TWI227347B - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display (LCD) device mainly includes a LCD panel, a plurality of driver integrated circuit (IC) chip, and a timing controller electrically connected to each driver IC chip independently for generating a corresponding start pulse (SP) to each driver IC chip in sequence.

Description

1227347 V. Description of the invention (1) Technical field to which the invention belongs The present invention provides a liquid crystal display device (1 iquidcrysta 1 display device, LCD device), especially a driver IC chip that can independently drive each driving integrated circuit chip Liquid crystal display device. The prior art has been widely used in portable information products such as notebooks and personal digital assistants (PDAs) due to its characteristics of lightness and thinness, low power consumption, and no radiation pollution. Even in the field of aerospace and medical diagnostic equipment. Please refer to FIG. 1. FIG. 1 is a schematic diagram showing a structure of a conventional liquid crystal display device 10. As shown in FIG. 1, the conventional liquid crystal display device includes a liquid crystal display panel (LCD pane 1) 12, a gate driving circuit 14 and a source driving circuit 16 for driving the liquid crystal display panel. 12 and a signal processing circuit 18 are used to input signals and generate corresponding output signals. The liquid crystal display device includes a plurality of scanning lines and a plurality of data lines (none of which are shown in FIG. 1). The liquid crystal display device is provided on a lower substrate (not shown in FIG. 1) of the liquid crystal display panel. The electrode driving circuit 14 includes a plurality of gate driving integrated circuit chips, such as 14A, 14B, 14C, etc., which are respectively used to provide a turn-on voltage (turn — ON Vo 11age) to the corresponding scanning line, the source electrode. Drive circuit 丨 6 contains complex

Page 4 1227347 V. Description of the invention (2) Several source-driven integrated circuit chips 'such as 16A, 16B, and 16 C' are used to provide a gray seal e voltage corresponding to an image signal, respectively. To each data line, and the signal processing circuit 18 includes a timing controller 20 for controlling the gate driver integrated circuit ^ chips 14A to 14C and the source driver integrated circuit chip 16A to 16C operation timing 0 In order to understand the driving method of the conventional liquid crystal display device 10 more clearly, the driving methods of the gate driving circuit 14 and the source driving circuit 16 are described separately. The following is a detailed driving method of the source driving circuit 16 . Still refer to FIG. 1. When the time controller 20 receives a horizontal synchronizing signal (HSYNC), a vertical synchronizing signal (VSYNC), and a synchronization from the outside world, such as a personal computer, When the clock signal (synchronizing clock, CLOCK), the signal processing circuit 18 will input image data (imagedata) from the outside, such as 8-bit (bit) three primary colors (red, green and blue) digital data, and then time The controller 20 will output a source-driver start pulse (SSP) to the source driver integrated circuit chip 16 A according to the received signals, so that the source driver integrated circuit chip 1 6 A starts to receive the red image data (source-driver image data-red (SDΑΤΑ-R)), the green image data (SDATA-G), and the blue image data (SD AT AB) output by the signal processing circuit 18. The received image data is stored in the source driver integrated circuit chip 16A.

1227347

V. Explanation of the invention (3): ΐ ί: The internal method of the dynamic integrated circuit chip i6A sends the source initial pulse SSPH to the next two = f, then the chip 16B in series is used to drive the source to drive the integrated circuit Jingyuan pole second action J =: pole drive integrated circuit chip 1 6B continues to capture images until ^ pole '== = = after the internal memory buffer = = i 砬 Μ 眚 枓 耷 Λ # This action will be repeated Until a water source is driven by the integrated circuit, then I ’ll tell you: I ’ll say that all the source driven circuits are from the source to the inside of each driver integrated circuit chip. Of multiple latches 5 | (丨 a tch buffer 5 has been transferred to the memory, followed by Yi Yi, Shi Cong II C th, not shown in Figure 1) internal lock 2, the receiver is then latched according to The image data according to == a digital analog converter of the inner two = Lee 1 The digital analog converter converts the number: the most moxibustion: number, and outputs it to the liquid crystal display panel 12 to drive === the gate of the liquid crystal display device 10 The drive circuit 14 is described. When the time control $ 20 receives the 谠, vertical synchronization signal, and synchronization clock signal from the outside ^ Management Road 18 will generate a -control signal and send it to the time control;

1227347 V. Description of the invention (4) The controller 20 will output a gate initial pulse GSP to the gate drive integrated circuit chip 1 4A according to the received signals, so that the gate drive integrated circuit chip 1 4 A begins to receive the control signal and latches in the internal displacement register. In the gate drive integrated circuit, each bit of the displacement register corresponds to an output. When the corresponding bit is in the corresponding bit, When the data is 1, the output is high voltage. When the data is 0, the output is low voltage. The high voltage can turn on the switching element (TFT) in the LCD panel, and the low voltage turns off the switching element. Pixels to write the correct signal. The shift register data in the gate drive integrated circuit will shift with the input c 1 ock. When this initial pulse wave moves to the last bit, the gate initial pulse wave GSP1 is transmitted in series to the next gate drive integrated circuit chip 14B, and the above steps are repeated to all the gate drive integrated circuit chips. The chip can be seen from the above. The gate drive integrated circuit wafers 14A to 14C of the conventional liquid crystal display device 10 and the source drive integrated circuit wafers 16A to 16C are connected in series, and the initial pulse wave is transmitted in series. For a liquid crystal display device, when one of the driving integrated circuit chips fails to operate normally, the initial pulse wave cannot be smoothly transmitted to the subsequent driving integrated circuit chip, so that the subsequent driving integrated circuit chip cannot operate normally. Causes abnormal display of the LCD panel, which is very dangerous for some safety-critical applications, such as aircraft cockpit panels. Summary of the Invention

1227347 V. Description of the invention (5) Therefore, an object of the present invention is to provide a liquid crystal display device to solve the above problems. According to the purpose of the present invention, a preferred embodiment of the present invention is to provide a liquid crystal display device, which mainly includes a liquid crystal display panel, a plurality of driving integrated circuit chips, and a timing controller respectively electrically connected to the driving integrated bodies. The circuit chip is used to output a corresponding initial pulse wave to each of the driving integrated circuit chip according to a timing. Since the liquid crystal display panel of the present invention mainly uses the time controller to output different initial pulse waves to each of the driving integrated circuit chips separately, each of the driving integrated circuit chips can be driven independently, so that when the integrated circuit is partially driven When the chip fails, it will not affect the operation of other driving integrated circuit chips. Embodiments Please refer to FIG. 2 and FIG. 3. FIG. 2 is a schematic diagram of the structure of the liquid crystal display device 30 according to the first embodiment of the present invention. FIG. 2 is a timing diagram of the source initial pulse wave (SSP) of FIG. As shown in FIG. 2, the liquid crystal display device 30 of the present invention mainly includes a liquid crystal display panel 32, a gate driving circuit 34 and a source driving circuit 36 for driving the liquid crystal display panel 32, and a Signal processing circuit 38, used for inputting signals and generating corresponding output signals

Page 8 1227347 V. Description of the invention (6) No. 0 Generally speaking, large-size liquid crystal display panels usually need to be driven by multiple gate-drive integrated circuit chips and source-drive integrated circuit chips. In a preferred embodiment, if the display area of the liquid crystal display panel 32 is provided with 7 6 8 X 10 2 display units as an example, the liquid crystal display device 30 of the present invention further includes 7 6 8 scans. Line and 10 2 4x3 data lines (all not shown in FIG. 20) are provided on the lower substrate (not shown in FIG. 2) of the liquid crystal display panel 32, and the gate driving circuit 34 includes 4 gates The electrode drive integrated circuit chips 34A, 34B, 34C, 34D are used to output a switch / addressing signal to the corresponding scanning line (that is, each of the electrode drive integrated circuit chips controls 1 9 2 (7 6 8/4 = 1 9 2) scan lines), and the source driving circuit 36 includes 8 source driving integrated circuit chips 36 people with 36B, 36C, 36D, 36E, 36F, 36G, 36Η, which They are used to round; one image data signal to the corresponding signal line (each source driver product Controlling wafer ^ 1 2 8 X 3 = 3 8 4 of data lines) will be explained as an example of the present invention LuShen fine. It is worth noting that the signal processing circuit 38 of the present invention also includes a time controller 40 which is electrically connected to each gate driving integrated circuit I 34A to 3 4D and each source driving integrated circuit chip 36A to 36Η. , Use & to output a corresponding gate initial pulse wave to each gate driver according to a timing sequence ^ body circuit chip 3 4 A to 3 4 D 'and output a corresponding source initial private pulse wave to each The source driver integrated circuit wafers 3 6 A to 3 6 Η. σ In addition, in the preferred embodiment of the present invention, the gate

1227347 V. Description of the invention (7) The wafers 34A to 34D and the source driver integrated circuit wafers 36A to 36Η can be set on a tape carrier package (TCP, not shown in Figure 2), and The tape and reel package is electrically connected to a printed circuit board (not shown in FIG. 2) at the same time, so that the gate drive integrated circuit wafers 34A to 34D and the source drive integrated circuit wafers 36A to 36H can utilize the tape The package is electrically connected to the corresponding scanning lines and data lines on the liquid crystal display panel 32, so the control signals from the printed circuit board can be transmitted to the driving integrated circuit chips through the tape and reel package, respectively. Input the processed signal to the LCD panel. However, the present invention is not limited to this. The gate driving integrated circuit wafers 34A to 34D and the source driving integrated circuit wafers 36A to 36H of the present invention can also use chip on film (COF) and crystal on glass. (Chip on glass, COG), or WOA (wiring on array) packaging, anisotropic conductive film (anisotropic conductive fiim (ACF)) The body circuit wafers 36A to 36Η are adhered to a flexible printed circuit (FPC) board or a lower substrate of a liquid crystal display panel (none of which is shown in FIG. 2) to reduce manufacturing costs and increase product reliability. Then, as shown in FIGS. 2 and 3, when the time controller 40 of the liquid crystal display device 30 of the present invention receives a horizontal synchronization signal, a vertical synchronization signal, and a synchronous clock signal, the signal processing circuit 38 Will input an image data ', for example, 8-bit RGB digital data of three primary colors, and then the time controller 40 will output 8 different source initial pulse waves SSP1, respectively.

Page 10 1227347

From SSP8 to relative geese & 広 Λ, each source drives integrated circuit chips 36A to 36Η, so that the scene image output from Road 38 = 1 to 36Η begins to receive signal processing electricity (which is shown in Figure 3). Be = SDATA_R 'SDATA ~ G, SDATA-B' take image data, which means that the source drive integrated circuit chip 36 reads the image data, so _ ^ source does not drive the integrated circuit chip 36 ^ read Take the image SDATA ρ s τ, push), and the received image data SDATA-R, shown in Figure '2), each stored in its internal buffer memory (not "' '^ 7, after that The time controller will input a signal to all

ίΛ Λ Circuit latches ^ to 36H are internally latched by a plurality of interlocks, and not; Tian Yizhong) are latched, and each source driver integrated circuit chip 36Α to 36Η is internally D / according to the latched image data. A converter ft is not used in & Figure 1). Finally, the D / A converter is used to convert digital image materials into analog voltage signals and output them to the liquid crystal display panel 32 to drive the corresponding data lines. . In addition, while the time controller 40 outputs the source initial pulse, the time controller 40 will also output the different initial gate pulses GSP1 to GSP4 to the corresponding gate drivers according to the received signals. Integrated circuit chips 34A to 34D to drive the gate drive integrated circuit chips 34A to 34D ', respectively, so that the gate drive integrated circuit chips 34a to 34D will start to receive the control signals output by the signal processing circuit 38, and then These control signals are respectively output to the liquid crystal display panel 32 to sequentially turn on and off the gate electrodes on the corresponding scanning lines (not shown in FIG. 2).

1227347 Please refer to FIG. 4 and FIG. 5. FIG. 4 is a schematic structural diagram of a liquid crystal display device 50 according to the second embodiment of the present invention. FIG. 5 is a timing diagram of the source initial pulse wave (SSP) of FIG. In order to reduce the complexity of the circuit of the liquid crystal display device and achieve the purpose of reducing the manufacturing cost, as shown in FIG. 4, the liquid crystal display device 50 of the present invention also includes a liquid crystal display panel 50 'and four gate driving integrated circuits. Chips 54A, 54B, 54C, 54D, 8 source driver integrated circuit chips 56A, 56B, 56C, 56D, 56E, 56F, 56G, 56H, and a signal processing circuit 58, and the signal processing circuit 5 8 also includes a The time controller 60 is electrically connected to the gate driver integrated circuit chips 54A and 54C, respectively, and is also electrically connected to each of the source driver integrated circuit chips 56A, 56C, 56E, 56G, and the gate driver integrated circuit chip 54A. And 54C are connected in series to the gate drive integrated circuit chips 54B and 54D, respectively, and the source drive integrated circuit chips 56A, 56C, 56E, 56G are respectively connected in series to the source drive integrated circuit chips 56B, 56D, 56F , 56H. Therefore, when the time controller 60 receives a horizontal synchronization signal, a vertical synchronization signal, and a synchronization clock signal, the time controller 60 will output two different gate initial pulses GSP1 and GSP2 respectively. Gate driver IC chip 54 A and 5 4 C 'and output 4 different source initial pulse waves SSP1 to SSP4 to the corresponding source driver IC chip 56A, 56C, 56E, 56G, and then The gate driving integrated circuit chips 54A and 54C will output different gate initial pulses GSP3 and GSP4 to the corresponding gate driving integrated circuit chips 54B and 54D, and the source driving

Page 121227347 V. Description of the Invention (Integrated Circuit Chips 56A, 56C, 56E, 56G will output different source initial pulses SSP5 to SSP8 to the corresponding source-driven integrated circuit chips 56B, 56D, 56F, 56H, as shown in Figure 5 (where Γ indicates that the source driver integrated circuit chip 56 A is reading the image lean material 'II indicates that the source driver integrated circuit chip 5 6B is reading the image data, and so on ). In short, the liquid crystal display device of the present invention mainly uses a time controller to output different gate initial pulse waves to each gate driving integrated circuit chip, and simultaneously output different source initial pulse waves to each source. The driver circuit chip makes each gate and source driver integrated circuit chip of the present invention be independently driven, so when some gate or source driver integrated circuit chips fail, it will not affect other driver integrated circuits. The operation of the chip. The above description is only a preferred embodiment of the present invention, and any equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the patent of the present invention.

Page 13 1227347 Brief description of the drawings Brief description of the drawings Figure 1 is a schematic diagram of a conventional liquid crystal display device. FIG. 2 is a schematic structural view of a liquid crystal display device according to a first embodiment of the present invention. FIG. 3 is a timing diagram of the initial pulse wave of the source in FIG. 2. FIG. 4 is a schematic structural view of a liquid crystal display device according to a second embodiment of the present invention. FIG. 5 is a timing diagram of the initial pulse wave of the source in FIG. 4. Description of Symbols 10 Liquid crystal display device 12 Liquid crystal display panel 14 Gate drive circuit 16 Source drive circuit 14A, 14B, 14C Gate drive integrated circuit chip 1 6 A, 1 6 B, 1 6 C Source drive product Body Circuit Chip

Page 14 18 Signal processing circuit 20 Time controller 30 Liquid crystal display device 32 Liquid crystal display panel 34 Gate driving circuit 36 Source driving circuit 34A, 34B, 34C, 34D Gate driving integrated circuit chip 36A, 36B, 36C, 36D , Source drive integrated circuit chip 34E, 36F, 36G, 36H 38 Signal processing circuit 40 Time controller 50 Liquid crystal display device 52 Liquid crystal display panel 1227347

Page 15

Claims (1)

1227347 VI. Scope of patent application 1. A liquid crystal display device, comprising: a liquid crystal display panel; a plurality of first driver IC chips; and a timing controller A controller) is electrically connected to each of the first driving integrated circuit chips, and is used to output a corresponding initial pulse (startpu 1 se) to each of the first driving integrated circuit chips according to a timing. 2. For example, the liquid crystal display device of the first patent application scope, wherein the liquid crystal display device further includes a plurality of scanning lines and a plurality of signal lines (s i g n a 1 1 i n e) are respectively disposed on the liquid crystal display panel. 3. For the liquid crystal display device in the second item of the patent application, wherein each of the first driving integrated circuit chips is serially connected to at least one second driving integrated circuit chip. 4. For the liquid crystal display device in the third item of the patent application, wherein each of the first and second driving integrated circuit chips is a gate driving integrated circuit chip. 5. For the liquid crystal display device under the scope of patent application, the gate drive integrated circuit chips are all located on at least one tape carrier package (TCP), and the gate drive Integrated circuit crystal Page 16 1227347 VI. Scope of patent application The film system uses the tape-and-reel package to be electrically connected to the corresponding scanning lines. 6. For the liquid crystal display device in the fourth item of the patent application, wherein each of the gate driving integrated circuit chips is used to output a switch / address signal to each of the scanning lines. 7. For the liquid crystal display device of the third item of the patent application, wherein each of the first and second driving integrated circuit chips is a source driving integrated circuit chip. 8. For the liquid crystal display device under the scope of patent application item 7, wherein the source driver integrated circuit chips are all arranged on at least one tape carrier package (TCP), and the source drivers The integrated circuit chips are each electrically connected to the corresponding signal lines by using the tape and reel package. 9. The liquid crystal display device according to item 7 of the patent application, wherein each of the source driver integrated circuit chips is used to output an image data signal to each of the signal lines. Page 17