TWI383195B - Driving mrthod of input display device - Google Patents

Description

Driving method of input type display device

The present invention relates to an input type display device, and more particularly to a drive circuit of an input type display device.

The application of touch panels is becoming more and more extensive. One of the embedded touch panels is based on the use of photosensitive enamel materials to form an array of photosensitive elements by detecting photocurrent (photo The change of -induced current confirms the touch position. This embedded structure is highly valued because it is compatible with the process of the active matrix liquid crystal display.

The first figure discloses an equivalent circuit diagram of an embedded current type photosensitive element. A photosensitive element 10 is disposed in a pixel defined by the scanning lines G1, G2 and the data line D1. The photosensitive element 10 includes a photosensitive film transistor 20 and a switch. Thin film transistor 30. The photosensitive film transistor 20 is for sensing a photocurrent, and the drain of the photosensitive film transistor 20 is connected to a common electrode 40. The switching film transistor 30 controls its opening and closing through the scanning line G1. The source of the switching thin film transistor is connected to a read line R1, and the drain is connected to the source of the photosensitive thin film transistor 20. When the switching thin film transistor 30 is turned on, the photocurrent value is read by the read line R1.

The second figure discloses an equivalent circuit diagram of an in-charge type photosensitive element. A photosensitive element 50 is similarly disposed in the pixels defined by the scanning lines G1, G2 and the data line D1. The photosensitive element 50 is similar to the current-type photosensitive element 10, but One more capacitor C. The switching thin film transistor 30 is controlled to be turned on and off by a scanning line G1. When the switching thin film transistor 30 is turned on, a current will be charged to the capacitor C through the reading line R1. Subsequently, when the switching film transistor 30 is turned off, the electric charge stored in the capacitor C is discharged through the photosensitive film transistor 20. Then, when the switching thin film transistor 30 is turned on again, the current passing through the read line R1 will again charge the capacitor C, returning the capacitor C to the original state of charge. By recharging the amount of charge to the capacitor C, the amount of charge neutralized by the photosensitive film transistor 20 can be estimated, and the magnitude of this amount is proportional to the amount of light received by the photosensitive film transistor 20.

The current type photosensitive element 10 or the charge type photosensitive element 50 uses the photosensitive film transistor 20 to generate a photocurrent, and the switching film transistor 30 controls the photocurrent signal to be output from the reading line R1 to a data processing chip (not As shown in the figure), all the read lines on the touch panel are connected to a plurality of data processing chips.

In order to save the number of data processing chips, the third A figure discloses a time sharing driving circuit of the touch panel. As shown in the figure, the touch panel is divided into three photosensitive areas A, B, and C, and each photosensitive area is divided into a plurality of sub-areas, such as A (1), B (1), and C (1). Each of the photosensitive sub-regions includes six photosensitive elements as shown in the first or second figure, which are respectively disposed in six sub-pixels (hereinafter referred to as pixels), and the gate lines G1, G2, and G3 respectively control the photosensitive regions. The signals of the photosensitive elements in A, B, and C are read via read lines R1-R6, R7-R12, and R13-R18, respectively, wherein R1, R7, and R13 are connected to the same pin of a data processing chip, R2. R8 and R14 are connected to the same pin of a data processing chip, and the remaining read lines are also connected by the same principle.

In addition, as in the driving method disclosed in FIG. B, G1-G3 is sequentially given a high-level voltage. When G1 is given a high level voltage and the photosensitive element in the photosensitive area A is turned on, the photocurrent signal is read out via the read lines R1-R6, and the photosensitive elements in the remaining photosensitive areas B, C are not turned on. In addition, the same applies to the scanning lines G2 and G3. Therefore, according to the driving circuits and methods of the third A and third B, the number of 2/3 data processing chips can be saved.

However, the above driving circuit and method can reduce the number of wafers used, but when reading the photocurrent signal generated by a certain photosensitive region, the reading lines of the remaining photosensitive regions cause a parasitic capacitance effect. As shown in the fourth figure, when the photocurrent signal of the photosensitive area A is read, the read lines R7-R18 of the remaining photosensitive areas B and C generate parasitic capacitance, which will affect the accuracy of the read signal.

Therefore, there is a need to provide a new drive circuit for an input display device that can improve the lack of parasitic capacitance effects.

It is an object of the present invention to provide a driving method of an input type display device which can improve the problem of inaccurate reading of a photocurrent signal caused by a parasitic capacitance effect.

According to the above object, the present invention provides a driving method of an input display device, the input display device comprising a plurality of sensing regions, wherein each sensing region includes a plurality of sensing sub-regions, each sensing sub-region comprising a plurality a pixel, and at least one read pixel, each row of read pixels connected to a read line, each read line is connected to a pin of a data processing chip, and the read line and the pin There is a switch between the settings. The driving method includes the plurality of sensing regions being commonly connected to the data processing chip, and reading signals of each read pixel in a plurality of picture cycle times, wherein the plurality of sensing regions are time-divisionally read in the same picture period When a certain sensing area is read, the switch connected to the sensing area is turned on, and the switches connected to the remaining sensing areas are turned off.

In another embodiment of the invention, an odd switch and an even switch are disposed in parallel between the read line and the pin. During the same picture period, the plurality of sensing areas are time-divisionally read. When an sensing area is read, if the odd-numbered picture is displayed, the odd-numbered switch connected to the sensing area is turned on, and the even-numbered switch is turned on. It is turned off, and the switches connected to the remaining sensing areas are also turned off. If the screen is even, the even switch connected to the sensing area is turned on, the odd switch is turned off, and the switches connected to the remaining sensing areas are also turned off. .

5A to 5F show a driving circuit and a driving method of an input type display device according to an embodiment of the present invention. For the sake of brevity and convenience of description, the description may be exaggerated in number, and the actual situation is not limited thereto. .

In this example, the reading of the input type display device of the present invention is divided into three sensing areas, and is read in three frame period: the fifth to fifth pictures show the first The driving circuit and method of the picture period; the fifth C to fifth D pictures show the driving circuit and method of the second picture period; and the fifth to fifth figures F show the driving circuit and method of the third picture period.

As shown in the fifth A, C, and E diagrams, the input display device of the present invention includes a plurality of pixel lines defined by a plurality of scanning lines G1-G13 and a plurality of data lines D1-D10, and the pixel array is divided into Three sensing areas SZ1, SZ2, and SZ3, wherein the sensing area SZ1 is divided into three sub-areas of SZ1(1), SZ1(2), and SZ1(3), and the sensing areas SZ2 and SZ3 are also the same, each picture period Read only one sub-area. In the first picture period, only the sub-areas SZ1(1), SZ2(1), and SZ3(1) are read as shown in the fifth picture A; in the second picture, only the sub-area SZ1(2) is read. , SZ2 (2), SZ3 (2), as shown in the fifth B picture; in the third picture, only the sub-regions SZ1 (3), SZ2 (3), SZ3 (3), such as the fifth C picture Shown.

As shown in the figure, each of the sensing sub-regions is composed of 12 pixels defined by 5 scanning lines and 4 data lines, but is not limited thereto. Among the 12 pixels, 4 pixels are each configured with one sensing element to form a readout pixel (for example, S1-S12); the sensing element may be as shown in the first figure or the second figure. Photosensitive element, or other type, such as a resistive sensing element.

Since the input type display device may be used with an input pen (not shown), the input pen outputs a spot that simultaneously illuminates a plurality of sensing elements to cause a change in photocurrent. Since the area of the pixel is small relative to the area of the spot, and the distribution of the sensing elements is too dense, the aperture ratio of the display device is lowered, so that each pixel is usually not required in each sensing (secondary) region. The sensing elements are all set. In practice, factors such as touch resolution requirements and aperture ratio can be considered to determine which pixel components have sensing components.

As an example and not limitation, in the embodiment, each of the sensing sub-regions has four pixels each configured with one sensing element, forming four reading pixels, and the reading pixels of the same row are read by the same reading. Take the line output, so there are 2 read line outputs for each sensing sub-area and each sensing area: sensing area SZ1 output reading lines R1, R2; sensing area SZ2 output reading lines R3, R4; The measurement area SZ3 outputs the read lines R5 and R6. In other embodiments, the read pixels of the same row may be output by different strips of read lines, respectively.

Wherein, the read lines of different sensing areas can be connected to the pins of the same data processing chip to save the number of chips. Taking the fifth A picture as an example, the signals of the pixels S1-S2 and S3-S4, for example, the photocurrent signals, are turned on by the scanning lines G1 and G3 and output by the reading lines R1 and R2; and the pixel S5- is read. The signals of S6 and S7-S8 are outputted by the read lines R3 and R4 after being turned on by the scanning lines G5 and G7; the signals of the pixels S9-S10 and S11-S12 are read, and are read by the scanning lines G9 and G11. Lines R5 and R6 are output. The read lines R1, R3, and R5 are connected to a pin of a data processing chip (not shown), and the read lines R2, R4, and R6 are connected to another pin of the data processing chip. The number of data processing wafers can be saved.

In addition, a switch is disposed between a read line and a data processing chip in each sensing region. For example, a switch T1 is disposed between the read line R1 and the data processing chip; a switch T2 is disposed between the read line R2 and the data processing chip, and so on. The switches T1-T6 are used to control whether the signal of the read pixel is read. When the switch is turned on, the signal for reading the pixel is transmitted to the data processing chip via the read line, and is not when the switch is turned off. A plurality of control lines C1-C3 are respectively connected to the switches T1-T6 to control the opening and closing of the switch, and the switches on the reading line of the same sensing area can be connected to the same control line, for example, the reading line R1 of the sensing area SZ1. The switches T1 and T2 on R2 are connected to the same control line C1. In other embodiments, the switches on the read line of the same sensing area may be connected to different control lines, and the read lines R1, R2 in the sensing area SZ1 may be read time-sharing.

In a preferred embodiment of the present invention, the input display device is a thin film transistor liquid crystal display, and in order to be compatible with the existing process, the switches T1-T6 are also thin film transistors; the control lines C1-C3 are disposed on the display device. In the surrounding area, avoid affecting the aperture ratio of the display device.

According to the driving circuit of the embodiment of the present invention, when the signal of a certain sensing area is read, the switches on the reading line of the sensing area are also simultaneously or sequentially opened, and the switches on the reading lines of the remaining sensing areas are Then all closed. Taking the fifth B diagram as an example, the scan lines G1-G12 are sequentially provided with a high level signal (high voltage, for example, 5 to 15V) to turn on the read pixels S1-S12 in the sensing area SZ1(1). While the scan lines G1-G4 sequentially output a high-level signal, the control line C1 connecting the read lines R1 and R2 of the same sensing area SZ1(1) also outputs a high-level signal at the same time, so that the connection is the same. The switches T1 and T2 of the measurement area SZ1(1) are simultaneously turned on, and the control lines C2-C3 connecting the read lines R4-R6 of the different sensing areas SZ2(1) and SZ3(1) output a low level signal. Therefore, the switches T3-T6 connecting the different sensing regions SZ2(1), SZ3(1) are turned off; similarly, the driving methods of the sensing regions SZ2(1), SZ3(1) are similar.

The fifth C to fifth F diagrams show the driving circuit and method of the second picture period and the third picture period, wherein the symbol SE indicates the arrangement position of the read pixel, and the reading principle is the same, and will not be described again.

6A to 6F show a driving circuit and a driving method of an input type display device according to another embodiment of the present invention. This embodiment can be analogized to the embodiments of the fifth to fifth F diagrams, and therefore only the differences will be described, and the same portions will not be described again.

As shown in the sixth A, C, and E diagrams, two switches are arranged in parallel between one read line and the data processing chip in each sensing area, instead of the previous one. For example, T1 _n and T1 _n+1 are arranged in parallel between the read line R1 and the data processing chip; T2 _n and T2 _n+1 are arranged in parallel between the read line R2 and the data processing chip; and the remaining read lines R3-R6 The same. The switches T1 _n and T2 _{n are} connected to the control line C1 _n ; the switches T1 _n+1 and T2 _{n+1 are} connected to the control line C1 _n+1 , and the other switches T3 _n -T6 _{n+1 are} also connected to the control line C2 _n -C3 _{n+ 1} .

When a certain sensing area is read, a switch connected to the sensing area is turned on by a high level signal (high voltage, for example, 5 to 15V), and other switches connected to the sensing area are connected to other sensing. The switches in the area are all turned off. Taking the sixth A picture as an example, assuming that n is an odd number and n+1 is an even number, when the display device is in the first picture period, the scanning lines G1-G4 in the sensing area SZ1(1) sequentially output a high level. During the signal period, the control line C1 _n connecting the read lines R1 and R2 of the sensing region SZ1(1) also outputs a high-level signal at the same time, so that the switches T1 _n and T2 _n connected to the sensing region SZ1(1) are simultaneously is opened, the remaining control lines C1 _{n + 1} -C3 _{n + 1} outputs a low level signal, the switch _{T1 n + 1, T2 n +} 1, T3 n -T6 n + 1 is turned off. As shown in FIG. 6C and FIG. 6D, when the current display device is displayed as the second screen, when the signal of the pixel in the sensing region SZ1(2) is read, the sensing region SZ1(2) is connected. The switches T1 _n+1 and T2 _n+1 are turned on because the control line C1 _n+1 outputs a high level signal, and the remaining switches T1 _n , T2 _n , T3 _n -T6 _n+1 are turned off. The reading of the third picture period of the sixth to sixth figures F is also deduced by analogy.

It should be noted that in the embodiment, the switches T1 _{n -} T6 _{n+1 are} preferably thin film transistors, but may be other types of switches. In addition, there is no limitation that only two switches are arranged in parallel between one read line and the data processing chip in each sensing area, or a plurality of switches may be arranged in parallel.

According to the embodiment, a plurality of switches arranged in parallel are turned on in different picture periods, which can improve when only one switch, such as a thin film transistor, is disposed between one read line and the data processing wafer in each sensing area. Since the open state is maintained for a long time, the threshold voltage of the thin film transistor is shifted.

According to the driving circuit and the driving method of the embodiments of the present invention described above, the time sharing architecture can reduce the number of use of the data processing chip, and since the switches on the read line of the undetected sensing region are all turned off, no parasitic capacitance is generated. The effect is to ensure that the read signal is accurate.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; all other equivalent changes or modifications which are not departing from the spirit of the invention should be included in the following Within the scope of the patent application.

10. . . Photosensitive element

20. . . Photosensitive film transistor

30. . . Switching film transistor

40. . . Common electrode

50. . . Photosensitive element

C. . . Capacitor

A-C. . . Photosensitive area

C1-C3. . . Control line

D1-D10. . . Data line

G1-G13. . . Scanning line

R1-R18. . . Read line

S1-S12. . . Reading pixels

SE. . . Reading pixels

SZ1-SZ3. . . Sensing area

T1-T6. . . switch

T1 _n -T6 _n+1 . . . switch

The first to second figures disclose an equivalent circuit diagram of a conventional photosensitive element;

3A to 3B are diagrams showing a driving circuit and a driving method of a conventional input type display device;

The fourth figure reveals the absence of a driving circuit for revealing a conventional input display device;

5A to 5F are diagrams showing a driving circuit and a driving method of an input display device according to an embodiment of the present invention; and

6A to 6F disclose a driving circuit and a driving method of the input type display device according to another embodiment of the present invention.

C1-C3. . . Control line

D1-D10. . . Data line

G1-G13. . . Scanning line

R1-R6. . . Read line

S1-S12. . . Photosensitive element

SZ1-SZ3. . . Sensing area

T1-T6. . . switch

Claims (14)

A driving method of an input display device, the input display device comprising a pixel array defined by a plurality of scan lines and a plurality of data lines, the pixel array being divided into a plurality of sensing regions and repeatedly arranged, wherein each of the pixels The sensing region includes a plurality of sensing sub-regions, the number of the sensing sub-regions being the same as the number of the sensing regions, each sensing sub-region comprising: a plurality of pixels; and at least one sensing component configured to be configured Forming at least one read pixel in the plurality of pixels, each row of read pixels is connected to a read line, each read line is connected to a pin of a data processing chip, and the read line A switch is disposed between the pin, and when the switch is turned on, a signal for reading a pixel connected to the read line can be transmitted to the pin; the driving method includes: the plurality of sensing regions are connected in common Up to the data processing chip, the signals of each read pixel are read in a plurality of picture cycle times, and the plurality of sensing areas are time-divisionally read during the same picture period, when a certain sensing area is read. , the Sensing region connected switch is opened and the switch remaining connected to the sensing area is closed. The method of claim 1, wherein each of the sensing elements comprises a photosensitive film transistor and a switching film transistor. The method of claim 1, wherein each of the sensing elements comprises a photosensitive film transistor, a switching film transistor, and a capacitor. The method of claim 1, wherein the input display device is a thin film transistor liquid crystal display. The method of claim 1, wherein the relationship is a thin film transistor switch. The method of claim 1, wherein the number of the plurality of picture periods is equal to the number of the plurality of sensing areas. The method of claim 1, wherein one of the picture periods reads a sensing sub-area of each of the sensing areas in a time division manner. A driving method of an input display device, the input display device comprising a pixel array defined by a plurality of scan lines and a plurality of data lines, the pixel array being divided into a plurality of sensing regions and repeatedly arranged, wherein each of the pixels sense The sensing area includes a plurality of sensing sub-areas, the number of the sensing sub-areas being the same as the number of the sensing areas, each sensing sub-region comprising: a plurality of pixels; and at least one sensing element disposed in at least one The plurality of pixels form at least one read pixel, and each row of read pixels is connected to a read line, and each read line is connected to a pin of a data processing chip, and the read line is At least one odd switch and one even switch are arranged in parallel between the pins. When one of the odd switch or the even switch is turned on, the signal of the read pixel connected to the read line can be transmitted to the connection. The driving method includes: the plurality of sensing regions are commonly connected to the data processing chip, and the signals of the read pixels are read in a plurality of picture cycle times, and the plurality of sensing regions are Time-sharing reading, when a certain sensing area is read, if it is an odd-numbered picture, the odd-numbered switch connected to the sensing area is turned on, the even-numbered switch is turned off, and the switches connected to the remaining sensing areas are also shut down, The screen is even, the sensing area of the sensing switch even-connection is opened, odd switch is turned off, and the remainder of the sensing region a switch is also connected to off. The method of claim 8, wherein each of the sensing elements comprises a photosensitive film transistor and a switching film transistor. The method of claim 8, wherein each of the sensing elements comprises a photosensitive film transistor, a switching film transistor, and a capacitor. The method of claim 8, wherein the input display device is a thin film transistor liquid crystal display. The method of claim 8, wherein the open film transistor switch. The method of claim 8, wherein the number of the plurality of picture periods is equal to the number of the plurality of sensing areas. The method of claim 8, wherein one of the picture periods reads a sensing sub-region of each of the plurality of sensing regions in a time division manner.