TW201126398A - Photosensitive element and liquid crystal display with the same - Google Patents

Abstract

A photosensitive element includes a first conductive line, a second conductive line, a third conductive line, a read switch, a charging switch and a light sensing element. A control terminal of the read switch is electrically connected to the first conductive line, and a second terminal of the read switch is electrically connected to the third conductive line. A control terminal of the charging switch is electrically connected to the first conductive line, and a first terminal of the charging switch is electrically connected to the second conductive line. The light sensing element is electrically connected between a first terminal of the read switch and a second terminal of the charging switch; wherein when the first conductive line turns on the read switch and the charging switch, the light sensing element generates a photocurrent to the third conductive line through the read switch according to a voltage of the second conductive line and a light intensity incident to the light sensing element. The present invention further provides a liquid crystal display.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch device, and more particularly to a light sensing element and a liquid crystal display including the same. [Prior Art] Liquid crystal displays are currently widely used display devices. With the maturity of touch screen technology, various mobile electronic devices, such as multimedia players, mobile phones, and personal digital assistants (PDAs) are almost equipped with touch. The LCD screen is designed to increase the convenience of use, wherein the optical touch screen detects the touch position by detecting changes in light intensity. Referring to FIG. 1 , a light sensing component 9 of a conventional optical touch panel is shown, which includes a data line 91 , a scan line 92 , a read line 93 , a common line 94 , and a read . The transistor 95 and a photo transistor 96 are taken. The photosensitive transistor % has different photocurrent outputs depending on the received light intensity. When the scanning line 92 receives a scanning signal and turns on the reading transistor 95, the photocurrent flows to the reading line 93. a processing unit (the position of the touch is determined according to the photocurrent when it is not green. ", the photosensitive photocell 96 of the middle is continuously subjected to the common line hill; = "using a long time operation causes photocurrent to appear; In view of this, it is necessary to propose a light sensing element, which does not

01442-TW / A09055-TW 201126398 Will be affected by the length of operation time. SUMMARY OF THE INVENTION The present invention relates to a light sensing element in which the photosensitive unit is prevented from being inferior in performance under long-term operation because the photosensitive unit does not continue to be subjected to a voltage for a long period of time. The invention further provides a liquid crystal display and a read pixel thereof, which can be combined with a pressing sensing structure to increase the change of the touch signal during the operation of insufficient light, thereby improving the operation sensitivity. The invention provides a light sensing component comprising a first wire, a second wire, a third wire, a reading switch, a charging switch and a photosensitive unit. The read switch includes a control end, a first end and a second end; the control end of the read switch is electrically connected to the first wire, and the second end of the read switch is electrically connected to the The third wire. The charging switch includes a control end, a second end and a second end; the control end of the charging switch is electrically connected to the first wire, and the first end of the charging switch is electrically connected to the second end wire. The photosensitive unit is electrically connected between the first end of the read switch and the second end of the charging switch; wherein when the first wire opens the switch and the charging switch, the salt light unit is according to the second The potential of the wire and the intensity of the light incident on the sensing unit generate a photocurrent through the read switch to the third wire. The invention further provides a reading element for a liquid crystal display, comprising a halogen crystal and a light sensing element simultaneously formed on an array substrate of the liquid crystal 01442-TW/A09055-TW 5 201126398 display. The light sensing component further includes a first wire, a second wire, a third wire, a read switch, a charging switch and a photosensitive unit. The read switch includes a control end, a first end and a second end; the control end of the read switch is electrically connected to the first wire, and the second end of the read switch is electrically connected to the The third wire. The charging switch includes a control end, a first end and a second end; the control end of the charging switch is electrically connected to the first wire, and the first end of the charging switch is electrically connected to the second wire . The photosensitive unit is electrically connected between the first end of the reading switch and the second end of the charging switch; wherein when the first wire turns on the reading switch and the charging switch, the photosensitive unit is according to the second wire The potential and the intensity of the light incident on the photosensitive light generate a photocurrent through the read switch to the second wire. The present invention further provides a liquid crystal display comprising a plurality of read halogens, an array substrate and a plurality of gate lines, a plurality of data lines, a plurality of common lines, and a plurality of third lines collectively formed on the array substrate. Each read element includes a halogen crystal and a light sensing component. The light sensing component further includes a read switch, a charge switch and a photosensitive unit. The read switch includes a control end, a first end and a second end; the control end of the read switch is electrically connected to the shunting gate line, and the second end of the read switch is electrically Raw connected to one of the third wires. The charging switch comprises a control end, a first end and a second end; the charging switch is controlled

01442-TW / A09055-TW 201126398 The control terminal of the % and § hai read switches is electrically connected to the gate line, and the first end of the charging switch is electrically connected to one of the common lines. The photosensitive unit is electrically connected between the first end of the reading switch and the second end of the charging switch; wherein the gate line electrically connected to the charging switch and the control end of the reading switch is turned on a reading switch and the charging switch, the photosensitive unit generates a photocurrent according to the potential of the common line electrically connected to the first end of the charging switch and the light intensity incident on the remote photosensitive unit The third wire electrically connected to the second end. In the light sensing element, the reading halogen element and the liquid crystal display of the invention, a discharge switch can be added to avoid accumulation of electric charge in the photosensitive unit, and a pressing sensing structure can be matched to increase the sensing sensitivity when the light is insufficient. The pressing sensing structure is formed on the opposite substrate of the charging switch and facing the charging switch, and the conduction of the charging switch can be changed by changing the distance between the charging switch and the pressing sensing structure. The state, in turn, changes the value of the photocurrent generated by the photosensitive unit. The pressing sensing structure may be a protruding structure in which at least one layer of spacers or color resists are stacked, and one electrode layer of the surface of the protruding structure is common. [Embodiment] In order to make the above and other aspects of the present invention The objects, features, and advantages will be more apparent, and will be described in detail below with reference to the accompanying drawings. In the description of the present invention, the same components are the same

01442-TW/A09055-TW 7 201126398 Say the table does not stipulate this. Moreover, only some of the components are shown in the various figures of the present invention and components that are not directly related to the description of the invention are omitted. Referring to Fig. 2, there is shown a circuit diagram of a photo sensing element according to a first embodiment of the present invention. The light sensing component 10 includes a first wire 111, a second wire 112, a third wire 113, a read switch 121, a photosensitive unit 122, and a charging switch 123. The reading switch 121 and the charging device The switch unit 113 can be, for example, a thin film transistor. The photosensitive unit 122 can be, for example, a thin film transistor, a photodiode or a light sensitive resistor. The first wire 111 is configured to control the opening and closing of the read switch 121 and the charging switch 123 to provide a potential for driving the photosensitive unit 122, and the third wire 113 is used for reading a The photocurrent Ic is transmitted to the processing unit 8 via the read switch 121 and the third wire 113 for analysis. The photocurrent Ic is generated based on the potential of the second wire 112 and the intensity of light incident on the photosensitive unit 122. The present invention achieves performance degradation and reduces the generated photocurrent Ic by increasing the charge switch 123 to prevent the photosensitive unit 122 from being continuously subjected to the potential connected to the second wire 112. The read switch 121 includes a control end 121a, a first end 121b and a second end 121c. The control end 121a is electrically connected to the 0414-TW / A09055-TW 8 201126398 on the first lead 111 ' The second end 121c is electrically connected to the third wire 113. The first end 121b and the second end 121c can be divided into other drains and sources. The charging switch 123 includes a control end 123a, a first end i23b and a second end 123c. The control end 123a is electrically connected to the first wire 111, and the first end 123b is electrically connected to the second end. The wire 丨丨 2, wherein the first end 123b and the second end 123C can be divided into other drains and sources. The photosensitive unit 122 is coupled between the first end 121b of the read switch 121 and the second end 12 of the charging switch 123. For example, when the photosensitive unit 122 is a thin film transistor (TFT), it includes a control. The terminal 122a, the first end 122b and the second end 122c' are electrically connected to the first end; the second hole is electrically connected to the second end mc of the charging switch 123. The two ends 122c are electrically connected to the first end 121b of the read switch i2i and rush to the first end 122b and the second end 122. Can be divided into other immersions and sources. It can be understood that the above (four) Ming system assumes that the photosensitive film 122 is a thin film transistor to illustrate the light sensing device process of the present invention; when the photosensitive single core 22 is a photodiode or a photoresistor, it may not have three Connections. When the first wire 111 simultaneously turns on the read opening 121 and ; =: the potential connected to the second wire 112 is sensed? The unit 122 is configured to cause the photocurrent to be generated by the read switch 121 to the third wire 113 in accordance with the light intensity. Call

01442-TW / A09055-TW 201126398 When the light sensing element 1 is applied to a read pixel of a liquid crystal display, each component of the light sensing element 10 is formed on a thin film transistor included in the liquid crystal display On the array substrate (10), the first wire lu is, for example, a gate line of the array or a wire controlled by a separate device, and the second wire 112 can be a site on the array substrate. The common line '3' may be, for example, a data line on the substrate or an additional guide =. Just small + praise

The light sensing element 10 of the ΗBeiyi I is applied to the layout of the liquid crystal display, and the components of the light sensing element 1 are formed on an array substrate 30, and the 昼 is read. The illuminating element 13 further includes a shading element 13 shielding the first wire lu and the third wire 1. Above, to cover the light leakage at the edge of the element. In the present invention, in order to avoid affecting the aperture ratio of the read sputum, the read opening 121 and the charging switch 123 are preferably formed on the array substrate 3 overlapping the first wire m. 〇上. It can be understood that some of the components are omitted in the reading element in the third drawing, for example, the wire and the pixel transistor coupled to the halogen electrode are omitted. One of the mouth, , *,, _ team day display displays the circuit diagram of read〇ut pixel. An in-line optical touch liquid crystal display comprises a plurality of general pixels (ie, pixels that do not include light sensing elements) and a reading element (ie, includes a light sensor element)

01442-TW/A09055-TW 201126398 昼 ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) 01 01 01 01 01 01 01 01 01 01 01 The higher the ratio, the more the sensing resolution can be obtained; wherein the structure of the general halogen is a conventional technique, and thus will not be described again. In FIG. 4A, one of the readings of the present invention includes a first gate line Gn, a second gate line, a data line %, a halogen crystal 21 and a light sensing element. Formed on an array substrate, in this embodiment, the halogen transistor 21 is electrically connected to the light sensing element 1 to different gate lines. The halogen crystal 2 includes a control end 21a, a first end 2lb and a second end 21c. The control end 21a is electrically connected to the first gate line, and the first end 21b is electrically connected. At the data line %, the second end 21. Electrically connected to - liquid crystal capacitors and a storage capacitor & The light sensing element U is electrically connected between the second gate line g, the first wire 112 and the second wire 113, wherein the second wire h2 can be a plurality of common lines included in the array substrate In one of the plurality of wires 113, the third wire 113 may be a plurality of data lines included in the array board (for example, but not limited to, adjacent to the resource (four) DJ-data line) or a plurality of separate read lines. one. The connection between each element of the cough sensing element 1 and the second gate line Gn+1, the second wire 112 and the third wire 113 is similar to that shown in FIG. 2, that is, the first wire m is replaced with the second wire. The reason is not repeated here.

01442-TW / A09055-TW 11 201126398 In Fig. 4B, one of the present invention reads a pixel 2, which also includes a first gate line Gn, a second gate line Gn+i, a data line, and a The halogen crystal 21 and the light sensing element i are formed on an array substrate. In this embodiment, the halogen transistor 21 is electrically connected to the light sensing element 10 to the same gate line, for example. It is the gate line Gn, and other components are connected in a similar manner to FIG. 4A, and thus will not be described again. It can be understood that the array substrate of the liquid crystal display comprises a plurality of gate lines and data lines alternately formed on the germanium array substrate, and the gate lines and Gn+1 are two of the gate lines and the data lines Dn is one of these data lines. Referring to Figures 5A and 5B, there is shown a light sensing element of a second embodiment of the present invention. The photo sensing element 10' further includes a fourth wire 114 and a discharge switch 124 for discharging the photosensitive cell 122 to avoid accumulation of electric charges, wherein the photo sensing element 10' is compared with the first embodiment. The first wire m, the second conductive wire 112, the third wire 113, the reading switch 12, the photosensitive unit 122 and the charging switch 123 are connected in the same manner as the first embodiment, and thus will not be described again. The discharge switch 124 can be, for example, a thin film transistor, and includes a control terminal 124a, a first end 12 and a 124C'. The first end 124b and the second end 124C can be divided into other drains and sources. The control terminal 124a is electrically connected to the fourth wire 114. The first end 124b is electrically connected to the control end 122a and the first end 122b of the photosensitive unit 122, and the second end (4) is electrically connected to Wire (1). When the material is measured,

01442-T WIA09055-TW 201126398 η When the reading element is applied to a liquid crystal display, the components of the light sensing element ι are formed on an array substrate. Fig. 5A is a view showing the first wire lu simultaneously opening the reading switch 121 and the charging opening 123, and the third wire (1) reads out the photocurrent k generated by the photosensitive unit 122 to sense the light intensity. At this time, the fourth wire 14 does not turn on the discharge switch 124, so the discharge switch 124 does not function at this time. Fig. 5B shows a schematic view of the fourth wire 114 opening the discharge switch 124. At this time, the first wire iu has a low potential, for example, -7 volts, and the charge that closes the read switch 121 and the charge switch 123' accumulated in the photosensitive cell 122 can be discharged to the first during this period. Wire U1. It can be understood that the optical sensing element 10' of the second embodiment of the present invention can also be applied to a reading element of a liquid crystal display, as shown in FIG. 4A and FIG. 4B, 'the first wire U1 at this time. And the fourth wire 114 can be two gate lines, for example, two adjacent gate lines Gn, Gn+1. According to another embodiment of the present invention, in order to increase the sensing sensitivity of the photo sensing element 10 or 10 at low light intensity, a pressing sensing structure may be further disposed above the charging switch 123. For example, when the light sensing element 10 or 1 is formed on the array substrate 3G of a liquid crystal display, the sensing structure is formed on one of the alignment substrates of the array substrate 30.

01442-TW / A0905 5-TW 13 201126398 Please refer to FIGS. 6A and 6B, which show a cross-sectional view taken along line - in FIG. 3, which includes an array substrate 30 and a pair of substrates 40, and the charging switch 123 is formed. The pressing sensing structure 41 faces the array substrate 30 and is formed on the opposite substrate 40 with respect to the charging switch 123. In one embodiment, the charging switch 123 includes, for example, a gate layer G, a gate insulating layer 1231, a channel layer, a doping layer 1233, a source layer §, a gate layer d, and a protective layer 1234. On the array substrate 3 (), the material and formation manner of each layer are conventional techniques, so that the structure of the sensing structure 41 can be stacked by a plurality of layers of photoresist to form a large structure or A spacer is formed by an electrode layer 411. For example, in FIGS. 6A and 6B, the pressing sensing structure 41 is not formed by stacking two layers of color resists R, G, and B. Sense, J, ". The surface of the structure 41 is further formed - the electrode layer 411. According to this structure, the conduction state of the channel layer 1232 is affected by the voltage of the gate layer G and the electrode layer 411, which affects the 6A. The figure shows that the opposite substrate 4 is not pressed by an external force. The view of the electrode layer 411 and the charging switch 123 is, for example, dl. FIG. 6B shows that the opposite substrate 4 is pressed by an external force. In the cross-sectional view, the distance between the electrode layer and the charging switch 123 is changed to d2, for example. At this time, the electrode 4 ^ = electricity = The conduction state of the channel layer 1232 will be lowered. Therefore, when the hand or the L pen is pressed against the light sensing element (7) or above, the light intensity of the photosensitive unit 122 is reduced and reduced.

01442-TW / A09055-TW 201126398 The generated photocurrent Ic, while the distance between the electrode layer 411 and the charging switch 123 is shortened to further reduce the conduction state of the charging switch 123 to lower the driving voltage of the photosensitive unit 122, and The generated photocurrent IC is further reduced. In this embodiment, the multiplication of the effects of the two can make the change of the touch number generated when the light sensing element is touched or 〇1 is more obvious, so as to increase the touch sensitivity of the liquid crystal display. It can be understood that the touch signal can be a current or voltage signal 'converted according to the photocurrent 1c or the photocurrent Ic. In addition, the detailed implementation of the press sensing structure 41 can be referred to the contents of the disclosure of the Japanese Patent Publication No. 200910168. As described above, since one of the photosensitive sensing structures in the conventional light sensing structure is continuously subjected to a voltage during operation, the photocurrent generated by the photosensitive unit is attenuated under long-term operation, and φ causes a touch event. The resulting photocurrent changes are less noticeable, thus reducing operational sensitivity. The present invention avoids the problem that the photosensitive unit (e.g., Figures 2, 5A and 5B) continues to be subjected to voltage effects by the addition of a charging switch. In addition, the present invention can also prevent charge accumulation in the photosensitive unit by adding a discharge switch (such as Figures 5A and 5B); and can cooperate with a pressing sensing structure (such as Figures 6A and 6b) to increase light deficiency. Sensing sensitivity. Although the present invention has been disclosed in the foregoing embodiments, it is not intended to limit the present invention, and any of the technical fields of the present invention are

01442-TW/A09055-TW 15 201126398 Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. 01442-TW/A09055-TW 16 201126398 [Simple description of the drawing] 'The first figure shows a conventional salty, and the second figure shows the circuit diagram of the first actual part of the present invention. Figure. The light sensing element of the example is shown in Fig. 3 which shows the light sensing element of Fig. 2, and Fig. 4A shows a schematic view including the first embodiment of the present invention. One of the circuit diagrams for reading pixels. Detecting component

Fig. 4B is a diagram showing another circuit diagram for reading a pixel including the first embodiment of the present invention. Sub-measurement element: FIG. 5A shows a light "bump diagram of the second embodiment of the present invention, wherein the photo-sensing element operates on the second embodiment of the present invention. The measuring component is operated on the lower side of the drawing: Figure 3-6 shows the sectional view of the line, and the formula. The pressure sensing knot is formed in a pair of the charging switch: in the middle - according to Figure 6B The other substrate along the line 6_6, line 6_6 in Fig. 3 is displayed. The opposite substrate is pressed by an external force.

[Main component symbol description] 10 ' l〇f light sensing element 111 112 second wire 113 114 fourth wire 121 121a read switch control terminal 12lb 121c read switch second end 122 122a photosensitive cell control terminal 122b 01442-TW/A09055-TW First wire third wire reading switch read switch first end photosensitive unit photosensitive unit first end 201126398 122c photosensitive unit second end 123 123a charging switch control terminal 123b 123c charging switch The second end 1231 1232 channel layer 1233 1234 protective layer 124 13 shading element 20, 20, 21 halogen crystal 30 40 to south substrate 41 411 electrode layer 8 Gn, < Gn+1 gate line Dn Clc liquid crystal capacitor Cst Ic Photocurrent R, G, B 9 Light sensing element 91 92 Scanning line 93 94 Common line 95 96 Photoelectric transistor charging switch Charging switch First end gate insulating layer Doped layer Discharge switch Reads the pixel array substrate press Sensing structure processing unit data line storage capacitor photoresist data line read line read transistor 01442-TW/A09055-TW 18

Claims (1)

201126398 VII. Patent application scope: 1. A light sensing component, comprising: a first wire; a second wire; a third wire; - only the code, a first end, and one of the first ends of the switch, the control terminal of the switch is electrically connected to the first wire. The second end of the switch is electrically connected to the third wire; Right Ray PJ. l * The first end and the first - charging switch 'includes a control end'. The control end of the charging switch is electrically connected to the first wire, and the first end of the electronic charging switch is electrically connected. The second wire; and a photosensitive unit electrically connected between the first end of the read switch and the second end of the charging switch; wherein when the first wire turns on the read switch and the charging switch The photosensitive unit is based on the second wire The potential and the intensity of the light incident on the photosensitive unit produce a photocurrent: through the read switch to the third conductor. 2. According to the scope of the patent application! The photosensitive sensing element, wherein the photosensitive unit is a thin film transistor, a photodiode or a photoresistor; the first wire is a gate line; the second wire is a common line; a data line; the read switch and the charging switch are a thin film transistor. According to the optical sensing component of claim 1, further comprising a fourth wire and a discharge switch, the discharge switch comprising a control end, a first end and a second end, wherein the control end of the discharge switch is ο 1442-TW / Α09055-Τ W 19 201126398 is electrically connected to the fourth wire, the first end of the discharge switch is electrically connected to the second end of the charging switch, and the second end of the discharge switch is electrically connected Connected to the wire; the + the first wire and the fourth wire are two gate lines. 4. The light sensing device of claim i, wherein the charging switch is formed on an array substrate, the pair of opposite substrates, and a protruding structure is formed on the opposite substrate from the opposite substrate Extending toward the charging switch and forming an electrode layer on the surface of the protruding structure, wherein the photocurrent value generated by the element is changed by changing a distance between the charging switch and the electrode layer to change a conduction state of the charging switch; wherein the protruding structure is == Object or color resistance is formed. 5. A read pixel for a liquid crystal display, comprising: a pixel transistor formed on an array substrate included in the liquid crystal display and a light sensing element formed on the array substrate, the light perception The measuring component further comprises: a first wire; a second wire; a third wire; a read switch comprising a control end, a first end and a second end, the control end of the read switch is electrically Connected to the first wire, the second end of the read switch is electrically connected to the third wire; 01442-TW / A09055-TW 20 201126398 A charging switch includes a control end, a first end and a a second end, the control end of the charging switch is electrically connected to the first wire, the first end of the charging switch is electrically connected to the second wire; and the photosensitive single device is electrically connected to the reading Taking the first end of the switch and the second end of the charging switch; wherein when the first wire turns on the reading switch and the charging switch, the photosensitive unit is incident on the photosensitive unit according to the potential of the second wire Light intensity produces a photocurrent The read switch is passed to the third wire. 6. According to the scope of the patent, the photosensitive element 7G is a thin film transistor, a thin film transistor, a 91-4 μα-i, a nine-pole body or a photoresistor; the first wire is on the array substrate. One of the polarity lines; the first is a common line on the array substrate; the read switch, the charging switch and the halogen transistor are a thin film transistor. The reading of the element, wherein the light sensing ^ fourth wire, the data line and a discharge of the discharge switch comprise a control end, a (10) end is electrically connected to the two guides: 4 discharge switch The two ends are electrically connected to the second interpolar line; the fourth lead is the array substrate and the data; the system is electrically connected to the first lead: between the sense lines or electrically connected to the fourth The wire and the data line 01442-TW/A09055-TW 21 201126398 8. The reading pixel according to item 5 of the patent application scope, further comprising a pair of facing substrates facing the array substrate, the protruding substrate forming a protruding structure Extending the photosensitive cell from the opposite substrate toward the charging switch and an electrode layer formed on the surface of the protruding structure by changing a distance between the charging switch and the electrode layer to change a conduction state of the charging switch The photocurrent value; wherein the protruding structure is formed by a spacer or a color resist. 9. The reading element according to claim 5, wherein the reading switch and the charging opening relationship are formed on the array substrate overlapping the first wire; the reading pixel further comprises a shading element Formed above the first wire. 10 - A liquid crystal display comprising: an array substrate; a plurality of gate lines formed on the array substrate; a plurality of k-th wires 'crossing the § 荨 荨 gate line formed on the array substrate; a plurality of common lines formed on a plurality of third wires formed on the substrate; and a plurality of read halogens, each read element further comprising: a halogen crystal; and a light sensing element, the light sensing element The method further includes: a read switch comprising a control end, a width-cloth end and a second end, wherein the control end of the read switch is electrically connected to the gate of the 01442-TW/A09055-TW 22 201126398 The second end of the read switch is electrically connected to one of the third wires; a charging switch includes a control end, a first end and a second end, the charging switch The control terminal is electrically connected to the gate line electrically connected to the control end of the read switch, and the first end of the charging switch is electrically connected to one of the common lines; and , electrically connected to the read open a first end of the charging switch and a second end of the charging switch; wherein the charging switch and the charging switch electrically connected to the charging switch and the control end of the reading switch open the reading switch and the charging switch The light is generated according to the potential of the common line electrically connected to the first end of the charging switch and the light intensity generated by the photosensitive unit is electrically connected to the second end of the read switch through the read switch The third wire. The liquid crystal display according to the patent application scope, wherein the photosensitive sheet 7C is a thin film transistor, a photodiode or a photoresistor, the read switch, the charging switch and the halogen transistor are one Thin film transistor. 12. The liquid crystal display according to claim 1, wherein the light sensing element further comprises a discharge switch, the discharge switch 2 includes a first end of the control end and a second end, wherein the discharge switch is clamped The end is electrically connected to another gate line, which is different from the reading; the gate line electrically connected to the control terminal is closed, and the first end of the discharge switch is 01442-TW / A09055'TW 201126398 The second end of the discharge switch is electrically connected to the (four) pole line of the control electrical connection of the read switch; the pixel transistor is electrically connected to the read switch The gate line electrically connected to the control terminal and the resource: the line or the adjacent gate line electrically connected to the gate line electrically connected to the (four) end of the read port and the data Line between. 13. The liquid crystal display according to claim 1, further comprising a pair of facing substrates facing the array substrate, wherein a protruding structure is formed on the opposite substrate from the opposite substrate toward the charging switch and an electrode layer is formed. a surface of the protruding structure, wherein the photocurrent value generated by the photosensitive unit is changed by changing a distance between the charging switch and the electrode layer to change a conduction state of the charging switch; wherein the protruding structure is formed by a spacer or a color Resistance formed. 14. The liquid crystal display of claim 1, wherein the read switch and the charge-on relationship are stacked on the array substrate in parallel with the gate lines. 01442-TW/A09055-TW 24