TW516011B - Liquid crystal display and driving method thereof - Google Patents

Abstract

Disclosed is an LCD and driving method thereof. The present invention comprises an LCD panel, a gate driver, a data gray signal modifier and a data driver, and generates modification gray signals by considering m-bit gray signals of present and previous frames among the n-bit gray signals received from a data gray signal source and supplies the generated modification gray signals to pixels so as to improve response characteristics of the LCD. According to the present invention, pixel voltages directly reach desired target level without frame delays. Hence, the liquid crystal response speed can be improved without changing a configuration of a TFT-LCD panel. Further, by using the m bits of the gray signals, the number and capacity of the memory needed for modification of the data voltage can be reduced, thereby improving panel yield and reducing the cost.

Description

516011

V. Description of the invention (Printed by the Intellectual Property Bureau Employee Consumer Cooperative of the Ministry of Economic Affairs. Background (a) Field of Invention The present invention is related to a liquid crystal display (LCD) and its driver. Compensation in order to change the driving method of a / anti-Japanese response speed. (B) Relevant technical descriptions, such as: the weight of the personal computer (PC) and television has become lighter and the thickness is larger. According to this, a flat-type Gu Shi crying, such as replacing a cathode ray tube (CRT) with an LCD, has been developed. In this LCD, an electric field is supplied to the dielectrics with different orientations @ 电 Constant The liquid crystal material is incorporated into the two substrates, and the amount of light projected on the substrates is controlled by the electric field strength, thereby obtaining the required image signal. This type of LCD is one of the most popular portable flat-panel display devices. In particular, when a switching device is widely used, the thin film transistor liquid crystal display (TFT-LCD) uses the TFT. When the TFT-LCD has been widely used as a display device of the computer and television, the demand for constructing the moving image has increased. However, since the conventional TFT-LCD has a delayed response speed, it is difficult to construct a moving image using the conventional TFT-Lcd system. In order to solve this delayed response speed problem ', another type of TFT-LCD is developed using an optical compensation band (OCB) mode or a ferroelectric liquid crystal (FLC). However, the conventional TFT-LCD panel structure must be modified to use the OCB mode or FLC. Invention Invention -4-This paper size is applicable to China National Standard (CNS) A4 specification (210 X 297 public love) ----------- Installation ----- 1 .--- Order- -------- Line (Please read the precautions on the back before filling this page) 516011 V. Description of Invention (2) The purpose of this January is to modify the liquid crystal driving method without modifying the TFT-LCD structure To enhance the response speed of the liquid crystal. In a clear view, a liquid crystal display (LCD) includes an LCD 〃 G including a plurality of gate lines for transmitting a scanning signal; a plurality of data lines insulated from the gate lines and crossing them to transmit a data voltage. ; And a plurality of pixels formed by an area surrounded by the gate line and the data line and arranged into an array pattern having a switching element connected to the question line and the data line; one for sequentially supplying the scanning signal to the gate line Gate driver; one for receiving the n-bit grayscale # from the source of the gray-scale signal source of ^ data, green (g), and blue (JB) and considering the n-bit grayscale signal Middle present and month) m-bit gray-scale signals in the surface bit to output data gray-scale signal modifiers that modify the gray-scale signals; and a data gray-scale signal corrector for changing the modified gray-scale signals into corresponding data voltages and supplying the data voltages资料 Data driver for data cable. ^ The data grayscale signal corrector includes a picture storage device for receiving the m-bit grayscale signal from the data grayscale signal source, storing the grayscale signal during a single picture period, and outputting the grayscale signal. A controller for controlling the gray-scale signal written to and reading the picture storage device; and a m-bit gray-scale signal for the current day transmitted by the data gray-scale signal source and a The m-bit grayscale signal of the previous day and plane transmitted by the screen device, and a data grayscale signal converter that generates the modified grayscale signal and outputs the I positive grayscale signal. In another aspect of the present invention ... including many interpolar wires; many data wires insulated in the gate wires and passing through them; and-quilted wires and materials CNS) A4 specification (210 X 297 mm) Order 4 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 516011

2. Description of the Invention (3) A liquid crystal display (LCD) with many pixels formed by an area surrounded by printed material lines of the Employees' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs and arranged to have an array pattern of switching elements connected to the gate lines and shell material lines ) In the driving method, an L c D driving method includes the following steps: • Sequentially, right. Scanning between polar lines; receiving n-bit gray-scale signals from a data gray-scale signal source and borrowing Consider generating m-bit grayscale signals in the n-bit grayscale signal and current m-bit grayscale signals to generate a modified grayscale signal; and providing a data voltage corresponding to the modified grayscale signal generated by the soil to the data line. The steps of the gray-scale signal include the steps of: delaying the m-bit tl gray-scale ^ number in the n-bit gray-scale signal transmitted from the gray-scale 仏 number source in at most one single picture; by considering the gray-scale of the material The current m-only gray-scale signal received by the signal source and the gray-scale delay number of the bit delay of the previous picture generate the first m-bit modified gray-scale signal; and the unmodified and passed (η- m) 仏 το added to the first The m-bit correction gray-scale signal generates a second n-bit correction gray-scale signal. A brief description of the J formula integrates and forms a part of the description to illustrate a specific embodiment of the present invention, and together with the description To illustrate the principle of the present invention: FIG. 1 shows an equivalent circuit diagram of an LCD pixel; FIG. 2 shows that it is not provided by a conventional driving method; initial force / left catching voltage and pixel calendar; FIG. The conventional driving method transmits the L cd; FIG. 4 shows a modular system between the voltage and the dielectric constant of the L c D; FIG. 5 shows a first preferred “provided embodiment” according to one of the present invention. Real power off the lull ----------------- (Please read the precautions on the back before filling this page) This paper size applies Chinese National Standard (CNS) II ^: (21 〇x 297 public love) A7 V. Description of the invention (4 B7 data voltage method;… Figure 6 shows if the LCD according to the second-second material voltage of the present invention & Fork specific implementation examples to provide This, figure shows that if the number of Y according to the present invention is two, and the voltage of the LCD is not too high, fortunately, Father Jia specific Example to provide ^ 4 黾 often stupid. Figure 8 shows a better and touch according to the present invention ~ Figure 9 shows a CD according to the present invention "transformation of the Qiguan Example; another embodiment of the intellectual property of the Ministry of Economic Affairs Bureau Consumer Consumption Cooperative Printed Figure 9 shows the positive device Figure 10 conceptually shows the operation of the material voltage corrector according to the present invention; and Ang-the preferred embodiment This figure shows a conceptual display according to the present invention ^ The operation of the material voltage corrector. The preferred embodiment of Ang Er should only be shown and explained in the following detailed description, simply using Che Fujia's specific embodiment has been explained in the best mode. As understood, this =: The inventor thought about it; =! 郅 The modification did not deviate from the present invention. Based on this, the diagram is naturally regarded as an illustration and not as a limitation of the stoppage. The LCD includes a plurality of pole lines that transmit scanning signals, a plurality of data lines that pass through the space and convey image data, and are formed by the gate lines and data lines and pass through the question lines, data lines, and switches. Components to interconnect many pixels. Each pixel of the LCD can be modularized into a capacitor with a liquid crystal with the same dielectric nature, that is, a liquid crystal capacitor, and Figure 丨 shows the data voltage of this embodiment. (Please read the back of the first Please fill in this page again for notes) «Binding --------- ^ w— This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 516011

V. Description of the invention (5 An equivalent circuit of an LCD pixel. As shown, the LCD pixel includes-has-a source connected to a data line Dm and a gate connected to a _ pq gate line S η Thin film transistor (TFT) 10, a liquid crystal capacitor C 1 is connected between the terminal of 1 ¾ TFT 10 and a common voltage Vcom, and a turn of six— 叩C st is connected to the gate electrode 10 of the TFT 10 and the gate electrode 0 N 仏 is supplied to the gate line Sn to turn on the TFT} 〇 The data voltage vd to the 3 ohm line should pass through the TFT 10 is supplied to each pixel electrode (not shown). Then, an electric field-corresponding to-between the pixel voltage VP supplied to the pixel% pole and the common voltage Vcom is supplied to the liquid crystal (as shown in FIG. The liquid crystal capacitor in the figure i) allows the light, spring to penetrate the TF τ in a transmission mode corresponding to the electric field strength. At this time, the pixel voltage Vp is continued during a frame. The storage is used in an auxiliary way. The capacitor C st is used to continuously supply the pixel voltage Vp to the pixel electrode. Since the liquid crystal has each The dielectric constant of the anisotropy is sufficient depending on the direction of the liquid crystal. That is, when the liquid crystal director changes with the voltage supplied to the liquid crystal, the dielectric constant is also changed. The capacitance of the liquid crystal capacitor (which will be referred to as the liquid crystal capacitor) is also changed. The liquid crystal capacitor is changed while the TFT is turned on, and thereafter, the TFT is then turned off. If the liquid crystal capacitor is changed, the The pixel voltage Vp of the liquid crystal is also changed, and thereafter, q = cv. For a normal white mode twisted array (TN) LCD, when zero voltage is supplied to the pixel, the liquid crystal capacitor C (0V) becomes ε 丄 A / d, of which, when -8- this paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this page)

li -------- Order --------- Line I Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 516011 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention ( 6) When the liquid crystal molecules are arranged in a direction parallel to the LCD substrate, ε 丄 represents the dielectric constant, that is, when the liquid crystal molecules are arranged in a direction perpendicular to the direction of light, '' A 'represents the lc D substrate area, and d 'represents the distance between the substrates. If the voltage system used to construct an all-black screen is set to 5 V, when the 5 V voltage system is supplied to the liquid crystal, the liquid crystal system is arranged perpendicular to the substrate direction. Therefore, the liquid crystal capacitor C (5 V) becomes ε " A / d. In the example of the liquid crystal used in the T N mode, ε η _ ε 1> 0, so as the pixel voltage supplied to the liquid crystal becomes larger, the liquid crystal capacitance becomes larger. The T F T number must be charged so that the n-th frame of the all black is c (5 V) X 5V. However, if it is assumed that the (n-i) th frame is completely white (Vw = 0v), the liquid crystal capacitor becomes C (OV) because the liquid crystal has not reacted during the T F T on period. Therefore, even when the 5th data voltage vd is provided to the pixel by the n-th frame, the actual charge number provided to the pixel becomes c (〇v) χ 5V, and since C (OV) < C (5V), A pixel voltage lower than 5V (for example, 3.5V) is actually supplied to the liquid crystal, and the full black is not framed. In addition, when the (η + 1) -th frame is supplied with 5 V data voltage V d to construct a full black frame, the amount of charge provided to the liquid crystal becomes C (3.5V) X5V, and accordingly, the voltage Vp supplied to the liquid crystal is Has a range between 3 · 5ν and 5V. After repeating the above processing steps, the knee pixel voltage V p reaches a required voltage after several frames. The above description will now be described with reference to the gray scale. When a signal supplied to a pixel (a pixel voltage) changes from a lower gray level to a higher gray level (bite from a car parent 咼 gray level to a lower gray level), now the daytime surface is affected by a Previously affected by the gray level of the gold surface, the gray level of the picture now reaches the required -9 after a few pictures. ------ (Please read the notes on the back before filling this page) This paper is suitable for size @ 定 χ 297 公 爱) &160; V. Description of the invention (

Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. In a similar way, because of the current scholars and women, and waiting for this,-the dielectric constant of the dysentery is reached after a picture-the demand. The pixel (dielectric constant is about black if the (η-1) picture is completely black, that is, the pixel voltage is 5V, and the n-th picture is supplied with 5V data voltage to construct the full black writing. Since the liquid crystal The capacitance is C (5V), and the amount of charges across the bank to w,,-, and 'do 4 ^ C (5V) x 5V is charged to the pixel, and therefore, the pixel voltage V p from day to day becomes 5 V. Therefore, in fact, the packing pressure V p of the image supplied to the LCD is determined by the supply voltage to the current surface and the pixel voltage Vp of the previous screen. Figure 2 shows the supply using a conventional driving method. Data voltage and pixel voltage. As shown, the data voltage vd corresponding to the-target pixel voltage Vw is supplied to each picture on the system regardless of the pixel voltage vp of the previous picture. This: The actual pixel voltage supplied to the LCD ~ The voltage lower or higher than the target pixel voltage is about the pixel capacitance corresponding to the previous picture as described above. Therefore, 'the pixel voltage force reaches the target pixel voltage after a few pictures. Figure 3 shows according to A conventional driving method transmits the L c β = 'Shown': the actual pixel voltage is lower than the target voltage, and the electrical constant reaches the target dielectric constant after a few frames, even when the liquid response time is within a frame. In a preferred embodiment of the present invention In the example, the image letter% of one of the screens now should be pressed to the media ----------- install ----- ·· --- order --------- Line 0 ^-(Please read the precautions on the back before filling in this page} —h is called》 — 1 in n series and —. The previous picture of-image signal Sn_w is compared to generate the number repair -10-

516011 A7 V. Description of the invention (8 The positive signal Sn is printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, and the correction figure is L # Sn 丨 for long-term and long-time use. The image signal S η stands for Each pixel. However, because the two-bit gray-scale code is used to generate the voltage, the actual voltage supplied to the pixel is implemented in the digital driving method. The inter-correction voltage is determined by correcting the gray. If the image signal of the current picture (the grayscale signal or data voltage) is the same as the image signal of the previous picture, no correction will be performed. Magic-Second 'If the grayscale signal of the current day (or the Data voltage) is higher than the grayscale signal of the previous screen. 'Then-higher than the current grayscale signal (data voltage). The corrected grayscale signal (data voltage) is output. Is lower than the previous gray level signal, then—the modified gray level signal (data voltage) lower than the current gray level signal (data voltage) is output. At this time, the degree of correction is proportional to the current gray level signal (data Voltage) and previous grayscale signal Data voltage). Third, the modified grayscale signal is obtained by modifying some bits of the grayscale k number supplied by the grayscale signal source of the data. At this time, the uncorrected bits are released. That is, When receiving the n-bit gray scale signal from the data gray-scale signal source, 'the modified gray-scale signal is obtained by modifying the m-bit of the n-bit gray-scale signal. At this time, the' m, bit represents The remaining bits obtained by subtracting the number of bits (i = 1, 2, ..., η-1) from the n-bit grayscale signal starting from the least significant bit (LSB). That is, The m bit indicates the (n-1) bit. A method for modifying the data source according to a preferred embodiment will now be described. -11-This paper size applies the Chinese National Standard (CNS) A4 specification (21〇x 297mm) Xianxinlailaiyuan gray number display pressure (Please read the precautions on the back before filling out this page} Install ----- y Order --------- line Φ. 516011

V. Description of the invention (9) Printed in Figure 4 by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, which shows the TF — the modular relationship between the 涊 voltage and the dielectric constant of the L c D. As shown in the figure, the S-axis represents the pixel voltage. And the straight axis represents a dielectric constant ε (0) at a preset pixel voltage V and the liquid crystal system is arranged parallel to the substrate, that is, the number of dielectric reeds when the liquid crystal system is perpendicular to the direction of light penetration The ratio 丄 between ε 丄. The maximum 値 of ε (〇 / ε 丄, that is, ε " / ε 丄 is assumed to be 3, 'Vth is 1 V, and Vmax' is 4 V. Here, the 'Vth , And 'Vmax, respectively, represent the pixel voltages of the all-white and all-black (or so on). When the capacitance of the storage capacitor (which will be referred to as the storage capacitor) is set to the average of the liquid crystal capacitor 値 < Cst > is the same, and the B (: 1) substrate area and the distance between the substrates are set to 'A,' and 'd, respectively, and the stored power valley Cst can be expressed by Equation 1. Equation 1

Cst = < Cl > = (l / 3)-(ε / y + 2 £ l)-(A / d) = (5/3)-(ε 1-A / d) = (5/3)- C0 where C0 = ε 丄 .A / d. Referring to FIG. 4, ε (ν) / ε 丄 can be expressed by Equation 2. Equation 2 ε (ι〇 / ε 丄 = (l / 3). (2V + l) Since the total capacitance C (V) of the LCD is the sum of the liquid crystal and the storage capacitor, the capacitance C (V) can be derived from the formula 1 and 2 are represented by Formula 3. Formula 3 C (V) = Cl + Cst = ε (v). (A / d) + (5/3) .C0 = (1/3). (2V + 1) -12- This paper size is applicable to Chinese national standard (CNS> A4 size mo X 297 mm)------------- install ----- L --- order- ------- Line 41 ^ " (Please read the notes on the back before filling in this page} 516011 Printed to A7 by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs V. Invention Description (1〇C〇 + (5 /3).CO II (2/3). (V + 3) .C0 Both ",: ί, should be the charge q of the pixel is retained, and the following formula 4 is established. Formula 4 Q = c (vn). v, c (vf) .vf where ςνη 'represents the data voltage supplied to the current picture (or, the absolute voltage of the data voltage of an inversion driving method), and' c (vn-1) represents the correspondence to the previous picture ( That is, the capacitance of the pixel voltage of the n-th frame), and C (Vf) represents the capacitance of the actual voltage Vf of the pixel corresponding to the current frame (that is, the n-th frame). Derived from formulas 3 and 4. Formula 5 C (Vn-i) * Vn ^ C (Vf) .Vr (2/3). (Vn.1 + 3) .Vn = (2/3). (Vf + 3) .V ^ Therefore, the actual pixel voltage Vf can be represented by Equation 6. f Equation 6

Vf = +3)) / 2 As clearly shown in Fig. 6, the actual pixel voltage v f is determined by the data voltage Vn supplied to the current picture and the previous picture 22. Pixels If the data voltage for the pixel voltage is sequentially supplied to reach the target voltage Vn on the n-th frame and is set to Vn, then the data voltage Vn can be expressed by Equation 7 in Equation 5. 'Formula 7 (νη.1 + 3) · νη' = (νη + 3) · νη Therefore, the data voltage V η can be represented by Equation 8. -13- This paper size is applicable to Chinese National Standard (CNS) A4 (210 X 297 mm (please read the precautions on the back before filling this page) ^ --------- A7 B7 V. Description of the invention (Ή) Formula 8 V 2 ^ -1 + 3 'Vn = Vn + & * Vn Eliminate the above, ¾ consider the image of the current picture + life-death v, + ^ mesh ^ pixel voltage Vn and the pixel voltage of the previous screen When Vn-1 is obtained from Equation 8 when the folly life period π r 、, and the material voltage Vn 丨, the pixel voltage can directly reach the target pixel voltage Vn. Equation 8 is derived from Figure 4 and some assumptions The data voltage Vn of the LCD is represented by Equation 9. Equation 9 Bu, Bu I vn 丨 νη μ |, · 1 |) where the function f is determined by the characteristics of the L c D. That is, 'when Vn and Vn] f = 0, when ㈣, and when I Vn | < | Vn i I £ < 〇. η I "I is the first best according to the present invention; 5 # 舍, Α 彳 彳 士, 1 脱 男, her example to supply the information is enough to explain now. Τ Figure 5 shows the The method of data voltage. As shown in the first preferred embodiment, the supply utilizes the data that takes into account the current target pixel voltage and the previously written image modification-dissatisfaction with the pixel private pressure (lean voltage) Change (because 4Vni and the pixel voltage Vpiij reach the target voltage. Also f Example Γ: The target voltage on the f-plane is different from the pixel voltage of the previous picture. Ask the voltage (below) the target voltage of the current picture to provide: In order to achieve the target voltage 'rate' under the first screen, the asset voltage is provided to the general function f as the asset for the next screen. 4 paper rule money and wealth gate -14-

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V. Description of the invention (12) The voltage printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. Therefore, the reaction rate of edge crystals can be increased. At this time, the data voltage (charge) of this correction is determined by considering the pixel capacitance of the previous day's electricity, 'Holding, including, " ^ ,, 疋' ^ flower crystal capacitors. That is, the charge Q is supplied by taking into account the pixel voltage level of the prior picture, so as to directly reach the target voltage level in the first picture. Figure 6: The tf provides the dielectric constant of the L C D according to the first preferred embodiment of the present invention. As shown, since the modified% material pressure is supplied according to the first preferred embodiment, the dielectric constant directly reaches the target dielectric constant. In a second preferred embodiment, a pixel voltage slightly higher than the target voltage Vn is supplied to the pixel. As shown in FIG. 7, the dielectric constant becomes lower than the target dielectric constant before the half of the reaction time of the S liquid EI, but after that, the dielectric constant becomes overcompensated compared to the target, causing the average dielectric constant The electric constant becomes equal to the target dielectric constant. A preferred embodiment according to the present invention will now be described with respect to an LCD. FIG. 8 shows an L C D according to a preferred embodiment of the present invention. The L C D uses a digital driving method according to the preferred embodiment. As shown ', the LCD includes a LCD panel 100, a gate driver 2000, a data driver 300, and a data grayscale signal corrector 400. A plurality of gate lines si, S2, ..., Sn for transmitting the gate ON signal and a plurality of data lines Di, D2, ..., Dn for transmitting the corrected data voltage are formed on the LCD panel 100. An area surrounded by the gate line and the data line is divided into a pixel ', and the pixel includes a -15 connected to the gate line.-This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297g t) (Please read the cautions on the back before filling this page) Order-· 516011 Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (13) Questions and answers with a link to the information The TFT 11 of the source of the line—the pixel electric guest Cl connected to the non-polar FT 110 and a storage capacitor C st 〇 The gate driver 2 0 sequentially supplies the gate 0N voltage to The gate line conducts a TFT having a gate connected to the gate line to the gate voltage supply. The data grayscale corrector 400 receives the n-bit data grayscale signal Gn from a data grayscale signal source (eg, a picture, shape signal controller), and considers the m-bit data gray of the current and previous frames. To output m-bit correction data gray-scale signal Gnf. At this time, the data grayscale corrector 400 may be an independent device or integrated into a graphics card or an LCD module. The data driver 300 converts the corrected gray-scale signal Gn 'received by the data gray-scale corrector 4 00 to the corresponding gray-scale voltage (data voltage) to supply the same voltage to the data line. FIG. 9 shows the data gray-scale signal modifier according to a preferred embodiment of the present invention. As shown in the figure, the data gray-scale signal corrector 400 includes a picture memory 4 10, a controller 4 2 0, and a data gray-scale signal converter 4 3 0. Receive corresponding n-bits r, 0, and B (red, green, and blue) grayscale signals. Therefore, the total number of bits of the grayscale signal sent to the material grayscale signal converter 4 3 0 becomes (3 X η) bits. Here, a person familiar with this technique either makes the (3 X η) -bit grayscale signal from the data grayscale signal source to the data grayscale signal corrector 4 3 0 at the same time or makes the corresponding η bit The element R, G & B grayscale signals are supplied to the same place at the same time. • 16- This paper size applies to China National Standard (CNTS) A4 ^ (210x997) 丨 --- M --- Order --------- line (please read the precautions on the back before filling this page) 516011 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (14) Referring to FIG. 9, the picture memory 4 1 0 fixes the bit or grayscale signal to be modified. The day-plane memory 4 1 〇 Receive m bits in the n-bit R, G, and B grayscale signals from the data grayscale signal source, store them in a predetermined address corresponding to the R, G, and B, and store them on a single day After the delay, it is output to the data gray level signal corrector 4 3 0. That is, the picture memory 4 1 0 receives the m-bit gray level signal of the current day and outputs the m-bit gray level of the previous picture. The signal Gn_i. The data grayscale signal converter 4 3 0 receives the (nm) bits in the current day without modification, and the m bits of the received current picture are used for correction. 4 1 〇 delayed m-bits of the previous picture Gn-1, and then the correction is generated by considering the m-bits of the current picture and the previous picture Level signal Gn .. The above description will now be provided with reference to FIG. 10. FIG. 10 conceptually shows the operation of the data voltage corrector according to the first preferred embodiment of the present invention. Assume that the data is sent from the gray level signal source of the data. The R, G, and β gray-scale signals to the data voltage corrector 400 are 8-bit signals, respectively. The 8-bit gray-scale signals sent to the data voltage corrector 400 start at the minimum The two significant bits (LSB) are not modified and they are input to the data grayscale signal converter 4 3 0. The remaining 6 bits of the current picture are input to the data grayscale signal converter 4 3 〇 Make corrections and store them in the predetermined address of the picture memory 4 1 0. Here, since the picture memory 4 丨 stores the current bit in a single picture period and then outputs it, the previous The 6-bit gray scale of the day surface -17- This paper is suitable for financial standards and standards 家 χ 297 public) · ---- ^ ---- Order --------- (please first Note on the back of the occasional reading, please fill out this page again) 516011 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 Described inventions (15) to the output line number data gray signal converter 430. The data grayscale signal converter 4 3 0 receives the 6-bit grayscale signal of the current picture and the 6-bit R grayscale signal of the previous picture, and considers the 6-bit R grayscale signal of the previous and current pictures to generate Correct the grayscale signal, add the generated 6-bit grayscale signal and the 2-bit l SB grayscale signal of the current picture ', and finally output a modified 8-bit grayscale signal Gn. In the same manner as the R grayscale signal, considering the 6-bit grayscale signals of the previous and present pictures, the data grayscale signal converter 43 outputs the modified 8-bit G and B grayscale signals. The 8-bit modified grayscale signal is converted into a corresponding voltage by a data driver and supplied to the data line. Here, the 6-bit R, G, and B grayscale signals are stored in the address created by the picture memory 410. A person who is familiar with this technique can use a single-picture memory 4 1 0 to specify the address for converting r, 0, and b, or use a three-picture memory corresponding to R, G, and B to function as the same single Screen. By referring to the description of FIG. 10, when an 8-bit gray-scale signal is input from the data gray-scale signal source, the conventional picture memory stores 8-bit r, G, and b gray-scale signals in the SXGA (1,280 X 1,024), therefore, it must be at least 30 million bits, but according to the preferred embodiment of the present invention, the picture memory 4 10 only stores 6-bit grayscale signals, thereby reducing memory Body capacity ° Here, the more the number of gray-scale signal bits stored in the picture memory is reduced, the more it is compared with the conventional art, and the more the picture memory is reduced in capacity. # This will be operated according to the second preferred embodiment. Data voltage correction-18- This paper size applies Chinese National Standard (CNS) A4 specification (21〇χ 297 mm) installed ------ r- --Order --------- line (Please read the notes on the back before filling this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 516011 A7 _____B7____ V. Description of Invention (16). Fig. 11 conceptually shows the operation of the data voltage corrector according to a second embodiment of the present invention. For easy understanding, the data voltage corrector is designed using a picture memory and a data gray-scale signal converter. However, the number of the picture memory and the data gray-scale signal converter can be changed according to the LCD panel level, the number of gray-scale signal bits, and the designer's intention. For example, three memories used to construct the picture memory and the data gray-scale signal converter can be used to process R, G, and B. A person familiar with this technology can use the first and second memory architectures to process read and write processing corresponding to R, G, and B grayscale signals, respectively, to enhance data processing speed. That is, when the grayscale signals are sequentially input to the picture memory, the odd grayscale signals are stored in the first memory, and the even grayscale signals are stored in the second memory, and when When the odd-numbered gray-scale signals are stored in the first memory, the second memory reads the first memory, and when the even-numbered gray-scale signals are stored in the second memory, the first memory Reading the second memory by the memory causes the data to be written / read from the memory of the frame 1 in a short time. Referring to FIG. 11, the architecture of the data voltage corrector 400 is the same as that of the first preferred embodiment. However, the data voltage corrector 400 according to the second preferred embodiment is different from the data voltage corrector 400 according to the first preferred embodiment in that it is according to the second preferred embodiment The data voltage corrector 400 reduces the number of bits of the output grayscale signal when reducing the number of bits compared to the input grayscale signal. Now -19- This paper rule jade applies the Chinese National Standard (CNS) A4 specification (21〇 ----- public reply) ----------- --------- -------- Line (please read the precautions on the back before filling this page) 516011 Α7 Β7 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, and a description of the invention (17) Description of the remote data voltage corrector 4 ο ο's operation.时 When the 8-bit R, G, and B gray-level signals are provided from the gray-level signal source of the data, the low-level 3 bits of the 8-bit R gray-level signal have not been modified and passed through the cross line in the figure. 'And the remaining 5 bits of the current picture are input to the data grayscale signal converter 430 and the picture memory 4o. The 5-bit r grayscale signal of the current picture input to the picture memory 4 1 〇 is stored in a predetermined address and then output in the next picture, and the previous 5-day normal R grayscale signal is output to the Data grayscale signal converter & The data grayscale signal converter 4 3 〇 then receives the 5-bit R grayscale signals of the current and previous frames G11 and Gn-1 to generate a corrected gray proportional to the difference between the current and previous frames < grayscale signals. Order signal Gn and output it. At this time, 'the modified R grayscale signal Gn' is an 8-bit signal obtained by adding the modified 5-bit and the unmodified 3-bit. Two bits of the 8-bit G grayscale signal pass through the interlaced line, and the remaining 6-bit grayscale signals G ^ are input to the data grayscale signal converter 4 3 0 and the picture memory 4 1 〇 中. Here, the diurnal memory 4 10 stores the 6-bit G grayscale signal of the current frame in a preset address, and outputs the 6-bit G grayscale signal of the previous frame Gn-1. Therefore, the data gray-scale signal converter 430 outputs a modified gray-scale signal Gn using the 6-bit G gray-scale signal of the present and previous diurnal planes. At this time, the corrected g grayscale signal Gn1 is an 8-bit signal obtained by adding the corrected 6-bit and the uncorrected 2-bit. Finally, 3 bits of the 8-bit B grayscale signal pass through the interlaced line, and the remaining 5-bit grayscale signal G η is input to the data grayscale signal converter 4 3 0 and the picture memory. 4 1 0. Here, the screen memory -20- This paper size applies to China National Standard (CNS) A4 specification (210 X 297 mm) ------------ install i——order ---- ----- line (Please read the precautions on the back before filling this page) 516011 Printed by A7, Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs, 5. Description of the invention (18) 4 1 0 The level signal is in a preset address, and a 5-bit G gray level signal of the first cropped frame Gn-1 is output. Therefore, the data grayscale signal converter 430 outputs a modified grayscale signal Gn 'using the 5-bit G grayscale signal of the current and previous pictures. At this time, the modified g grayscale signal Gn is an 8-bit signal obtained by adding the modified 5 bits and the unmodified 3 bits. As mentioned above, it is preferred that the pass bits in the 8-bit R, G, and B grayscale signals start at the LSB, and a person familiar with the art can change the number of pass bits. Therefore, the person skilled in the art can change the memory capacity and quantity and modify the data grayscale signal converter. According to the preferred embodiment, a digital circuit that satisfies Equation 9 can be manufactured as the data grayscale signal converter 4 3 0, or a lookup table is manufactured and then stored in a read-only memory (ROM). And is accessed to correct the grayscale signal. Because the corrected data signal Vn is not only proportional to the difference between the material voltage Vn-1 of the previous picture and the data voltage νη-ι of the current picture, but also depends on the absolute voltage of the data voltage, the lookup table Make the architecture simpler than calculations. With reference to FIGS. 10 and 1 1, an example in which an LCD panel is of the SXGA (1,280 X 1,024) type and provides an 8-bit grayscale signal will now be described. Traditionally, in this example, the picture memory requires at least 30 million bits, and when the R, GKB pixels are clocked in the control signal output by the controller 4 2 0, the data is grayscale The signal converter requires 5i2UKb X 6, and when each clock signal processes one R, G, and B pixels, it needs the paper size suitable for national fresh (CNs) A4 specifications (21q -------- ^- ------- (Please read the notes on the back before filling this page) -21-516011

V. Description of the invention (19 j iZRb x 3 ° 'In the example of two pixels per clock signal processing, the data gray-scale letter: 4 0 0 received 48-bit letter? Tiger. Because of the size of the bus of the memory system It is composed of 4 times, 8 times, and 6 佟; 5 D bits are two, / m one, times and 3 2 仏, and the 4 δ bit bus is constructed using two 16-bit wide memories. However, Because in the preferred embodiment of the present invention, the η bit is from the LSB to the 2, 2, ..., η], the factory 4 is operated ... η-1) is corrected and the rest is not The amount of repair can be reduced by y S picture memory volume and the grayscale signal converter 0 of the data, such as 'field η-8 and i = 2', because the 6 most significant bits need to be corrected, the remaining two bits No need to be modified, the picture memory only needs to be 1,280 X 1,024 X 6-bit 亓 = 99 Normal /,-22.5 Hundred 兀, and because the data gray-scale signal converter can use 6-bit Instead of 8-bit gray-scale table memory (512 Shit), the example of one pixel per clock signal + m inch is greatly reduced to 24 Shit, and the example of two pixels per clock signal Decrease Up to 6 X 24 仟 bits. In this preferred embodiment, some correction bits are saved in the grayscale signal. Because human eyes are not as sensitive to moving images as to solid images, it can be expected to omit that they cannot be distinguished by human eyes. Some correction bits within the range of the grayscale signal change of the moving image. Because the human eyes have different sensitivities to R, G, and B, it can be expected that the grayscale signals corresponding to the corresponding colors are omitted by omitting different numbers of correction bits. That is, because the human eye system is most sensitive to green and least sensitive to blue, it can be expected that the number of correction bits 'i' is in the order of G ^ R ^ B. -22- This paper size applies to Chinese national standards (CNSM4 specifications (210 (please read the back of the page first; 1. Matters needing attention before filling out this page)) -Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Qin Ministry of Economic Affairs 516011

V. Description of the invention (20 When the present invention has been connected and now described as a description, it will be understood that / 1 is an optimal and specific embodiment. On the contrary, it is intended to include 1 苫; The ^ t% 4 r si '㈡I, 5 corrections and equivalent arrangements are within the spirit and scope of the attached μ patent scope. According to the present invention, the modification is made to the pixel resulting in 222 million and the correction is supplied. The data voltage and μ pixel voltage reach the target voltage level. Therefore, the liquid crystal reaction speed can be improved without changing the tft_lcd & board structure diagram. Further, because only one of the n-bit grayscale signals is used, m • Bits, the number and capacity of memory required to correct the data voltage can be reduced, thereby increasing the output of the panel and reducing costs. --- Order · ---- (Please read the notes on the back before filling in this page)

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Claims (1)

516011 A8 B8 C8 D8, patent application scope 1. A liquid crystal display (LCD) comprising:-an LCD panel including a plurality of gate lines for transmitting a scanning signal; insulated from the gate lines and crossing them to transmit information资料 many data lines of voltage; and a plurality of pixels with an array pattern of switching elements connected to the gate line and the data line formed by the gate line and the area surrounding the data line; Θ- Sequentially supplying the scanning signals to the gate driver of the gate line; one for receiving the n-bit gray levels of red (R), green (G) and blue (B) corresponding to a data gray level signal source A signal grayscale signal corrector for outputting a modified grayscale signal by taking into account the m-bit grayscale signals of the current and previous bit pictures in the ^ bit grayscale k number; and a modified grayscale signal Become the corresponding data voltage and the data driver that supplies the data voltage to the data line. 2. For example, the CD of item 1 of the patent application scope, wherein the data grayscale signal corrector includes: a receiver for receiving the m-bit grayscale signal from the data grayscale signal source, and storing it in a single picture period The gray-scale signal and a picture storage device outputting the gray-scale signal; a controller for controlling the writing and reading of the gray-scale signal of the picture storage device; and a controller for considering a data gray-scale signal transmission M-bit grayscale signal of the current picture and an m-bit grayscale signal of the previous picture transmitted by the picture storage device, and generating the corrected grayscale signal and outputting 24--paper scale applicable to China National Standard (CNS) A4 Specifications (210 X 297 mm) (Please read the note on the back? Matters before filling out this page) Order --------- Line. Printed by the Intellectual Property Bureau Staff Consumer Cooperatives of the Ministry of Economic Affairs 516011 OQ888 ABCD Ministry of Economic Affairs Printed by the Intellectual Property Bureau's Consumer Cooperatives. 6. The scope of the patent application. The gray-scale signal converter that corrects the gray-scale signal. 3. The LCD of item 2 of the patent application range, wherein the number, m 1 represents the 'n, bit' of the grayscale signal minus the least significant bit (LSB) to i (i = 0, 1, ..., n-1) bits remaining. 4. As for L C D in the scope of the patent application, the number, m, varies with R, G and B. 5 · According to L C D in the scope of the patent application, the number, m 'is the maximum value corresponding to B. 6. According to the L C D of the scope of patent application, the number, m 1 is the minimum value corresponding to G. 7 · If the LCD of the second patent application range, wherein the data grayscale signal converter receives the uncorrected (nm) bit in the n-bit grayscale signal received from the data grayscale signal source, add the The received (n_m) bits are among the grayscale signals generated by considering the grayscale signals of the previous and present pictures, and an n-bit modified grayscale signal is generated. 8. According to the LCD of the second item of the patent application scope, wherein the picture memory includes an m-bit odd gray-scale signal output written to the data gray-scale signal source and a read-out of the m-bit even gray-scale signal output The first memory and a second memory that reads the m-bit odd-numbered gray-scale signal source of the data gray-scale signal source and writes the m-bit even-numbered gray-scale signal output. 9. The LCD according to item 2 of the patent application range, wherein the data is grayscale. The signal corrector corrects the grayscale signal to output a modified data that satisfies the following formula: | Vn, i vn: I-I vn I- ff (I γη I. I vn-1 I) -25- This paper size applies to China National Standard (CNS) A4 (210 x 297 mm) 1 · nnn Bn tmm— I 1 ·· — n i_l ian · an aan in · ϋ n ·. ^ ^! I wa * · aiaiv w · 苏 / ^ »7 ^ (Please read the notes on the back before filling this page) ^ l60〇U Λ8 B8 ------- D8_______ ^ ^ The scope of patent application where 'the data voltage of the current picture is set to vn and the data voltage of the previous picture is. 1 ′ is L c D according to item 9 of the scope of patent application, wherein the data grayscale signal converter uses a digital circuit to output a modified grayscale signal that satisfies the formula. U. The LCD according to item 2 of the patent application scope, wherein the data grayscale signal converter includes a storage device for storing a lookup table of modified grayscale signals corresponding to the grayscale signals of the previous and present pictures . 1 0 to 'L c D as in item 11 of the scope of patent application, wherein the lookup table specifies that the corrected data voltage is a first voltage when the positive lean voltage is greater than the first voltage, and when When the modified data voltage is smaller than the second voltage, the modified data voltage is designated as a second voltage. 13 _ A liquid crystal display (LCD) driving method including a plurality of gate lines; a plurality of data lines insulated from the gate lines and crossing them; and an area surrounded by the gate lines and material lines formed and arranged into one For many pixels having an array pattern of switching elements connected to the gate line and the data line, an L c D driving method includes the following steps, which sequentially provide scanning of the gate line; from a data gray-scale signal source Receiving n-bit grayscale signals, and considering m-bit grayscale signals of current and previous pictures in the n-bit grayscale signals to generate modified grayscale signals; and providing data corresponding to the generated modified grayscale signals Voltage to this data line. 14. The method according to item 13 of the scope of patent application, in which the revised gray scale is generated. -26- This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back first) (Fill in this page again), 1 order --------- Line · Printed by the Employees 'Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 516011 Printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A8 B8 C8 D8 The signal step includes the following steps: delaying the m-bit grayscale signal in the n-bit grayscale signal transmitted from the grayscale signal source in at most one single picture; considering the current picture received from the material grayscale signal source the m-bit grayscale signal and the m-bit delayed grayscale signal of the previous picture to generate a first m-bit modified grayscale signal; and adding the unmodified and pass (η-π) bit to the- The m-bit correction grayscale signal generates a second n-bit correction grayscale signal. 15. The method according to item 13 of the scope of patent application, wherein the number, m, represents the 'η, bit of the grayscale signal minus the least significant bit (LSB) to, i' (i = 0, 1, · · ·, η -1) remaining bits. 16. For the method ‘15 of the scope of patent application, where the number, m, varies with red (R), green (G), and blue (B). 17. The method according to item 16 of the scope of patent application, wherein the number, m, is the maximum 値 corresponding to B. 18. The method according to item 16 of the scope of patent application, wherein the number, m, is the minimum G corresponding to G. 19. The method according to item 13 of the scope of patent application, wherein the modified grayscale signal satisfies the following formula I νη · Bu I Vn 丨 Vn Bu 丨 Vn] 丨) Where the data voltage of the current screen is set to Vn The data voltage of the previous day is Vn_i. 20_ The method according to item 14 of the scope of patent application, wherein, in the step of generating the first modified grayscale signal, searching for a storage corresponding to the previous and present drawing — -------- order --- ------ line (Please read the notes on the back before filling this page) -27- 、 516011 AS B8 C8 DS, the patent application scope of the m-bit gray-scale signal, a modified gray-scale signal lookup table, and then the first modified gray-scale signal is generated. 21. The method of claim 20 in the scope of patent application, wherein when the corrected data voltage is greater than the first voltage, the lookup table designates the corrected data voltage as a first voltage, and when the corrected data voltage is less than When the second voltage is specified, the correction data voltage is designated as a second voltage. ------------ · Clothes -------- Order --------- Line (Please read the precautions on the back before filling this page) Intellectual Property of the Ministry of Economic Affairs Printed by the Bureau's Consumer Cooperatives -28- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)