TW559772B - Simultaneous scan line driving method for a TFT LCD display - Google Patents

Abstract

A thin film transistor liquid crystal display (TFT LCD) has row pairs of pixels. Each row pair of pixels includes first row pixels arrayed in a first row, and second row pixels arrayed in a second row, together forming columns of pixels. First and second data drivers are provided for each column of pixels. Scan line drivers are provided for each row pair of pixels so that every pixel in a row pair of pixels is connected to the same scan line driver. Every first row pixel in a column of pixels is connected to the same first data driver, and every second row pixel in a column of pixels is connected to the same second data driver.

Description

559772 V. Description of the Invention (1) [Field of the Invention] The present invention provides a method for driving a scanning line of a thin film transistor liquid crystal display (TFT LCD) and a display thereof, especially a simultaneous Method for driving two or more scanning lines of a thin film transistor liquid crystal display and its display. '[Background of the Invention] Thin film transistor liquid crystal display (TFT LCD) is a small and flat display device, which can be found in many electrical products, and its distribution range is also very wide From the field of notebook computers and digital cameras, to the field of aerospace and medical diagnostic equipment, it is used. The thin-film transistor liquid crystal display can still provide a detailed, high-resolution picture 'and operate at low power while maintaining good color contrast and screen scanning update frequency. / Please refer to FIG. 1. FIG. 1 is a simplified block diagram of a conventional thin film transistor liquid crystal display. The thin film transistor liquid crystal display 丨 〇 is composed of a plurality of pixels 1 2 distributed in a square shape, and a plurality of pixels is composed of a plurality of pixels 丨 2, a prime column 1 OR and a pixel row 1 0C. The thin film transistor liquid crystal display W can be represented by a Cartesian coordinate system consisting of a complex number of rows, 0R and a plurality of rows, and 0c.

559772

Pixel 12 is a coordinate in the system. Please refer to FIG. 2 and refer to FIG. 1 at the same time. FIG. 2 is an equivalent circuit diagram of the thin film of FIG. Each pixel 12 corresponds to the equivalent circuit of two pairs in FIG. 2, and this equivalent circuit is composed of a thin film transistor Uhin fUm transistor (TFT) 24 and two capacitors 22a and 22b, two of which The capacitors 22a and 22b are electrically connected between the thin film transistor 24 and a common electrode 26, and the common electrode 26 can be regarded as a ground terminal common to all the pixels 12. The plurality of capacitors 22a can be regarded as a corresponding equivalent circuit of a thin film transistor array substrate (TFT array substrate) used to form the pixel j 2. However, in general, because the capacitance value of the capacitor 22a is not large enough to allow the pixel 2 to maintain a predetermined driving voltage, so that the pixel 12 can operate stably for a certain period of time, so Another electric valley 2 2 b is added here to allow the pixel 2 to store a sufficient amount of charge, thereby enabling the charge used to provide the pixel 2 2 for display to be maintained until the pixel 1 2 receives another One until the control signal is displayed. Each thin film transistor 24 is further connected to a scan line 28R and a data line 28C, and each pixel row 10R corresponds to a scan line 2 8R, and each pixel row 1 0 [= corresponds to one Data line 2 8 C, all thin film transistors 24 in the same pixel row 10R are connected to the same scan line 28R, and all thin film transistors 24 in the same pixel row 10c are connected to the same data line 28C. As mentioned above, each pixel 12 corresponds to a coordinate determined by a pixel column 10R and a pixel row i 0c, and the coordinates corresponding to each pixel 12 are different, so in order to change the pixel 1 2 light transmission characteristics, an appropriate voltage will be applied

Page 6 559772 V. Description of the invention (3) ^ ^ The pixel row 1 f falls on the corresponding data line 28C, and another voltage will be applied to the pixel row 1 located on the pixel 2 The scanning line 28R should be applied to enable the thin-film transistor 24 of the pixel 12 to be turned on to the right so that the two capacitors 22aA 22b may be charged or discharged according to the voltage applied to the data line 28C. By changing the electricity across the two capacitors 22a and 22b, the light transmission characteristics of the pixel 12 are changed, so that the entire display can be weighed, and the display image can be effectively controlled. A displayed image determines the selection of the pixel 10 and the above image is shown. The crystal display is moved two times, or the general thin film transistor liquid crystal display 10 on the front surface is operated 60 times against the mother. The complete display scan of the cat, and = will be performed for a certain pixel column 10R. Thin film transistor liquid crystal: 10 of the plurality of data line drivers 29C will be selected to each pixel on the prime column 1 0R丨 2 its individual development characteristics to determine the voltage applied to the plurality of data lines 28C, respectively, and the scanning line 2 8 R corresponding to the selected 1 0 R will be thin film transistor liquid crystal display 杲: scanning line drive The circuit 29R is activated, and at the same time the other is not selected, the scanning line 2 8 R is maintained. In the state that it is not activated, the shadow can be written to all pixels 1 of the selected pixel column 1 0R at a time. 2. The process of $ will be repeated continuously to make subsequent pixel columns 〇R was shown = Figure No. It must be noted here that the conventional thin-film transistor liquid crystal device 10 can only drive one pixel column at a time, and cannot drive $ or more pixel columns at the same time. 10R. When scanning the above-mentioned pixel array 10R, 'not only must there be enough time for the capacitors 2 2 a and 2 2 b to charge and discharge', but also the data line 29C must have enough time to be set.

559772

V. Explanation of the invention (4) Setting and driving 'If the scanning line 2 is quickly activated before the data line 29C is set, the unexpected image value will be written into the capacitors 2 2 and 2 2 b. And in turn, the thin-film transistor liquid crystal display 丨 〇 shows a situation where the diurnal surface attenuates. Another similar situation is that when there is no “sufficient” time to charge the capacitors 2 2 a and 2 2 b, it will cause insufficient voltage to be applied to the two poles of the two capacitors 22a and 22b 'and thus This makes the daytime surface similarly attenuated. In summary, it is very important to control the timing of the signals sent to the data line 28C and the stomach sweep 28R. '' As the resolution continues to increase (such as: pixels Column 10R and the increase of pixel row 10c), because the same time (such as one-sixtieth of a second) must average eight more pixel columns 10 R to perform the scanning operation, As a result, the operation of the above-mentioned thin-film thin-film transistor liquid crystal display 10 will become increasingly difficult, and this situation will also lead to the available time for setting the data line 29C and charging the capacitors 20a and 20b. It is even more short. At present, several schemes have been proposed to solve the above-mentioned problems caused by the increasing number of pixels. For example, U.S. Patent No. 6, 008, No. 250. Bran and '' The data line driver disclosed in U.S. Patent No. 6,081,250: f Juice by weight unique, so that their data line driver circuit can not be compatible with a general conventional data line drivers., Objective and Summary of the Invention] Accordingly the object of the present invention i.e. to provide a thin film can be simultaneously driven

559772 V. Description of the invention (5) Scanning line method of crystal liquid crystal display and its display, so that the scanning time of each pixel column can be extended. Another object of the present invention is to provide a simplified scanning line driving circuit architecture for driving a thin film liquid crystal display. Another object of the invention is to provide a method for driving a thin film transistor liquid crystal display and a display thereof, which can be combined with a dot inversion (row inversion) or a row inversion (row inversion) driving method to reduce the driving circuit. Power consumption (power coonsumptin). This crystal display display. The pixels are located on a pixel and a pixel can be fixed by a first data on the second and a voltage on the second data line.

In short, a method is provided for driving a thin film transistor liquid crystal (TFT LCD) and a related thin film transistor liquid crystal display. The thin film transistor liquid crystal display includes a plurality of image transistors. Plural columns are multiplied by multiple rows. Its Kth :: the position of the first column and a first row (Ri, c0, a second image like the second column and the position of the first row (R2, c0) = the first column (R1 ) Is defined by the first scanning line: the ^ th line corresponds to the first line (C). The first pixel of m-1 can be addressed by a first known drawing line corresponding to the line C ^, and —

One line (C〗). The method firstly corresponds to the first ^ line and 嗲 ^ and the first predetermined voltage and, and the first pre-voltage and the first pre-voltage respectively.

Page 9 559772 V. Description of the invention (6) ^ The display state that the first pixel wants to set and the second pixel that you want to set ", the status of the staff member: After that, the first scanning line and the The bit position of the second scanning line is set as a scanning voltage. Therefore, one of the present invention can be that the first scanning line and the second scanning line can share a tracing driver. Another effect of the present invention is By driving more than two scans at the same time, the scanning time of the scan line can be extended, and the structure of the drive circuit of the scan line can be simplified. [Detailed description of the invention] Simplification: ㊁LCD: 30 elements 34, and by a plurality of images | f a plurality of pixels distributed in a square image of a plurality of pixel rows 34C. Each image Ding Xin " number of pixel columns 34R and complex control, so that the picture can lead to a clear two; The light characteristics are well received. &Quot; Please refer to Figure 4 for the thin-film transistor LCD 30, and refer to the equivalent electric diagram of the LCD 30 at the same time. 34 series consists of a corresponding capacitor ^ \ In the 4-effect circuit diagram 40, each pixel 34 is formed on a glass panel 32 ±, and the capacitor 443 is equivalent to the above.

surface

Page 10 559772 V. Description of the invention (7) 44a to represent the pixel 34 is similar. Also, to ensure the voltage value across the pixel. Each capacitor controls this driving terminal to form a preset electro-imaging characteristic. In addition, the same electrode 4 6 is shared with the conventional thin film transistor liquid crystal display. Another additional capacitor 44 b is used to provide sufficient charge 3 4. The display voltage of the two electrodes can be maintained at a predetermined 4 4 a and 4 4 b is a reference voltage crystal 42 which is the same as the corresponding driving transistor 42, and is used for the two electrodes of the capacitors 44a and 44b, and this preset voltage and voltage will control each capacitor 44 level of the pixel 34 44b is also connected to a common electrode 4 6 series to provide all the pixels 3 4 a total of the thin film transistor liquid crystal display 30 of the invention 30, a plurality of pixel columns are divided into a plurality of pairs of pixel columns 40P, and each $: J Pixel column 34R, one pixel column 34R is defined as: 3 pixels and 2 pixels, W pixel column 3 is defined as a second pixel column 40s, and each pixel 34 on a / column 40F is defined as a The first column and the second column # The second pixel column 40 allows each pixel 34 to be defined as a line—each—the first pixel column 40f has a corresponding first scan all connected to the iJlT temple bar first pixel column 4 The first scan line 48F corresponding to all driving transistors 42F on the 0F. Similarly, each if element row 40S has a corresponding second scanning line 48s, and the 7th driving transistor 11 42 in the same second-scanning second are all connected to & its corresponding: on Π; for pixel column_ one corresponding common scan line

The corresponding common scan line driver 41 is connected ..., for ^ 二 对 G

Page 11 559772 V. Description of the invention (8) For column 40P, the first scan line 48F and the second scan line 48s are connected to the same common scan line driver 4 丨, so the required number of common scan line drivers 4 丨It will be equal to half the number of all the pixel columns 34R of the thin film transistor liquid crystal display 30, which can effectively reduce the total number of electronic components included in the thin film transistor liquid crystal display 30. The thin film transistor liquid crystal display 30 also includes a plurality of first data line drivers 43F and a plurality of second data line drivers 43S. Each first data line driver 4 3 F is used to drive a corresponding first data line 4 9 F, and each second data line driver 4 3 S is used to drive a corresponding second data line 4 9 S '. Therefore, each row of pixel rows 3 4 C includes a corresponding first data line 49F and One corresponding second data line 49S. In ^ one pixel row 34C, each driving transistor 42 for driving the first column of pixels 34F is connected to the same first data line 49F 'and thus connected to the same first data line driver 43F. Similarly, in the same pixel row 34C, each driving transistor 42 for driving the second column of pixels 34S is connected to the same second data line 4 9 S ′ and thus is the same as the second data line driver 4 3 s相 连接。 Phase connection. Each first data line driver 43F is disposed on a first side 30F of the thin film transistor liquid crystal display 30, and each second data line driver 43S is disposed on a second side of the thin film transistor liquid crystal display 30 3 〇S, where the first side 30 F and the first side 30 S are opposite each other, so the thin film transistor liquid crystal display 30 can reserve a considerable space in width or height to place and separate the first The data line driver 4 3 F and the second data line driver 4 3 S, and such a design prevents the components of the thin film transistor liquid crystal display 30 from being set

Page 12 S59772 V. Description of the invention (9) It is too crowded, which can simplify its process and improve the heat dissipation efficiency of the thin film transistor. It should be noted that different data lines, actuators 43F and 43¾ are used to drive the first column of pixels 34F and the second column of pixels 34S on the same ordered pixel row 34C of the same pair of pixel columns 40p, so the same-pair All pixels 34 of the pixel column 4 0 P can be driven simultaneously to display a picture. The thin film transistor LCD display is used for scanning. The number of steps required for the entire screen is therefore only half of the number of steps required to scan the entire LCD surface. In the case of resolution and frame rate, the time that each scanning operation can be performed is twice the original Λ =, and the scanning time that each pixel column 34R can go through is the first asset: line ^ line The drive / \ 43F is used to drive a pair of drive-bars and data buses: two = line drivers _ ^ contains-strips corresponding to; bus :; pixel row 34C package two data 绫 4QS ^ ^ m Beco line 49F And one of its corresponding numbers: nr ϋ ^ ^ t Λ ^ ^-^ ^-t # ^ 49s Same-display frame (Frame) 2 '= catty; = each pixel 34, applied between polar phases. That is, the driving voltage applied to the flute is opposite to the voltage applied to each pixel 34;

The 13th stomach 559772 V. Description of the Invention (ίο) The electricity applied to each pixel 34 driven by the data line driver 43S is the same polarity ', but the polarity is opposite. Until the next frame is displayed, the polarity of the driving voltage of the first data line driver 43F and the second driver 43S is reversed. In this way, during the same frame, the v (Frame) 'first data line driver 43 sniffs the second data line driver Ss 43s to maintain their respective drive electrical waste polarity, avoiding frequent polarity reversals, and lower the first data driver 43F. And the power of the second data line driver 43S (Power Consumption). 2Refer to Figure 5 and refer to Figure 3 and Figure w at the same time. Figure 5 is the signal timing diagram of the thin film in Figure 3;; == 3 °. When you want to display the image data through m: liquid display 30, it includes the following steps: τ w Step (1): The line control circuit 47 selects a pair of pixel columns 40p as the input data. And thus selected-the corresponding 9: ra Γ, driver 4 1 'this target scan line driver 4 1 ^ Λ drives the first line 48F and the second scan line in the selected pixel column 4 oop. 48S. The scanning line control circuit 1 causes the target scanning line driver 41 to be converted into an operable state. The scanning line driver 41 applies a scan ^ (N) to the selected pair of pixel columns 40P at the same time (2). Line 48F and the second scanning line 48S. #: ϋΐ: The line control circuit 47F causes each first data line driver 43F to output an output voltage Data_F, so that it is selected to

Page 14 559772 V. Description of the invention (11) All the pixels 34F in the first column of the pair of pixel columns 40P can exhibit the expected light transmission characteristics. Similarly, the second data line: the system 47S urges each second data line driver, 43 to output a voltage Data—S, so that all the pixels in the second column of the selected object 2 lop are selected. 34S can show the pre-stepped (with light transmission characteristics.-). The line when a predetermined time can be guaranteed to ensure that each capacitor 4 ", 4 i are properly charged by f to meet its development needs The control circuit 4 converts the target scanning line driver 41 into an inoperable state to stop the pair of pixel rows 40P, and simultaneously selects another pair 1 and simultaneously applies another scanning line voltage. Scanning & 4 In addition, the second drawing line 48F and the second scanning line 48 in the selected pixel column 40P are repeatedly executed in step (1). The process is set at another f of the present invention: the most important point V of the column pixel column V Middle: f:-The embodiment simultaneously drives the element column composition-groups of pixel columns to simultaneously f 'in the embodiment is to connect three columns like two data lines. Please drive the old and t, and each row of pixels is connected to the example thin film. Crystal liquid crystal display; JJ VI is the second embodiment of the present invention. Each group of pixels has a pixel row 50F, a second pixel row 50s and a 559772. V. Description of the invention (12) Three pixel row 50T, in which the same group of images + 50S and 50T are imaged by the same scan line element Among column 50F and row 50C, I is driven by a flute. In the same row like-# ^-t ^ ^ > The driving transistor 52 of pixel 50F is connected to the same line 59F, female one The second pixel 50s is connected to the same second data line 59s, and a J-ray solar body 52 connected to the body 5 2 is connected to η 纮 potential ^ The driving electric solar body 52 of the mother first pixel 50 T is connected There is a third data line 59T. Each row contains its own data line combination 59F, 595, and 59T, and any one of the lines is connected to the corresponding data line driver. Please refer to Figure VII. Signal timing diagram of the six thin-film transistor liquid crystal display. I & Start driver 51 For the initial set of pixel columns 51T, the out state, S (N) is used to indicate the output state of the subsequent scan line driver 51, Data —F Used to indicate the signal of multiple first data lines 59F, other Data — S is used to indicate the multiple second data lines 59 A signal of 3, ^^ is used to indicate a signal of a plurality of third data lines 5 9 T. Compared with the conventional technology, the present invention discloses a method that can drive more than two pixels at the same time with a single scan line driver. Column method and electrical: architecture, so that all pixels in the same group of pixel columns can be driven simultaneously. In addition, the circuit architecture of the present invention can also be made with traditional drivers, so the overall circuit can be further Furthermore, the data line driver can be disposed on two opposite sides of the thin film transistor liquid crystal display, thereby reducing the difficulty of circuit layout, making it highly dispersed, and simplifying the manufacturing process. ..., very efficient

559772

Page 17 559772 Simple description of the drawings [Simplified illustration of the drawings] Figure 1 is a simplified block diagram of a conventional thin film transistor liquid crystal display. FIG. 2 is an equivalent circuit diagram of the thin film transistor liquid crystal display of FIG. 1. FIG. Figure 3 is a simplified block diagram of a thin film transistor liquid crystal display of the present invention. -Figure 4 is the equivalent circuit diagram of the thin film transistor liquid crystal shown in Figure 2. Figure 5 is a signal timing diagram of the thin film transistor liquid crystal display of Figure 3. FIG. 6 is an equivalent circuit diagram of a thin film transistor liquid crystal display according to a second embodiment of the present invention. FIG. 7 is a signal timing diagram of the thin film transistor liquid crystal display in FIG. 6. [Description of Symbols] 30 TFT LCD 30F First Side 30S Second Side 32 Glass Panel 34 Pixel 34C Pixel Row 34F First Column Pixel 34R Pixel Column 34S Second Column Pixel 40 Equivalent Circuit Diagram 40F No. One pixel row 40S second pixel row 40P pair of pixel rows 42 driving transistor 43F first data line driver 43S second data line driver 44a capacitor 44b capacitor 46 common electrode

Page 18 559772 Brief description of the diagram 47F The first data line control circuit 47R The scan line control circuit 47S The data line control circuit 48F The first scan line 48S The second scan line 49F The data line 49S The second data line 50F The — — Pixel column 5 0S First pixel column 50T Pixel column 51 Scan line driver 51T. A group of pixel columns 52 drive transistors 59F first data line 59S second data line 59T third data line

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Claims (1)

559772 VI. Application Patent Scope 1. A method of driving a thin film transistor liquid crystal display (TFT LCD) 'The thin film transistor liquid crystal display includes a plurality of pixels, and the plurality of pixels Columns are multiplied by plural rows, where a second pixel is located on a first column and a first row (Ri, Cl), a second pixel is located on a second column and the first row (R2,. CiXh, the first pixel may be addressed by a first scanning line corresponding to the first column (R0, and a first data line corresponding to the first row (C)), and the first Two pixels may be addressed by a second scan line corresponding to the second column (RD, and a second data line corresponding to the first row (CD, the method includes: 々 the first data line and the The potential of the second data line is set to a first predetermined voltage and a second predetermined voltage, respectively, and the first predetermined voltage and the second predetermined voltage respectively correspond to a display state desired to be set by the first pixel and the second Pixel preference Display state; and set the potentials of the first scanning line and the second scanning line to a scanning voltage at the same time. The first and second lines are described in the form of a range; The items include a total of 1 to connect * -gc. The same line scans the second line and the line scans the first line. This pressure scans the current time line to the line, and sets the drive line for the drive. Scanning the same line of the scan line, the second line of the scan is described. A thin film transistor (thin film transistor) Page 20 559772 6. Patent application scope (liquid crystal display, TFT LCD), which includes: a first pixel column connected to a first scan line driver, and each pixel on the first pixel column is further connected with a plurality of pixels. One of the first data lines is connected; and a second pixel column is connected to the first scan line driver, and each pixel on the second pixel line is in phase with one of the plurality of second data lines. connection. The first device is the moving fan line, and the application materials are required. The first one is 4.1. The first device displays the crystal liquid crystal IP, the 5-rppr film is thin. 3 The first, the actuator drives the display device. Crystalline fluid drive body line crystal material electric power film a thin line should be set to the opposite side of the line side material side \ The second line should be set to the opposite side of the line by the device line drive line information In the second case, the first and second images of the side drive side of the vehicle must be applied to the third column. If a prime is connected with a link like 5 with a three-phase package, the device displays the crystal liquid crystal rjnir with a thin film. Item 3 of this one and the other 'its dynamic drive wire description. Counting on multiplexing and connection, prime 6: Thin film transistor liquid crystal display (TFT LCD), which includes: • a plurality of pairs of pixel columns (a multiple r0w pairs 〇You p 1 xe 1 S) 'Each pair of pixel rows contains a plurality of rows along a first pixel row Page 21 559772 VI. Scope of patent application 1 ---------- ίί: Form a plurality of pixel rows with a plurality of second columns and a plurality of columns arranged along the second pixel column; then; 1—Shell line driver, connected to the plurality of pixels in the first column; = number: f line driver, connected to the pixels in the second column-pair ί Ϊ ΐ drive $, connected to the pixel pairs in the plurality , And the mother-pixel of the same j. Φ >-is connected to the same scan line driver;-the i-line: ^ bit :, row "pixels are connected to the same A second row of pixels located in the same line are connected to the first data line driver. Erchu 5 ί Τ surrounds the thin film transistor liquid crystal display of item 6, where each g — i 1, the driving state is set in the Thin film transistor liquid crystal display, and each second data line driver is disposed on the opposite side of the first side. 8 thin film transistor liquid crystal displays (thin fi lm transistor liqui-d crystal display, TFT LCD) ), Which contains: -Similar ί ί 素素 'each group of pixel columns package There are three pixel columns, each of which contains a plurality of first rows of images arranged along a first pixel row, two i ^ rows of pixels in a second row arranged along a second pixel row, and a plurality of ^ ϊ ί The third column of pixel columns is arranged like *, and the plurality of pixel columns form a plurality of pixel rows; Page 22 559772 VI. Application scope: Multiple first data line drivers are connected to the pixels in the first column; multiple second data line drivers are connected to the pixels in the second column; multiple third data A line driver is connected to the plurality of pixels in the third column; and a plurality of scan line drivers are relatively connected to the plurality of pixel columns, and each pixel in the same group of pixel columns is connected to the same scan line driver; One pixel in the first row of the peer is connected to the same first data line driver, each pixel in the second row of the peer is connected to the same second data line driver, and each pixel in the third row of the peer is Connected to the same third data line driver. 9. The thin film transistor liquid crystal display according to item 8 of the application, wherein each first data line driver is disposed on a first side of the thin film transistor liquid crystal display, and each second data line driver is disposed on Opposite the first side. Page 23