TW200805245A - Driving circuit and driving method for input display - Google Patents

Abstract

A novel driving circuit for an input display is provided. The driving circuit includes a first and a second data lines disposed in parallel with each other, a first and a second gate lines disposed in parallel with each other and intersected with the first and the second data lines, so as to form a pixel of the input display thereby, a common line disposed between the first and the second gate lines, a first switching element having a first gate electrode connected to the first gate line, a second switching element having a second gate electrode connected to the second gate line, and a third switching element connected between the common line and the second switching element.

Description

200805245 IX. Description of the Invention: [Technical Field] The present invention relates to a display circuit of a display, and more particularly to a circuit for reading a pixel of a display device and a driving method thereof. Preface j [Prior Art] The amorphous material has the sensibility of sensitization, and because of the use of this, the process of the photosensitive element and the known active moment are not used. The process of the Matrix) liquid crystal display is completely compatible. Therefore, the embedding of the k2 non-sa material photosensitive member is cost-competitive as the input display of the conventional touch panel. , will ==::=式:=:, rate== The light transmittance of the display is only one with each of the pixels = the wheel-mounted display in which the photosensitive element is embedded is one = - in general, there are usually two A typical photosensitive element is used in the input type of singular crying; the amorphous yttrium (8), which is respectively represented by the input type display; the second two::: two figures (4) and = unit and - has a -_ photosensitive crystal 12 and - Capacitor C. , ^11^; - switch film electricity ____________ - can be clearly seen in the younger brother (A), 200805245

The switch thin crystal 12 is closed by the input sw. When the switching thin film transistor 12 is switched to the on current, the capacitor c is charged through the read line. When the thin film transistor 12 is subsequently switched to the off state, the charge of the capacitor will be transmitted through the photosensitive film transistor u, and the switch film transistor 12 is switched to the on state again. The current will be read again by the capacitor HG ride charging, the money = C returns to the wire's electrical state. Therefore, by the charge amount of the capacitor C, it is possible to estimate the amount of charge neutralized by the photosensitive film transistor and the amount is proportional to the size of the light received by the photosensitive film transistor. As for the current-type photosensitive element 2〇 shown in FIG. 8(8), the photo-sensitive film transistor 2 is used to generate a photosensitive current, and the magnitude of the current is proportional to the size of the light received by the photosensitive film transistor, The 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 photocurrent value will be read directly from the read line. It should be noted that the photosensitive element transistors 11, 21 are used to generate the photosensitive current regardless of whether it is a charge type or a current type, and the reading of the photosensitive signal is controlled by the switching film transistors 12, 22. However, the current characteristic curves of the photosensitive film transistors 11, 21 in a biased state and a reverse biased state are asymmetrical. Please refer to the second figure, which is a graph showing the characteristics of the photosensitive current of a photosensitive film transistor in 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 as shown by the curve 丨2 in the figure 8052200805245, where the curve h contains Vgs> The voltage state (also referred to as the current on state), and the reverse bias state (also referred to as the current off state) containing ^ < 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, wherein the curve h contains the biased state of Vgs> (also referred to as current on (oncurrent). State), and the reverse biased state (also referred to as the current 关闭 current current state) containing Vgs < In general, for the current-type photosensitive unit, the photosensitive film transistor should be used. The operation is in a forward biased state in order to mitigate the signal delay caused by the parasitic resistance or parasitic capacitance effect of the read line. Although the above-mentioned parasitic resistance and parasitic capacitance effect can be avoided by operating the photosensitive film transistor in a biased state, the input mode shows that the element is still present in 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 figure (A), the driving circuit 1 in each of the read pixels includes a first gate line Gw and a second gate line Gn, and a first data line Dm i and The two data lines Ιλ are arranged to cross the first and second gate lines Gw and Gn to constitute the read pixel of the input display type. In addition, in each read pixel, a read line 103 is disposed between the first and second data lines d^, venge, and traverses the entire read pixel, and a common line Cp i is disposed between the first gate line Gn-1 and the second gate line Gn. On the other hand, the % road layout in each of the read pixels can still be divided into two parts, that is, a unitary unit 1Q1 and a photosensitive unit 1〇2. As can be clearly seen from the third diagram (A), the book is 200805245 = sex connection, _ line c... and 101 - storage capacitor crying '% pressure can be supplied to the pixel element, Cst also passes through the common line ^丨提#_| = The photosensitive unit 102 produces a photodiode (: can also know the book Xin Xidi - Figure (A) 1011, check each - 101 has a halogen thin film transistor electrode: crystal 1011 and the input The display of the display is sin==, and the pixel electrode is shown with the input;: crying, *drawing) a liquid crystal capacitor capacitor constituting the input display. Then, it is composed of another capacitor, that is, a pixel electrode and a common line Ch. Please refer to the third picture (8) for the operation status. As in the third figure (8), 2 = 2 3 n -: when a signal having a - high level is provided, the pixel unit m is switched to the on state once the germanium film transistor 1011 is switched from the first data line H The signal will be input to the element unit ιοί and the production/generation-salvin voltage vPixel 'provided this element to provide the corresponding gray level value. In the case of g H, a switching thin film transistor i 〇 2 i of the photosensitive unit i 〇 2 is also switched to an open state. A photocurrent generated by a photosensitive thin film transistor passes through the switching thin film transistor. 21 is output to the read line 103. However, since the common voltage supplied by the common line Cp] is affected by the parasitic resistance value, the voltage difference between the pixel voltage and the common voltage fluctuates. When the first gate line Gn i provides a low level signal, the pixel thin film transistor 1〇11 and the switching thin film transistor 1021 will be switched to the off state, and thus the photosensitive power is no longer generated. -一—_ —_ ...------- 200805245 Since the & first private muscle is lost, the pressure of the common line Ch will return to a stable voltage value.妒11的,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, t, 旦|兀仵 以上 以上 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于 鉴于The above-mentioned missing of the (four) drive circuit and its square display. Wei (four) input type display [invention] display) drive circuit, which contains _ 1 PUt and a _ _ Zhao 媸 green „ brother a data line (data line)

Hne)^ ; ^-^^(gate) and "a gate line, which are arranged parallel to each other and intersect with the line and the second data line, and the data is checked and boasted. ^^ _ straw constituting _ human display - Between the two closed lines; - the first switching element, having two: = to the first - closed line; a second switching element,: the brother, the electrode connection and the second opening element =; Γ =, connected to the The common line is detached, i: y, the second switching element operates in the - direction to the shape ^ where the first gate line and the first make the first opening element and the 兮篦__ M ' , #琴第第(四)—The switching element is driven sequentially by the first brake line 4 brother. According to the above concept, wherein the first switching element further includes - the first 汲 200805245 electrode connected to the first data line, and the ~ * common line. The first source electrode is connected to the drive according to the above concept, wherein the first source electrode and the first source electrode comprise a storage capacitor line. The μ 电容器 capacitor is connected to the sharing according to the above concept, wherein the driving state is ???, and the first source electrode passes through. It also includes a liquid crystal capacitor electrode. The Λ/曰曰 capacitor is connected to a common one according to the above concept, wherein the driving power is next to the second data line, and the diagnosis further comprises a reading line setting according to the above concept, wherein the second opening type The vegetative. The pole electrode, and the third electrode connected to the reading line, further includes a second electrode. According to the above concept, 1 is the source electrode. The electrode, the first; the dyad:: 5 haidi two switching elements further include - the third brother and the second electrode and one 笙 - the three gate electrode and the third (four) pole 'where: the source electrode is connected Going to the second secret sharing line, and the third opening electrode=on, in which the third switching element further includes a third second bucket, a second drain electrode, and a third source electrode The A41 electrode and the 5th second source electrode are connected to the second electrodeless electrode, and the second drain electrode is connected to the common line. The monthly concept is to propose an input display (input drive circuit comprising a first data line (such as data lines, which are arranged parallel to each other; a first gate line (gate 1 ne and a second gate line) Arranging parallel to each other and intersecting with the first number 200805245 data line and the second data line; a halogen circuit comprising a transistor, the halogen transistor having a first idle electrode connected thereto = brake line, and a photosensitive circuit, and φ, 兮味帝曰#, 兮闻+曰μ " towel~ Sense first stroke also contains a switch electric 曰曰 body 5 hai switch hair crystal has a second pole The electric and the photosensitive transistor are in a biased state with the switching transistor.

The first idle line and the second gate line are sequentially driven by the first gate: the crystal and the switch transistor are sequentially driven by the first gate line. In the section, wherein the driving circuit further comprises - between the common line settings 'where the pixel circuit is electrically connected to the sensing electrode; and the Zhao contains - the first, the common line. According to the line and the younger one, the source electrode is connected to the crying, and the heart is formed. The driving circuit further includes a storage capacitor: The source-source electrode is connected to the sharer through the storage capacitor, and the drive circuit further includes a liquid crystal capacitor electrode. The younger brother-source electrode is connected to a common through the liquid crystal capacitor. The driving circuit further includes a read line setting data line, and the pixel is passed through the input type display. _x The above concept, wherein the switching transistor further comprises a second drain 12 200805245, wherein the source electrode is connected to the read electrode and the second source electrode line. The electrode imagining, wherein the photosensitive transistor further comprises a third third electrode m... a drain electrode and a third source electrode, wherein the first: == the third W pole is connected to the common line, _ = pole An electrode is then connected to the second drain electrode.

The third switching element further comprises a third gate three mΓΪ electrode and a third source electrode, wherein the third source electrode is connected to the second drain electrode, The second electrode of the second pole is connected to the common line. The present invention has a more in-depth understanding of the following description of the following drawings and the detailed description of the embodiments. [Embodiment] Referring to the fourth figure (the illusion, it is the first embodiment according to the present invention. An equivalent circuit diagram of a driving circuit of the input display of J. As shown in the fourth figure (/), the driving circuit 200 includes a gate line Gn-〗 and a second gate in each of the read pixels. a line Gn, and a first data line Dm" and a younger brother, the data line 交叉 is interleaved with the first and second gate lines to construct the read element 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 !), Dm, and a common line Cp-i is disposed at the first gate. Between the line Gw and the second gate line η. On the other hand, the circuit layout in each of the read pixels can be divided into two parts, namely a unitary unit 2〇1 and a photosensitive unit 2〇2. More specifically, the pixel unit 201 further comprises a halogen film transistor 12 200805245 昼 film transistor 2 〇 11 has a first

:M G:" -第-汲 pole electrode D, connected to the first data, "'" and $' pole & pass-storage capacitor L

As described above, the storage capacitor is constituted by a halogen element electrode connected to the /', % pole s, and the common line k. In addition, the first source electrode Sj of the halogen thin film transistor 2011 is connected, the liquid crystal capacitor α, wherein, as described above, the liquid crystal electric benefit Cu is composed of the halogen electrode and the input display A common electrode (not drawn) is formed. In a preferred embodiment, the first source electrode & of the pixel thin film transistor 2011 is also coupled to a common electrode of the input display via the liquid crystal capacitor Cic. On the other hand, the photosensitive unit 202 includes a switching thin film transistor 2021 having a second gate electrode G2 connected to the second gate line Gn, a second gate electrode 匕, and a second The second source electrode & is connected to the read line 203. In addition, the photosensitive unit 202 further includes a photosensitive film transistor 2022 having a third gate electrode G3 and a third drain electrode & commonly connected to the common line cP-i, And a third source electrode is connected to the second electrode. In the driving circuit 2 Q of the above-described embodiment of the present invention, although the pixel unit 201 and the photosensitive unit 202 are directly electrically connected to the common line Cp_i, the pixel unit 2〇1 The halogen film transistor 2011 and the switching film transistor 2021 of the photosensitive unit 202 are not driven by the same gate line. Instead, they are sequentially driven through the first gate line Gn i and the second gate line Gn. Therefore, the opening time of the halogen film transistor 2 〇 1 1 13 200805245 and the switching film transistor 2021 is asynchronous, because the problem of floating of the common voltage derived from the use of the common line is obtained. The above conclusion can be further explained as follows with reference to the fourth diagram (B). Please refer to the fourth diagram (B)' which shows the operation status of the driving signal of the driving circuit according to the fourth diagram (A). As described above, since the pixel film private crystal 2011 and the switch film transistor 2021 are sequentially driven by the first gate line Gh and the second gate line Gn, respectively, when the film 2G11 is When the -th-high number of the first gate line Gn-! is driven, the pixel voltage Vpixel of the input display (as shown in the table;;) = will be generated to provide the gray scale value for the pixel; When the open-film transistor 2021 is driven by a second high level signal of the second gate line 1, since the common voltage value of the common line is higher than the voltage of the read line 2〇3, a light-sensitive current will be The photosensitive current signal is generated and read through the read line. Therefore, when the switch film transistor 2〇21 is turned off, the book transistor 2011 has already turned off the X before the second gate line is turned on. Once so, the voltage difference between the voltage of the pixel and the common voltage is no longer affected by the floating of the shared voltage value. It should be noted that when the halogen film transistor 2〇11 is driven by the πth level signal of the first gate line G, the voltage value of the pixel electrode is gradually approached to (4) the first data. The voltage level provided by line L—controlling the voltage of the L 5 tiger is as shown in the fourth figure (8). However, the voltage difference between the pixel voltage and the common voltage used to provide the “gray scale value” This is determined by the voltage bit of the control data signal and the number of outputs between the commons. 14 200805245 Please refer to FIG. 5(A), which shows an input display according to a second embodiment of the present invention. An equivalent circuit diagram of a driving circuit. Compared with the driving circuit 200 of the first embodiment in the fourth embodiment (A), the driving circuit 300 according to the second embodiment of the present invention is almost completely identical in structure. The driving circuit 200 corresponds to only the second gate electrode G2 of the switching thin film transistor 2021 is connected to the first gate line 0^ and the first gate electrode G! of the halogen thin film transistor 2011 is connected to the The second gate line Gn. That is, in the structural relationship, the 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 operating condition of the driving circuit 300 may be slightly different from that of the driving circuit 200. Referring to FIG. 5(B), it is shown to operate according to the driving signal of the driving circuit according to the fifth diagram (A). As shown in the fifth figure (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 VPlxel voltage is written, Driving the photosensitive cells of the previous column to read the pixels, the photocurrent is provided by the common line of the previous column, so when the pixel voltage is written, the symmetric common line potential does not shift; The voltage difference between the voltage of the voltage and the common voltage can still be maintained without being affected by the floating voltage value. Please follow the sixth picture of the wheat. An equivalent circuit diagram of a driving circuit of an input display of a third embodiment. Compared with the driving circuit 200 of the first embodiment in the fourth embodiment (A), the root 15 200805245 is specifically embodied in accordance with the present invention. The driving circuit 400 in the embodiment has almost the same structure as the driving circuit 200, except that a third gate electrode G3 and a third source electrode Ss of the third salt thin film transistor 2022 are A second drain electrode d is connected to the switching thin film transistor 2021, and a third drain electrode m of the photosensitive thin film transistor 2022 is connected to the common line CpM.

Similar to the structure of the input 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 Cp i is lower than the voltage of the read line 203. The driving circuit 4 is the same as the foregoing driving circuit structure, because the halogen film transistor 2011 and the switching film transistor 2021 are respectively connected by the second wire G n and the second gate wire G n is sequentially driven'. Therefore, when the halogen thin film transistor 2011 is driven by a first high level signal of the first gate line Gh, the pixel voltage Vpixel of the input display will be generated, which is the When the halogen thin film transistor 2GU ends the driving state and the switching thin film transistor 2G21 is driven by the second high level signal of the second gate line Gn' because of the common voltage of the line The value is lower than the voltage of the read line 2〇3. Therefore, the photo-sensing current will be generated and flowed through the read line to the line 88-i. Therefore, when the switch film transistor 2 is turned off, the The halogen film transistor 2 (}11 has already been turned off at the second gate ^2] so that the voltage difference between the voltage of the pixel and the common voltage is no longer fluctuated by the shared voltage value. Impact. Month, magnetic,, 'ί see the seventh picture, its A circuit diagram showing a driver circuit of an input/display device of an input type display according to a fourth embodiment of the present invention. Compared with the driver circuit 400 of the third embodiment in the sixth diagram of FIG. The driving circuit 500 in the fourth embodiment of the present invention completely corresponds to the driving circuit 400 except that the second gate electrode G2 of the switching thin film transistor 2021 is connected to the first gate line and the halogen film is electrically connected. The first gate electrode Gi of the crystal 2011 is connected to the second gate line Gn. That is to say, in a structural relationship, the driving circuit 500 is identical to the driving circuit 400, except that the first and the first The driving sequence of the two gate lines is just the opposite. Similarly, although the driving circuit 500 and the driving circuit 400 are not different in structure, the driving signal operation condition of the driving circuit 500 may be caused by the difference in driving order. The driving signal is generated in a difference in order, but similar to the case of the foregoing first embodiment and the second embodiment, although the halogen film transistor 2011 and the The driving signal for turning on and off the thin film transistor 2021 is provided in a different order, but the voltage difference between the pixel voltage and the common voltage can be maintained stably without being affected by the floating voltage value floating. The problem caused by the coupling effect of the parasitic resistance value or the parasitic capacitance value of the driving circuit of the conventional input display can be overcome. The present invention is disclosed above in the above several preferred embodiments, but it is not intended to limit the present invention. It is to be understood that the scope of the present invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The first figure (A) is an equivalent circuit diagram showing a reading element of a charge type photosensitive element in an input type display. 17 200805245 Current-type sensible elements Bright state and dark state Figure-B (B) shows the equivalent circuit diagram of the pixel of the input display. The second figure shows the characteristic curve of the photosensitive current of the photosensitive film transistor under the condition. A drive-type display of the electro-optical technology (8) records the drive signal of the drive circuit of the third figure (1), and the wire is driven according to the first embodiment of the present invention. An equivalent circuit diagram of a drive circuit that is not in use. = Four® (8) indicates that the drive signal of the drive circuit according to the fourth diagram (Α) is in a state of stay. And a fifth diagram (Α) is an equivalent circuit diagram of a driving circuit of an input type display according to a second embodiment of the present invention. The fifth diagram (8) shows the operation state of the drive signal of the drive circuit according to the fifth diagram (Α). 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. Figure 7 is a diagram showing an equivalent circuit of a driving circuit of an input type display according to a fourth embodiment of the present invention. [Explanation of main component symbols] 10, 20 equivalent circuit diagram of photosensitive element Photosensitive film transistor 12 Switching film transistor u 18 200805245 13 Reading line C capacitor 100, 200, 300, 400, 500 101, 201 pixel components 1011, 2011 pixel thin film transistor 1022, 2022 photosensitive film transistor

Dm, Dm-l data line

Cp-1, Cp shared line

Cst storage capacitor

Gl, G2, G3 gate electrode h, D2, D3 drain electrode sw input

Equivalent circuit diagram of Vbias bias drive circuit 102, 202 photosensitive element 1021, 2021 switching thin film transistor Gn, Gn-1 idle line 103, 203 read line

Cic liquid crystal capacitor

Vpixel halogen voltage

Si, S2, S3 source electrodes

19

Claims (1)

200805245 X. Patent application scope: 1. 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 and a second gate line, Arranging parallel to each other and intersecting the first data line and the second data line to thereby form a pixel of the input display; a common line disposed at the first gate line and the second gate line a first switching element having a first gate electrode connected to the first gate line; a second switching element having a second gate electrode connected to the second gate line; and a third switch An element connected between the common line and the second switching element, wherein the third switching element operates in a forward bias state, wherein the first gate line and the second gate line are sequentially operated to enable The first switching element and the second switching element are sequentially driven by the first gate line and the second gate line. 2. The driving circuit of claim 1, wherein the first switching element further comprises a first drain electrode connected to the first data line. 3. The driving circuit of claim 2, further comprising a storage capacitor, and the first source electrode is coupled to the common line through the storage capacitor. 4. The driving circuit of claim 2, further comprising a liquid crystal capacitor, and the first source electrode is connected to the common electrode through the liquid crystal capacitor I. 5. The driving circuit of claim 1, further comprising a read line disposed beside the second data line and connected to the second switching element. 6. The driving circuit of claim 4, wherein the second switching element further comprises a second drain electrode and a second source electrode connected to the read line. 7. The driving circuit of claim 5, wherein the third switching element further comprises a third gate electrode, a third drain electrode, and a third source electrode, wherein the third gate An electrode and the third drain electrode are connected to the common line, and the third source electrode is connected to the second drain electrode. 8. The driving circuit of claim 5, wherein the third switching element further comprises a third gate electrode, a third; and a pole electrode and a third source electrode, wherein the third gate The pole electrode and the third source electrode are connected to the second drain electrode, and the third drain electrode is connected to the common line. 9. The driving circuit of an input display, comprising: 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, which are arranged parallel to each other and a first data line and the second data line intersecting; a halogen circuit comprising: a halogen crystal having a first gate electrode connected to the first gate; and 21 200805245 The circuit includes: a switching transistor having a second gate electrode connected to the second gate line; and a photosensitive transistor connected to the switching transistor and operating in a biased state, The first gate line and the second gate line are sequentially operated, so that the pixel transistor and the switch transistor are sequentially driven by the first gate line and the second gate line. 10. The driving circuit of claim 9, further comprising a common line disposed between the first gate line and the second gate line, wherein the pixel circuit and the photosensitive circuit are both connected to the Shared line. 11. The driving circuit of claim 10, wherein the pixel transistor further comprises a first drain electrode connected to the first data line. 12. 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 11, further comprising a liquid crystal capacitor, and the first source electrode is coupled to a common electrode through the liquid crystal capacitor. 14. The driving circuit of claim 10, further comprising a read line disposed beside the second data line and connected to the switching transistor. 15. The driving circuit of claim 14, wherein the switching transistor further comprises a second drain electrode and a second source electrode, wherein the source electrode is connected to the read line in 2205205245 . 16. The driving circuit of claim 15, wherein the photosensitive transistor further comprises a third gate electrode, a third drain electrode, and a third source electrode, wherein the third gate electrode The third drain electrode is connected to the common line, and the third source electrode is connected to the second drain electrode. 17. The driving circuit of claim 15, wherein the third switching element further comprises a third gate electrode, a third electrodeless electrode, and a third source electrode, wherein the third gate The pole electrode and the third source electrode are connected to the second drain electrode, and the third drain electrode is connected to the common line. twenty three