CN1294552C - Liquid crystal display and method thereof - Google Patents

Abstract

A liquid crystal display and method thereof, the liquid crystal display comprises a timing controller, a plurality of serially connected driving chips and a display panel. The timing controller is used to output pixel signals. The driving chip is used to drive the display panel to display images. The driving chip comprises a differential receiver, a single-ended receiver, a shift register, a differential output device, a single-ended output device and a pixel driver. The driving chip receives the pixel signal, drives the display panel after internal processing, and then transmits the pixel signal to the next driving chip.

Description

Liquid crystal display and method thereof

technical field

The invention relates to a liquid crystal display, and in particular to a liquid crystal display with dual transmission modes and a driving chip thereof.

Background technique

Please refer to FIG. 1 , which shows a conventional liquid crystal display. The liquid crystal display 100 includes a timing controller (Timing controller) 102 , n driver ICs (Driver IC) 104 connected in series, a display panel 108 , a printed circuit board 106 and a glass substrate 110 . The timing controller 102 disposed on the printed circuit board 106 is used to output pixel signals in a single-ended format. The first driver chip 104 ( 1 ) is electrically connected to the timing controller 102 . The driver chips 104(1), 104(2), 104(3)...104(n) are connected in series. After the driver chip 104(1) receives the pixel signal output by the timing controller 102, it transmits the pixel data to the driver chip 104(2); the driver chip 104(2) transmits the pixel signal to the next driver chip 104( 3), and so on to transmit the pixel signal to the last driver chip 104(n). Each driving chip 104 drives the display panel 108 with the captured pixel signal. Each driver chip 104 is placed on the glass substrate 110, and this method of transmitting data on the glass substrate is called WOA (Wire on glass).

Please refer to FIG. 2 , which shows a schematic diagram of a conventional driver chip. Data is transmitted between the driving chips 104 in a single-ended form of pixel signals. The driver chip 104 includes a single-ended receiver 111 , a single-ended output 112 , a shift register 113 and a pixel driver 114 . The single-ended receiver 111 and the single-ended output device 112 are, for example, CMOS TTL circuits. After receiving the pixel data, the single-end receiver 111 transmits the pixel data to the shift register 113 and then to the single-end outputter 112 to output to the next driver chip. The pixel driver 114 retrieves the data corresponding to the driving chip from the shift register 113 and drives the display panel 108 accordingly.

However, when the pixel signal is transmitted through the glass substrate wires between the driver chips in a single-ended form, the pixel signal will be severely attenuated due to the high impedance of the wire. Moreover, for a high-definition liquid crystal display, more driver chips are required, and the signal attenuation is more serious at the end, which causes difficulties in applying to a high-definition LCD screen.

Contents of the invention

In view of this, the object of the present invention is to provide a liquid crystal display and its driving chip, so that the pixel signal will not be severely attenuated during transmission and the transmission clock can be increased.

According to the object of the present invention, a liquid crystal display is proposed. The liquid crystal display includes a timing controller, a plurality of driver chips connected in series and a display panel. The timing controller outputs the pixel signal to the first driver chip among the driver chips, the first driver chip receives the pixel signal according to the preset receiving mode, and then transmits the pixel signal to the second driver chip according to the preset output mode, By analogy, the pixel signal is transmitted to the last driver chip. And each driving chip drives the display panel with the sampled pixel signal.

According to another object of the present invention, a data transmission method for a liquid crystal display is provided, and the liquid crystal display includes a timing controller, a first driver chip and a second driver chip connected in series. First, the pixel signal is output by the timing controller. Then the first driving chip receives the pixel signal according to the preset receiving mode, and extracts the pixel signal. Then, the first driver chip outputs the pixel signal to the second driver chip according to a preset output mode.

In order to make the above-mentioned purpose, features, and advantages of the present invention more comprehensible, a preferred embodiment will be described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1 shows a schematic diagram of a conventional liquid crystal display.

Figure 2 shows the schematic diagram of a traditional driver chip.

FIG. 3 shows a schematic diagram of a liquid crystal display driving circuit according to a preferred embodiment of the present invention.

Fig. 4 shows a schematic diagram of a driver chip according to a preferred embodiment of the present invention.

Description of reference symbols

100: Schematic diagram of traditional LCD drive circuit

102, 302: timing controller

106, 306: printed circuit board

104: Traditional driver chip

108, 308: display panel

110, 310: glass substrate

300: Schematic diagram of a liquid crystal display driving circuit according to a preferred embodiment of the present invention

304: A driver chip according to a preferred embodiment of the present invention

402: input selector

404: Differential Receiver

406, 111: single-ended receiver

408, 113: shift register

410: Differential output device

412, 112: single-ended follower

414: output selector

416, 114: pixel driver

Detailed ways

Please refer to FIG. 3 , which shows a schematic diagram of a liquid crystal display driving circuit according to a preferred embodiment of the present invention. The liquid crystal display 300 includes a timing controller (Timing controller) 302 , n driver ICs (Driver IC) 304 connected in series, a display panel 308 , a printed circuit board 306 and a glass substrate 310 . The timing controller 302 disposed on the printed circuit board 306 outputs, for example, pixel signals in a differential form. The first driver chip 304 ( 1 ) is electrically connected to the timing controller 302 . The driver chips 304(1), 304(2), 304(3)...304(n) are connected in series. The driving chip 304(1) on the glass substrate 310 receives the pixel signal output by the timing controller 302, and then transmits the pixel signal to the next driving chip 304(2), and the driving chip 304(2) transmits the pixel signal to the next The driver chip 304(3), and so on, transmits the pixel signal to the last driver chip 304(n). The driving chips 304 transmit pixel signals in a differential form, or transmit pixel signals in a single-ended and differential form alternately. Each driving chip 304 drives the display panel 308 by the captured pixel signal. The glass substrate 310 is a base for driving the chip 304, and this method of transmitting data on the glass substrate is called WOA (Wire on glass).

Please refer to FIG. 4 , which shows a schematic diagram of a driver chip according to a preferred embodiment of the present invention. Each driver chip 304 includes an input selector 402 , a differential receiver 404 , a single-ended receiver 406 , a shift register 408 , a differential output 410 , a single-ended output 412 , an output selector 414 and a pixel driver 416 .

The driver chip 304 has a preset receiving mode and a preset output mode, wherein the preset receiving mode can be further divided into differential (Differential) or single-ended (Single-ended), and the default output mode can also be divided into differential Dynamic or single-ended. The driver chip 304 receives the pixel signal according to its preset receiving mode, and outputs the pixel signal according to its preset output mode. The input selector 402 is used to receive the pixel signal and output it: when the preset receiving mode of the input selector 402 is differential, the differential receiver 404 is enabled to receive the pixel signal, and the differential receiver 404 then converted into an internal signal output, and the form of the internal signal is converted into a single-ended form in this embodiment; when the preset receiving mode is single-ended, the input selector 402 enables the single-ended receiver 406 to receive its The pixel signal is then converted by the single-ended receiver 406 into an internal signal for output. In this embodiment, the internal signal is still in a single-ended form.

The shift register 408 is used to receive the internal signal output by the differential receiver 404 or the single-ended receiver 406 , and output it after temporary storage. The differential output device 410 is used to receive the internal signal output by the shift register 408, and convert it to output a pixel signal in a differential form; the single-ended output device 412 is used to receive the internal signal output by the shift register 408. Outputs the pixel signal in single-ended form.

The output selector 414 selects and outputs the pixel signal output by the differential output unit 410 or the single-ended output unit 412 according to a preset output mode. When the preset output mode is differential, the output selector 414 outputs the pixel signal output by the differential output device 410; when the preset output mode is single-ended, the output selector 414 outputs the output of the single-ended output device 412 pixel signal. The pixel driver 416 retrieves the data corresponding to the driver chip from the shift register 408 and drives the display panel 308 accordingly.

The liquid crystal display disclosed in the above-mentioned embodiments of the present invention is illustrated by a driver chip having both differential and single-ended I/O modes. However, the driver chip can also only have a differential I/O mode, which will not be repeated here.

Although the liquid crystal display of this embodiment adopts the transmission mode of WOA, the pixel signals in the differential form can be used for transmission between the driving chips, so that the pixel signals will not be seriously attenuated. Alternate transmission of single-ended and differential pixel signals can also be adopted between drive chips, which can simultaneously have the advantages of power saving of single-ended signals and good signal quality of differential signals. And because of the use of differential signal transmission, it can be easily applied to high-definition liquid crystal displays.

In summary, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Anyone skilled in this art can make various modifications without departing from the spirit and scope of the present invention. Changes and modifications, so the scope of protection of the present invention should be defined by the scope of the appended patent application.

Claims (12)

1. LCD comprises:

Time schedule controller is in order to export one first picture element signal; And

One first chip for driving and one second chip for driving, this first chip for driving are to electrically connect with this time schedule controller, and this second chip for driving is to electrically connect with this first chip for driving;

Wherein, this first chip for driving and this second chip for driving all have a default receiving mode and a default output mode, and this default receiving mode is to divide into differential type or monofocal, and this first default output mode is to divide into differential type or monofocal;

Wherein, this first chip for driving received this first picture element signal according to presetting receiving mode, and according to exporting one second picture element signal by default output mode;

Wherein, this second chip for driving received this second picture element signal according to presetting receiving mode, and according to exporting one the 3rd picture element signal by default output mode.

2. display as claimed in claim 1, wherein, this first chip for driving comprises:

One differential receiver;

One single-ended receiver;

One shift register, its input end electrically connects with the single-ended receiver of this differential receiver and this respectively, in order to receive one first internal signal and to keep in the back and export one second internal signal by its output terminal, wherein, when this default receiving mode is during for differential type, this first internal signal is by the output of this differential receiver, and when this receiving mode is during for monofocal, this first internal signal is by this single-ended receiver output;

One differential follower, when this default output mode is during for differential type, this differential follower receives this second internal signal and is converted to this second picture element signal output according to this; And

One single-ended follower, when this default output mode is during for monofocal, this single-ended follower receives this second internal signal and exports this second picture element signal according to this.

3. display as claimed in claim 2, wherein, this first internal signal and second internal signal are to be single-ended format.

4. display as claimed in claim 2, wherein, this first chip for driving has more an input selector, in order to receive this first picture element signal, when this default input pattern is differential type, this input selector is to export this first picture element signal to this differential receiver, and when this default input pattern was monofocal, this input selector was to export this first picture element signal to this single-ended receiver.

5. display as claimed in claim 2, wherein, this first chip for driving has more an outlet selector, when this default output mode is differential type, this outlet selector is this second picture element signal output that this differential follower is produced, when this default output mode was monofocal, this outlet selector was this second picture element signal output that this single-ended follower is produced.

6. display as claimed in claim 2, have more a display panel, this first chip for driving has more a pixel driver, in order to capture this first internal signal or this second internal signal and drive this display panel according to this with display frame from this shift register.

7. display as claimed in claim 1, wherein, this second chip for driving comprises:

One differential receiver;

One single-ended receiver;

One shift register, its input end electrically connects with the single-ended receiver of this differential receiver and this respectively, in order to receive one the 3rd internal signal and to keep in the back and export one the 4th internal signal by its output terminal, wherein, when this default receiving mode is during for differential type, the 3rd internal signal is by the output of this differential receiver, and when this default receiving mode is during for monofocal, the 4th internal signal is by this single-ended receiver output;

One differential follower, when this default output mode is during for differential type, this differential follower receives the 4th internal signal and is converted to the output of the 3rd picture element signal according to this; And

One single-ended follower, when this default output mode is during for monofocal, this single-ended follower receives the 4th internal signal and is converted to the output of the 3rd picture element signal according to this.

8. display as claimed in claim 7, wherein, the 3rd internal signal and the 4th internal signal are to be single-ended format.

9. display as claimed in claim 7, wherein, this second chip for driving has more an input selector, in order to receive this second picture element signal, when this default input pattern is differential type, this input selector is to export this second picture element signal to this differential receiver, and when this default input pattern was monofocal, this input selector was to export this second picture element signal to this single-ended receiver.

10. display as claimed in claim 7, wherein, this second chip for driving has more an outlet selector, when this default output mode is differential type, this outlet selector is the 3rd picture element signal output that this differential follower is produced, when this default output mode was monofocal, this outlet selector was the 3rd picture element signal output that this single-ended follower is produced.

11. display as claimed in claim 7, have more a display panel, this second chip for driving has more a pixel driver, in order to signal in acquisition the 3rd internal signal or the 4th from this shift register, and drives this display panel according to this with display frame.

12. data transmission method that is used for LCD, this LCD comprises one first chip for driving and one second chip for driving of time schedule controller, serial connection, this first chip for driving and this second chip for driving all have a default receiving mode and a default output mode, should default receiving mode be to be differential type or monofocal, should default output mode be to be differential type or monofocal, this first chip for driving is to electrically connect with this time schedule controller, and this method comprises:

Export one first picture element signal by this time schedule controller;

This first chip for driving received and temporary this first picture element signal according to should the presetting receiving mode of this first chip for driving correspondence;

This first chip for driving was exported one second picture element signal to this second chip for driving according to should the presetting output mode of this first chip for driving correspondence;

This second chip for driving received this second picture element signal according to should the presetting receiving mode of this second chip for driving correspondence; And

This second chip for driving was exported one the 3rd picture element signal according to should the presetting output mode of this second chip for driving correspondence.

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