TWI271685B - Common voltage modification circuit and the method thereof - Google Patents

Abstract

A common voltage modification circuit and a method thereof are provided. The present invention is characterized in that an output voltage is provided to a storage capacitor in each of the pixels in a thin-film transistor liquid crystal display (TFT LCD) based on a predetermined voltage and a common voltage. Wherein a liquid crystal capacitor of each pixel is electrically connected to the common voltage. In addition, the phase and amplitude of the output voltage are same as the phase and amplitude of the common voltage. Finally, the result of subtracting the output voltage from the common voltage is equal to the absolute value of the predetermined voltage.

Description

Doc/006 127 Fox. IX. Description of the Invention: [Technical Field] The present invention relates to a common voltage correction for a thin-film transistor liquid crystal display (TFT LCD) Circuits and methods, and more particularly to a correction circuit and method for correcting a common voltage of alternating current (AC) modulation. [Prior Art] The pixels of a general thin film liquid crystal display include a thin film transistor, a storage capacitor, and a liquid crystal capacitor. If a metal-insulator semiconductor (MIS) structure is used as the storage capacitor, the number of process masks can be reduced and the manufacturing cost can be reduced. US Pat. The driving voltage of different levels can improve the inaccuracy caused by the innate process factors of the gray scale of the active matrix thin film liquid crystal display (AMTFT LCD). However, its common voltage is a fixed negative voltage. By using the common voltage of the AC, the amplitude of the output voltage of the source ddw integrated circuit can be reduced. ^ The power consumption of the source ddw integrated circuit is the same as the invention of the above-mentioned U.S. Patent No. (10)] (2), which is applied to the common voltage using ac. _ LCD display panel (shirt_1271 gas. · transistor liquid crystal display panel) .. closed gray scale voltage error, resulting in display quality is not f "Pen pen _ body off [invention content] and the purpose of the present invention Is to provide - a kind of lang f pressure correction AC common voltage reduction source drive circuit wheel _ circuit, can make power consumption, and maintain gray scale power Μ correct, into two, reduce the other purpose of the present invention is to provide The quality of the 妓 昼 昼 以 以 以 以 以 以 以 以 以 以 以 以 以 以 以 以 以 以 以 以 请 请 请 s s s s s s s s s s s s s s s s s s s s s s s s Circuit. Common voltage production pressure, provided in the 屮+ factory soil opening road according to the preset voltage 盥J£ the same as the total capacity of the electricity = the voltage in the pressure to =, each of the two pixels per per 昼 ^ The common voltage for the package is the AC voltage. The voltage of the turn-off voltage is also electrically connected to the common electrode, the common voltage minus the output: etc. and the amplitude is the same, and the above common Lemma drinking soil is at the absolute value of the pre-cross voltage. Electricity ί et al. 2:: 2, in the embodiment, 'preset voltage is the above, and the same voltage is applied to the preset voltage. Positive _, heart; = positive circuit 'in the embodiment, preset voltage numerator In the embodiment, each of the books is a metal-insulator semiconductor structure. — 127

Wf. doc/〇〇6 From another point of view, the present invention further proposes a power-off; preset_and-common voltage== electrodes. In the middle, the common pixel of the storage capacitor of the ^^ is the AC voltage and the common voltage. Each of the power outlets is electrically connected to a common voltage with a total of two == poles. The output voltage is subtracted from the turn-off and the second amplitude is synchronized and the amplitude is the same. Finally, the common output voltage is equal to the absolute value of the preset voltage. The solid side of the pressure repair, the hairpin of the original power supply of the two common voltages as the turn-off voltage, turn it out = Xin: AC, and the output voltage of the port is the same as the common voltage. The voltage is used to lower the source drive power; at the same time, AC is used. Ganzi output the amplitude of the electric castle, reduce the power consumption, reduce the number of steps, and correct the voltage. The number of electricity in the storage capacitor is correct to ensure the quality of the surface. In order to save the above, other purposes, features and advantages can be more obvious === she is difficult to edit' and cooperate with the drawing, [embodiment], the following description of the eye i, Figure J is based on the present invention A partial circuit diagram of the thin film liquid crystal display 1 () of the first embodiment. The circuit of the item i includes the gate drive § D, the gate driver integmted circuit GD, the thin film liquid crystal display panel pL, and the arithmetic circuit 1〇1. 7 • 12 7 1 ^i^^〇twf.doc/00i The common voltage correction circuit of this embodiment includes a drive circuit SD.运#电路1〇1 and source Although the thin film liquid crystal display of Figure 1 can actually include any number of all, ,,, and day, not only six elements, the PIX including the thin film transistor Q1, storage? : Factory ^ CLC. Among them, the thin film transistor Q1 ^ S, and the liquid crystal capacitor ^ GD, the Qing (four) electrical storage capacitor Cs have - terminal electrical connection two = dynamic circuit. She stored the electrode with (10) her (10)' another ^: 曰曰脰... that is, 昼素 = OUT 0T. Finally, the liquid crystal capacitor electrode QS, the other - (four) button is connected to the county board =0 η (10) her), electrically connected to the common voltage: for example, the 'mother-one halogen storage capacitor c body structure. The name of Mt. Meng, the border of the township is not good? PIX is an example. When the thin film transistor Q1 is turned off, in order to show only the capacitance value of the storage capacitor CS and the liquid crystal must be maintained. In the case of the same, the cross-voltage of the liquid crystal capacitor Cs and the liquid crystal capacitor CLC are unchanged. In ^ Same as _v_ is AC_. In order to make the storage capacitor i ^ not, the output M VOT of the different circuit (8) must be synchronized with the phase of the house Vcom and the amplitude is the same. Package nfr7 system to achieve the above objectives, this #施 side calculation road 1G1 will receive the preset power lVp and system VeQm, and root _ set voltage, = same power M VC0m 'provide the output voltage ν 〇 τ to the thin film liquid crystal display j (8) 8 1271 啰The storage capacitor Cs of a parent of 0twf.doc/006. The output voltage v 〇 T and the common voltage Vcom are both AC voltages. Each of the pixel liquid crystal capacitors CLC is also electrically connected to the common voltage Vcom. The output voltage V0T is synchronized with the phase of the common voltage Vcom and has the same amplitude, and the common voltage Vc 〇 m minus the output voltage V0T is equal to the absolute value of the preset voltage _Vp. In the present embodiment, the common voltage Vc〇m is provided by the source drive circuit SD. The preset voltage -Vp is a negative voltage, so the output voltage ν 〇 τ is equal to the common voltage Vcom plus the preset voltage _Vp. As for the value of the preset voltage _Vp, it is based on the prior U.S. Patent No. 6,392,623. In other words, the pre-sighing voltage -Vp is equal to -Vpmax_Vdmax, where _Vpmax is the source=circuit SD is transmitted to the lowest voltage of each element, and Vdmax is the depletion region of the storage capacitor Cs of each element ( Depletion layer) The voltage required to maintain the maximum width. The common voltage Vcom is added to the preset voltage _vp, and the arithmetic circuit 101 of the present embodiment is a positive phase adding circuit which is formed by an operational amplifier (operational amplifier). As shown in FIG. 1, the arithmetic circuit ιοί includes a power amplification QP and four resistors R. The operation amplification is 〇P electrically connected to the output terminal 的T of the arithmetic circuit 101 by its output terminal. The first resistor R is electrically connected between the output φ of the operational amplifier μ1 and the inverting input terminal (inverting (4)). f The first end of the two T resistors 11R is electrically connected to the operational amplifier 〇p, and the second terminal is grounded. The third resistor R is electrically connected between the non-inverting input terminal (n〇n_inverting inPut terminal) and the total of 5Vc〇m. Finally, the fourth resistor r is electrically connected between the positive phase of the operational amplifier op of the 9-127163⁄4 0twf.doc/〇〇6 and the predetermined voltage _vp. The details of the operation are not here. The road is extremely common, and further with the second =; the power and electricity, the circuit GD output high and low level, *% of the highest health and health. In this real second Emperor /,, rolling Vcom is swinging in the range of 5V and 〇V, and the input example = 夂ν°»Τ ί common voltage Vc°m plus the preset voltage -Vp (in this embodiment; mL fruit, so it is in the interval of _7v and -i2v. It is seen by ", that the 'rounding voltage is synchronized with the phase of the common voltage V_, and the amplitude is the same. 乂下"Children's second implementation of the present invention For example, please refer to FIG. 3. FIG. 3 is a partial view of a thin film liquid crystal display according to a second embodiment of the present invention. The thin film liquid crystal display 300 includes a source driving circuit SD, = driving a fast circuit GD, The thin film liquid crystal display panel pL, the arithmetic circuit, the 丄, and /, the generating state 302. The common voltage correction of the present embodiment includes the arithmetic circuit 301 and the common voltage generator 3〇2. In this embodiment, the common voltage common voltage is generated by ϋ 302 instead of the secret drive = SD. Furthermore, the preset voltage Vp of the present embodiment is a positive voltage, = slightly V 〇 t is equal to the common voltage Vcom minus the pre- Set the voltage Vp. This embodiment implements the voltage Vp and the preset voltage value of the previous embodiment. The value of $ is reversed. That is to say, the preset voltage % of this embodiment is negative - (-vpmax) + Vdmax, where _Vpmax is the source drive circuit. 1 out of 6 twisted twf.doc/006 6 twisted 〇twf.doc/006 is stored, the lowest voltage of a halogen, and Vdmax is the voltage required to maintain the depletion region of each buffer valley at the maximum width. As shown in Figure 3, in order to subtract the common voltage The voltage p is set. The arithmetic circuit 301 of the present embodiment is a subtraction circuit with an operational amplifier 〇p as a heart, including an operational amplifier op and four resistors r. Connected to the arithmetic circuit 301

of. The first resistor R is electrically connected between the op amp OP phase inputs. The second resistor R is electrically connected to; the inverting input of the crying is between the preset voltage Vp. The third one is electrically connected to the positive phase of the op amp 〇p, which is the positive phase of the OP, and the second terminal is grounded. The above-mentioned conventional knowledge has the same effect: the circuit can achieve the same effect, for example, the same: there is the same; the circuit of the off circuit and the fine invention should be combined with the common electric dust correction circuit described above. Cake correction method. In the embodiment of the voltage correction circuit of the present invention, there is already a charge; according to the example of 1271· Otwf.doc/006, the present invention is to output the common electric motorcycle to the 4 h mother through the preset electric house. To Beijing, the power of the mother and the mother of a liquid crystal capacitor. Since 葙 solid reading, the output voltage and J are pre-compressed, and the phase is synchronized, and the amplitude is also /, and the electric power is monitored. Save the number of process masks for turbulence, reduce the use of MB structure to reduce the output voltage of the low source drive circuit,

Can be dimensioned = electric call and then sacrifice = inside; number; indeed, to ensure the quality of the noodles. Although the present invention has been disclosed in the preferred embodiments as above, the present invention is limited to the use of I 孰 羽 + from an I ..., , , , , , , , , , , , , , , , , , , Do not leave and dry, when you can make some changes to the side, so this; day = the scope of the application is attached to the application of the application _ defined by the protection of the U [simplified description]

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of a circuit according to the first part of the present invention. Fig. 2 is a timing chart of the _th drive signal according to the present invention. Fig. 3 of the liquid crystal display of the embodiment of the thin film liquid crystal display of the embodiment is a schematic view of a part of the circuit according to the present invention. [Summary of main component symbols] of the thin film liquid crystal display of the second embodiment 100, 300 · > Special film liquid crystal display 101, 301 ·· Operation circuit 302: Common ink generator 12 ^ ^^^0twf.doc/006

Clc · Liquid crystal capacitor

Cs: storage capacitor GD: gate drive circuit 0P: operational amplifier 0T: output terminal of arithmetic circuit PIX: pixel LCD of thin film liquid crystal display panel: thin film liquid crystal display panel Q1: thin film transistor • QS: source of thin film transistor R: Resistor SD: source drive circuit Vcom: common voltage VcomH: the highest level of common voltage VcomL: the lowest level of the common voltage VGH: the output high level of the gate drive circuit Vgl: the output of the gate drive circuit is low Level _ VOT: Output voltage of the operation circuit -Vp, Vp: preset voltage 13

Claims (1)

12716^0—Scope of application for patents·· l A common voltage correction circuit, including · a common electric dust generated crying at the output-common voltage; and «circuit' receiving-preset voltage ^^ gate i the preset voltage and The common voltage, the supply-output power, and according to the storage capacitance of each display of the display, the common liquid crystal liquid, the electricity-and the common electricity are all the liquid crystal electric valley of the J-screen On the opposite electrode also =, the mother - the 昼 昼 顾 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , The generator is the film, the night 曰 ^ Anmo correction circuit, the road. The source driving power of the 曰曰 曰曰 器 · · · 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 其 找 找 找 找 找 找 找 找; 5 Hai common electric castle plus 4 · If you apply for the supplementary to the third item, the preset electric power is transferred to _Vpmax_Vdmax, ^J voltage-free correction circuit, the source drive circuit of the crystal display is rotated to each section For the film hydraulic pressure, V-x is the voltage required to store the minimum electrical maximum width of each of the halogens. The depletion zone is maintained in a more packaged _3 remuneration (four) _ positive circuit, an operational amplifier, to the electrical connection of the wheel end (10) common voltage correction 1271685 l6600twf.doc / 006 circuit output; the output of the descent with - a first resistor, electrically connected between the inverting input terminals; a second resistor is amplified to the inverting input end of the common mountain, and the second end is grounded to be electrically connected to a third resistor of the operational amplifier Between the φ terminal and the common voltage; and the positive phase input of the 5 Hz operational amplifier - the fourth resistor, between the electrical connection terminal and the predetermined voltage. , ^ Yun ^ · Magnified phase of the positive phase input 6. If the patent application Fan Park, the preset ink is positive thunder, the same voltage correction circuit, to the preset voltage. The 'push-out voltage is equal to the common voltage minus W (four) Flip f6, wherein the preset voltage is equal to <_VnmQ" electric earth 乜 positive private path, right 曰% Hjg h P ) Vdmax, -Vpmax is the film liquid The output of the source driver circuit is reduced to the lowest medium voltage of each of the elements, and Vdmax is to maintain the depletion region of the storage capacitor of each of the lower limits of the package. The package is specifically for the common surface correction circuit described in Item 6, the electric _=^^ 'callout is connected to the power supply positive reversal: ί::: 'electrical connection to the operational amplifier's turn The terminal and the first-stage impedance are electrically connected between the inverting input 15 Otwf.doc/006 of the operational amplifier and the preset voltage; and a third resistor, between the electrical terminal and the common voltage And the positive-phase input of the operational amplifier is a fourth resistor, with the first-phase input terminal and the second terminal grounded. 9. The package is connected to the operational amplifier. 9. Each of the elements includes: a common voltage correction circuit, a thin film transistor, and a gate drive circuit with a gate + The drain electrode is connected to the thin film liquid crystal display source driving circuit; the storage capacitor connected to the thin film liquid crystal display is electrically connected between the output voltage; and the source of the thick transistor and the liquid crystal capacitor, Electrical connection between the same voltage. The source of the 浔 浔 浔 电 电 与 〇 〇 〇 〇 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如Gubai is a metal-insulator semiconductor: 1 according to the positive method, which is characterized in that: the film is provided by the d-r-r-output power plant to the common electrode of the storage capacitor of the output electric bearing, the t is called electric昼 and the common voltage are all exchanged - ^ 液晶 The liquid crystal capacitor is also electrically connected to the opposite electrode and the voltage of the element is connected to the common voltage, the round minus the read wheel The same voltage and the same amplitude, the common voltage is exhausted (four) to the preset power _ _. Electric soil 16 12716 &t :wf.doc/006 12 · If the patent range is applied, the common voltage is provided by the total voltage = voltage correction method. , insulting the film, the source of the drive is not stolen on the night of the day 13 · If you apply for the patent section of the map Chu method, where the common eDonkey is provided by the film ^_ household = total σ with the same repeated corrections . Heart, and the common voltage produced by the night and day. 14. If the patent is applied, the preset voltage is negative +, and the common voltage correction voltage is added to the preset voltage. Reading, the money output voltage is equal to the common electricity = as in the patent application scope method, wherein the preset voltage is equal to _ν I, the door pack correction party is two days = the ___ circuit of the indicator is turned to Γ-ΐ The maximum width required for the electrical multiple. - The depletion region of the storage capacitor is maintained. 16. As claimed in the patent application, where the predetermined voltage is a positive voltage, the common voltage correction voltage of 兮u is subtracted from the preset voltage. The output voltage of 30 is equal to the common electricity. 17. The method of claim 2, wherein the preset voltage is equal to, /, the source drive circuit of the same voltage correction thin film liquid crystal display = VdmaX, VPmax is the low voltage 'Vd Dirty is the voltage that will be required to reach the maximum width of each of these elements. The depletion region dimension of the two-dimensional staggered capacitor 1δ· as in the scope of the patent application, the tenth, the law 'where I — the common voltage correction structure of the elements. 4 - all are metal-insulator semiconductors 17