KR20170051784A - Display panel with touch screen and desplay device - Google Patents

Abstract

The present invention relates to a display panel having a touch screen in which a touch sensor is embedded in a pixel array and a display device using the touch panel. The display panel includes a pixel array including pixels connected to data lines and gate lines, touch sensor electrodes connected to the pixels Including a touch screen. The pixel array includes an active pixel region in which an input image is displayed and a dummy pixel region disposed outside the active pixel region. The touch sensor electrodes include at least one of a shape and a size different from the touch sensor electrodes. The disparate touch sensor electrode overlaps the dummy pixel region. A part of at least one of a gate line and a data line overlapped with the releasable touch sensor electrode in the dummy pixel region is thicker than the other part. The present invention can minimize the ripple deviation of the common voltage on the screen and improve the image quality.

Description

TECHNICAL FIELD [0001] The present invention relates to a display panel having a touch screen and a display using the touch panel.

The present invention relates to a display panel having a touch screen in which touch sensors are embedded in a pixel array, and a display device using the same.

A user interface (UI) enables a user (a user) to communicate with various electric or electronic devices, allowing the user to easily control the device as desired. Representative examples of the user interface include a keypad, a keyboard, a mouse, an on-screen display (OSD), a remote controller having infrared communication or radio frequency (RF) communication functions. User interface technology has been developed to enhance the user's sensibility and ease of operation. Recently, the user interface has evolved into a touch UI, a voice recognition UI, a 3D UI, and the like.

The touch UI implements a touch screen on the display panel to sense the touch input and transmit the user input to the electronic device. Touch UI is essential for portable information devices such as smart phones, and is being applied to notebook computers, computer monitors, and home appliances.

Recently, a method of implementing a touch screen using a technique of incorporating touch sensors in a pixel array of a display panel (hereinafter referred to as "In-cell touch sensor") has been applied. The touch sensors can be implemented as a capacitive type touch sensor that senses a touch based on a change in capacitance before and after the touch.

Incelel touch sensor technology can install touch sensors on the display panel without increasing the thickness of the display panel. The in-line touch sensor technology can utilize the electrodes connected to the pixels of the display panel as the touch sensor electrodes C1 to C4. 1, a common electrode for supplying a common voltage Vcom to the pixels of the liquid crystal display device may be divided into the touch sensor electrodes C1 to C4. The sensor wirings SL are connected to the touch sensor electrodes C1 to C4. Since the touch sensors Cs are embedded in the pixel array of the display panel 100, the touch sensors Cs are coupled to the pixels through the parasitic capacitance. In order to reduce the mutual influence due to the coupling of the pixels and the touch sensors Cs, the in-cell touch sensor technique time-divides one frame period into a display period and a touch sensing period. The in-line touch sensor technology supplies the common voltage Vcom, which is the reference voltage of the pixel, to the pixels through the touch sensor electrodes C1 to C4 during the display period, drives the touch sensors Cs during the touch sensing period, Sensing the input.

In the display device to which the in-line touch sensor technology is applied, since the touch sensor Cs is connected to the pixels, the electrical coupling therebetween may interfere with each other.

2 shows the parasitic capacitance between the in-cell touch sensor and the pixel.

2, the pixel includes a TFT (Thin Film Transistor) formed at the intersection of the data line SL and the gate line GL, a pixel electrode for charging the data voltage, a TFT and a pixel electrode, A storage capacitor Cst, a common electrode CL for supplying a common voltage Vcom, and the like. The in-cell touch sensor technology divides the common electrode CL into the touch sensor electrodes C1 to C3.

The parasitic capacitance existing in the pixel is the parasitic capacitance Cgd between the gate line GL and the data line DL, the parasitic capacitance Cdp between the data line DL and the pixel electrode PXL, The parasitic capacitance Cgp between the data lines DL and the touch sensor electrodes C1 to C4 and the parasitic capacitance Cdc between the gate lines DL and the touch sensor electrodes C1 to C4 Cgc) and the like.

The common voltage Vcom supplied through the touch sensor electrodes C1 to C4 varies according to the voltage of the gate pulse. The ripple of the common voltage Vcom may vary depending on the capacitance and / or resistance of the touch sensor Cs. When the ripple deviation of the common voltage Vcom increases on the screen, the reference voltage of the pixels becomes uneven, so that the luminance and color are different depending on the screen position, and the picture quality is deteriorated.

The touch screen is generally designed in the form of a screen of a display panel. The display panel may be designed as a deformed shape such as a curved portion or a diagonal portion depending on the applicable equipment. For example, a curved portion may be applied to the screen design of a smartphone. In a wearable device, a flexible device, an instrument panel, etc., the display panel and the touch screen may be designed in various shapes other than the conventional rectangular shape, for example, a circular shape, an elliptical shape, and a polygonal shape.

The area of the touch sensor electrodes C1 to C4 can be changed when the release design is applied to the touch screen. In this case, the parasitic capacitance between the touch sensor electrodes (C1 to C4) and the pixels in the mold design portion of the display panel to which the insole touch sensor is applied may be varied to vary the brightness. The contact resistance between the touch sensor electrodes (C1 to C4) and the sensor wiring (SL) varies in the mold design part of the display panel to which the insole touch sensor is applied, thereby causing a resistance difference between the touch sensor electrodes, . If the capacity and / or the resistance of the touch sensor electrode is changed in the mold designing portion, the operation sensor may cause a deviation of the touch sensor signal, thereby narrowing the operation margin of the touch sensor circuit and decreasing the accuracy of touch input sensing. 3 is an example in which the number of gate lines GL overlapped with the touch sensor electrode C1 is different from that of the touch sensor electrode C2 due to the mold release design of the touch screen and the parasitic capacitance Cgd between them is changed. 4 shows an example in which the number of contact holes (CNTs) connecting the touch sensor electrode C1 and the sensor line SL are changed due to the release design of the touch screen, thereby changing the contact resistance between them. As the number of contact holes (CNTs) increases, the contact resistance decreases. When the parasitic capacitance or the resistance difference occurs between the touch sensors, the common voltage Vcom supplied to the pixels is changed. The common voltage (Vcom) deviation between these touch sensors results in a luminance difference between the pixels.

The present invention provides a display panel capable of improving image quality irregularities in a display panel having a touch sensor electrode, and a display device using the same.

The display panel of the present invention includes a pixel array including pixels connected to data lines and gate lines, and a touch screen including touch sensor electrodes connected to the pixels. The pixel array includes an active pixel region in which an input image is displayed and a dummy pixel region disposed outside the active pixel region.

The touch sensor electrodes include at least one of a shape and a size different from the touch sensor electrodes. The disparate touch sensor electrode overlaps the dummy pixel region. A part of at least one of a gate line and a data line overlapped with the releasable touch sensor electrode in the dummy pixel region is thicker than the other part.

The display device of the present invention includes the display panel, a display driving circuit for writing data of an input image to the pixels during a display period, and a controller for supplying a common voltage to the pixels during the display period, And a touch sensing unit for sensing the touch input.

The present invention can improve the image quality by minimizing the ripple deviation of the common voltage on the screen by adjusting the number of contact holes or capacitance of the disparate touch sensor electrode using the dummy pixel region.

1 is a plan view showing a touch electrode pattern of a touch sensor and a touch sensing unit.
2 is an equivalent circuit diagram showing pixels of a display device to which an in-cell touch sensor is applied.
3 is a plan view showing an example in which the parasitic capacitance of the touch sensor to which the mold release design is applied is different from that of the other touch sensors in the display device to which the insole touch sensor is applied.
4 is a plan view showing an example in which the resistance of the touch sensor to which the mold release design is applied is different from that of the other touch sensors in the display device to which the insole touch sensor is applied.
5 and 6 are block diagrams showing a display device according to an embodiment of the present invention.
FIG. 7 is a diagram showing a plane arrangement of the in-cell type touch sensors and a circuit configuration of the touch sensing unit.
8 is a waveform diagram showing a driving signal of a display device according to an embodiment of the present invention.
9 to 12 are views showing a release touch screen according to the first embodiment of the present invention.
FIGS. 13A and 13B are cross-sectional views illustrating a pixel cross-sectional structure of the active pixel region and the dummy pixel region shown in FIG.
FIGS. 14 to 16 are views showing a release touch screen according to a second embodiment of the present invention.
17 is a view showing a method of increasing the capacity of the touch sensor in the mold release portion of the mold release touch screen.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The display device of the present invention can be implemented as a flat panel display device such as a liquid crystal display (LCD), an organic light emitting display (OLED) display, or the like. In the following embodiments, a liquid crystal display device will be described as an example of a flat panel display device, but the present invention is not limited thereto. For example, the display device of the present invention may be any display device to which the in-line touch sensor technology is applicable.

The touch sensor of the present invention can be implemented by a capacitive type touch sensor that can be embedded in a pixel array, for example, a mutual capacitance sensor or a self capacitance sensor. Hereinafter, the touch sensor will be described with reference to the magnetic sensor, but the present invention is not limited thereto.

5 and 6, the display device of the present invention includes a display panel 100, a display driving circuit, a touch sensing unit 110, and the like.

One frame period of the display panel 100 may be time-divided into one or more display periods and one or more touch sensing periods. The screen (pixel array) of the display panel 100 is time-divisionally driven to two or more blocks B1 to BM. The blocks B1 to BM need not be physically divided. FIG. 2 shows an example in which the screen of the display panel 100 is divided into two blocks B1 and B2. FIG. 3 shows an example in which the screen of the display panel 100 is divided into blocks M (M is a positive integer of 3 or more) (B1 to BM). The blocks of the display panel 100 are time-divided through the touch sensing period. For example, during the first display period, after the pixels 11 of the first block B are driven and the current frame data is written to the pixels 11, the touch input is sensed during the first touch sensing period . Following the first touch sensing period, during the second display period, the pixels 11 of the second block B are driven and the current frame data is written to the pixels 11 thereof.

The screen of the display panel 100 includes a pixel array in which an input image is reproduced. The pixel array includes m 占 n (n = 1 to n) pixels formed in a pixel region defined by m (m is a positive integer) data lines S1 to Sm and n (n is a positive integer) gate lines And includes pixels 11. Each of the pixels 11 is connected to TFTs (Thin Film Transistors) formed at intersections of the data lines S1 to Sm and the gate lines G1 to Gn, a pixel electrode for charging a data voltage, A storage capacitor (Cst) for holding a data voltage, and the like. The structure of the pixels 11 may be changed according to the driving characteristics of the flat panel display.

The pixel array of the display panel 100 includes touch sensor electrodes C1 to C4 and sensor wirings L1 to Li connected to the touch sensor electrodes C1 to C4 where i is a positive integer smaller than m and n, . The touch sensor electrodes C1 to C4 may be implemented by a method of dividing a common electrode connected to a plurality of pixels. One touch sensor electrode (C1 to C4) is commonly connected to the plurality of pixels (11) and forms one touch sensor (Cs). Accordingly, the touch sensors Cs supply the common voltage Vcom of the same potential to the pixels 11 during the display period, and are driven by the touch sensing unit 110 during the touch sensing period to sense the touch input.

The touch sensors built in the pixel array can be implemented with capacitive type touch sensors. The capacitance type can be divided into self capacitance and mutual capacitance. The self-capacitance is formed along a conductor wiring of a single layer formed in one direction. The mutual capacitance is formed between two orthogonal conductor wirings. FIG. 7 shows a self-capacitance type touch sensor, but the touch sensors are not limited thereto.

A black matrix, a color filter, or the like may be formed on the upper substrate of the display panel 100.

The display driver circuit includes a data driver 102, a gate driver 104 and a timing controller 106 and writes the data of the input image to the pixels 11 of the display panel 100 during the time-divided display period. The data driver 102 converts digital video data of an input image input from the timing controller 106 during a display period into a gamma compensation voltage and outputs a data voltage through output channels. The data voltage output from the data driver 102 is supplied to the data lines S1 to Sm during the display period. The output channels of the data driver 102 may be separated from the data lines S1 to Sm during the touch sensing period to maintain a high impedance state. The voltage of the pixels 11 is maintained as the data voltage by the storage capacitor since the TFTs are not turned on during the touch sensing period.

A multiplexer (not shown) may be disposed between the data driver 102 and the data lines S1 to Sm. This multiplexer may be formed on the substrate of the display panel 100 or may be integrated in the drive IC together with the data driver 102. The multiplexer distributes the data voltage input from the data driver 102 to the data lines S1 to Sm under the control of the timing controller 106. [ In the case of the 1: 2 multiplexer, the multiplexer time-divides the data voltages input through one output channel of the data driver 102 and supplies the data voltages to the two data lines S1 and S2 in a time-division manner. Therefore, when the 1: 2 multiplexer is used, the number of channels of the drive IC can be reduced to 1/2.

The gate driver 104 includes a shift register that sequentially outputs gate pulses to the gate lines G1 to Gn of the display panel 100 in response to the voltage of the Q node. The gate driver 104 sequentially supplies gate pulses (or scan pulses) synchronized with the data voltages to the gate lines G1 to Gm using the shift register during the display period to sequentially apply the data voltages to the display panel 100, ≪ / RTI > During the touch sensing period, the shift clock (CLK) is not input to the gate driver (104). As a result, the gate driver 104 does not output the gate pulse during the touch sensing period.

The timing controller 106 transmits the digital video data of the input image received from the host system (not shown) to the data driver 102. The timing controller 106 outputs a timing signal such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock MCLK received in synchronization with the input video data And outputs a data timing control signal for controlling the operation timing of the data driver 102 and a gate timing control signal for controlling the operation timing of the gate driver 104.

The gate timing control signal includes a start pulse (Multi Start Pulse, VST), a shift clock (CLK), an output enable signal (GOE), and the like. In the case of a GIP (Gate in Panel) circuit, the output enable signal (GOE) may be omitted. The GIP circuit is a gate driver 104 formed on a substrate on which a pixel array is formed in the display panel 100. [ The start pulse VST is input to the shift register of the gate driver 104 to control the start timing at which the first gate pulse is output from the shift register.

When the gate driving unit 104 is implemented as a GIP circuit, the gate timing control signal generated from the timing controller 106 is supplied to the gate high voltage VGH between the gate high voltage VGH and the gate low voltage VGL by a level shifter And is input to the GIP circuit. Therefore, the start pulse VST and the shift clock CLK input to the GIP circuit are swung between the gate high voltage VGH and the gate low voltage VGL. The gate high voltage VGH is higher than the threshold voltage of the transistors constituting the pixel and the gate low voltage VGL is lower than the threshold voltage of the transistors.

The host system may be implemented in any one of a television system, a set-top box, a navigation system, a DVD player, a Blu-ray player, a personal computer (PC), a home theater system, and a phone system. The host system includes a system on chip (SoC) with a built-in scaler to convert the digital video data of the input image into a format suitable for display on the display panel 100. The host system transmits timing signals (Vsync, Hsync, DE, MCLK) to the timing controller 106 together with the digital video data of the input video. In addition, the host system executes an application program associated with the coordinate information of the touch input received from the touch sensing unit 110. [

The touch sensing unit 110 drives the touch sensors during the touch sensing period in response to the synchronization signal Tsync input from the timing controller 106 or the host system. The touch sensing unit 110 supplies a touch driving signal to the sensor wirings L1 to Li during the touch sensing period to sense the touch input. The touch sensing unit 110 determines the touch input by analyzing the charge amount of the touch sensor depending on the presence or absence of the touch input, and calculates coordinates of the touch input position. The coordinate information of the touch input position is transmitted to the host system.

FIG. 7 is a diagram showing a plane arrangement of the in-cell type touch sensors and a circuit configuration of the touch sensing unit.

Referring to FIG. 7, each of the touch sensor electrodes C1 to C4 may be implemented as a divided pattern of a common electrode connected to a plurality of pixels. Each of the touch sensor electrodes C1 to C4 overlaps the plurality of pixels 11 and supplies a common voltage Vcom to the pixels 11 during a display period.

The touch sensing unit 110 includes a multiplexer 111, a sensing circuit 112, and a micro control unit (MCU) 113.

The multiplexer 111 selects the sensor wirings L1 to L3 connected to the sensing circuit 112 under the control of the MCU 113. [ The multiplexer 111 can supply the common voltage Vcom under the control of the MCU 113. [ Each of the multiplexers 111 reduces the number of channels of the sensing circuit 112 by sequentially arranging N sensor wirings L1 to L3 on the channels of the sensing circuit 112. [

The sensing circuit 112 amplifies and integrates the charge amount of the sensor wiring signal received through the multiplexer 111 and converts it into digital data. The sensing circuit 112 includes an amplifier for amplifying the received touch sensor signal, an integrator for accumulating the output voltage of the amplifier, an analog-to-digital converter (ADC) for converting the voltage of the integrator into digital data, Quot;). The digital data output from the ADC is transferred to the MCU 113 as touch raw data.

The MCU 113 controls the multiplexer 111 to connect the sensor wirings 115 to the sensing circuit 112. The MCU 113 compares data received from the sensing circuit 112 with a predetermined threshold value to determine a touch input. The MCU 113 executes a predetermined touch sensing algorithm to calculate coordinates for each touch input position to generate touch coordinate data XY and transmits the data XY to the host system 108. [ The sensing circuit 112 may be integrated into the touch IC (TIC) shown in Figs. 9 and 14. Fig. In FIGS. 9 and 14, the MUX denotes the multiplexer 111.

8 is a waveform diagram showing a driving signal of a display device according to an embodiment of the present invention. 8, Gate is the voltage of the gate lines G1 to Gn, and Data is the voltage of the data lines S1 to Sm. Vcom is the voltage of the touch sensor electrode.

Referring to FIG. 8, one frame period may be divided into a display period (Td1, Td2) and a touch sensing period (Tt1, Tt2). The display drive circuits 102, 104 and 106 write the current frame data to the pixels of the first block B1 during the first display period Td1 to output the image reproduced in the first block B1 as the current frame data Update.

During the first display period Td1, the block B2 excluding the first block B1 retains previous frame data and the touch sensor driver 110 does not drive the touch sensors Cs. The touch sensor driving unit 110 sequentially drives all the touch sensors Cs during the first touch sensing period Tt1 to sense the touch input and outputs coordinate information and identification information A touch report is generated and transmitted to the host system. The touch sensing unit 110 supplies a touch sensor driving signal to the touch sensor through the sensor wirings L1 to Li during the touch sensing period Tt1 to detect the amount of charge of the touch sensor before and after the touch input, And judges the touch input by comparison.

Subsequently, the display driving circuits 102, 104, and 106 write the current frame data to the pixels of the second block B2 during the second display period Td2 to output the image reproduced in the second block B2 to the current frame Update with data. During the second display period Td2, the first block B1 maintains previous frame data, and the touch sensor driver 110 does not drive the touch sensors Cs. The touch sensor driving unit 110 sequentially drives all the touch sensors Cs during the second touch sensing period Tt2 to sense the touch input and output coordinate information and identification information Generates a touch report and transmits it to the host system.

The touch sensing unit 110 supplies a touch sensor driving signal to the touch sensor through the sensor wirings L1 to Li during the touch sensing periods Tt1 and Tt2 to detect the amount of charge of the touch sensor before and after the touch input, The touch input is compared with the voltage.

The touch sensing unit 110 transmits coordinate information of the touch input to the host system every touch sensing periods Tt1 and Tt2. Therefore, the touch report rate is faster than the frame rate. The frame rate is the frame frequency at which one frame image is written to the pixel array. The touch report rate is the rate at which the coordinate information of the touch input is generated. The higher the touch report rate is, the faster the coordinate recognition speed of the touch input becomes, thereby improving the touch sensitivity.

The data driver 102 may supply the AC signal LFD having the same phase as the touch sensor driving signal during the touch sensing periods Tt1 and Tt2 in order to reduce the parasitic capacitance between the pixels 11 and the touch sensors have. Similarly, in order to reduce the parasitic capacitance between the pixels 11 and the touch sensors, the gate driver 102 applies an AC signal LFD having the same phase as the touch sensor driving signal during the touch sensing periods Tt1 and Tt2 Can supply. The touch sensing unit 110 may supply an AC signal LFD to sensor wirings other than the sensor wirings connected to the touch sensors that currently sense the touch input, thereby preventing the parasitic capacitance between neighboring touch sensors.

In Insel touch sensor technology, a common electrode connected to pixels of the display panel 100 is divided into touch sensor units and utilized as electrodes of the touch sensors Cs. For example, as described above, in the case of a liquid crystal display device, the in-cell touch sensor technology divides a common electrode and uses the divided common electrode patterns as a touch sensor electrode. Accordingly, since the touch sensors are combined with the pixels, the parasitic capacitance between the touch sensors and the pixels is increased. Since the touch sensors and the pixels are coupled through the parasitic capacitance, the pixels and the touch sensors are time-divisionally driven as shown in FIG. 8 because they may adversely affect each other. Even in the time division driving method, the touch sensitivity of the touch sensors and the touch recognition accuracy may be deteriorated due to the parasitic capacitance of the display panel 100.

The data lines S1 to Sm and the gate lines G1 to Gm of the display panel 100 during the touch sensing periods Tt1 and Tt2 and the alternating current When the signal LFD is supplied, the transfer capacitance of the parasitic capacitance of the display panel 100 can be reduced. This is because the voltage difference across the parasitic capacitance can be minimized to minimize the amount of parasitic capacitance charged. Reducing the parasitic capacitance of the touch sensor improves the signal to noise ratio (SNR) of the touch sensor signal, thereby widening the operation margin of the touch sensing part and improving the touch input and the touch sensitivity .

9 to 12 are views showing a release touch screen according to the first embodiment of the present invention.

Referring to FIGS. 9 to 12, the touch screen of the present invention includes a plurality of touch sensors to be implemented as an in-cell touch sensor, and a touch sensing unit (MUX, TIC).

Each of the touch sensors includes touch sensor electrodes (C1a to C2b) connected to a plurality of pixels. In this touch screen, at least one touch sensor is different in shape and / or size from the other touch sensors. 9 to 12 show examples in which the shape and size of the touch sensors disposed at the upper and lower ends of the touch screen are different from those of the other touch sensors. The 1a-th and 1b-th touch sensor electrodes C1a and C1b are a tactile touch sensor electrode having one side inclined or curved.

One or more sensor wirings 31 to 34 are connected to each of the touch sensor electrodes C1a to C2b. The sensor wirings 31 to 34 may be arranged side by side in the same direction and connected to a touch sensing unit (MUX, TIC). In this case, the sensor wirings 31 to 34 do not cross each other.

9, the lengths of the sensor wirings 31 to 34 are shown to be different but actually have the same length and line width in order to make the resistance of the sensor wirings 31 to 34 the same. As shown in FIGS. 11 and 12, some of the sensor wirings that extend further into the dummy pixel area DUM may be longer than the other sensor wirings. If the length of the sensor wiring is different, the resistance between the sensor wirings 31 to 34 can be made equal by adjusting the line width of the sensor wiring.

The resistance and / or the capacitance of the first and the first touch sensor electrodes C1a and C1b disposed at the upper portion of the touch screen differ from those of the other touch sensor electrodes because the electrode size thereof is small.

The present invention disposes the arrangement of the contact holes CNTs of the sensor wirings 31 to 34 connected to the touch sensor electrodes C1a to C2b on the touch screen in a mirror symmetrical structure on the touch screen. 9 to 12, the electrode structure of the release touch screen is symmetrical, and the sensor wirings 31 to 34 are disposed symmetrically with respect to the virtual center line VL across the center of the touch screen, (C1a to C2b). The sensor wirings 31 to 34 may be connected to the touch sensor electrodes C1a to C2b in a vertically symmetrical structure on the touch screen according to the structure of the release touch screen. Since the sensor wirings 31 and 33 can be disposed in the portion having a large width in the first and the first touch sensor electrodes C1a and C1b due to the arrangement method of the sensor wirings, The number can be increased and the number thereof can be made equal. The contact resistance between the touch sensor electrodes C1a and C1b and the sensor wirings 31 and 33 can be reduced when the number of the contact holes CNT is increased. The contact resistance between the touch sensor electrodes C1a and C1b may be equalized by making the number of the contact holes CNT of the 1a touch sensor electrode C1a and the 1b touch sensor electrode C1b equal to each other.

Referring to FIGS. 11 and 12, the pixel array of the present invention is divided into an active pixel area AA in which an image is displayed and a dummy pixel area DUM disposed outside the active pixel area AA. The data of the input image is not written to the pixels of the dummy pixel area DUM. The data lines S1 to Sm and the gate lines G1 to Gn are formed in the pixel array across the active pixel area AA and the dummy pixel area DUM. The pixel structure of the active pixel region AA and the pixel structure of the dummy pixel region DUM are similar to those of FIGS. 13A and 13B.

The present invention utilizes the pixels of the dummy pixel area DUM shown in Figs. 11 and 12 to increase the number of contact holes of the first and the first touch sensor electrodes C1a and C1b and the sensor wirings 31 and 33 can do. For example, if the number of contact holes between the 1a touch sensor electrode C1a and the first sensor wiring 31 is smaller than the number of contact holes between the 2a touch sensor electrode C2a and the second sensor wiring 32, The number of contact holes of the first touch sensor electrode C1a can be increased by further extending the one sensor wiring 31 along the dummy pixel area DUM and connecting the first sensor wiring 31 to the first touch sensor electrode C1a in the dummy pixels . The first sensor wiring 31 connected to the 1a touch sensor electrode C1a is in contact with the 1a touch sensor electrode C1a through the contact hole CNT disposed in the active pixel area AA, Touches the first touch sensor electrode C1a through the contact hole CNT arranged in the region DUM.

12, "PXL1" is a pixel electrode (hereinafter referred to as "first pixel electrode") in the active pixel area AA to which the first sensor wiring 31 is connected, and "PXL2" (Hereinafter referred to as a " second pixel electrode ") in the dummy pixel region DUM to which the pixel electrode is connected.

FIGS. 13A and 13B are cross-sectional views illustrating a pixel cross-sectional structure of the active pixel region and the dummy pixel region shown in FIG. 13A is a sectional structure of an active pixel (hereinafter referred to as " first pixel ") of an active pixel region. 13B is a sectional structure of a dummy pixel (hereinafter referred to as " second pixel ") of the dummy pixel region.

13A and 13B, a buffer insulating film BUF, a semiconductor pattern ACT, and a gate insulating film GI are stacked on a substrate of a display panel 100. As shown in FIG. A first metal pattern is formed on the gate insulating film (GI). The first metal pattern includes a gate (GE) of a TFT and gate lines (G1 to Gn) connected to the gate (GE). An interlayer insulating film INT is formed on the gate insulating film GI. The second metal pattern is formed on the gate interlayer insulating film INT. The second metal pattern includes data lines S1 to Sm and a source SE and a drain DE of the TFT. The drain DE is connected to the data lines S1 to Sm. The source SE and the drain DE of the TFT are in contact with the semiconductor pattern ACT of the TFT through the contact hole penetrating the interlayer insulating film INT.

The first protective film PAS1 covers the second metal pattern. A second protective film PAS2 is formed on the first protective film PAS1. And a third protective film PAS3 is formed on the second protective film PAS2. And a third metal pattern M3 is formed on the third protective film PAS3. The third metal pattern (M3) includes the sensor wiring (31). The fourth protective film PAS4 is formed on the third protective film PAS3 so as to cover the third metal pattern M3. A contact hole CNT exposing a part of the third metal pattern M3 is formed on the fourth protective film PAS4.

And a fourth metal pattern is formed on the fourth protective film PAS4. The fourth metal pattern includes a touch sensor electrode C1a formed of a transparent electrode material such as indium-tin oxide (ITO). The touch sensor electrode C1a is in contact with the sensor wiring 31 formed of the third metal pattern M3 through the contact hole CNT. The fifth protective film PAS5 is formed on the fourth protective film PAS4 so as to cover the fourth metal pattern. A contact hole exposing the source SE of the TFT is formed in the fifth protective film PAS5. A contact hole exposing the pixel electrode PXL2 in the dummy pixel region is formed in the fifth protective film PAS5. The first, third, fourth and fifth protective films PAS1, PAS3, PAS4 and PAS5 may be formed of an inorganic insulating material such as SiOx or SiNx. The second protective film PAS2 may be formed of an organic insulating material such as photo-acryl.

A fifth metal pattern is formed on the fifth protective film PAS5. The fifth metal pattern includes pixel electrodes PXL1 and PXL2 formed of a transparent electrode material such as ITO.

The first pixel electrode PXL1 disposed in the active pixel region AA is not short-circuited with the touch sensor electrode C1a to which the common voltage Vcom is supplied. Accordingly, the liquid crystal molecules of the first pixel are normally driven according to the electric field generated by the voltage difference between the first pixel electrode PXL1 to which the data voltage is supplied and the touch sensor electrode C1a to which the common voltage Vcom is supplied.

On the other hand, the second pixel electrode PXL2 disposed in the dummy pixel region DUM is short-circuited with the touch sensor electrode C1a. Therefore, the liquid crystal molecules of the second pixel are not driven because an electric field is not generated between the pixel electrode PXL2 and the touch sensor electrode C1a.

FIGS. 14 to 16 are views showing a release touch screen according to a second embodiment of the present invention.

Referring to FIGS. 14 to 16, the touch screen of the present invention includes a plurality of touch sensors to be implemented as an in-cell touch sensor, and a touch sensing unit (MUX, TIC).

Each of the touch sensors includes touch sensor electrodes (C1a to C2b) connected to a plurality of pixels. In this touch screen, at least one touch sensor is different in shape and / or size from the other touch sensors. FIGS. 14 to 16 show examples in which the shape and size of the touch sensors disposed at the upper and lower ends of the touch screen are different from those of the other touch sensors. The 1a-th and 1b-th touch sensor electrodes C1a and C1b are a tactile touch sensor electrode having one side inclined or curved.

One or more sensor wirings 31 to 34 are connected to each of the touch sensor electrodes C1a to C2b. The sensor wirings 31 to 34 may be arranged side by side in the same direction and connected to a touch sensing unit (MUX, TIC). In this case, there is no intersection between the sensor wirings 31 to 34 in the active pixel area.

In FIG. 14, the lengths of the sensor wirings 41 to 44 are shown as being different but actually have the same length and line width to equalize the resistance of the sensor wirings 41 to 44. As shown in Fig. 14, some sensor wirings that extend further into the dummy pixel area DUM may be longer than other sensor wirings. If the length of the sensor wiring is different, the resistance between the sensor wirings 31 to 34 can be made equal by adjusting the line width of the sensor wiring.

The resistance and / or the capacitance of the first and the first touch sensor electrodes C1a and C1b disposed at the upper portion of the touch screen differ from those of the other touch sensor electrodes because the electrode size thereof is small.

In the present invention, the arrangement of the contact holes (CNTs) of the sensor wirings (31 to 34) connected to the touch sensor electrodes (C1a to C2b) in the release touch screen is repeated in the same pattern. 15, the number of contact holes CNT between the first and second touch sensor electrodes C1a and 41b symmetrical to each other and the number of contact holes CNT between the first touch sensor electrode C1b and the sensor wiring 43 The number of contact holes (CNTs). Therefore, it is preferable to arrange the arrangement of the contact holes in a mirror symmetrical structure in consideration of the symmetrical structure of the mold-release display as shown in FIG.

14 and 15, the number of contact holes of the first touch sensor electrode C1a and the number of contact holes of the first touch sensor electrode C1b may be different from each other. The number of contact holes can be increased by extending the sensor wiring 43 longer along the dummy pixel area DUM and connecting the sensor wiring 43 and the touch sensor electrode C1b at dummy pixels as shown in FIG. . 16, the sensor wiring 33 connected to the 1b touch sensor electrode C1b is in contact with the 1b touch sensor electrode C1b via the contact hole CNT arranged in the active pixel area AA, And contacts the first b touch sensor electrode C1b through the contact hole CNT disposed in the dummy pixel region DUM. Therefore, the present invention can equalize the contact resistances of the touch sensor electrodes C1a and C1b by adjusting the number of contact holes of the touch sensor electrodes C1a and C1b using the dummy pixel region.

The present invention reduces the resistance variation between the touch sensor electrodes of the mold release portion in the mold release touch screen. As a result, the present invention minimizes the ripple deviation of the common voltage (Vcom) supplied through the touch sensor electrodes during the display period, thereby making it possible to uniformize the picture quality throughout the screen.

17 is a view showing a method of increasing the capacity of the touch sensor in the mold release portion of the mold release touch screen.

17, the line width of the gate lines G1 to G4 overlapping the touch sensor electrode C1a having a differential structure is increased in the dummy pixel region DUM to form small differential touch sensor electrodes C1a The parasitic capacitance Cgc of the other touch sensor electrodes can be increased to be equal to the parasitic capacitance of the other touch sensor electrodes.

The parasitic capacitance Cdc of the touch sensor electrode C1a can be increased by increasing the data lines S5 and S6 overlapping the touch sensor electrode C1a in the dummy pixel region DUM. Since the gate high voltage VGH of the gate pulse is much higher than the data voltage, the method of increasing the line width of the data lines S5 and S6 in such a manner as to increase the line width of the gate lines G1 to G4, It is more effective in reducing ripple variance.

Disclosure of Invention Technical Problem [10] The present invention reduces a capacitance deviation between touch sensor electrodes of a release part in a release touch screen. As a result, the present invention minimizes the ripple deviation of the common voltage (Vcom) supplied through the touch sensor electrodes during the display period, thereby making it possible to uniformize the picture quality throughout the screen.

The embodiment of FIG. 17 can be applied not only to the mold release touch screen as shown in FIGS. 9 and 14 but also to any type of mold release touch screen.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

100: display panel 102: data driver
104: scan driver 106: timing controller
110: Touch sensing unit SL, L1 to Li, 31 to 34, 41 to 44: Sensor wiring
C1 to C4, C1a, C1b, C2a, C2b: touch sensor electrodes

Claims (6)

A pixel array including pixels connected to data lines and gate lines; And
And a touch screen including touch sensor electrodes connected to the pixels,
Wherein the pixel array includes an active pixel region in which an input image is displayed and a dummy pixel region disposed outside the active pixel region,
The touch sensor electrodes,
Wherein at least one of the shape and the size includes a different type touch sensor electrode different from the other touch sensor electrodes,
The dummy touch sensor electrode overlaps the dummy pixel region,
Wherein a portion of at least one of a gate line and a data line overlapping the release touch sensor electrode in the dummy pixel region is thicker than the other portion. The method according to claim 1,
Further comprising sensor wires connected to the touch sensors,
The sensor wiring connected to the release touch sensor electrode is contacted with the release touch sensor electrode through the contact hole disposed in the active pixel region and the contact wiring is contacted with the release touch sensor electrode through the contact hole arranged in the dummy pixel region, Display panel. 3. The method of claim 2,
Wherein the contact holes connecting the touch sensor electrodes and the sensor wiring are mirror-symmetrically arranged on the touch screen. A display panel including a pixel array including pixels connected to data lines and gate lines, and a touch screen including touch sensor electrodes connected to the pixels;
A display driving circuit for writing data of an input image to the pixels during a display period; And
And a touch sensing unit for supplying a common voltage to the pixels during the display period and sensing the touch input by driving the touch sensors during a touch sensing period,
Wherein the pixel array includes an active pixel region in which an input image is displayed and a dummy pixel region disposed outside the active pixel region,
The touch sensor electrodes,
Wherein at least one of the shape and the size includes a different type touch sensor electrode different from the other touch sensor electrodes,
The dummy touch sensor electrode overlaps the dummy pixel region,
Wherein a portion of at least one of a gate line and a data line overlapping the release touch sensor electrode in the dummy pixel region is thicker than the other portion. 5. The method of claim 4,
Further comprising sensor wires connected to the touch sensors,
The sensor wiring connected to the release touch sensor electrode is contacted with the release touch sensor electrode through the contact hole disposed in the active pixel region and the contact wiring is contacted with the release touch sensor electrode through the contact hole arranged in the dummy pixel region, / RTI > 6. The method of claim 5,
Wherein the contact holes connecting the touch sensor electrodes and the sensor wiring are mirror-symmetrically arranged on the touch screen.

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