TWI699752B - Display driver, display panel and information processing device - Google Patents

Abstract

A display driver for driving a TFT display device. The TFT display device has a substrate and a line scanning circuit, a source channel switch circuit and a TFT display structure are integrated on the substrate, and the display driver is characterized by: The display driver has a multiplexer, wherein the multiplexer has a plurality of input terminals, a control port and at least one output terminal, and the plurality of input terminals are used to communicate with n gate scanning clock signals and one frame A start pulse signal, a light-emitting start pulse signal and L switch signals are coupled, n and L are all positive integers, the control port is used to couple with at least one selection signal, and the at least one output terminal is used to At least one output signal is provided and connected to a plurality of wires on the substrate, and the plurality of wires are connected to the row scanning circuit or the source channel switch circuit.

Description

Display driver, display panel and information processing device

The present invention relates to a display driver, particularly to a display driver for driving a display device with GOA.

GOA (gate driver on array; on-board gate driver circuit) is a driver circuit integrated on a substrate of a display device. Generally, a row scanning circuit and a source channel switching circuit are provided. Among them, the row scanning circuit is Used to drive the gates of each row of TFTs (thin film transistors) of a TFT display panel according to a working sequence to turn on each row of TFTs; and the source channel switch circuit is used to match the working sequence to pass source data through The conductive TFTs of each row are transmitted to each pixel unit of the TFT display panel.

In addition, a display driver is connected to the GOA integrated on the substrate through a plurality of scanning control signal lines to drive the TFT display panel to display a picture. However, when the number of the scan control signal lines is large, the wiring space of the row scan circuit and the source channel switch circuit on the substrate may be insufficient.

In order to solve the above-mentioned problems, there is a conventional technical solution in which a line scan control signal multiplexer and a plurality of source channel control signal multiplexers are arranged in a display driver to reduce output pins. Please refer to FIG. 1, which is a schematic circuit diagram of a multiplexed pin scheme of a conventional display driver 10 for driving a TFT display device 20. As shown in FIG. 1, the display driver 10 has a first multiplexer 11 and 12 second multiplexers 12, and the TFT display device 20 has a row scanning circuit 21 and a source channel switch circuit 22 formed on a substrate. And a TFT display structure 23, wherein the first multiplexer 11 has a plurality of first input terminals, a first control port, and a first output terminal, and the plurality of first input terminals are used to interact with n gates Polar scanning clock signals GCK ₁ -GCK _n , a frame start pulse signal STV and a light start pulse signal STE are coupled, n is a positive integer, and the first control port is used to interact with at least one first selection signal SEL( 1) Coupled, the first output terminal is used to provide a first output signal CGOUT, and the first multiplexer 11 is controlled by the at least one first selection signal SEL(1) to select the plurality of One of the first input terminals is electrically connected to the first output terminal; and each second multiplexer 12 has m second input terminals, a second control port, and a second output terminal, where m is A positive integer greater than 1, the m second input terminals are used to couple to m switch signals (eg SW ₁ -SW _m ), and the second control port is used to communicate with at least one second selection signal SEL( j) coupling, j is an integer between 2 and 13, the second output terminal is used to provide a second output signal MUX(k), k is an integer between 1 and 12, and each The two multiplexers 12 both select one of the plurality of second input terminals to be electrically connected to the second output terminal under the control of the at least one second selection signal SEL(j). During operation, the row scanning circuit 21 in the TFT display device 20 performs a first demultiplexing operation on the first output signal CGOUT to drive the TFT display structure 23 row by row, and the source channel switch circuit in the TFT display device 20 22 performs a second demultiplexing operation on the second output signals MUX(1)-MUX(12) to sequentially turn on the source data channels of each pixel, so that the display screen of the TFT display device 20 presents a picture.

However, when the display screen requires high resolution, the number of second output signals MUX(k) of the display driver 10 will increase, and if the area of the substrate must be limited to a small range (such as the display of a smart watch) In the screen), the first output signal CGOUT connected to the row scanning circuit 21 is very likely to cross the second output signal MUX(k) connected to the source channel switch circuit 22, so that the signal routing on the substrate cannot carry out.

In order to solve the above problems, a novel scanning driving method of the display screen is urgently needed in the art.

One purpose of the present invention is to disclose a display driver that can carry two different attributes of the line scan control signal and the source channel control signal through the output of a multiplexer, so as to improve the GOA circuit on a display substrate The layout of components and the degree of freedom of signal routing can adapt to the requirements of display panels of different display specifications.

Another object of the present invention is to disclose a display driver that can output signals with two different attributes, such as a horizontal scan control signal and a source channel control signal, in a time-sharing manner through multiple output terminals of a multiplexer, so as to improve one In the case of the component layout of the GOA circuit on the display substrate and the degree of freedom of signal routing, it meets the requirements of the display data transmission bandwidth of a display panel.

To achieve the above objective, a display driver is proposed, which is used to drive a TFT display device having a substrate and integrating a row scanning circuit, a source channel switching circuit and a TFT display on the substrate Structure, and the display driver is characterized by:

The display driver has a multiplexer, wherein the multiplexer has a plurality of input terminals, a control port and at least one output terminal, and the plurality of input terminals are used to communicate with n gate scanning clock signals and one frame The start pulse signal, a light-emitting start pulse signal and L switch signals are coupled, n and L are all positive integers, the control port is used for coupling with at least one selection signal, and the at least one output terminal is used for Provide at least one output signal and connect it to a plurality of traces on the substrate, the plurality of traces are connected to the row scanning circuit or the source channel switch circuit, and the multiplexer is selected according to the at least one The signal control selects an input terminal of the plurality of input terminals to be electrically connected to the output terminal.

In one embodiment, the TFT display structure is a liquid crystal display structure.

In one embodiment, the TFT display structure is an organic light emitting diode display structure.

To achieve the above objective, the present invention further discloses a display panel, which has a TFT display device and a display driver for driving the TFT display device. The TFT display device has a substrate and a row scanning circuit integrated on the substrate. A source channel switch circuit and a TFT display structure, and the display driver is characterized by:

The display driver has a multiplexer, wherein the multiplexer has a plurality of input terminals, a control port and at least one output terminal, and the plurality of input terminals are used to communicate with n gate scanning clock signals and one frame The start pulse signal, a light-emitting start pulse signal and L switch signals are coupled, n and L are all positive integers, the control port is used for coupling with at least one selection signal, and the at least one output terminal is used for Provide at least one output signal and connect it to a plurality of traces on the substrate, the plurality of traces are connected to the row scanning circuit or the source channel switch circuit, and the multiplexer is selected according to the at least one The signal control selects an input terminal of the plurality of input terminals to be electrically connected to the output terminal.

In possible embodiments, the display panel may be a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display, a light emitting diode display panel, an organic light emitting diode display panel, a quantum dot light emitting diode Display panel, Mirco-LED display panel or Mini-LED display panel.

In addition, the present invention further discloses an information processing device having a central processing unit and the aforementioned display panel, wherein the central processing unit is used to communicate with the display driver.

In one embodiment, the information processing device is a smart phone.

In one embodiment, the information processing device is a portable computer.

In order to enable your reviewer to further understand the structure, features and purpose of the present invention, drawings and detailed descriptions of preferred specific embodiments are attached as follows.

In order to solve the problem of insufficient signal wiring space on the substrate of the display device, the present invention integrates multiple line scan control signals and multiple source channel control signals in a display driver into a multiplexer to further reduce the display The output pin of the driver. That is to say, by using the output signal of a multiplexer to time-sharing two signals with different attributes, such as the horizontal scanning control signal and the source channel control signal, the output signal can be connected to the horizontal scanning control in the GOA without limitation. Circuit or source channel control circuit.

Please refer to FIG. 2, which is a schematic circuit diagram of a multiplexed pin embodiment of a display driver 100 for driving a TFT display device 200 of the present invention. As shown in FIG. 2, the display driver 100 has a multiplexer 110, and the TFT display device 200 has a row scanning circuit 210, a source channel switch circuit 220, and a TFT display structure 230 formed on a substrate. The device 110 has a plurality of input terminals, a control port and at least one output terminal, and the plurality of input terminals are used to communicate with n gate scan clock signals GCK ₁ -GCK _n , a frame start pulse signal STV, and a light emitting The start pulse signal STE and the L switch signals SW ₁ -SW _{L are} coupled, n and L are both positive integers, the control port is used for coupling with at least one selection signal SEL, and the at least one output terminal is used for At least one output signal VSR is provided and connected to a plurality of traces on the substrate. The plurality of traces are connected to the row scanning circuit 210 or the source channel switch circuit 220, and the multiplexer 110 is based on the at least one The control of the selection signal SEL selects an input terminal of the plurality of input terminals to be electrically connected to the output terminal.

During operation, the row scanning circuit 210 in the TFT display device 200 can drive the TFT display structure 230 row by row by performing a first demultiplexing operation on at least one output signal VSR, and the source channel in the TFT display device 200 The switch circuit 220 can also perform a second demultiplexing operation on the at least one output signal VSR to sequentially turn on the source data channels of each pixel, so that the display screen of the TFT display device 200 presents a picture.

Accordingly, when the display screen requires high resolution and the area of the substrate must be limited to a small range (such as the display screen of a smart watch), at least one output signal VSR of the display driver 100 can be connected to the horizontal scanning circuit 210 can also be connected to the source channel switch circuit 220, so the layout of the components on the substrate of the TFT display device 200 and the freedom of signal routing can be greatly improved. In addition, the number of output signals VSR can be adjusted according to the data transmission bandwidth requirements of the display: when the display requires a larger data transmission bandwidth, more output signals VSR can be set; and when the display does not require a large When data transmission bandwidth, less output signal VSR can be set.

Based on the above principle description, the present invention further provides a display panel. Please refer to FIG. 3, which shows a block diagram of an embodiment of the display panel of the present invention. As shown in FIG. 3, a display panel 300 has the aforementioned display driver 100 and TFT display device 200. The display panel may be, for example, but not limited to, a cathode ray tube (CRT) display panel, a digital light processing (digital light processing; DLP) display panel, a liquid crystal display (LCD), a light emitting diode ( light emitting diode (LED) display panel, organic light emitting diode (OLED) display panel, quantum dot light emitting diode (QLED) display panel, Mirco-LED display panel or Mini -LED display panel.

Based on the above principle description, the present invention further provides an information processing device. Please refer to FIG. 4, which shows a block diagram of an embodiment of the information processing device of the present invention. As shown in FIG. 4, an information processing device 400 has a central processing unit 410 and the aforementioned display panel 300, wherein the central processing unit 410 is used to communicate with the display driver 100.

With the design disclosed above, the present invention has the following advantages:

1. The display driver of the present invention can carry two different attribute signals, such as line scan control signal and source channel control signal, through the output of a multiplexer, so as to improve the component layout and signal of the GOA circuit on a display substrate. The degree of freedom of wiring can adapt to the requirements of display panels of different display specifications.

2. The display driver of the present invention can output signals with two different attributes, such as a line scan control signal and a source channel control signal, in a time-sharing manner through multiple output terminals of a multiplexer, so as to improve the GOA circuit on a display substrate In the case of the component layout and the degree of freedom of signal routing, it meets the requirement of the display data transmission bandwidth of a display panel.

The disclosure in this case is a preferred embodiment, and any partial changes or modifications that are derived from the technical ideas of the case and can be easily inferred by those familiar with the art will not deviate from the scope of the patent right of the case.

In summary, regardless of the purpose, means and effect of this case, it is shown that it is very different from the conventional technology, and its first invention is suitable for practicality, and it does meet the patent requirements of the invention. I sincerely ask the examiner to check it out and grant the patent as soon as possible. Society is for the best prayer.

10: Display driver 11: The first multiplexer 12: Second multiplexer 20: TFT display device 21: Line scanning circuit 22: Source channel switch circuit 23: TFT display structure 100: display driver 110: Multiplexer 200: TFT display device 210: Line scanning circuit 220: source channel switch circuit 230: TFT display structure 300: display panel 400: Information processing device 410: Central Processing Unit

FIG. 1 is a schematic circuit diagram of a multiplex pin scheme of a conventional display driver for driving a TFT display device. 2 is a schematic circuit diagram of an embodiment of a multiplexed pin of a display driver for driving a TFT display device according to the present invention. FIG. 3 shows a block diagram of an embodiment of the display panel of the present invention. FIG. 4 shows a block diagram of an embodiment of the information processing device of the present invention.

100: display driver

110: Multiplexer

200: TFT display device

210: Line scanning circuit

220: source channel switch circuit

230: TFT display structure

Claims (6)

A display driver for driving a TFT display device. The TFT display device has a substrate and integrates a row scanning circuit, a source channel switching circuit and a TFT display structure on the substrate, and the display driver is characterized by: The display driver has a multiplexer, wherein the multiplexer has a plurality of input terminals, a control port and at least one output terminal, and the plurality of input terminals are used to communicate with n gate scanning clock signals and one frame The start pulse signal, a light-emitting start pulse signal and L switch signals are coupled, n and L are all positive integers, the control port is used for coupling with at least one selection signal, and the at least one output terminal is used for Provide at least one output signal and connect it to a plurality of traces on the substrate, the plurality of traces are connected to the row scanning circuit or the source channel switch circuit, and the multiplexer is selected according to the at least one The signal control selects an input terminal of the plurality of input terminals to be electrically connected to the output terminal. The display driver according to claim 1, wherein the TFT display structure is a liquid crystal display structure or an organic light emitting diode display structure. A display panel has a TFT display device and a display driver for driving the TFT display device. The TFT display device has a substrate and a line scanning circuit, a source channel switch circuit and a TFT display are integrated on the substrate Structure, and the display driver is characterized by: The display driver has a multiplexer, wherein the multiplexer has a plurality of input terminals, a control port and at least one output terminal, and the plurality of input terminals are used for n gate scan clock signals, a frame start pulse signal, a light start pulse signal, and L switch signals are coupled, n and L are all positive integers, and the control port is used to couple with at least one selection signal The at least one output terminal is used to provide at least one output signal and is connected to a plurality of traces on the substrate, and the plurality of traces are connected to the row scanning circuit or the source channel switch circuit, and the The multiplexer selects one of the plurality of input terminals to be electrically connected to the output terminal according to the control of the at least one selection signal. The display panel according to claim 3, which is displayed by a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display, a light emitting diode display panel, an organic light emitting diode display panel, and a quantum dot light emitting diode display A display panel selected by the group consisting of the panel, Mirco-LED display panel and Mini-LED display panel. An information processing device has a central processing unit and the display panel according to any one of claims 3 to 4, wherein the central processing unit is used to communicate with the display driver. The information processing device described in claim 5 is a smart phone or a portable computer.

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