TWI416234B - Display device - Google Patents

Abstract

A readout pixel of an input display is provided. The readout pixel includes the fundamental elements as the normal pixel, and further includes a photo sensing element with a second switching element and a photo device generating a photo signal. The second switching element includes a second gate electrode connecting to a gate line, a second drain electrode, and a second source electrode connecting to a readout line. The third switching element includes a third gate electrode and a third drain electrode both connecting to a reference voltage, and a third source electrode connecting to the second drain electrode.

Description

Liquid crystal display

The present invention relates to a liquid crystal display, and more particularly to a liquid crystal display having an embedded third switching element.

Since the amorphous germanium material has a photosensitive property, the third switching element which can be used as a touch liquid crystal panel by this characteristic is a technology which has matured in recent years. The layout of the optical signal readout circuit provided by the third switching element composed of the amorphous germanium material and the touch liquid crystal panel is completely compatible with the process technology of the active thin film transistor liquid crystal display in the prior art. Therefore, the embedded touch panel with the amorphous germanium material as the third switching element has lower production cost due to high process compatibility than the touch liquid crystal panel with a touch panel.

On the other hand, the touch-sensitive liquid crystal panel formed by the external touch panel method can reduce the transmittance by 20% due to the light transmittance of the touch panel, and the amorphous germanium material is used as the third switching element. The embedded touch panel has light transmittance only related to the third switching element in the Readout Pixel structure and the optical signal readout line layout. Therefore, if the layout of the third switching element and its readout line in each read pixel is properly designed, the aperture ratio of the touch liquid crystal panel is not due to the design of the third switching element and the readout line. And it has too much impact.

Please refer to FIG. 1 , which is an equivalent circuit diagram of a third switching element in a read pixel structure of a touch control liquid crystal panel according to one of the prior art. As shown in the figure, the third switching element includes a photosensitive film transistor 121 as a light sensing element for generating an optical signal and transmitting a thin film transistor as a switching element 122 by a readout line (Readout). Line) read out. The photosensitive film transistor drain and gate D, G system 121 is connected to a bias voltage V _b and the source S of the switching element via the thin film 122 is connected to the crystal readout line. As can be seen from Fig. 1, the drain D of the thin film transistor switching element 122 is connected to the source S of the photosensitive thin film transistor 121, and the gate G and its source S are respectively connected to the read. A gate line of the pixel is drawn on the read line.

Please refer to FIG. 2(A), which shows a bonding pad on a substrate of a liquid crystal display in the prior art, including a gate pad and a data pad pad (Data Pads). The schematic diagram of the configuration is to connect with the driver IC via the module process. As shown in the figure, in a conventional liquid crystal display structure, the gate line bonding pad 55 and the data line bonding pad 45 are respectively disposed on two sides adjacent to the substrate, wherein the gate line is arranged. One side of the bonding pad 55 is also referred to as a gate line side, and the side for arranging the data line bonding pad 45 is referred to as a data line side. The gate line bonding pad 55 and the data line bonding pad 45 respectively connect each gate line and data line on the liquid crystal display to their respective driving IC outputs, so that the gate line signals of the driving IC output are The data signal can be transmitted to the gate line and the data line of the liquid crystal display through the gate line bonding pad 55 and the data line bonding pad 45 to effectively drive the display area of the display.

However, in the touch-control liquid crystal panel, in addition to the aforementioned gate lines and data lines, the arrangement of the readout lines of the optical signals must be added, so that the line configuration on the touch-type liquid crystal panel will be more complicated. Please refer to FIG. 2(B), which is a schematic diagram showing the arrangement of the readout lines 31 and their corresponding readout line bond pads 35 on a substrate in a touch-sensitive liquid crystal panel. As shown in the figure, in the case where a large number of read lines 31 are arranged and the gate line bonding pad 55 and the data line bonding pad 45 have been disposed on the gate line side and the data line side on the substrate, the read line bonding Pad 35 can only be placed on the extra side of the substrate to connect each sense line 31 to its corresponding sense line IC. In this case, an additional area 33 must be planned on the substrate of the touch-control liquid crystal panel to lay out the read line bond pad 35. The change of the substrate area may cause the module process of the touch liquid crystal panel. It is incompatible with the traditional LCD panel module process. Therefore, the configuration of the readout line 31 of the conventional touch panel and its corresponding readout line bond pad 35 may increase the manufacturing cost due to the incompatibility of the module process.

For the sake of the job, in view of the embedded touch panel in the prior art, the circuit layout of the read pixel structure affects the aperture ratio of the display, and the read line and the read line bond pad 35 The configuration also has the problem of incompatibility of the module process. Therefore, it is a perseverance spirit. After careful experimentation and research, a new "liquid crystal display with embedded third switching element" was finally conceived to effectively overcome the problem. Know the above missing in the embedded panel.

A first aspect of the present invention provides a liquid crystal display including at least a gate line, a data line, a read line, a first switching element, a second switching element, and a third switching element, wherein The gate line and the data line are arranged to cross each other, and the read line is arranged in parallel with the data line. The first switching element has a first gate connected to the gate line, a first drain connected to the data line, and a first connection with a liquid crystal capacitor and a storage capacitor of the liquid crystal display. a first source, wherein the liquid crystal capacitor and the storage capacitor are connected to a common voltage of the liquid crystal display. The second switching element has a second gate connected to the gate line, a second drain, and a second source connected to the read line. The third switching element has a third gate and a third drain connected to a reference voltage, and a third source and the third drain are connected to each other.

According to the above concept, the common voltage and the reference voltage are connected to each other.

According to the above concept, the liquid crystal capacitor is formed by stacking a pixel electrode, a liquid crystal layer and a common electrode of the liquid crystal display, and the storage capacitor is the pixel electrode and a dielectric layer of the liquid crystal display. And a common electrode.

According to the above concept, wherein the common electrode line further comprises a longitudinal structure, the edge of the pixel electrode is laid out and extends along the data line.

According to the above concept, the pixel electrode covers a portion of the third drain and the third gate.

According to the above concept, the pixel electrode covers a portion of the third gate and the third source.

A second aspect of the present invention provides a liquid crystal display comprising at least a substrate, a read line bond pad, a gate line and a data line, and a first and a second read line. The substrate has a plurality of first read pixels and a plurality of second read pixels formed thereon, the read line bond pads are arranged in an edge region of the substrate, and the gate lines and the data lines Interlaced with each other, the first readout line is arranged in parallel with the data line for connecting the plurality of first readout pixels to the readout line bond pad, and the second readout line is Arranged in parallel with the data line for connecting the plurality of second readout pixels to the sense line bond pad.

According to the above concept, the liquid crystal display further includes at least one gate line bonding pad arranged in the edge region of the substrate.

According to the above concept, the liquid crystal display further includes at least one data line bonding pad arranged in the edge region of the substrate.

According to the above concept, one of the first readout pixels further includes a first switching element, a second switching element and a third switching element. The first switching element has a first gate connected to the gate line, a first drain connected to the data line, and a first interconnected with a liquid crystal capacitor and a storage capacitor of the liquid crystal display a source, wherein the liquid crystal capacitor and the storage capacitor are connected to a common voltage of the liquid crystal display. The second switching element has a second gate connected to the gate line, a second drain, and a second source connected to the sense line. The third switching element has a third gate and a third drain connected to a reference voltage, and a third source and the third drain are connected to each other.

According to the above concept, the common voltage and the reference voltage are connected to each other.

A further aspect of the present invention provides a liquid crystal display comprising at least a substrate, a first and a second readout line, and a first and a second peripheral trace, wherein the first and the second are sequentially formed with a first a second insulating layer, and the substrate further has a plurality of first and second readout pixels, wherein the first and second readout lines respectively connect the plurality of first and second readout pixels, The first peripheral trace and the second peripheral trace are alternately formed on the first and second insulating layers to respectively connect the first and the second readout lines.

According to the above concept, the first insulating layer is a glass substrate.

According to the above concept, the first and the second peripheral traces are arranged in an edge region of the substrate.

According to the above concept, a read line bond pad is further disposed in an edge region of the substrate.

According to the above concept, one of the first readout pixels further includes a first switching element, a second switching element and a third switching element. The first switching element has a first gate connected to the gate line, a first drain connected to the data line, and a first interconnect with a liquid crystal capacitor and a storage capacitor of the liquid crystal display. a source, wherein the liquid crystal capacitor and the storage capacitor are connected to a common voltage of the liquid crystal display. The second switching element has a second gate connected to the gate line, a second drain, and a second source connected to the read line. The third switching element has a third gate and a third drain connected to a reference voltage, and a third source and the third drain are connected to each other.

According to the above concept, the common voltage and the reference voltage are connected to each other.

Another aspect of the present invention provides a liquid crystal display including at least a gate line, a data line, a read line, a first switching element, a second switching element, and a third switching element, wherein the gate The polar line and the data line are arranged to cross each other, and the readout line is arranged in parallel with the data line. In addition, the first switching element has a first gate connected to the gate line, a first drain connected to the data line, and a first interconnected with a pixel electrode of the liquid crystal display. Source. The second switching element has a second gate connected to the gate line, a second drain, and a second source connected to the read line. The third switching element is connected to the second drain and further includes a third gate, a third drain and a third source.

According to the above concept, the pixel electrode covers a portion of the third gate.

According to the above concept, the pixel electrode covers a portion of the third drain.

According to the above concept, the pixel electrode covers a portion of the third source.

In summary, the liquid crystal display device of the present invention can maintain the aperture ratio of the liquid crystal display not only by the layout design of the third switching element for reading the pixels, but also by a plurality of read lines. The design of the layered layout of the surrounding traces is achieved to reduce the readout line configuration and reduce the arrangement area of the readout line bond pads, so as to ensure that the module process of the liquid crystal display is not due to the readout line and its readout. The design of the wire bond pads has an impact.

The present invention can be further understood by the following drawings and detailed descriptions:

Please refer to FIG. 3(A) and FIG. 3(B), which respectively show a normal Pixel and a read of a touch-type liquid crystal panel according to a preferred embodiment of the present invention. The equivalent circuit diagram of the Readout Pixel. Generally speaking, the presence of these two kinds of pixels is usually included in the touch panel, but only the read pixel can sense the photocurrent generated by the change of light when the touch is applied. Please refer to FIG. 3(A), which is exactly the same as the display pixel of a conventional liquid crystal display. As shown in the figure, the common pixel includes a pair of gate lines Gate _n and Gate _{n. -1} and a pair of data lines Data _n and Data _n-1 are arranged to cross each other. A first switching element 101 has a first gate G ₁ connected to a first gate line Gate _n , and a first drain D _{1 is} connected to the first data line Date _n and a first source S _{1 is} connected to a liquid crystal capacitor C _LC and a storage capacitor C _{ST in} the liquid crystal display, and the liquid crystal capacitor C _LC and the storage capacitor C _{ST are} further Further connected to a common voltage V _{com of the} liquid crystal display. Compared with the common pixel 15, it only includes a first switching element 101 and no third switching element, and the read pixel shown in FIG. 3(B) additionally includes a light sensing unit. 12, a signal processing system (not shown) for generating an optical signal and transmitting it to the signal via a read line to analyze which position of the read pixel produces the optical signal. In addition, the light sensing unit 12 further includes a second switching element 102 and a third switching element 103. The second switching element 102 has a gate G ₂ connected to the first gate line Gate _n , a second drain D ₂ , and a second source S ₂ connected to the read line. The third switching element 103 has a third gate G ₃ and a third drain D ₃ connected to a reference voltage V _ref , and has a third source S ₃ and the second drain D _{2 .} Connected to each other. It should be further explained here that although the ordinary pixels and the read pixels are the pixels included in the touch liquid crystal display panel of the present invention, the technique of the present invention focuses on the design of the read pixel structure. Therefore, in the following description, only the read pixel structure and its related configuration will be dominant.

Please refer to FIG. 4(A), which is a schematic diagram showing the layout of the readout line in the touch panel according to a preferred embodiment of the present invention. As shown in the figure, each of the readout lines 31-1, 31-2, ..., 31-N is connected to the respective sense line bond pads 35 by their respective corresponding plurality of readout pixels. However, in such a line layout, the area of the light sensing unit on each read pixel must have a sufficient area size to induce a sufficiently large photocurrent. Therefore, in such a line layout, it is often necessary for the light sensing unit of the readout pixel to occupy a large area range in order to exert the utility of the light sensing unit. However, such a pixel structure design may affect the aperture ratio of the read pixel, and in order to further overcome this problem, the present invention proposes another preferred embodiment of the read line layout to avoid sacrificing the readout. The aperture ratio of the pixel.

Referring to FIG. 4(B), a first readout line 31-1 connecting a plurality of readout pixels 10 and a second readout connected to another set of readout pixels 20 are shown. The wires 31-2 are commonly connected to the same sense line bond pad 35, so that the photocurrent signal read on the sense line bond pad 35 will be the light perception from the two sets of readout pixels 10, 20. The photocurrent signals generated by the cells 12, 22 are measured. Therefore, even if the area of the photo sensing unit for reading the pixels is reduced, the photocurrent signal passing through the readout wire bonding pad 35 is also connected by reading multiple groups at the same time. Get compensation for the picture. Therefore, such a readout line layout design can not only achieve the advantage of maintaining the aperture ratio of the readout pixel, but also the number of the readout lines and the bonding pads 35 is also due to the mutual connection of the readout pixels of the complex array. cut back. In the present example, for the convenience of the description, the technical content of the present invention will be described with only two readout lines. In practical applications, the bond pads 35 can be connected to more than three readout lines, depending on the desired design of the product.

In the module process of the touch-type liquid crystal display, each of the readout lines 31-1, 31-2, ..., 31-N is connected to a printed circuit board through at least one read line bond pad 35 (not shown) In the picture). With the readout line layout design in the foregoing specific embodiment, the number of read line bond pads 35 may be reduced due to the co-connection of the readout pixels by the complex array, thereby enabling the touch according to the concept of the present invention. Controlled LCDs offer another advantage when it comes to module manufacturing. Please refer to FIG. 5 (A) and (B), which show the peripheral traces 36 of the readout lines 31-1, 31-2, ..., 31-N of the touch liquid crystal display of the present invention. The sense line bonding pad 35 is disposed on a substrate. Since the number of the read line bond pads 35 is reduced, the read line bond pads 35 can be disposed on the data line side or the gate line side of the touch liquid crystal display. Therefore, the module process of the touch liquid crystal display can be compatible with the module process of the general liquid crystal display. Moreover, since a plurality of peripheral traces 36 connecting the sense line bond pads 35 and the readout lines 31-1, 31-2, ..., 31-N are alternately formed on the edge regions of the substrate, different On the insulating layer, the area for arranging the peripheral traces 36 can be effectively reduced, for reasons explained below.

Please refer to FIGS. 6(A) and 6(B), which are schematic diagrams respectively illustrating a conventional peripheral trace 36 configuration and a peripheral trace configuration in accordance with the teachings of the present invention. Fig. 6(A) shows a case where a plurality of peripheral traces are arranged on the same layer, and as shown in the figure, in general, the arrangement area of the peripheral traces 36 is affected by the peripheral trace width w and the peripheral traces. The effect of the spacing d between them, and the spacing d must be maintained at a minimum limit, typically around 10 μm, to ensure process yield. However, if the peripheral traces 36 are changed to be disposed on a plurality of structural layers, the two layers of the structural layer can be accommodated twice in the same area under the same line width w and the same pitch d. The surrounding routing configuration is as shown in Figure 6 (B). In this embodiment, the spacing between adjacent upper and lower peripheral traces can be broken below the aforementioned minimum limit value and reduced to less than 10 μm, so that the peripheral traces accommodated in the unit space are increased to reduce the circumference of the liquid crystal panel. Area. Preferably, one of the structural layers may be a glass substrate. Therefore, according to the configuration of the various readout lines, the readout line bond pads, and the peripheral routing manners in the above concept of the present invention, the compatibility of the touch-sensitive liquid crystal display module process and the maintenance of the readout pixels can be effectively solved. The purpose of the aperture ratio.

On the other hand, in addition to the above concept, the aperture ratio of the read pixel of the touch liquid crystal display can be maintained, and the present invention also proposes that the aperture ratio can be increased by changing the circuit layout design in the read pixel. Graphic structure design. Please refer to FIG. 7(A), which is an isometric circuit diagram of a read-out liquid crystal display readout pixel according to a preferred embodiment of the present invention. In this embodiment, the read pixel structure of the touch-control liquid crystal display also includes a pixel unit 14 and a light sensing unit 12 . The pixel unit 14 and the general structure of a display pixel also includes a first switching element 101, the first switching element 101 further has a first drain a first data line D ₁ and the read out pixels Data _n Connected, a first gate G _{1 is} connected to a first gate line Gate _{n of} the read pixel, and a first source S ₁ , and a liquid crystal capacitor C _LC connected in parallel through the touch liquid crystal display And a storage capacitor C _ST connected to a common voltage of the read pixel. A portion of the light sensing unit 12 includes a second switching element 102 and a third switching element 103. The second switching element 102 has a second gate G ₂ connected to the first gate line Gate _n , a second drain D ₂ connected to the third switching element 103, and a second source S ₂ and The readout lines are connected. The third switching element 103 is used as a light sensing element for generating a photocurrent signal to be read by the control of the second switching element 102 and transmitted through the read line. The third switching element includes a third gate G ₃ and a third drain D ₃ connected to the common voltage V _com , and a third source S ₃ connected to the second drain D ₂ . . The read pixel can further reduce the area occupied by the circuit layout in the connection relationship of this embodiment, and the reason will be described in detail below.

Please refer to FIG. 7(B), which is a top view showing a detailed circuit layout of a touch panel liquid crystal display readout pixel structure. As shown in the figure, the read pixel 10 is composed of a first and a second gate line 51-1, 51-2 forming a boundary between the top and the bottom thereof, and a first and a second data line. 41-1, 41-2 form the boundary between the left side and the right side. Therefore, the data lines 41-1, 41-2 and the gate lines 51-1, 51-2 are arranged to cross each other to surround each other. The four boundaries of the pixel 10 are read out. In addition, a readout line 31 is disposed on a side closer to and parallel to the side of the first data line 41-1 to transmit the photocurrent signal generated in the readout pixel 10 to the touch liquid crystal display. A signal processing unit (not shown). The circuit layout of the readout pixel 10 is further provided with a common electrode line 25 having a lateral portion 251 for connecting the common electrode lines of two adjacent pixels and having a longitudinal portion 250. Arranging on the edge of a pixel electrode 105 of the touch-sensitive liquid crystal display and extending along the edge of the second data line 41-2 toward the first gate line 51-1, wherein the longitudinal portion 250 is exhausted It is possible to approach the second data line 41-2 to maintain the aperture ratio of the read pixel 10 as much as possible. In addition, the first switching element 101 in the interior of the pixel electrode 10 has a first drain 1013 connected to the first data line 41-1, and a first gate 1011 is disposed on the first gate. On the line 51-1, the first gate line 51-1 is used as the first gate 1011, and a first source 1012 is passed through the first connection hole (1601). The element electrodes 105 are connected. On the other hand, the second switching element 102 of the read pixel 10 uses the first gate line 51-1 as its second gate 1021, and the second source 1022 is directly related to the read. The outgoing line 31 is connected. In addition, the second switching element 102 further has a second drain 1023, which also serves as a third source 1032 of the third switching element 103 of the read pixel 10, so that the second switching element The third switching elements 102, 103 can be connected to each other. In addition, the third gate 1031 of the third component 103 and the third drain 1033 thereof are disposed on the other side, and the third gate 1031 and the third drain 1033 are respectively transmitted through a second and a first The third connection hole 1602, 1603 is connected to a transparent conductive (ITO) layer 160 of the touch liquid crystal display, as shown in FIG. 7D, so that the third gate 1031 and the third The pole 1033 is connected through the transparent conductive layer 160.

In addition, it should be further noted that the storage capacitor C _ST described above is composed of the pixel electrode 105, a dielectric layer (not shown), and the common electrode line 25; and the liquid crystal capacitor The C _{LC is} composed of the pixel electrode 105, a liquid crystal layer of the touch liquid crystal display (not shown), and a common electrode on the filter side of the touch liquid crystal display.

On the other hand, in a preferred embodiment of the present invention, the read pixel structure of the touch liquid crystal display can be further improved. Since the third switching element 103 as described in FIGS. 7(A) and (B) is in the circuit structure design of the readout pixel of the general touch type liquid crystal display, the photosensitive capability thereof is affected by the pixel electrode 105. Or the interference of the voltage applied to the transparent conductive layer 160. Therefore, the portion of the pixel electrode 105 covering the third switching element 103 must be removed before the third switching element can produce a normal photosensitive effect, such as 7 is shown in Figure (D). However, after the transparent conductive layer 160 covers the portion of the third switching element 103, the liquid crystal molecules near the third switching element 103 may be affected by the fringing electric field caused by the light sensing element. A situation in which light leakage occurs. Therefore, in such a case, the extension of the metal layer constituting the third gate 1031 of the third switching element 103 is used to shield the light leakage as shown by the metal layer 1032 in Fig. 7(D). . However, such an approach also affects the aperture ratio of the read pixel. In order to effectively overcome this problem, the structural design of the readout pixel 10 in the foregoing embodiment of the present invention can further avoid the extension of the gate metal layer by controlling the coverage area of the pixel electrode.

Please refer to FIG. 7(C) and FIG. 7(D), which respectively show a top view of a third switching element 103 included in a readout pixel structure shown in FIG. 7(B). The enlarged view and the cross-sectional view, wherein the third switching element 103 shown in Fig. 7(D) is a cross-sectional structure taken along the line AA' shown in Fig. 7(C). As shown in FIG. 7D, the third gate 1031 of the third switching element 103 is formed on a substrate 200, and the third source 1032 and the third drain 1033 of the third switching element 103 are formed. Formed on the third gate and having a gate insulating layer 210 therein to form an electrically insulated state between them. Further, the pixel electrode layer 105 is formed over the third source 1032, and also has a case where the insulating protective layer 220 is electrically insulated from each other. As can be seen from FIGS. 7(C) and 7(D), in order to reduce the extension of the gate metal layer, the pixel structure may extend through the pixel electrode 105 to the third source 1032 layer. Above, the area a as defined in Fig. 7(D) is used to solve the problem of light leakage of the liquid crystal layer. Similarly, the technique of extending the third source layer through the pixel electrode layer 105 can also be applied to the third gate and the third source. The cover of the pixel electrode can be used to avoid the electric field at the edge. This can reduce the width of the gate metal. Therefore, the aperture ratio of the readout pixel can be effectively maintained.

In summary, the present invention provides a liquid crystal display touch panel having an embedded third switching element to effectively overcome the lack of the conventional touch liquid crystal display. However, it should be noted that the above-described embodiments are merely illustrative of preferred embodiments of the present invention, but the scope of the present invention is not limited to the specific embodiments described above; and the present invention is known to those skilled in the art. Ren Shi is thinking about all kinds of modifications, but not as the person who wants to protect the scope of the application.

101. . . First switching element

102, 122. . . Second switching element

103, 121. . . Third switching element

35. . . Readout wire bond pad

45. . . Data line bond pad

55. . . Gate wire bond pad

12. . . Light sensing unit

33. . . Additional area

31,31-1...31-N. . . Readout line

10, 20. . . Read pixel

36. . . Peripheral trace

14. . . Pixel unit

1011. . . First gate

1012. . . First source

1013. . . First bungee

1022. . . Second source

1021. . . Second gate

1032. . . Third source

1023. . . Second bungee

1031. . . Third gate

1031. . . Third gate

51-1, 51-2. . . Gate line

41-1, 41-2. . . Data line

25. . . Common electrode line

251. . . Lateral part

250. . . Vertical part

105. . . Pixel electrode

1601,1602,1603. . . Connection hole

200. . . Substrate

210. . . Insulation

220. . . Insulating protective layer

160. . . Transparent conductive layer

1 is an equivalent circuit diagram of a light sensing element in a conventional touch liquid crystal display.

Fig. 2(A) is a view showing the arrangement of a bonding pad of a liquid crystal display in the prior art.

FIG. 2(B) is a schematic view showing the arrangement of the readout line 31 and its corresponding readout line bond pad 35 in a conventional touch liquid crystal display.

3(A) and 3(B) are respectively equivalent circuit diagrams showing a common pixel and a readout pixel of a touch liquid crystal display according to a preferred embodiment of the present invention.

4(A) and 4(B) show a preferred embodiment of the readout line layout in accordance with the present invention.

Fig. 5 (A) and (B) show the arrangement of the peripheral wiring of the touch liquid crystal display of the present invention and the read line bonding pad on the substrate.

Fig. 6(A) and Fig. 6(B) are schematic views respectively showing the arrangement of the peripheral wiring of the single layer and the arrangement of the multilayer peripheral wiring.

Figure 7(A) is a diagram showing an equivalent circuit diagram of a touch-sensitive liquid crystal display readout pixel according to a preferred embodiment of the present invention.

Fig. 7(B) is a plan view showing a detailed circuit layout of a touch panel type liquid crystal display readout pixel structure.

Fig. 7(C) and Fig. 7(D) are enlarged plan views and cross-sectional views, respectively, of a read pixel structure shown in Fig. 7(B).

12. . . Light sensing unit

14. . . Pixel unit

101,102,103. . . First, second, and third switching components

Gate _{n, n-1} . . . First, two gate lines

Data _n,n-1 . . . First, second data line

G ₁ , G ₂ , G ₃ . . . First, second, third gate

D ₁ , D ₂ , D ₃ . . . First, second, third bungee

S ₁ , S ₂ , S ₃ . . . First, second, and third source

C _LC . . . Liquid crystal capacitor

C _ST . . . Storage capacitor

Claims (9)

A liquid crystal display comprising: a gate line and a data line arranged to cross each other; a read line arranged in parallel with the data line; a first switching element having a connection to the gate line a first gate, a first drain connected to the data line, and a first source connected to a liquid crystal capacitor and a storage capacitor of the liquid crystal display, wherein the liquid crystal capacitor is connected to the storage capacitor a common voltage to the liquid crystal display; a second switching element having a second gate connected to the gate line, a second drain, and a second source connected to the sense line; A third switching element, which is a light sensing element, has a third gate and a third drain connected to a reference voltage at the same time, and a third source and the second drain are connected to each other. The liquid crystal display of claim 1, wherein the common voltage and the reference voltage are connected to each other. The liquid crystal display according to claim 1, wherein the liquid crystal capacitor is formed by stacking a pixel electrode of the liquid crystal display, a liquid crystal layer and a common electrode, and the storage capacitor is formed by the liquid crystal display. The pixel electrode, a dielectric layer, and a common electrode line are stacked. The liquid crystal display of claim 3, wherein the common electrode line further comprises a longitudinal structure, the edge of the pixel electrode is arranged and Extend along the data line. The liquid crystal display of claim 3, wherein the pixel electrode covers a portion of the third drain and the third gate. The liquid crystal display of claim 3, wherein the pixel electrode covers a portion of the third source and the third gate. A liquid crystal display comprising: a gate line and a data line arranged to cross each other; a read line arranged in parallel with the data line; a first switching element having a connection to the gate line a first gate, a first drain connected to the data line, and a first source connected to a pixel electrode of the liquid crystal display; a second switching element having a connection with the gate line a second gate, a second drain, and a second source connected to the read line; and a third switching element, which is a light sensing element, connected to the second drain The third switching element further includes a third gate, a third drain and a third source, and the second drain is connected to the third source, wherein the pixel electrode covers the third gate Part of it, but did not cover the third bungee. The liquid crystal display of claim 7, wherein the pixel electrode covers a portion of the third drain. The liquid crystal display of claim 7, wherein the pixel electrode covers a portion of the third source.