CN101996684A - Shift register and touch device - Google Patents

Abstract

The invention relates to a touch device, which comprises a plurality of gate lines, a plurality of pixels, a plurality of sensing control lines and a plurality of sensing units, wherein each pixel is electrically coupled to one of the gate lines to determine whether to receive data according to the potential of the gate line, and each sensing unit is electrically coupled to one of the sensing control lines to determine whether to perform touch sensing operation according to the potential of the sensing control line. The touch device further comprises a shift register string, the shift register string comprises a plurality of shift registers connected in series, each shift register is provided with a first output end and a second output end, the first output end provides a first clock pulse signal to one of the grid lines to control the electric potential of the grid line, the second output end provides a second clock pulse signal to one of the sensing control lines to control the electric potential of the sensing control line, and the first clock pulse signal is different from the second clock pulse signal. The invention also discloses a shift register.

Description

Shift register and touch device

technical field

The present invention relates to the field of display touch technology, and in particular to a method for determining the scanning times of touch points of a display touch panel.

Background technique

With the development of technology, flat-panel displays (such as liquid crystal displays) are widely used in mobile phones, notebook computers, and desktop display devices due to their advantages of high image quality, small size, light weight, and wide application range. And various consumer electronic products such as TV, and have gradually replaced the traditional cathode ray tube display and become the mainstream of the display.

The touch panel provides a new human-computer interaction interface, which is more intuitive and more humane in use. Integrating the touch panel and the flat-panel display to form a display touch panel, so that the flat-panel display has a touch function, is an application trend in the development of the flat-panel display.

In order to make the display product thinner and its cost more competitive, the display will tend to use the gate-on-array (Gate-On-Array, GOA) type gate drive circuit to generate the gate drive signal, and the GOA type gate The driving circuit usually includes multiple shift registers connected in series to sequentially output multiple gate drive signals, and the output of each shift register can also be used as the start pulse signal (Start Pulse Signal) of the next shift register. .

However, for a display integrated with a capacitive touch panel in the prior art, since the capacitive touch panel usually receives a continuous clock pulse signal, a multiplexer is used to distribute the clock pulse signal to each sensing control line As a driving signal (driving signal) to drive the sensing units electrically coupled with each sensing control line to determine whether these sensing units perform touch sensing operations, so that the output channel of the multiplexer (channel ) must increase as the resolution of the touch panel increases; therefore, when the resolution of the touch panel increases, the cost of the multiplexer will increase significantly.

Contents of the invention

One of the objectives of the present invention is to provide a shift register, which can reduce the cost of the touch device when applied to the touch device.

Another object of the present invention is to provide a touch device to reduce costs.

A shift register provided by an embodiment of the present invention includes: a pull-up module, an output module and a stabilization module. Wherein, the pull-up module receives the input signal and provides the input signal to the output terminal of the pull-up module. The output module has a first output terminal and a second output terminal, the output module receives different first clock pulse signals and second clock pulse signals, and the output module is electrically coupled to the output terminal of the pull-up module, so as to use the pull-up module The potential on the output end of the first output end determines whether to provide the first clock pulse signal and the second clock pulse signal to the first output end and the second output end respectively. The stabilizing module is electrically coupled to the output terminal, the first output terminal and the second output terminal of the pull-up module to stabilize the output terminal, the first output terminal and the second output terminal of the pull-up module to a specific potential during a predetermined period.

In an embodiment of the invention, the second clock signal has a plurality of pulses during the enable period of the first clock signal.

In an embodiment of the present invention, the above-mentioned pull-up module may include a transistor, and the transistor has a gate, a first source/drain and a second source/drain; the gate of the transistor and the first source/drain simultaneously receive For the above input signal, the second source/drain of the transistor is the output terminal of the pull-up module.

In an embodiment of the present invention, the above-mentioned output module may include a first transistor and a second transistor; wherein, the first transistor has a gate, a first source/drain and a second source/drain, and the gate of the first transistor The polarity is electrically coupled to the output end of the pull-up module, the first source/drain of the first transistor receives the first clock pulse signal, and the second source/drain of the first transistor serves as the first output end; the second transistor has a gate electrode, the first source/drain and the second source/drain, the gate of the second transistor is electrically coupled to the output end of the pull-up module, the first source/drain of the second transistor receives the second clock pulse signal, The second source/drain of the second transistor serves as the second output terminal.

In an embodiment of the present invention, the aforementioned stabilization module may include a first transistor, a second transistor, and a third transistor; wherein, the first transistor has a gate, a first source/drain, and a second source/drain, and the first transistor has a gate, a first source/drain, and a second source/drain, and the second The gate of a transistor receives a stable control signal to turn on the first transistor in a predetermined period, the first source/drain of the first transistor is electrically coupled to the output terminal of the pull-up module, and the second source/drain of the first transistor Electrically coupled to the above-mentioned specific potential; the second transistor has a gate, a first source/drain and a second source/drain, the gate of the second transistor receives a stable control signal to turn on the second transistor in a predetermined period of time , the first source/drain of the second transistor is electrically coupled to the first output terminal, the second source/drain of the second transistor is electrically coupled to a specific potential; the third transistor has a gate, a first source/ The drain and the second source/drain, the gate of the third transistor receives a stable control signal to turn on the third transistor in a predetermined period, the first source/drain of the third transistor is electrically coupled to the second output terminal, The second source/drain of the third transistor is electrically coupled to a specific potential.

A touch device provided by an embodiment of the present invention includes a plurality of gate lines, a plurality of pixels, a plurality of sensing control lines, and a plurality of sensing units; each pixel is electrically coupled to one of the gate lines to Whether to receive data is determined according to the potential of the electrically coupled gate line, and each sensing unit is electrically coupled to one of the sensing control lines to be determined according to the potential of the electrically coupled sensing control line Whether to perform touch sensing operations. Moreover, the touch device further includes a shift register string, wherein the shift register string includes a plurality of shift registers connected in series, each shift register has a first output end and a second output end, and the first output end provides a second output end. a clock pulse signal to one of the gate lines to control the potential of the gate line, the second output terminal provides a second clock pulse signal to one of the sensing control lines to control the potential of the sensing control line, and the first clock The pulse signal is different from the second clock signal (for example, the second clock signal has a plurality of pulses during the enable period of the first clock signal).

In the embodiment of the present invention, a specific circuit design is performed on the shift register (for example, using two transistors to simultaneously output the gate driving signal and the touch driving signal) and combined with a composite control sequence (for example, using multiple clocks with different frequencies pulse signal), which can greatly reduce the cost incurred due to the improvement of the resolution of the touch panel.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1 shows a schematic structural diagram of a touch device according to an embodiment of the present invention;

FIG. 2 shows a schematic diagram of the internal circuit structure of the shift register in the touch device shown in FIG. 1;

FIG. 3 shows a timing diagram of a plurality of signals related to the touch device shown in FIG. 1 .

Among them, reference signs

10: Touch device 11: Display

110: Gate line 112: Data line

114: pixel 13: touch control department

130: Sensing control line 132: Reading line

134: Sensing unit 15: Shift register string

SR(n), SR(n+1), SR(n+2): shift register 151: pull-up module

153: Output module 155: Stability module

ST: start pulse signal Vss: ground potential

STN(n-1), STN(n), STN(n+1), STN(n+2), STN(n+3): gate drive signal

N(n), N(n+1), N(n+2): touch drive signal

CK1, CK2, XCK1, XCK2: Clock pulse signal T1～T6: Transistor

Q(n): enable signal DT1, DT2: enable cycle

Detailed ways

Please refer to FIG. 1 , which is a schematic structural diagram of a touch device according to an embodiment of the present invention. As shown in FIG. 1 , the touch device 10 has both display and touch functions, and includes a display portion 11 , a touch portion 13 and a shift register string 15 . Wherein, the display portion 11 includes a plurality of gate lines 110, a plurality of data lines 112 and a plurality of pixels 114; the gate lines 110 and the data lines 112 respectively extend along two different directions, and each pixel 114 is electrically coupled connected to one of the gate lines 110 and one of the data lines 112 to determine whether to receive display data from the data lines 112 according to the potential on the electrically coupled gate lines 111 . The touch part 13 includes a plurality of sensing control lines 130, a plurality of reading lines 132 and a plurality of sensing units 134; the sensing control lines 130 and the reading lines 132 extend along two different directions, and each sensor The detection unit 134 is electrically coupled to one of the sensing control lines 130 and one of the reading lines 132 to perform a touch sensing operation according to the potential on the electrically coupled sensing control line 130 . When a certain sensing unit 134 performs a touch sensing operation, the touch result can be read out from the reading line 132 electrically coupled to the sensing unit 134 . It should be noted here that the numbers of gate lines 110, data lines 112, pixels 114, sensing control lines 130, reading lines 132 and sensing units 134 shown in FIG. limit the invention.

Based on the above, the shift register string 15 receives the clock pulse signals CK1, XCK1, CK2, XCK2 and the start pulse signal ST provided by an external circuit such as a timing controller (Timing Controller), and includes a plurality of shift registers connected in series such as SR (n), SR(n+1) and SR(n+2). Each of the shift registers SR(n), SR(n+1) and SR(n+2) respectively outputs gate drive at its two output terminals according to two clock pulse signals (such as CK1 and CK2, or XCK1 and XCK2). One of the signals STN(n), STN(n+1) and STN(n+2) corresponding to one of the touch driving signals N(n), N(n+1) and N(n+2) Correspondingly; here, the output gate drive signals STN(n), STN(n+1) and STN(n+ 2) The output end is electrically coupled to the gate line 110 of the display portion 11, and the output end of which outputs touch driving signals N(n), N(n+1) and N(n+2) is electrically coupled The sensing control line 130 is coupled to the touch portion 13 .

More specifically, the shift register SR(n) receives the clock pulse signals CK1 and CK2 and the ground potential Vss, and is controlled by the gate driving signals STN(n-1) and STN(n+1), so as to CK1 and CK2 respectively output the gate driving signal STN(n) and the touch driving signal N(n) to the gate line 110 of the display portion 11 and the sensing control line 130 of the touch portion 13 . Similarly, the shift register SR(n+1) receives the clock pulse signals XCK1 and XCK2 and the ground potential Vss, and is controlled by the gate driving signals STN(n) and STN(n+2), so as to be controlled by the clock pulse signal XCK1 and XCK2 respectively output the gate drive signal STN(n+1) and the touch drive signal N(n+1) to the gate line 110 of the display part 11 and the sensing control line 130 of the touch part 13; the shift register SR (n+2) receives the clock pulse signals CK1 and CK2 and the ground potential Vss, and accepts the control of the gate drive signals STN(n+1) and STN(n+3), so as to output the gate respectively according to the clock pulse signals CK1 and CK2 The pole driving signal STN(n+2) and the touch driving signal N(n+2) are sent to the gate line 110 of the display part 11 and the sensing control line 130 of the touch part 13 .

Please refer to FIG. 2 , which shows the gate driving signals STN(n), STN(n+1) and STN(n) related to the clock pulse signals CK1, XCK1, CK2 and XCK2 of the touch device 10 shown in FIG. +2) and the timing diagram of touch driving signals N(n), N(n+1) and N(n+2). It can be known from FIG. 2 that the clock pulse signal CK2 has a higher frequency than CK1. In the enabling period DT1 of the clock pulse signal CK1, the clock pulse signal CK2 has multiple pulses; while in the clock pulse signal CK1 During the disable period (not shown in FIG. 3 ), the clock pulse signal CK2 has no pulse. Similarly, the clock pulse signal XCK2 has a higher frequency than XCK1. During the enable period DT2 of the clock pulse signal XCK1, the clock pulse signal XCK2 has multiple pulses; and during the disable period of the clock pulse signal XCK1, The clock pulse signal XCK2 has no pulse. Furthermore, the gate driving signals STN(n), STN(n+1) and STN(n+2) are sequentially output, and the touch driving signals N(n), N(n+1) and N(n+ 2) are also output sequentially; and the gate driving signal such as STN(n) output by the same shift register such as SR(n) is output synchronously with the touch driving signal such as N(n).

The internal circuit structure of each shift register SR(n), SR(n+1) and SR(n+2) in the touch device 10 shown in FIG. 1 will be described in detail below, so as to illustrate each shift register SR (n), SR(n+1) and SR(n+2) simultaneously generate the gate driving signal and the touch driving signal according to the working principle of two clock pulse signals with different frequencies. In the embodiment of the present invention, since each SR(n), SR(n+1) and SR(n+2) may have the same internal circuit structure, the following only uses the shift register SR(n) as an example for illustration . As shown in FIG. 3 , the shift register SR(n) includes a pull-up module 151 , an output module 153 and a stabilization module 155 .

Wherein, the pull-up module 151 includes a transistor T1, and the transistor T1 has a gate, a drain/source, and a source/drain, and the gate and the drain/source of the transistor T1 simultaneously receive the gate drive signal output by the upper-stage shift register STN(n−1) is used as the input signal, and the source/drain of the transistor T1 is used as the output terminal of the pull-up module 151 to output the enabling signal Q(n).

The output module 153 includes transistors T2 and T3. The transistors T2 and T3 both have a gate, drain/source and source/drain. The gates of the transistors T2 and T3 are electrically coupled to the output terminal of the pull-up module 151 to achieve The potential of the enable signal Q(n) determines whether to turn on the transistors T2 and T3, the drain/source of the transistor T2 receives the clock pulse signal CK1, the source/drain of the transistor T2 serves as the output terminal of the gate drive signal STN(n), and the transistor T2 The drain/source of the transistor T3 receives the clock pulse signal CK2, and the source/drain of the transistor T3 serves as an output terminal of the touch driving signal N(n). In this embodiment, when the enabling signal Q(n) is at a high potential, the transistors T2 and T3 are both turned on, and the clock pulse signals CK1 and CK2 are transmitted to the two output terminals of the output module 153 through the turned-on transistors T2 and T3 respectively; When the enabling signal Q(n) transitions to a low potential, both the transistors T2 and T3 are turned off, and the clock pulse signals CK1 and CK2 stop being transmitted to the two output terminals of the output module 153 .

Based on the above, the stabilizing module 155 includes transistors T4, T5 and T6; wherein, the transistors T4, T5 and T6 all have a gate, a drain/source and a source/drain, and the gates of the transistors T4, T5 and T6 all receive the next The gate drive signal STN(n+1) output by the stage shift register is used as a stable control signal, the drain/source of transistor T4 is electrically coupled to the output terminal of the pull-up module, and the drain/source of transistor T5 and T6 are electrically connected to The source/drain of the transistors T4, T5 and T6 are all electrically coupled to a specific potential such as the ground potential Vss. In this embodiment, when the stable control signal STN(n+1) is at a high potential, the transistors T2 and T3 are turned off, and the transistors T4, T5 and T6 are all turned on, so that the output terminal of the pull-up module 151 and the two terminals of the output module 153 are turned on. The potential on the output is pulled to ground potential Vss.

It should be noted here that the shift register SR(n) is not limited to using STN(n-1) as the above-mentioned input signal, nor is it limited to using STN(n+1) as the above-mentioned stable control signal. The above-mentioned input signal and stable control signal can be flexibly set by designers; in addition, the pull-up module 151, output module 153 and stable module 155 in the shift register SR(n) are not limited to the circuit shown in Figure 3 structure, as long as the gate driving signal and the touch driving signal with different frequencies can be simultaneously output according to a plurality of clock pulse signals.

To sum up, the embodiment of the present invention implements a specific circuit design for the shift register (for example, using two transistors to simultaneously output the gate driving signal and the touch driving signal) and cooperates with a composite control sequence (for example, using multiple different frequency clock pulse signal), which can greatly reduce the cost incurred due to the improvement of the resolution of the touch panel.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (11)

1. A shift register, characterized in that, comprising: A pull-up module, receiving an input signal and providing the input signal to the output terminal of the pull-up module; An output module has a first output terminal and a second output terminal, the output module receives a different first clock signal and a second clock signal, and the output module is electrically coupled to the pull-up The output terminal of the module is used to determine whether to provide the first clock pulse signal and the second clock pulse signal to the first output terminal and the second output terminal respectively according to the potential on the output terminal of the pull-up module; and a stabilizing module, electrically coupled to the output terminal of the pull-up module, the first output terminal and the second output terminal, so as to make the output terminal of the pull-up module, the first output terminal and the second output terminal in a predetermined period of time The second output terminal is stable to a specific potential. 2 . The shift register according to claim 1 , wherein the second clock signal has a plurality of pulses in an enabled period of the first clock signal. 3 . 3. The shift register according to claim 1, wherein the pull-up module comprises a transistor, the transistor has a gate, a first source/drain and a second source/drain, the gate of the transistor The input signal is received simultaneously with the first source/drain, and the second source/drain of the transistor is the output terminal of the pull-up module. 4. shift register according to claim 1, is characterized in that, this output module comprises: A first transistor has a gate, a first source/drain and a second source/drain, the gate of the first transistor is electrically coupled to the output terminal of the pull-up module, the first transistor of the first transistor is The source/drain receives the first clock pulse signal, and the second source/drain of the first transistor serves as the first output terminal; and A second transistor has a gate, a first source/drain and a second source/drain, the gate of the second transistor is electrically coupled to the output terminal of the pull-up module, the first of the second transistor The source/drain receives the second clock pulse signal, and the second source/drain of the second transistor serves as the second output terminal. 5. The shift register according to claim 1, wherein the stabilizing module comprises: A first transistor has a gate, a first source/drain and a second source/drain, the gate of the first transistor receives a stable control signal to turn on the first transistor in the predetermined period, the first The first source/drain of the transistor is electrically coupled to the output terminal of the pull-up module, and the second source/drain of the first transistor is electrically coupled to the specific potential; A second transistor has a gate, a first source/drain and a second source/drain, the gate of the second transistor receives the stable control signal to turn on the second transistor in the predetermined period, the second the first source/drain of the transistor is electrically coupled to the first output terminal, and the second source/drain of the second transistor is electrically coupled to the specific potential; and A third transistor has a gate, a first source/drain and a second source/drain, the gate of the third transistor receives the stable control signal to turn on the third transistor in the predetermined period, the third The first source/drain of the transistor is electrically coupled to the second output terminal, and the second source/drain of the third transistor is electrically coupled to the specific potential. 6. A touch device, comprising a plurality of gate lines, a plurality of pixels, a plurality of sensing control lines and a plurality of sensing units, each of these pixels is respectively electrically coupled to one of the gate lines for Whether to receive data is determined by the potential of the electrically coupled gate line, and each of the sensing units is electrically coupled to one of the sensing control lines so as to be based on the electrically coupled sensing control line Potential to perform touch sensing operation, characterized in that: The touch device further includes a shift register string, the shift register string includes a plurality of shift registers connected in series, each of these shift registers has a first output end and a second output end, the first output The terminal provides a first clock pulse signal to one of the gate lines to control the potential of the gate line, and the second output terminal provides a second clock signal to one of the sensing control lines to control the sensing control The potential of the line, and the first clock signal is different from the second clock signal. 7 . The touch device according to claim 6 , wherein the second clock signal has a plurality of pulses within an enable period of the first clock signal. 8. The touch device according to claim 6, wherein each of these shift registers comprises: A pull-up module, receiving an input signal and providing the input signal to the output terminal of the pull-up module; An output module, having the first output terminal and the second output terminal, the output module receives the first clock pulse signal and the second clock pulse signal, and the output module is electrically coupled to the output of the pull-up module terminal, to determine whether to provide the first clock signal and the second clock signal to the first output terminal and the second output terminal respectively according to the potential on the output terminal of the pull-up module; and A stabilizing module, electrically coupled to the output terminal of the pull-up module, the first output terminal and the second output terminal so as to connect the output terminal of the pull-up module, the first output terminal and the second output terminal within a predetermined period of time The second output terminal is stable to a specific potential. 9. The touch device according to claim 8, wherein the pull-up module comprises a transistor, the transistor has a gate, a first source/drain and a second source/drain, the gate of the transistor The input signal is received simultaneously with the first source/drain, and the second source/drain of the transistor is the output terminal of the pull-up module. 10. The touch device according to claim 8, wherein the output module comprises: A first transistor has a gate, a first source/drain and a second source/drain, the gate of the first transistor is electrically coupled to the output terminal of the pull-up module, the first transistor of the first transistor is The source/drain receives the first clock pulse signal, and the second source/drain of the first transistor serves as the first output terminal; and A second transistor has a gate, a first source/drain and a second source/drain, the gate of the second transistor is electrically coupled to the output terminal of the pull-up module, the first of the second transistor The source/drain receives the second clock pulse signal, and the second source/drain of the first transistor serves as the second output terminal. 11. The touch device according to claim 8, wherein the stabilization module comprises: A first transistor has a gate, a first source/drain and a second source/drain, the gate of the first transistor receives a stable control signal to turn on the first transistor in the predetermined period, the first The first source/drain of the transistor is electrically coupled to the output terminal of the pull-up module, and the second source/drain of the first transistor is electrically coupled to the specific potential; A second transistor has a gate, a first source/drain and a second source/drain, the gate of the second transistor receives the stable control signal to turn on the second transistor in the predetermined period, the second the first source/drain of the transistor is electrically coupled to the first output terminal, and the second source/drain of the second transistor is electrically coupled to the specific potential; and A third transistor has a gate, a first source/drain and a second source/drain, the gate of the third transistor receives the stable control signal to turn on the third transistor in the predetermined period, the third The first source/drain of the transistor is electrically coupled to the second output terminal, and the second source/drain of the third transistor is electrically coupled to the specific potential.

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