TWI377547B - Driving circuit for input display - Google Patents

Description

1377547 IX. Description of the invention: [Technical field to which the invention pertains] The invention relates to a driving circuit of a display, in particular to a circuit for reading a pixel and a driving method thereof. [Prior Art] Crystal = Non-jing The material is photosensitive, and because the process of designing the photosensitive element of the material is completely compatible with the known active moment = actlveMatrix liquid crystal display process, the seven-type amorphous light-emitting element is used as the input display. The wheel-in display compared to the 2-touch panel is more cost-competitive. In addition, the input display with the touch panel will be reduced by at least 2% by the touch panel; and the light transmittance of the input display using a few non-salt light is only == in each pixel, the device and its associated read line wiring method. Therefore, it is apparent that the art has an input type display type in which an amorphous stone photographic element is embedded. Right to live in two ways, 'there are usually two typical designs used to apply amorphous smear π-pieces to input displays. Please refer to the first diagrams (A) and (8), which are diagrams showing a charge-type photosensitive unit having an amorphous steel photoreceptor and a current having an amorphous cerium photosensitive element in the input display. The equivalent circuit diagram of the type photosensitive unit. As shown in the first figure (Α), the charge type photosensitive unit 10 includes a photosensitive film transistor u, a switching thin film transistor 12, and a capacitor C. As is apparent from the Fig. (A), 5 1377547 the switching thin film transistor 12 is controlled to be turned on and off by an input SW. When the switching thin film transistor 12 is switched to the on state, current will be charged to the capacitor C through the read line. Subsequently, when the switching thin film transistor 12 is switched to the off state, the electric charge stored in the capacitor c will be discharged through the photosensitive thin film transistor 11. Then, when the switching thin film transistor 12 is once again switched to the on state, the current passing through the read line will again charge the capacitor C to return the current to the original state of charge. Therefore, by recharging the charge into the capacitor 芎 C, we can estimate the amount of charge neutralized by the photosensitive film transistor, and the amount is proportional to the amount of light received by the photosensitive film transistor. As for the current-type photosensitive element 2A shown in the first figure (B), it comprises a photosensitive film transistor 21 for generating a photosensitive current, the magnitude of which is proportional to the amount of light received by the photosensitive film transistor. A switching thin film transistor 22 is controlled to turn on and off through an input SW to further control the transfer of the photosensitive current to the read line. In the current-type photosensitive element 2, the photosensitive current value described by Φ is directly read out from the reading line. It should be noted that the photosensitive element, whether of the charge type or the current type, uses the photosensitive (electrical) (4) U, 21 to generate the photosensitive material, and controls the reading of the photosensitive signal through the switching thin film transistors 12, 22. However, the current characteristic curve of the photosensitive film transistor 1 in a biased state and a reverse biased state is asymmetrical. Please refer to the second figure, which is a graph showing the characteristics of a photosensitive film transistor in the case of a bright state and a dark state. As shown in the second figure, when the photosensitive film transistor is in a bright state, the photosensitive current curve generated by it will be shown as curve 12 of the figure 1377547, where the curve I2 includes the forward bias of Vgs&gt; The state (also referred to as the current on state) and the reverse bias state (also referred to as the current off state) of Vgs &lt;0. When the photosensitive film transistor is in a dark state, the resulting photosensitive current curve will be as shown by the curve in the figure, where the curve I, including the Vgs&gt; 〇 biased state (also called current on (on) Current), and a reverse bias state (also referred to as a current off state) of vgs<〇. Generally, for a current-type photosensitive unit, the photosensitive film transistor should be operated in a biased state in order to alleviate the signal delay phenomenon caused by the parasitic resistance or parasitic capacitance effect of the read line. A read line 103 is disposed at the first and passes through the entire read pixel, and between the line Gn-1 and the second gate line Gn. In addition, although the above-mentioned parasitic resistance and parasitic capacitance effect can be avoided by operating the photosensitive film transistor in a biased state, the reading element of the input display still exists with the reading element. Voltage control related issues. Referring to Fig. 3(A), which is an equivalent circuit diagram showing a driving circuit of an input type display in the prior art. As shown in the third diagram (A), the driving circuit 1A in each of the read pixels includes a first gate line Gn-i and a second gate line g„' and a first data line Dm. And the second data line Dm and the 5H first and second gate lines Gn | Gn are arranged to intersect to form the read pixel of the input display. In addition, in each read pixel, between the second data line IV, Dn, the circuit layout of the common line Cp-1 disposed in the first gate can still be divided into two parts, that is, Pixel unit 101

On the other hand, in each of the read pixels, the pixel 377547 2 101 and the photosensitive element 1G2 are electrically connected to the common line Ch, and the == common line Cpi' - a reference voltage can be supplied to the pixel The component 'carrying electric cell cst is also pulled through the common line Cp to drive the photosensitive unit (10) to generate a photocurrent. In addition, from the third figure (= imi can go to the road. Xuanzang single &amp; 1〇1 has a pixel thin film transistor 〇11' the halogen film transistor 1〇11 with one of the wheel-in display The halogen electrode is connected (not untwisted) and the pixel electrode is shown with the input; the common electrode (not shown) of the device constitutes the liquid crystal capacitor jt of the input display. In addition, the third figure The other capacitor in (4), that is, the storage electric grid Cst, is composed of the aforementioned pixel electrode and the common line Cpi.

Please refer to the third diagram (8), which shows the operation of the drive signal of the drive circuit of the third diagram (A). As shown in the third figure (8)t, when the first gate, Gn-, provides a signal having a high level, the halogen film transistor 1〇11 of the pixel unit 1〇1 is switched to the on state. Therefore, a signal from the first data line IV is input to the pixel unit 1〇1 to generate a pixel voltage VPixel, so that the pixel provides a corresponding gray scale value. At the same time, a switching thin film transistor 1021 of the photosensitive unit 102 is also switched to an on state, because a photosensitive current generated by a photosensitive thin film transistor 1 22 is output through the switching thin film transistor 1021. The read line 103. However, since the common voltage supplied from the common line Cm is affected by the parasitic resistance value, the voltage difference between the pixel voltage and the common voltage fluctuates. When the first gate line GnM provides a low level k, the halogen film transistor 1〇1丨 and the switching thin film transistor 1021 will be switched to the off state, and thus no longer senses. Photoelectric 1377547 stream. Since the photocurrent disappears, the common voltage supplied from the common line Cm will return to a stable voltage value. However, the pixel voltage will be affected by the coupling effect, so that the gray scale voltage value of the pixel element 101 is also affected. In view of the above, the applicant's gray-scale voltage value of the input display is often affected by the fluctuation of the shared voltage value. After careful testing and research, and a perseverance, the applicant finally conceived the case of "an input display". Drive circuit and method thereof" to overcome the above-mentioned lack of conventional input display. The first aspect of the present invention provides a driving circuit for an input display, which includes a first data line and a second data line, which are arranged in parallel with each other; a first gate line and a second gate line are arranged parallel to each other and intersect with the first data line and the second data line to thereby form a pixel of the input display; a common line) disposed between the first gate line and the second gate line; a first switching element having a first gate electrode connected to the first gate line; and a second switching element having a a second gate electrode is connected to the second gate line; and a third switching element is connected between the common line and the second switching element, and the third switching element is operated in a biased state, wherein The first gate line and the second gate line are sequentially operated such that the first switching element and the second switching element are sequentially driven by the first gate line and the second gate line. According to the above concept, the first switching element further includes a first 汲 1377547 electrode connected to the first data line, and a first source electrode connected to the common line. According to the above concept, the driving circuit further includes a storage capacitor, and the first source electrode is connected to the common line through the storage capacitor. According to the above concept, the driving circuit further includes a liquid crystal capacitor, and the first source electrode is connected to a common electrode through the liquid crystal capacitor. According to the above concept, the driving circuit further includes a read line disposed beside the second data line and passing through the pixel of the input display. According to the above concept, the second switching element further includes a second anode electrode and a second source electrode connected to the read line. According to the above concept, the third switching element further includes a third gate electrode, a third drain electrode, and a third source electrode, wherein the third gate electrode and the third drain electrode are connected to the third gate electrode The line is shared and the third source electrode is connected to the second drain electrode. According to the above concept, the third switching element further includes a third gate electrode, a third drain electrode, and a third source electrode, wherein the third gate electrode is connected to the third source electrode The second drain electrode is connected to the common line. Another idea of the present invention is to provide a driving circuit for an input display, comprising a first data line and a second data line, which are arranged parallel to each other; a first gate line (gate line) and a second gate line, which are arranged parallel to each other and intersect with the first number 1377547 data line and the second data line; a pixel circuit comprising a photonic crystal, the pixel The transistor has a first gate electrode connected to the first gate line; and a photosensitive circuit, wherein the photosensitive circuit further comprises a switching transistor, wherein the switching transistor has a second gate electrode connected to the second a gate line; and a photosensitive transistor connected to the switch transistor and operating in a forward biased state. According to the above concept, the first gate line and the second gate line are sequentially operated such that the pixel transistor and the switch transistor are sequentially driven by the first gate line and the second gate line. According to the above concept, the driving circuit further includes a common line disposed between the first closed line and the second gate line, wherein the pixel circuit and the photosensitive circuit are both connected to the common line. According to the above concept, the halogen crystal further includes a first drain electrode connected to the first data line and a first source electrode. According to the above concept, wherein the driving circuit further includes a storage capacitor and the s-first source electrode is connected to the sharing through the storage capacitor according to the above concept, wherein the driving circuit further includes = and (4) the -_ electrode passes The liquid crystal capacitor connection is shared by the present invention in which the drive circuit further includes a read line set and passes through the input display. 4 conceived 'where the off transistor further comprises - a second stepless 1377547 source electrode' wherein the source electrode is connected to the reading according to the above concept, wherein the photosensitive transistor further comprises an electrode, a third drain electrode and a third source electrode, wherein the third gate electrode and the third electrode are connected to the conjugate, and the third electrode is connected to the second electrode. / One",

According to the above concept, the third switching element further includes a third gate electrode, a third drain electrode, and a third source electrode, wherein the first gate electrode and the third source electrode are connected to the third source electrode The second stepless electrode is connected to the common line. The invention will be further understood by the following drawings and detailed description of specific embodiments:

Electrode and a first line. Referring to Fig. 4(A)', there is shown an equivalent circuit diagram of a driving circuit of an input type display according to a first embodiment of the present invention. As shown in the fourth figure (A), the s-the-synchronous driving circuit 2 includes the first gate line Gn-丨 and the second gate line 每 in each of the read pixels, and a first data line team ^ And a second data line D» is interleaved with the first and second gate lines Gn...^ to form the read pixel of the wheel-in display. In addition, in each of the read pixels, a read line 203 is disposed between the first and second data lines Dn_, ^, and a common line Cm is disposed on the first gate Gn_. , between the second gate line Gn. On the other hand, the circuit layout in each of the read pixels can be divided into two parts, that is, a unitary unit 201 and a photosensitive unit 202. In more detail, the halogen unit 201 further includes a halogen film transistor 12 1377547 and the opening time of the switching film transistor 2021 is asynchronous, thereby avoiding the problem of floating of the common voltage derived by using the common line. . The above conclusion can be further explained as follows with reference to the fourth diagram (B). • Please continue to refer to the fourth diagram (B), which shows the operation status of the drive signal of the drive circuit according to the fourth diagram (A). As described above, since the pixel thin film transistor 2011 and the switching thin film transistor 2〇21 are sequentially driven by the first gate line and the second gate line Gn, respectively, when the pixel is thin _ film ^ When the crystal 2011 is driven by a first high level signal of the first gate line Gn_, a pixel voltage Vpixei (shown on the figure) of the input display will be generated to provide a gray scale for the pixel. When the switching thin film transistor 2021 is driven by a second high level signal of the second gate line, since the common voltage value of the common line is higher than the voltage of the read line 2〇3, a light receiving current The photocurrent signal will be generated and read via the read line. Therefore, when the Tianshu switch thin film transistor 2021 is turned off, the pixel thin film transistor 2011 has been closed before the second gate line Gn is turned on, so that between the pixel voltage and the common voltage The power difference will no longer be affected by the floating of the shared voltage value. It should be noted that when the halogen thin film transistor 2011 is driven by the first high level signal of the first gate line Gn-, the voltage value of the pixel element is gradually approached to the first data line. The voltage level of a control data signal provided by Dm is as shown in the fourth figure (8). However, the voltage difference between the pixel voltage used to provide a gray scale value and the common voltage is determined by a voltage level between the control data signal and a function between the common voltages. 1377547 4. Referring to Fig. 5(A), there is shown an equivalent circuit diagram of a driving circuit of an input type display according to a second embodiment of the present invention. Compared with the driving circuit 200 of the first embodiment in the foregoing fourth embodiment (A), the driving circuit 300 according to the second embodiment of the present invention is almost completely identical in structure to the driving circuit 200, except that The second gate electrode G2 of the switching thin film transistor 2021 is connected to the first gate line Gh, and the first gate electrode G! of the pixel thin film transistor 2011 is connected to the second gate line Gn. That is to say, in the structural relationship, the driving circuit 300 is identical to the driving circuit 200 except that the driving order of the first and second gate lines is just the opposite. However, although the driving circuit 200 and the driving circuit 300 are not different in structure, the driving signal operation state of the driving circuit 300 may be slightly different from that of the driving circuit 200. Referring to the fifth diagram (B), it shows the operation state of the driving signal according to the driving circuit according to the fifth diagram (A). As shown in the fifth diagram (B), since the driving signals affecting the opening and closing of the halogen thin film transistor 2011 and the switching thin film transistor 2021 are different in order, when the Vpixei voltage is written, it is driven. It is the photosensitive unit of the previous column that reads the pixels. The photocurrent is provided by the common line of the previous column. Therefore, when the pixel voltage is written, the symmetrical common line potential does not shift; The voltage difference between the voltage and the common voltage can still be stabilized without being affected by the floating voltage value. Please continue to refer to the sixth drawing, which is an equivalent circuit diagram showing a driving circuit of an input type display according to a third embodiment of the present invention. Compared with the driving circuit 200 of the first embodiment in the foregoing fourth embodiment (A), the root 15 1377547 is similar in structure to the driving circuit 200 in the third embodiment of the present invention. The component is composed of a third gate electrode G3 and a third source electrode S3 of the third photosensitive film transistor 2022 being a second drain electrode 〇2 connected to the switching film transistor 2021. A third drain electrode &amp; of the photosensitive film transistor 2022 is connected to the common line. Similar to the structure of the input type display driving circuit 400 of the third embodiment of the present invention, they are particularly suitable for the case where the common voltage of the common line CpH is lower than the voltage of the reading line 203. The driving circuit 400 has the same advantages as the foregoing driving circuit structure, and the driving circuit 400 is sequentially driven by the first gate line Gh and the second gate line q, respectively, because the pixel film transistor 2011 and the switching film transistor 2021 are sequentially driven. Therefore, when the halogen thin film transistor 2011 is driven by a first high level signal of the first gate line Gw, a pixel voltage Vpixel of the input display will be generated to provide a gray scale for the pixel. Value; and when the halogen film transistor 2〇11 is in the driving state and the 5H switch film transistor 2〇2 1 is driven by a second high level signal of the second gate line Gn, because of the sharing of the common line The voltage value is lower than the voltage of the read line 203, so a light-sensitive current will be generated and flow into the common line Cpn via the read line. Therefore, when the switching thin film transistor 2〇21 is turned off, the 'Shailan thin film transistor 2011 has already been turned on and off at the second gate line Gn, so that the pixel voltage and the common voltage are The voltage difference between them is no longer affected by the floating of the shared voltage value. Continuing to refer to the seventh figure, which is an equivalent circuit diagram of a driving circuit of an input display according to a fourth embodiment of the present invention, and a driving operation of the third embodiment of the present invention. In comparison with the circuit shed, the driving circuit 5 (10) according to the fourth embodiment of the present invention is completely identical in structure to the driving circuit 400, except that the second gate electrode G2 of the switching film transistor period is connected to the first gate line Gn. And the first gate electrode G1 of the pixel thin film transistor 2011 is connected to the second gate line Gn. That is, in the structural relationship, the driving circuit 5 (10) is identical to the driving circuit except that the driving order of the first and second gate lines is just opposite. Similarly, although the driving circuit 5 (10) is not different in structure from the driving circuit, the driving signal operation state of the driving circuit 5 (10) may be caused by the difference in the driving order due to the difference in the driving order. It is only similar to the case of the foregoing specific embodiment and the second embodiment, although the order of providing the driving signals of the halogen film transistor _ and the switching film transistor 2021 is not 1 main but the 昼The voltage difference between the voltage and the common voltage can still be stabilized without being affected by the floating voltage value. Therefore, the problem caused by the coupling effect of the parasitic resistance value or the parasitic capacitance value of the drive circuit of the conventional input display can be overcome. The present invention has been disclosed in the above-described several preferred embodiments. As described above, the present invention can be modified and modified in a manner that does not depart from the spirit and scope of the present invention. Scope of the money society towel please special _ _ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( 17 1377547件4: In the type of display: a type of current-type photosensitive element - under ==== electric crystal mixed in - bright state and - dark state of the first input display of the third diagram (Α) shows the conventional The equivalent circuit diagram of the dynamic circuit in the technology.

The figure (8) is a driving signal of the driving circuit of the third figure (Α). The fourth figure (Α) shows the fourth circuit diagram (B) of the equivalent circuit of the driving circuit of the first input type display according to the present invention. Indicates the operating condition according to the number one. A drive signal of a drive circuit of the fourth embodiment (A) is shown in Fig. 5. (A) is an equivalent circuit diagram showing a drive circuit of an output display according to a second embodiment of the present invention.

The fifth diagram (B) shows the operation of the drive circuit according to the fifth diagram (A). Figure 6 is a diagram showing an equivalent circuit of a driving circuit of an input type display according to a third embodiment of the present invention. The seventh drawing shows an equivalent circuit diagram of a driving circuit of the input type display according to the fourth embodiment of the present invention. [Main component symbol description] 10, 20 Read the equivalent circuit of the halogen. Figure 12 Switching film transistor 11 Photosensitive film transistor 1377547 13 Reading line C Capacitor 100, 200, 300, 400, 500 101, 201 Pixel component 1011 , 2011 pixel thin film transistor 1022, 2022 photosensitive film transistor Dm, Dm-ι data line

Cp-1, Cp shared line

Cst storage capacitor

Gi, G2, G3 gate electrode Di, D2, D3 drain electrode SW input

Vbias bias drive circuit equivalent circuit diagram 102, 202 photosensitive element 1021, 2021 switch film transistor

Gn, Gn-l gate line 103, 203 read line

Clc liquid crystal capacitor

Vp.xe. halogen voltage

Si, s2, s3 source electrode

Claims (1)

^77547 Patent Application Fan Park··J曰Revised Replacement Page June 29, 2009 1. A driver circuit for an input display, comprising: a first data line and a second data line, which are parallel to each other Arranging an inter-line and a second_, which are arranged parallel to each other and intersect with the first data line and the second data line to thereby form a pixel of the input display; the first switch το a member having a first electrode coupled to the first common line and disposed between the first gate and the second gate; a gate-first switch member having a second closed electrode S coupled thereto a first----the first closed line and the second switch 70 are connected to the common line and the second switch 70 are operated in a biased state, wherein the first closed line and the second switch 70 are connected to the common line The second gate line is sequentially operated so that the -switching element and the second switching element are sequentially driven by the first gate line and the first gate line, ΆΒ - Μ ^ ' 0g 00 々 勒 勒The opening of the first switch element is asynchronous with the opening of the switching element, so that the electric device floats The shaft circuit l::rt of the first pole electrode is connected to the first data line Μ利|&amp; the driving circuit according to item 2, which stores a capacitor, and the 筮一冯代帝, 3 Stored in this shared line. Miscellaneous (4) Over-existing capacitors are consumed 3. "2. - 2 Please include a liquid in the second item of the patent range and the first-source electrode is used to reduce the common electrode through the liquid crystal capacitor. 5': Patent application scope w The driving circuit of the item: the line is disposed beside the second data line, and is connected to the second switch; ::::: the driving circuit of item 4, wherein the second switch element further comprises a a second drain electrode, a second source electrode, a % pole, and a driving circuit connected to the first line of the second line: the third opening, 7^ &lt;^ containing the third gate a pole electrode, a third drain electrode, and a 2 source electrode, wherein the third gate electrode and the third electrode are shared, and the third source electrode is connected to the second The driving circuit 'the third opening further includes a third interpole electrode, a third dipole electrode and a chirp, wherein the third gate electrode and the third source electrode are each The electrode is not connected, and the third electrode is connected to the common line. The drive circuit of an input display comprises: a column, a data line and a second data line, which are parallel to each other, a first-gate line and a second second line, which are arranged parallel to each other. And intersecting the first data line and the second number line; 21 a switching transistor, number * pq θ Ω 1 Ray, fish (four) - off the transistor has a second gate electrode connected to the second gate line; and the gate of the gate sensor: the body 'connected to the common line And the switch is electrically crystallized &quot;a, and operates in a forward biased state, nil'·(4) and the second gate line are sequentially operated to cause the prime transistor and the switch transistor to borrow the first line The first leg is sequentially driven, and the opening of the halogen transistor and the opening of the switch 10 are asynchronous 'to float the voltage to avoid. The driving circuit of claim 9, wherein the halogen circuit and the δ hai photosensitive circuit are both connected to the common line. The driving circuit of claim 10, wherein the halogen crystal further comprises a first electrode connected to the first data line. 2. The drive circuit of claim 11, further comprising a storage capacitor, and the first source electrode is coupled to the common line through the storage capacitor. 13. The driving circuit of claim 5, further comprising a liquid crystal capacitor ' and the first source electrode is connected to a common electrode through the liquid crystal capacitor. 14. The driving circuit of claim 1, further comprising a read line disposed beside the second data line and connected to the switch transistor 22 2〇12月29曰 15. 16· = The driving transistor described in claim 14 further includes a second electrodeless electrode in which the source is connected to the reading line. _ - a hybrid electrode, wherein the driving circuit of the item 15 of the dry circumference, wherein the photosensitive: the body further comprises a third gate electrode, a third gate electrode, and a third source electrode The third gate electrode and the third electrode are connected to the common line, and the third source electrode is connected to the second electrode 〇 17. The driving circuit of claim 15 wherein the The third switching element further includes a third gate electrode and a third drain electrode to: - a third source electrode, wherein the third gate electrode and the third source electrode are connected to the #苐苐二汲An electrode, and the third electrode is connected to the common line. twenty three