch group 550. The normal state is that the single-pole double-throw analog switch group 550 causes the signal selection and output circuit 520· to communicate with the display drive source circuit 530 to transmit the display drive signal; the control circuit 560 sets the single-pole double-throw analog switch group 550 between the frames of the display drive. Disconnected from the display driving source circuit 530, stop outputting the driving signal to any electrode of the display screen, and turn to communicate with the touch signal circuit 540 to transmit the touch signal; after completing the touch signal transmission to the display electrode, the single knife The double throw analog switch group 550 is returned to the normal state in which the signal selection and output circuit 520 is connected to the display drive source circuit 530 to transmit the display drive signal. Between the frames of the display drive, the control circuit 560 causes the signal selection and output circuit 520 to scan a single or partial display row electrode 511 to the touch signal receiving circuit 542 to receive the touch signal, and the remaining row electrodes. 511 is connected to the touch signal generating circuit 541. When the human finger 570 contacts the touch screen receiving circuit 542 electrode, the finger 570 forms a coupling capacitance with the electrode, and interferes with the electrode pair connected to the touch signal receiving circuit 542 from the connection. The touch signal is generated by the touch signal generating circuit 541, and the electrode connected to the touch signal receiving circuit 542 is used as a row positioning electrode; and the partial display column electrode 512 is connected to the touch signal receiving circuit 542. Receiving the touch signal, the remaining row electrodes 512 are connected to the touch signal generating circuit 541 to locate the column positioning electrodes; the touch electrodes are determined by the positioning electrodes of the row electrodes and the column electrodes.

 The fourth embodiment of the present invention is shown in FIG. 6 : a touch-sensitive liquid crystal display 600 in which a stylus emits a display screen electrode to receive a touch signal. The liquid crystal display 600 is composed of a liquid crystal display 610, N row electrodes 611, M column electrodes 612, single-pole single-throw analog switch groups 620 and 630, display driving circuits 640 and 650, touch signal detecting circuits 660 and 670, and control system 680. composition. The N rows of IT0 electrodes 611 of the liquid crystal display 610 are connected to the display driving circuit 640 or the touch signal detecting circuit 660 through the N-bit single-pole single-throw analog switch group 620, and the M-row column IT0 electrode 612 passes the M-bit single-pole single-throw analog switch. The group 630 is connected to the display driving circuit 650 or the touch signal detecting circuit 670. The control system 680 causes the analog group 620 to scan the N row electrodes of the 611 from the connection display driving circuit 640 to the touch signal detecting circuit 660, and then switches the electrodes from the connected touch signal circuit to the connection display driving circuit. When the stylus pen 690 having the signal transmitting function touches the liquid crystal display 610, when one of the N rows of the IT0 electrodes 611 is connected to the touch signal detecting circuit 660, the touch signal detecting circuit 660 detects the stylus The signal is transmitted to determine the travel positioning electrode; at the same time, the control system 680 also causes the analog switch group 630 to simultaneously turn the M column of the 612 electrode from the connection display driving circuit 650 to the touch signal detecting circuit 670, and then the electrode Connecting the touch signal circuit to the connection display driving circuit, when the stylus pen 690 having the signal transmitting function touches the liquid crystal display 610, when one of the M column ITO electrodes 612 is connected to the touch signal detecting circuit 670, The touch signal detecting circuit 670 detects the signal emitted by the stylus 690, thereby determining the column positioning electrode. Positioning of each electrode is determined by the position of the touch row and column electrodes.

The fifth embodiment of the present invention is shown in FIG. 7 : a touch-sensitive liquid crystal display 700 in which a display screen electrode emits a stylus to receive a touch signal. The active liquid crystal display 7, 00 has a display 710, N row electrodes 711, M column electrodes 712, display pixels 713, signal selection and output circuits 720 (where the row signal selection and output circuits are 721 and column signal selection sums) The output circuit is 722), the display driving source circuit 730, the touch signal generating circuit 740 (including the encoding circuit 741), the single-pole single-throw analog switch groups 750 and 760, the control circuit 770, and the like. The port of the signal selection and output circuit 720 is connected to one end of the single-pole single-throw analog switch group 750 and one end of the 760, and the display drive source circuit 730 and the touch signal are sent. The raw circuits 740 are respectively connected to the other end of the single-pole single-throw analog switch group 750 and the other end of the 760. The normal state is that the single-pole single-throw analog switch groups 750 and 760 cause the signal selection and output circuit 720 to communicate with the display drive source circuit 730 to transmit the display drive signal; the control circuit 770 allows the single-pole single-throw analog switch group between the frames of the display drive. 750 and 760 disconnect signal selection and output circuit 720 from display drive source circuit 730, causing signal selection and output circuit 720 to stop outputting a drive signal to any of the display output electrodes, and allowing single-pole single-throw analog switch sets 750 and 760 to signal The selection and output circuit 720 is connected to the touch signal generating circuit 740 having the encoding circuit 741 to transmit the touch signal. After the touch signal output to the display electrode is completed, the single-pole single-throw analog switch groups 750 and 760 are returned to the normal The signal selection and output circuit 720 is in communication with the display drive source circuit 730 to transmit a state in which the display drive signal is transmitted. Between the frames of the display drive, control circuit 770 causes row signal selection and output circuitry to be 721 and column signal selection and output circuitry to be 722 in a scanning manner, for row electrodes 711 and column electrodes 712 of a single or partial display screen. The encoded signal generated by the touch signal generating circuit 740 having the encoding circuit 741 and varying with the scanning movement is output, and the zero-level signal is output to the row and column electrodes not outputting the touch signal, and is touched by the stylus pen 780 having the signal receiving capability. In the touch screen, the stylus 780 receives the code that the touch signal generating circuit 740 having the encoding circuit 741 outputs to the display electrode through the signal selection and output circuit 720, and then changes from the display electrode to the scanning movement. The signal determines the positioning electrode by the received code, and determines the touch position by the positioning electrodes of the row electrode and the column electrode.

6 of the embodiment of the present invention is shown in FIG. 8 : a touch-sensitive liquid crystal display 800 in which a display column electrode emits a row electrode. The active liquid crystal display 800 has a display screen 810, N row electrodes 811, M column electrodes 812, display pixels 813, signal selection and output circuits 820 (where the row signal selection and output circuits are 821 and column signal selection and output circuits) 822), display drive source circuit 830, touch signal circuit 840 (where touch signal generation circuit 841 and touch signal receiving circuit 842), single-pole single-throw analog switch groups 850 and 860, control circuit 870, and the like. The touch signal generating circuit 841 generates a signal of a specific frequency, and the touch signal receiving circuit 842 receives a signal of another specific frequency. The port of the selection and output circuit 820 is connected to one end of the single-pole single-throw analog switch group 850 and one end of the 860, and the display drive source circuit 830 and the touch signal circuit 840 are respectively connected to the other end of the single-pole single-throw analog switch group 850 and 860. The other end. The normal state is that the single-pole single-throw analog switch groups 850 and 860 cause the signal selection and output circuit 820 to communicate with the display drive source circuit 830 to transmit the display drive signal; the control circuit 870 allows the single-pole single-throw analog switch group between the frames of the display drive. 850 and 860 disconnect signal selection and output circuit 820 from display drive source circuit 830 for signal selection And the output circuit 820 stops outputting the display driving signal to any of the electrodes of the display screen, and causes the single-pole single-throw analog switch groups 850 and 860 to connect the signal selection and output circuit 820 with the touch signal circuit 840 to output and receive the touch signal; After the touch signals are output and received by the screen electrodes, the single-pole single-throw analog switch groups 850 and 860 are returned to the normal state in which the signal selection and output circuit 820 is connected to the display drive source circuit 830 to transmit the display drive signals. Between the frames of the display drive, the control circuit 870 causes the signal selection and output circuit 822 to output a touch signal of a specific frequency of the touch signal generating circuit 841 to the column electrode 812 of the single or partial display screen in a scanning manner. The zero-potential signal is output to the column electrode that does not output the touch signal. At the same time, the control circuit 870 causes the signal selection and output circuit 821 to scan the touch signal receiving circuit 842 to receive the touch signal by a single or partial row electrode 811. When the stylus pen 880 having the signal transceiving capability contacts the touch screen, the stylus pen 880 receives the touch signal generating circuit 841 and outputs the signal to the column electrode 812 through the signal selection and output circuit 821, and then emits the signal from the column electrode 812. After the touch signal of the specific frequency is received, the touch signal received by the touch signal receiving circuit 842 is transmitted back to the row electrode 811 of the display screen, and the row and column are determined by the scan timing of the column touch signal and the line receiving touch signal. The positioning electrode determines the touch position by the positioning electrodes of the row electrode and the column electrode.

The seventh embodiment of the present invention is shown in FIG. 9 : a touch-type liquid crystal display 900 in which a single-sided partial electrode of the display screen emits another partial electrode. The passive liquid crystal display 900 has a display substrate 910, N row electrodes 911, a display lower substrate glass 920, M column electrodes 921, a display driving circuit 930, and a touch signal circuit 940 (where the touch signal generating circuit 941) And the touch signal receiving circuit 942), the single-pole single-throw analog switch group 950 and 960 and 970, the control circuit 980, and the like. The touch signal generating circuit 941 generates a signal of a specific frequency, and the touch signal receiving circuit 942 receives the signal of the specific frequency. The first one side of each of the three row electrodes 911 on the substrate glass 910 is connected to the fixed end of the single-pole single-throw analog switch group 950, and the display driving circuit 930 and the touch signal receiving circuit 942 of the touch signal circuit 940 are displayed. Connected to the two switching ends of the analog switch group 950, the first one of the other side is connected to the single-pole single-throw analog switch group 960; the second of each of the three electrodes is connected to the fixed end of the single-pole single-throw analog switch group 950, The driving circuit 930 and the touch signal generating circuit 941 of the touch signal circuit 940 are respectively connected to the two switching ends of the analog switch group 950; the third strip of each of the three electrodes passes from the one-side terminal through the single-pole single-throw analog switch group 950 and The display driving circuit 930 is connected, and the third side of the other side is connected to the single-pole single-throw analog switch group 960. The normal state is that the analog group 950 causes the row electrode 911 to communicate with the display driving circuit 930 to transmit a display driving signal, and the analog switch group 970 makes the column The electrode 921 communicates with the display driving circuit 930 to transmit a display driving signal, and the analog switch group 960 is in an off state; the control circuit 980 causes the analog switch groups 950 and 970 to make the row electrode 911 and the column electrode 921 between the frames of the display driving. The display driving circuit 930 is disconnected, stops displaying the driving signal for any electrode of the display screen, and causes the row electrode 911 to communicate with the touch signal generating circuit 941 or the touch signal receiving circuit 942 to receive the touch signal, and sense and transmit the touch signal. After the touch signal output and reception of the display electrode are completed, the analog switch groups 950 and 970 return to the row electrode 911 and the column electrode 921 to communicate with the display driving circuit 930 to transmit the display driving signal, and the analog switch group 960 is in the off state. . Between the frames of the display drive, the control circuit 980 causes the analog switch group 950 to connect the first strip of each of the three electrodes of the row electrode 911 with the touch signal receiving circuit 942 to receive the touch signal, and let the analog switch group 950 make the row electrode. The second strip of each of the three electrodes in the 911 is connected to the touch signal generating circuit 941 to output a touch signal, and the analog switch group 960 causes the third strip of each of the three electrodes of the row electrode 911 to communicate with the first strip to receive the touch signal. When the finger 990 contacts the electrodes of the three groups of the touch screen, the finger 990 forms a coupling capacitance with the electrode, and interferes with the first and third electrode pairs connected to the touch signal receiving circuit 942 from the connection touch signal generating circuit 941. The receiving of the touch signal from the second electrode is performed by the group of electrodes that are interfered with; and the finger 990 receives the first and third strips at different contact positions of the group of electrodes in the direction of the electrode. The touch signal interference is different, and the positioning position of the antegrade electrode direction is differently positioned by the interference; the touch position is determined by the positioning position of the row positioning electrode and the slanting electrode direction.

 The amplitude of the signal of the touch signal circuit and the emission signal of the stylus should be as small as possible, and the frequency should be much higher than the driving frequency of the liquid crystal display to avoid the interference of the touch signal to the normal display of the liquid crystal display. On the other hand, in order to reduce the attenuation of the touch signal, the impedance of the IT0 electrode should be as small as possible (at least not more than 15 / port), and the insulating layer should be coated on the IT0 electrode. If necessary, metal or other non-IT0 conductive layer can be plated on the IT0 electrode or on the electrode side, and even the conductive layer can be made into a ring shape to further reduce the attenuation of the touch signal, and also increase the ability to obtain a touch signal. . If necessary, multiple IT0 electrodes can be connected in parallel through an external circuit, or a series relationship can be formed through an external circuit to increase the ability to obtain touch signals.

 The above embodiments are not intended to represent all possible embodiments, and other modifications are also intended to be within the scope of the invention.

Claims

Rights request  1. A touch panel display having a display screen, a display driving circuit, and a touch signal circuit, characterized in that - between the display driving circuit and the display electrode, between the touch signal circuit and the display electrode The analog switch group is connected, the analog switch enables the display electrode or communicates with the display drive circuit to transmit the display drive signal; or directly communicates with the touch signal circuit to directly sense and transmit the touch signal; the display drive and the touch detection time division multiplexing display Electrodes, display electrodes are used for both display and touch detection.  2. The multi-bit analog switch set according to claim 1, wherein: the multi-bit analog switch group is a single-pole double-throw analog switch group, and one end of each single-pole double-throw analog switch in the switch group is fixedly connected to the display screen. One electrode is connected to the display driving circuit and the touch signal circuit at the other ends, and the display electrode switches between the connecting display driving circuit and the connecting touch signal circuit.  3. The multi-bit analog switch group according to claim 1, wherein: the multi-bit analog switch group is a single-pole single-throw analog switch group, and the display electrode is connected to the display drive circuit through a single-pole single-throw analog switch, through another A single-pole single-throw analog switch is connected to the touch signal circuit, and two single-pole single-throw analog switches connected to the same display electrode are not connected at the same time.  4. The display electrode connected to the multi-bit analog switch group according to claim 1, wherein: the display electrode connected to the same switch position of the multi-bit analog switch group is an electrode of the display screen.  5. The display electrode connected to the multi-bit analog switch group according to claim 1, wherein: the display electrode connected to the same switch position of the multi-bit analog switch group is a plurality of electrodes of the display screen.  6. The touch panel display has a display screen, a display driving circuit and a touch signal circuit, and the display driving circuit can be divided into a driving source circuit, a selection and output circuit, and a control circuit, and is characterized in that: the display driving source circuit and The selection and output circuits, the touch signal circuit and the selection and output circuits are connected by a plurality of analog switch groups, and the analog switches enable the selection and output circuits or communicate with the display drive source circuit to transmit display drive signals; or The touch signal circuit is connected to enable the display electrode to directly sense and transmit the touch signal; the display drive and the touch detection time division multiplex display electrode, and the display electrode is used for both the display drive and the touch detection. 7. The multi-bit analog switch group according to claim 6, wherein: the multi-bit analog switch group is a single-pole double-throw analog switch group, and one end of each single-pole double-throw analog switch in the switch group is fixedly connected to the selection and output. One input port of the circuit, the other end is connected with the display driving source circuit and the connection touch signal circuit, and the display electrode is connected to the display driving source Switch between the circuit and the connected touch signal circuit.  8. The multi-bit analog switch set according to claim 6, wherein: the multi-bit analog switch group is a single-pole single-throw analog switch group, and an input port of the selection and output circuit passes through a single-pole single-throw analog switch and a display drive. The source circuit is connected, and the single-pole single-throw analog switch is connected to the touch signal circuit, and the two single-pole single-throw analog switches connected to the input port of the same selection and output circuit are not connected at the same time.  9. The analog switch set according to claim 2 or 3 or 7 or 8, wherein the analog switch group is composed of a plurality of analog switch subgroups.  The display screen electrode connected to the touch signal circuit according to claim 1 or 6, wherein: in the period when the display electrode is connected to the touch signal circuit, each group of electrodes of the display screen is scanned and touched The circuit is connected.  11. The scanning communication between the display electrode and the touch signal circuit according to claim 10, wherein: when the display electrode is connected to the touch signal circuit, the scan connection between the display electrode and the touch signal circuit is Scanning of the area.  12. The display electrode connected to the touch signal circuit according to claim 1 or 6, wherein: the touch signal circuit transmits different touches in a simultaneous manner during a period in which the display electrode is connected to the touch signal circuit; The signal is applied to each set of electrodes on the display.  The touch signal circuit according to claim 1 or 6, wherein the touch signal circuit has at least one of a touch signal generating circuit, a touch signal receiving circuit and a touch signal detecting circuit. The touch signal directly sensed and transmitted by the touch signal circuit according to claim 1 or 6, wherein the touch signal generating circuit and the touch signal detecting circuit are connected to the same display electrode, and the touch signal is The generating circuit outputs a touch signal to the display electrode, and the touch signal detecting circuit detects a leakage portion of the coupling capacitance between the touch object and the display electrode. ' The touch signal directly sensed and transmitted by the touch signal circuit according to claim 1 or 6, wherein the touch signal generating circuit and the touch signal detecting circuit are connected to different display electrodes, and the touch The signal generating circuit outputs a touch signal to a part of the display electrode, and the touch signal detecting circuit detects a change of the touch signal on the other part of the display electrode. 16. The touch signal directly sensed and transmitted by the touch signal circuit according to claim 1 or 6, wherein: the touch signal generating circuit outputs a touch signal to the display electrode to have signal receiving and detecting functions. The stylus detects the touch signal emitted from the display electrodes. The touch signal directly sensed and transmitted by the touch signal circuit according to claim 1 or 6, wherein: the touch signal receiving and detecting circuit receives and detects the touch signal through the connected display electrode. The touch signal emitted by the stylus that emits the function. The touch signal directly sensed and transmitted by the touch signal circuit according to claim 1 or 6, wherein the touch signal generating circuit outputs a touch signal to the display electrode, and has a touch signal transceiving function. After receiving the touch signal, the stylus is sent back to the display screen, and the touch signal receiving and detecting circuit connected to the same display electrode that emits the touch signal receives and detects the reflected touch signal. .  The touch signal directly sensed and transmitted by the touch signal circuit according to claim 1 or 6, wherein the touch signal generating circuit outputs a touch signal to the display electrode, and has a touch signal transceiving function. After receiving the touch signal, the stylus is sent back to the display screen, and the touch signal receiving and detecting circuit connected to the display screen electrode that emits the touch signal receives and detects the reflected touch signal.  20. The touch signal emitted or received through a display screen electrode according to claim 14 or 15 or 16 or 17 or 18 or 19, wherein: the touch signal has a flow rate, a magnitude, a pulse width, a frequency, and a phase At least one of the coding features.  21. The frequency characteristic or coding feature of the touch signal according to claim 20, wherein: the characteristics of the touch signals emitted by the electrodes to the different display electrodes are different.  The touch panel display device according to claim 1 or claim 6, wherein: when the touch signal detecting circuit detects a touch signal exceeding a threshold value at a plurality of electrode positions, the touch signal detecting circuit detects the maximum touch signal. The electrode position is a touch positioning point.  The touch panel display device according to claim 1 or claim 6, wherein when the touch signal detecting circuit detects that the position of the electrode exceeding the threshold touch signal is an odd number, the middle electrode of the electrodes is touched Controlling the positioning point; when detecting that the electrode position exceeding the threshold touch signal is an even number, one of the middle two electrodes of the electrodes is a touch positioning point.