TW200905643A - Driving apparatus and driving method for liquid crystal display with reduced leakage current - Google Patents

Abstract

A driving apparatus and driving method for liquid crystal display with reduced leakage current are provided. The present invention driving method comprises the following steps: first, providing a high level gate voltage to turn on the thin-film-transistor (TFT). During the first period, applying a first low level gate voltage (VGL1) to turn off the TFT of ith row, and during the second period, applying a second low level gate voltage (VGL2) to turn off the TFT of ith row, where i is positive integer. Besides, the first low level gate voltage is different from the second low level gate voltage, and the above two low level gate voltages are determined by the characteristic of TFT.

Description

200905643 94756 19470twf.doc/n IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a method for eliminating display, and _ is directed to an operating device, a driving device, and a driving method. Μ _ panel drive device [Prior Art] Γ Needle ^ rapid progress in the multimedia society, mostly or the dramatic advancement of display devices. As shown in (9), piece space = good efficiency, low power consumption, no radiation and other superior characteristics [Thin-film LCD display (Thin fllm (4) enemy display (10) can display, referred to as TFT-LCD) has gradually become the mainstream of the market. Figure 1 depicts an equivalent circuit diagram of a single-channel of a conventional thin film transistor liquid crystal display. Referring to Figure 2, the equivalent circuit of the single-single circuit 1GG of the conventional tft_lcd includes a thin film transistor nG, a liquid crystal capacitor CLC, a storage capacitor Cst, a common electrode CE, and a parasitic capacitance. In general, in the drive architecture of the current TFT_LCD, the AC mode e〇mmQn VGltage drive architecture (for example, line reversal display technology) is usually applied to existing general-mode small-sized TFTs. The LCD (that is, the AC common voltage is applied to the common electrode CE), and the DC mode common voltage driving architecture (for example, dot inversion display technology) is applied to the existing generally larger TFT-LCD (ie, A DC common voltage is applied to the common electrode CE). FIG. 2A is a diagram showing a coupling effect waveform in a shared voltage driving architecture in an alternating current mode in the pixel circuit 100 of FIG. 1. Figure Green 200905643 94756 iy470twf.doc/n is shown as a broom voltage vG waveform in the pixel circuit (10) of Figure 1. FIG. 2C is a diagram showing the data history % waveform of the conventional pixel circuit 1 in FIG. ® 2D is not an image data voltage vs. waveform that is conventionally used in the pixel circuit (10) of Figure i. FIG. 2E is a diagram showing the AC common voltage vC0M waveform in the conventional pixel circuit 1〇〇. Referring to FIG. 1 and FIG. 2A to FIG. 2E together, it is conventionally known that the equivalent voltage of the pixel circuit 1〇〇 is applied to the common electrode CE of the pixel circuit 100 of the TFT_La).

Ο The capacitor will cause a coupling effect, so that the thin film transistor 11〇 will have a large variation range of the gate-source voltage (Vg§) of the thin film transistor 11 when the adjacent screen is turned off. The most variable amount is AVmin. FIG. 3 is a schematic diagram showing the curve of the thin film transistor m and the pole current v gate source voltage VGS of the conventional halogen circuit 1〇〇 in the AC mode shared voltage driving architecture. Please refer to FIG. 2A and FIG. 3 together, wherein the broken line shown in FIG. 3 is the leakage current limit Lc of the thin film transistor 110. Theoretically, the thin film transistor 110 of the pixel-containing circuit 100 must be turned off in adjacent pupil planes, for example, the picture N+1, and the drain current (1D) of the transistor ιω should be gradually changed. Small to close the thin film transistor n〇. However, it can be seen from the graph of the extreme voltage VGS curve of the thin film transistor 11 揭 disclosed in FIG. 3 that when the thin film electrocrystal is smaller than the characteristic of the thin film transistor diode 丨Γ transistor 110 transistor current _ and is large _ When the leakage current limit of the transistor UG is above, 200905643 y4/5t> iy4/uTwf.doc/n, so that the thin film transistor n〇 of the halogen circuit 1 which is originally turned off cannot be effectively turned off, resulting in 昼The thin film transistor 11 of the prime circuit has a leakage current generated in the region A, so that light leakage occurs on the surface of the TFT_LCD display. [Summary of the Invention]

In view of the above, an object of the present invention is to provide a driving device and a driving method for a display panel, which use the driving power generator in the driving device provided by the present invention to draw according to the i-th column (i is a positive integer) in the display panel. When the thin film transistor of the circuit needs to be turned off, the first low level gate voltage or the second low level gate voltage is output to limit the thin film transistor drain current of the i-th column pixel circuit in the display panel to The area below the leakage current limit is 0. The other purpose of the present invention is to provide a display capable of eliminating leakage current = day according to the infinite current of the thin film transistor of the i-th column of the halogen circuit - the source-source line疋 The first low-level gate voltage and the second low-level pole voltage are effectively turned off to effectively close the first column (丨 is a positive integer) of the display panel to draw a thin film transistor. Wherein the 'first-low level quasi-gate voltage substantially lowers the bit voltage, and the first- and second-low-level inter-electrode voltage curves and the path current of the thin-film transistor-gate source 亍In the embodiment, when the display panel shows that the driving 'turning crystal needs to be turned on, the driving power generator will actuate the power supply to (4) the quasi-gate voltage, and display the second 200905643 94756 19470twf.doc/n in the display panel. During the period when the thin film transistor of the i-th column of the display panel needs to be turned off, 'the driving power source generates H, which causes the driving power source to be the first low-level gate voltage, and the N+1th surface is displayed on the display panel. During the display period (4), the thin _ crystal of the i-th column of the i-th column needs to be turned off, the driving power source generates ϋ, which causes the crane surface to be the second material voltage. Wherein, the first-low scale gate is different from the second low gate voltage, and the first and second low-level gate voltages are based on the gate current of the thin film transistor of the ith column of the i-th column-gate source Determined by the voltage curve. π in the above-described driving device and method of the present invention and the display of the elimination of leakage current - in the embodiment - when the common power of the i-th column of the pixel circuit is the alternating current common voltage, the first and second low-level gate voltages Calculated by the following two formulas: ~ ten; and 匕 - △ △ ~ also - Δ ^ - ( Λ Λ -, where VGL (N; | and Vgl ^ + d are the first low-level gate voltage and The two low-level gate voltages, Δν_ and Λν_ are the gate-source voltage and the VDH is a high-level data voltage when the thin-film transistor of the i-th column of the pixel circuit is turned off during the Nth and the second correction periods. Vdl is a low level data voltage, vcomH is a high level AC common voltage, \. is a low hill voltage, and AVgs is a feed voltage. Gossip is in the above-described driving device and method of the present invention and a display capable of eliminating leakage current In the example, when the common voltage of the i-th column of the pixel circuit is the DC common voltage, the 'first and second low-level gate voltages are calculated by the following two formulas: 200905643 94756 19470twf.doc/n

Vgl(n) ~ △ — ; and V 〇L{N+x\ = mm+\y dl-^ as\ , where 'Vgl(n;) and Vglw+u are the first low-level gate voltage and the second The low-level quasi-gate voltage, AYmax and AVmin are the i-th column halogen circuit - the gate-source voltage and the vDH are high-level data voltage when the thin film transistor is turned off during the Nth and N+1th kneading periods Vdl is the low-level quasi-capacity voltage, and AVGS is the feed-in voltage. f The driving device and the driving method of the display panel provided by the present invention are output according to the i-th column when the thin film electric device according to the i-th column (i is a positive integer) of the display panel needs to be turned off. The thin film current of the prime circuit = the gate current voltage curve determines the first low level gate voltage or the second low level gate voltage to display the thin film of the i-th column of the display panel The crystal and the pole current operate in the region below the leakage current limit, and effectively close the thin film transistor of the i-th column of the display panel, and the second positive and negative (4) can eliminate the leakage. The display of the current using the driving device of the present invention can not only effectively turn off the thin film transistor of the display of the first column of the pixel circuit, but also solve the leakage current problem of the display. The above and other objects, features and advantages of the present invention will become more apparent <RTIgt; [Embodiment] The field ♦t invention is to solve the problem of the equivalent capacitance of the pixel circuit in the display panel under the common-voltage driving structure of the conventional AC mode and the DC mode. 200905643 /JO 1 outside / vnwidoc/η The coupling effect, the thin film transistor of the circuit cannot be driven by the driving of the halogen panel in the display panel, so the present invention provides a display to solve the above problem. The method and the display capable of eliminating the leakage current are shown in FIG. 4, . , s in accordance with the present invention, and the structure of the pixel in the display panel is in the form of a pixel current Id_ between the source and the core. 2A and Figure 4, push the waterfall and smash it. Please refer to the figure (4) at the same time to limit the variation range of the source between the thin-film electrodes of the pixel in the display panel, and the critical value of the dry-circle is _, which can be: AV max

V

Cl(N)

Avmin=v ' 'lv~^Zr'Vc〇mA Formula 1 =_+1) Equation 2, , and 'VDH are pure data voltage, voltage, \. _ is the high level quasi-exchange hill 4 AC common voltage, Vgl (^ v ^ V_L is the low level N+1 (N is a positive integer) book t period in ί N, and membrane Lei Ri (four) door gentleman recognition; 1 display The thinness of the pixel circuit in the board = body off_different - the low level of the gate voltage, and the first - low scale gate voltage residual in the second low level 2 H - is the above formula i and formula 2 In the avgs, ^ thinks that the thin film transistor of the panel is not in the equivalent of the liquid crystal capacitor (. The equivalent parasitic capacitance of the road 200905643 94756 iy47Utwf.d〇c/n (CgS) exists in the simple change of the electric capacitance on the liquid crystal capacitor (also known as the _he effect; ^Beca 2 pressure = capacitor The held voltage deviates from the originally set value, and this change is called feed-through v〇ltage, which can be expressed as · AV〇s -afg gs

Cgs + Cst + CL where 'AVg is the amplitude of the fine voltage Vg, which includes the high voltage vGH and the low level gate voltage Vgl. +gate electric

After the above formula 1 and formula 2 are converted, the following two formulas can be paid, which can be expressed as: JV〇^N\ = ^Vm^-\YDH- W〇s + {VcomH~VcomL. GL(n +1) Since ΔVmax and Δν^η are determined according to the drain current-gate source voltage curve of the body of the i-th column of the pixel circuit, the difference between the 电Vmax and the Δ^^^ can be determined according to The low-level gate voltage used between the display axes (for example, screen 3 N+1) is so intentional, except that the thin film transistor of the pixel circuit in the display panel is in the region 丨: second limit, Effectively reduce the phenomenon of leakage current to provide the best display. If the system is in the DC mode under the common electrical architecture according to the preferred embodiment of the present invention, please refer to FIG. 8A and FIG. △ Vmax and △ Vmin can also be expressed as: AV^=\VDH-W〇^\VCLiN\ Equation 5 AV^-\v〇L{N4~\vDL-^vGS\ Equation 6

Among them, the description of each symbol is the same as above, and after conversion, two formulas can be obtained, which can be expressed as: #在IJ 11 200905643 /^o /uiwf.doc/n VGL{Nt^Vmax~\YDIi~AyGs\ 7

Vgl{n+\) ~ AVmm+\VDL~^VGs\ Equation 8 In this way, according to Equation 7 and Equation 8, the low level of the different face display periods (for example, face N and face N+1) is determined. Extreme voltage. 5 is a block diagram of a display capable of eliminating leakage current in accordance with a preferred embodiment of the present invention. Referring to </ br>, the display 5 〇M system is designed by applying the above formula, where the display panel 501, the driving device 503, and the source driver 5 〇f are included in the display 500 (for example, a liquid crystal display). The display panel 501 has a plurality of pixel circuits (not shown) arranged in an array, wherein i and j are positive integers, and an equivalent circuit diagram of each of the pixel circuits in the display panel 5〇1 is disclosed in FIG. The pixel circuit 1 is similar and will not be described again here. The driving device 503 is coupled to the display panel 501 for outputting the scanning voltage VG to the display panel 501 to determine whether the thin film transistor of the first pixel circuit in the display panel 5〇1 is turned on. The source driver 5〇5 is also coupled to the display panel 501, and outputs the data voltage vD to the opened display panel 5〇1 through the plurality of source wirings according to the received image data; Thin film transistor of a circuit. 1 is a block diagram of a drive unit 5〇3 in accordance with a preferred embodiment of the present invention. Referring to FIG. 5 and FIG. 6 together, the driving device 503 disclosed in FIG. 6 includes a driving power generator 6〇1 and a gate driver 6〇3. Therefore, the driving power generator 601 outputs a corresponding driving power 200905643 94756 19470twf.doc/n DP according to whether the thin film transistor of the first pixel circuit in the display panel 5〇1 is turned on. The gate driver 603 receives the rib--the basic timing T_, and according to the basic timing TeGn(10), the scale 1 is matched with the green-field voltage tm5Gi, and the scan voltage % is called according to the driving power supply dp'. A thin film transistor of the ith column of the 501th pixel circuit.

In the implementation of the present invention, in the N_th positive integer) cycle, when the thin film transistor of the i-th column of the pixel in the panel 501 is required to be turned off after receiving the image resource, the gate driver (10) outputs Scanning voltage vVG is the first-low level gate voltage VGu, to turn off the thin film transistor of the display circuit of the display panel 01, and according to the display panel 5〇1, the common DC current mode is selected. Equation 3 or Equation 7 determines the correct first low-level gate voltage VGLi; and in the first display period, when the thin film transistor of the i-th column of the display panel 501 receives the image word Vs, it needs to be etched. Then, the scan voltage Vg outputted by the gate driver 6〇3 is the second low level gate voltage fox 2 to turn off the thin film transistor of the ith column of the display panel 501, and is used according to the display panel 501. The voltage is in DC or AC mode, and Equation 4 or Equation 8 is selected to determine the correct (four) two low-level gate voltage VGL2. It can be seen from the above that in this way, two different low-level gate voltages can be determined at the same time, and the common voltage driving structure of the shared voltage driving structure and the money mode can be simultaneously combined, and various display technologies can be used, for example, line anti- Turn in display technology (line inversiGn) and dot inversion display technology (your m-) 'and regardless of the mining world - difficult architecture, this embodiment 13

COM 200905643 94756 iy47Utwf.doc/n The low-level gate voltage determination method disclosed can be used to reduce the leakage phenomenon of the thin film transistor of the ith column in the 501. See Figure 7A for the use of the driving device of the present invention 5 〇 3 T in the i-th column of pixels, in the AC mode = combined = should waveform diagram. The picture shows the sweep (four) number G of the second 昼 电路 circuit in the display panel using this method = ^ 503. Fig. 7C shows the data voltage Vd of the pixel circuit of the i-th column in the surface of the driving device 5〇3 of the present invention. Fig. 7Em shows the image data voltage Vs of the driving device 503 of the present invention in the display panel 501. FIG. 7 is a view showing the AC common voltage V of the i-th column pixel circuit in the display panel 501 by using the driving device 503 of the present invention. Referring to FIG. 5, FIG. 6, and FIG. 7A to FIG. 7E, The consumption effect of each of the halogen circuits in the display panel 501 generates a feed frequency = ΔVGS, * and a gate-source voltage (VGS) of each of the pixel circuits in the display panel 501 has a large variation range, and The maximum and minimum critical values ΔVmax and Δνιηίη of the range of variation can be calculated by the above formulas 3 and 4. As can be seen from the waveform diagram disclosed in FIG. 7A, when the thin film transistor of the display panel 5 〇 1 ^ i = 昼 电路 circuit must be turned on and off during the display of the face N (Frame N), the driving power generator 601 causes The output driving power DP is a high level gate voltage (VGH), and the gate driver 6〇3 outputs a scanning voltage VG to turn on the thin film transistor of the first column of the display panel 501, and receives Source driver 505 input 14 200905643 y4 /1/ utwf.doc / n The data voltage vD. In addition, when the display panel 501 β i 昼 昼 I circuit needs to be turned off after receiving the image data Vs during the no-face period, the driving power generator 6 〇 1 according to the display panel 501 β i column of the pixel circuit is turned on. Connected - the level of the voltage Vd (including the high level data voltage ν 〇Η and the low level material voltage VDL) 'and the output drive power dj> is the first

- one of a low level gate voltage (VGL1) and a second low level gate voltage (VGL2) to turn off the thin film transistor of the i-th column of the display panel 501. Wherein, when the level of the received data voltage VD when the i-th column of the display panel 501 is turned on is the high level data voltage VDH (that is, the image data voltage vs. the common voltage of the display panel 5〇1) The driving power generator 6〇1 causes the driving power source DP to be turned on to be the first low level gate voltage (VGL1), that is, calculated by the above-mentioned method 3, and the gate driver 603 outputs a scanning voltage accordingly. ^ = display panel 501 薄膜 the i-th pixel circuit of the thin film transistor is turned off G • Conversely, when the pixel of the i-th column of the display panel 501 is turned on, the level of the received data voltage Vd is a low level data voltage v. That is, the image data voltage Vs is lower than the common voltage of the display panel 5.1. (Also, the power source generator lock causes the output driving power source, the d drive level gate voltage (VGL2), that is, is calculated by the above formula 4. The second low-opening driver 603 is based on the output-scanning voltage v = _ ' and the thin-film transistor of the ith column of the circuit in the continent is shown in FIG. 8A as the driving device 5 〇 3 using the present invention.面才15 200905643 ΐ7τ/wiwf.doc/n 501 in the i-th column In the circuit, the coupling effect waveform diagram in the shared mode of the DC mode is shown in Fig. 8B. Fig. 8B shows the broom VG of the i-th column of the pixel circuit in the display panel 401 by using the driving device 503 of the present invention. It is shown that the data voltage VD of the ith column of the ith column of the driving device 5 〇 3 in the display &amp; 501 is used. Figure 8D green shows the driving device 503 of the present invention in the display panel 401. ; Gong Lu's image data voltage Vs. Figure 8E shows the use of the drive of the present invention

O is set to 503 in the display panel 501 in the i-th column of the halogen circuit of the common circuit ^

Vcom. In the present embodiment, the maximum and minimum threshold values Δν_ and ΔVmin of the gate-source voltage (vGS) of each of the display panels 501 are calculated by the above formulas 7 and 8. The shared voltage drive architecture of the DC mode is equally applicable to the spirit of the present invention. Figure 9 is a perspective view of an erasable display in accordance with another embodiment of the present invention. Please merge the reference 5 and Figure 9. The biggest difference between the camera and the display is the drive. The figure shows a block diagram of the drive smoke of =9. Please refer to FIG. 6, and the _| set %1 includes the driving power generation benefit 601, the polarity driver 603, and the common voltage source _. In the middle, the common voltage source is used to provide the alternating current (9) voltage (Ae__ = age) to the display panel 5G1 _ per-halogen, and according to the above embodiment, the driving power generator is not described here. The relationship of 603 is reduced, and its merits, so in the present embodiment, the disclosed drive placement can be applied to the display of the shared voltage drive architecture of the AC mode. 200905643 i^H/wiwf.doc/n In another embodiment of the present invention, the common voltage source 1001 can also provide a direct "DC common voltage" to each element in the display panel 501. When the common voltage source 101 is used to provide a DC common voltage, the driving device 901 can be applied to the display of the shared voltage driving architecture of the DC mode. In order to achieve the functions of the driving device 503 of the display panel 5〇1 described above. The following are three driving methods of the display panel, which include a display panel driving method of an AC/DC common voltage driving architecture, a display panel driving method of an AC common voltage driving architecture, and a display panel driving method of a DC common voltage driving architecture. The driving device 5〇3 outputs a first low-level gate voltage (VGL1) or a second low-level gate voltage (VGL2) when the thin film transistor of the ith column of the display panel 501 is turned off, so that The thin film transistor of the first | column pixel circuit in the display panel operates in the region under the drain current pole (four), and can effectively close the ith column of the display panel 501 Thin film transistor, so there is no problem of leakage current to ensure the display quality of the display 5〇〇, 9〇〇. Figure U is an AC/DC common voltage driving architecture according to a preferred embodiment of the present invention. A flowchart of a driving method of a display panel, wherein the display panel has a plurality of arrays of "way, and j is a positive integer", and each of the halogen circuits t includes a thin film transistor, and the driving method includes the following steps. First, in step 811〇1, a scan circuit is generated to determine whether the thin film transistor of the i-th column pixel circuit is turned on. Then, as shown in step SU03, 'the Nth picture is displayed on the display panel. When the thin film transistor of the i-th column of the halogen circuit needs to be turned on, the voltage is turned on (2009), and the voltage is displayed on the display panel, and the nth::4=the pixel circuit is displayed on the display panel. The thin film transistor needs to be turned off, and the voltage is turned into a low-level threshold voltage (VGL1). As shown in step si 105, the n+i ί, the thin film transistor of the factory 1 column of the halogen circuit is displayed on the display panel. Need to be turned off = then make pure voltage In the second low-level gate voltage (VGL2) 4, the level gate voltage is different from the second low-level gate voltage, and the first body voltage is based on the thin film power of the pixel of the first column. The recording current Id_ gate source voltage Vgs curve = also the display panel driving method can be applied to the interchangeable "voltage-driven architecture display. , according to another embodiment of the present invention, the alternating current common plate surface (four) transfer method flow chart 'where the display surface "reads a pixel circuit to include a thin film transistor in the positive integer circuit, and this Ο In S12G1, an AC shared power, a mother-single circuit is provided. Then, in step S1203, the film transistor of the first-order pixel circuit is turned on. Display the first solid-state surface scan i-explosive circuit = when the transistor needs to be turned on, then: during the picture period, when the thin-layer pixel circuit is thin, the scan voltage is made the first-low level gate Voltage (10) In addition, in step 7 of the order, during the display panel display _ 昼 2009 18 200905643 94756 19470 twf.d 〇 c / n face period 'When the i-th column of the halogen circuit is thin, the scanning surface = voltage is different from the second The low level quasi-idle voltage is determined by the first-th gate source electric curve. The driving method of ^=== can be used to drive the strip structure in the AC mode. A flow chart showing the driving method of the DC sharing two non-panel of the remuneration, wherein The display method is a positive integer. The array mode includes a thin film transistor. The driving method is as follows: First, in step S1301, DC common power is supplied for H, and in step S1303, A scan voltage, such as half-two: 1 column of the thin-film transistor of the halogen circuit is turned on. After that, the snapper 1305 said that during the display of the Nth surface of the display panel, when the thin film transistor of the 2 circuit needs to be turned on When the scanning voltage, voltage (VGH) is displayed, and the thin film power (4) of the first solid-state pixel circuit is required to be turned off by τ on the display panel, the (four) voltage is the first-low level gate voltage (VGu). And in the step S1307, when the thin film transistor of the N+1th pixel array of the display panel is required to be turned off, the known voltage is the second low level gate. Extreme voltage (VGU). The first low-order gate is different from the second low level voltage, and the first and the first low-level gates are based on the thin film transistor of the i-th column. Yn /j〇/uiwf.doc/n bungee current and voltage VGS turn this display For the panel, the method can be applied to the display of the movable structure in the embodiment. The shared voltage of the star mode is driven in the above steps S1103, S1205, and the board displays the Nth surface assist υ〇 5 in the display surface needs to be closed, And the first; the 薄膜 曰蚩 曰蚩 田 田 J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J Step 嶋^71 listed 昼/circuit of the thin film transistor, and in the (fourth) written 蚧120 2 and S1307 'display on the display panel is turned off, and one time' makes the read Yao voltage lower than the common voltage voltage as one The low-level quasi-gate voltage is the thin-film transistor of the p 昼 昼 电路 circuit. U Ming closed brother α In the embodiment of the driving method of the upper plate, according to the above 3, 4, 7, 8 to Shiben 々々 1 , o Dong flute . 5 ten different brother 1 , brother 2 low position threshold voltage When the thin film transistor of the first column circuit needs to be turned off, the gate current is limited to the region below the leakage current limit of the thin film transistor. η, ' As indicated above, the present invention provides a driving device and a driving method for a display panel. According to the spirit of the driving device and the driving method of the present invention, in the display capable of eliminating leakage current of the present invention, there are the following advantages: 1. Regardless of the display used in the common voltage driving architecture of the AC and DC modes, When the thin film transistor of the i-th column pixel circuit in the display panel is turned off, the operation of the thin film transistor of the i-th column of the display panel is 20

O

Waveform 200905643 ymjO j^*+/uLwf.doc/n The oil line is limited by 4 to the area below the leakage current limit. 2. Regardless of the display of the common-quote and voltage-driven architecture of the AC and DC modes, the leakage current of the display can be eliminated. While the invention has been described above by way of a preferred embodiment, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram showing an equivalent circuit of a conventional thin film transistor liquid crystal display. Once the I chart is shown as a familiar figure! In the pixel circuit, the common mode voltage is used to drive the rectification effect of the rectification effect. Shape. The figure is shown as a broom signal waveform in the conventional circuit of Figure 1. Figure 2Dl is not a known data voltage wave in the pixel circuit of Figure 1. Figure 2Dl will show the image data voltage waveform in the pixel circuit of Figure 1. Figure 2E% is shown as f knowing Figure 1 The AC common voltage in the prime circuit is shown in Fig. 3. The schematic diagram of the (4) current and gate source electric power line of the thin film transistor is shown in Fig. 3 as a preferred embodiment according to the present invention. Embodiments in the AC mode sharing 200905643 jo i^/uLwf.doc/n voltage driving architecture, 1 deer + product 4r_ light current __, the display of the circuit of the galvanic circuit in accordance with a preferred embodiment of the present invention Can Eliminate Leakage Current FIG. 6 is a block diagram of a driving device in accordance with a preferred embodiment of the present invention.

FIG. 7 is a waveform diagram of the coupling voltage in the AC mode of the shared voltage driving structure in the i-th pixel circuit in the display panel by using the driving device of the present invention. FIG. 7B is a view showing a scanning signal of the i-th pixel circuit in the display panel by using the driving device of the present invention. 7C is a diagram showing the data voltage of the first column of the pixel circuit in the display panel using the driving device of the present invention. FIG. 7D is a diagram showing the image data voltage of the ith column of the pixel circuit in the display panel using the driving device of the present invention. 10. Figure 7E illustrates the AC common voltage of the first column of the pixel circuit in the display panel using the driving device of the present invention. Fig. 8 is a view showing a coupling effect waveform diagram of a common voltage driving structure in a DC mode in the i-th pixel circuit of the display panel by the driving device of the present invention. Figure: It shows the sweeping cat signal of the first column of the halogen circuit in the display panel using the driving device of the present invention. The figure continuation is the data voltage of the first column of the halogen circuit in the display panel using the driving device of the present invention. 22 200905643 IDO /ULWf.d〇C/n FIG. 8D illustrates the image data voltage of the ith column of the pixel circuit in the display panel using the driving device of the present invention. FIG. 8E illustrates the DC common voltage of the ith column of the pixel circuit in the display panel using the driving device of the present invention. Figure 9 is a block diagram of a display capable of eliminating leakage current in accordance with another embodiment of the present invention. FIG. 10 is a block diagram of the driving device of FIG. 9. FIG. 11 is a flow chart showing a driving method of a display panel of an AC/DC shared voltage driving architecture according to a preferred embodiment of the present invention. FIG. 12 is a flow chart showing a driving method of a display panel of an AC shared voltage driving architecture according to another embodiment of the present invention. FIG. 13 is a flow chart showing a driving method of a display panel of a DC shared voltage driving architecture according to another embodiment of the present invention. [Description of main components] 100: Alizarin 110: Thin film transistor Clc. Liquid crystal capacitor Cst: Storage capacitor Cgs: Parasitic capacitance CE: Common electrode 500, 900: Display that can eliminate leakage current 501: Display panel 503, 901: Drive Device 505: source driver 23 200905643 y4/D〇iy^/uiwf.doc/η 601: drive power generator 603: gate driver 1001: common mode voltage source S1101 to S1105: in accordance with a preferred embodiment of the present invention The flow chart of the driving method of the display panel of the AC/DC common voltage driving structure is shown in the steps S1201 to S1207: the driving method of the driving panel of the AC common voltage driving architecture according to the preferred embodiment of the present invention The steps S1301 to S1307 are shown in the flowchart of the driving method of the display panel of the DC common voltage driving structure according to a preferred embodiment of the present invention.

Claims (1)

200905643 y4/^o iy4/urwf.doc/n X. Patent application scope: ^-The driving method of the display panel, wherein the denier circuits are arranged in an array, and each of the panels has a multi-film transistor And the driving is too, ^ ^ - the number of stencil circuits is _ - , and each of which includes a thin film transistor, and the driving method includes providing a ac common voltage to the pixel circuits; - scanning voltage for determining whether the i-th column of the transistor is turned on, wherein i is a positive integer; ~ ', the thin film of the film 〇 during the display panel to display the first solid surface, the thin film transistor needs When turned on, 'make ^ the first column of the pixel potential quasi-gate voltage, where N is a positive integer; 'μ know the voltage is a high on the display panel to display the third film period of the film The crystal needs to be turned off 'J Di 昼 昼 电 电 一 一 一 一 ; ; ; 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第 第^= listed second low level quasi-gate voltage, knowing that the voltage is low The bit K extreme voltage is substantially different from the second i-th column. The second low-order quasi-gate voltage is determined according to the line. , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , When the thin film transistor needs to be turned off, its drain current is below the leakage current limit of the film transistor. 25 200905643 94756 iy4/utwf.doc/n V, and: △ is called n+Uw V^M^v^AvDL-^VGS-{VcomH~VcJ ^ f Q where Vglw and Vglw+d are each the first low level The gate voltage of the gate voltage plate and the low-level gate voltage of the gate voltage and the Δν_ each of the thin film transistors of the ith column are at the Nth and N+1th surface periods, the voltage is low, and the VDH is high. Press ~ for = Bessie voltage, vcomH for high level AC common voltage, ^ level AC common voltage, for feed voltage. The driving method comprises the following steps: The circuit pack provides a DC current sharing voltage to the pixel circuits; generating a scan voltage for determining whether the ith column 昼 transistor is turned on, where i is a positive integer; the film displays the Nth 在 in the display panel During the surface, when the germanium transistor needs to be turned on, the voltage is applied to the gate voltage, where N is a positive integer; k is ~ high during the display panel to display the Nth face, the winding When the thin film transistor f is to be turned off, the halogen-electric low-level gate voltage is generated; and the voltage is suppressed--the first column of the N+1th surface of the display panel_昼素26 200905643 ewf.d〇c/n When the transistor needs to be turned off, the second low-level gate voltage, Η田电魇—i!, the first low-level gate voltage is substantially different from the first - low level threshold voltage, and the first, j in the first column The thin film pixel circuits a two - gate low level voltage is determined according to the line system. , electric aa_ 汲 电流 current old secret voltage 5. If the patent scope of the fourth item Ο law, its towel _^ Μ board drive the engraving of the first ―, red low squall gate, and the i-th film When the crystal needs to be turned off, its drain current is below the leakage current limit of the transistor. Method, 1 in the middle of the ^1 = the driving factor of the panel of the age of 4, the Si level quasi-electrode voltage is calculated by the following two formulas ^ GL(n) &quot;^Vm^~\VDH~^VGS GL(N+1 ^AVmin+\VDL-AVGs Ο two low-thickness of the thin film transistor in the Nth and N+1th 昼1 planes; the second gate voltage, v * . The voltage is a two-level data voltage (10), a plurality of display panels of the display panel, wherein the display panel has a multi-patterned film; two arrays are arranged, and each of the pixel circuits includes a film transistor, and the chip The driver I includes: "With a voltage source, the display panel is purely used to provide - a total of 27 200905643 94756 19470twf.doc / n electricity to the mother of the halogen circuit; and a base gate driver, with a majority The gate wiring, Ο ο the timing, and sequentially scanning the gate wiring wheels to receive or turn off the thin electric circuit of the i-th column of the display panel to open the display panel During the Nth surface, the thin film transistor of the 第 第 第 昼 电路 电路 需要 需要 需要 需要 需要 需要 面板 面板 面板 面板 面板 面板 面板 面板 面板 面板 面板 面板 面板Voltage, and during the display of the gate of the gate, when the n-th body of the i-th column of the display panel needs to be turned off, the gate driver outputs a 1-μ bond film In the display panel, the thin film transistor field of the i-th column of the N+1th electric panel is displayed on the display panel, and the π-th pole driver output-second low-level gate Voltage, reading 'and the first-low level gate is substantially different from the positive gate motor, and the ...th: low position ^ ^ circuit rotten (four), the display panel drive The arranging device, the ΐ ΐ 器 系 系 系 系 系 系 系 系 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素 素When the display panel is driven and the thin film transistor of the prime circuit is turned off, the driving power source generates two different reference voltage levels. The display panel described in claim 7 of claim 13 Drive device 28 200905643 94756 19470twf.doc/n, according to which , the second pass /, 隹 - Λ Μ, · - low level of the gate voltage, so that the film transistor needs to be turned off, the domain and the pole U are limited below the leakage current limit of the pin film transistor The zone ===== counts, including: V, Ο L gl{n) ▼ I 戍 1) 1 ; and your I ' VGL (N) and VGL (N +1) are the first - The low-level quasi-gate voltage should be the first = her voltage, ! "Electric = the open-source voltage of the thin-film transistor in the Nth disk, the N+1th gold=dano circuit, Vn„ is the 4th surface of the ancient 璧H i During the period of closure, H ν 〇Η is the quasi-difference voltage, Vm is for the voltage, Vc 〇 mH is the high level AC common voltage, v is low, and the voltage is used to feed the electric calendar. For low level quasi-communication, a total of 10 z• a display panel driving device, 1 middle lanes are arranged in an array, and each =:= '専聪电晶' and the driving device includes: with a thunder, a weaving_* The panel, _ provide - DC to check the 昼 one of the 昼 电路 circuit; and the bundle 护 闻 扬 扬 drive' has a plurality of gate wiring for receiving a base, and sequentially output a scan of the gate wiring a voltage to turn on or off the thin film transistor of the i-th column of the display panel, during the display of the Nth surface, when the display panel 29 200905643 y4 is 6 iy4/utw£doc/xi The thin film transistor of the first column of the halogen circuit requires a C actuator to output a high level gate voltage, and in J. Ning, the gate of the display panel is 'in the i-th column of the display panel' sound: panel display When the Nth individual needs to be turned off, the gate driver wheel "the film electro-crystalline pressure of the Chu road, and the display panel displays the film of the ith column of the ith column in the N+=:=low level inter-electrode panel. The transistor when the display gate driver outputs - the second low level The number of the first low level gate voltage is substantially the positive gate voltage, and the first and second plates 2 are on the thin film transistor of the second low bit matrix circuit汲极电: The pole is determined according to the i. The gate source voltage curve 13. As described in the scope of claim 12, the i-th The thin film transistor of the linolenic circuit causes the f-electrode current to be set in the area of the thin film transistor, and the driving panel of the display panel of the 12th item is obtained, and the voltage is below Column two formulas V: AVmax~\VDH-AVc VG£(^+1j = AV rnin+ \γ 〇L -Ay〇MM vertical = rGL(N) and VGL(N+1) are the first low-level gates Voltage and I ==Feng gate voltage, M^ax and Win are the i-th column "phase transistors are closed during the Nth and N+1th pictures _ gl(n) and 30 200905643 vcv/fd闸 c / n of the gate voltage, VDH is high Huai - owed, (4), Λ '... quasi-material voltage, VDL is low level data i is fed into the electric castle. 15. A liquid crystal display, including. Display panel Most of the paintings and mothers - these halogen circuits include 1_ crystal; connected to the display panel, and according to the - drive power, the wall of the coin ajaA shoulder is not the panel of the i-th column of the pixel circuit The body is turned on, wherein i is a positive integer; and the 1:= drive device is used to consume the display panel, and the source driver has a function for blowing an image data, and according to the image resource wiring, the image is rotated. The data is transferred to the _ transistor of the display surface of the display, and the display panel displays the Nth surface. When the NMOS of the display circuit in the display panel needs to be turned on, the driver is installed. The driving power supply is a high level gate voltage, and when the thin film transistor of the display surface array circuit needs to be turned off, the driving operation causes the power supply to be a 1-low level voltage. In addition, during the display of the N+1th surface of the display panel, when the thin film transistor of the first column of the pixel circuit in the display panel needs to be turned off, the driving power generator causes the driving power source to be one. Second low level gate voltage, where n is a positive integer ' and the first low-level gate voltage is substantially different from the second low-level gate voltage, and the first and second low-level gate voltages are based on the thin film of the i-th column of the pixel circuit The crystal's immersion current-gate source voltage curve is determined. 31 200905643 y4/3〇iy^f/uiwf. doc/π 16. The liquid according to claim 15 of the patent application device includes: only unhelpful, wherein - the gate drive H, with various secret wiring books Timing 'sequentially outputting a scan to receive a base or closing the film of the i-th column of the display panel in the gate wiring to open the liquid crystal as described in claim 15 According to the first and second low-level gate voltages, the thin film transistor of the ii column of the ith column needs to be limited by the in-line current of the thin film transistor. Below the limit of ^ and the pole of electricity 18 · as claimed in claim 15 of the liquid crystal two. When the common voltage of the ith pixel circuit is an ac common: the second low level quiescent voltage is calculated by the following two formulas: get: and 匕J|, GL(N)/, Vgl(n +i;) The film transistor of each of the first low-level quasi-threshold Thunder plate is in the Nth and N+1th writings with = 愍 v v ^ DH as the two-point data 璧, &amp; Low-level data ΐϊ ΐϊ 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 妓 触 触 触 触 触 触 触 触The liquid (4) device described in Item 15 of the 3rd, 9th, and 2nd, and the second and second: the second voltage of the quasi-electricity county-DC voltage is calculated by the following two formulas. 32 200905643 /do /utwf.doc/n Include: K is called &quot;j = A"max —|厂现—; and V〇LiN+l\ = AVmin+\VDL-^V〇s\ J where Vgl(n And VGL(N+1) are the first low-level gate voltage and the second low-level gate voltage, and AVmax and AVmin are the film transistors of the ith column of the pixel circuit at the Nth and N+th The gate voltage at the time of one kneading period is closed, Vdh is the south quasi-vegetation voltage, Vdl is the low quasi-material voltage, and AVcs is the feed voltage.