JP2000322017A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device reducing an operation interruption affecting other devices generated by electromagnetic wave radiation caused by a start signal. SOLUTION: A clock signal 21 generated from a drive signal generating circuit 9 is inputted to a source driver 2. A first clock signal 21 of the clock signal 21 is synchronized with a first point of image data 23. When a start signal generating circuit 4 detects the first clock signal, the start signal generating circuit 4 generates a start signal 22 to take in the image data 23. The start signal 22 is sent to a shift register circuit 5 to shift based on the clock signal 21 and to take in the image data 23 into a latch circuit 6 sequentially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a display device such as a liquid crystal display device for displaying an image by driving pixels formed of liquid crystal sandwiched between substrates.

[0002]

2. Description of the Related Art In recent years, computer systems in the fields of OA and industrial automatic machines, and display devices such as audio-visual equipment represented by television receivers and video cameras have been used.
A liquid crystal display panel is constructed by sandwiching liquid crystal between glass substrates, and a plurality of pixels formed in a matrix by the liquid crystal sandwiched on the liquid crystal display panel are driven by electric signals to form an image on the liquid crystal display panel. 2. Description of the Related Art A liquid crystal display device for displaying has been widely used because of its features such as light weight, low power consumption, and space saving.

In such a conventional liquid crystal display device, generally, a driving signal for driving a pixel on a liquid crystal display panel is supplied by a source driver to an image data signal, a clock signal, a start signal, and a start signal applied from outside. The pixel is generated based on the signal, and the driving signal is applied to the liquid crystal display panel to drive and control the pixel, thereby displaying an image on the liquid crystal display panel.

The above-mentioned liquid crystal display device will be described below as an example of a conventional display device with reference to the drawings. FIG. 3 is a block diagram showing a schematic configuration of a liquid crystal display device as an example of a conventional display device, and FIG. 4 is a timing chart for explaining the operation of the liquid crystal display device shown in FIG.

In FIG. 3, reference numeral 30 denotes a liquid crystal display panel in which a plurality of pixels 38 are formed in a matrix by liquid crystal sandwiched between glass substrates, and 31 denotes a driving signal based on image data to pixels 38 on the liquid crystal display panel 30. A source driver 32 is applied through the signal line S31. The source driver 32 scans the pixels 38 on the liquid crystal display panel 30 based on the horizontal synchronizing signal.
A gate driver for line-sequential scanning through 2; 33, a shift register circuit for shifting and holding a start signal based on a clock signal; and 34, for latching image data based on a start signal transferred from the shift register circuit 33. A latch circuit 35, and a latch circuit 34
LCD panel 3 based on the image data latched by
A drive voltage generating circuit for supplying a drive signal voltage to 0, a liquid crystal display module 36 comprising a liquid crystal display panel 30, a source driver 31 and a gate driver 32, and a supply 37 for driving the liquid crystal display module 36 from outside thereof It is a drive signal generation circuit that generates various signals.

In FIG. 4, reference numeral 40 denotes a horizontal synchronizing signal;
Is a clock signal, 42 is a start signal, and 43 is an image data signal. In the above-described liquid crystal display device, the clock signal 41 and the start signal 42 generated by the drive signal generation circuit 37 are sent to the shift register circuit 33 provided in the source driver 31 in the liquid crystal display module 36, In the circuit 33, the start signal 42 shifts based on the clock signal 41, and the image data 43 from the drive signal generation circuit 37 is sequentially taken into the latch circuit 34 every time the start signal 42 shifts.

Then, a driving signal of a voltage corresponding to the image data 43 taken into the latch circuit 34 is generated by a driving voltage generating circuit 35 in the source driver 31, and a driving signal based on the image data 43 is transmitted to the liquid crystal display panel 30.
Of the liquid crystal display panel 30 based on the horizontal synchronization signal 40 from the drive signal generation circuit 37 by the gate driver 32 in the liquid crystal display module 36. Line S31
By controlling the driving of the pixels 38 on the liquid crystal display panel 30 through the scanning lines S32, the liquid crystal display panel 30
Display the image above.

[0008]

However, in a conventional display device such as the liquid crystal display device described above, a start signal 42 is supplied from a drive signal generation circuit 37 outside the liquid crystal display module 36 to the inside of the liquid crystal display module 36. Is configured to be added to the source driver 31 of
The start signal 42 is a signal having the second highest frequency next to the clock signal 41, and an electromagnetic wave is radiated from the transmission path of the start signal 42 from the drive signal generation circuit 37 to the liquid crystal display module 36 by transmitting the start signal 42.

There is a problem in that the electromagnetic wave radiation from the transmission path of the start signal 42 may interfere with the operation of other devices depending on the use condition. The present invention solves the above-mentioned conventional problems, and can eliminate operation disturbance to other devices due to electromagnetic wave radiation from a transmission path of a start signal, which has existed conventionally, and can be generated by electromagnetic wave radiation by a start signal. Provided is a display device capable of greatly reducing operation disturbance to other devices.

[0010]

In order to solve the above-mentioned problems, a display device according to the present invention generates a start signal in a signal driver so that a start from a signal driver outside a conventional signal driver to a signal driver can be performed. It is characterized in that the signal transmission path is omitted to eliminate electromagnetic wave radiation from the transmission path that has conventionally occurred.

As described above, it is possible to eliminate the interference with the other devices due to the electromagnetic wave radiation from the transmission path of the start signal, which has conventionally existed, and to operate the other devices due to the electromagnetic wave radiation due to the start signal. Interference can be greatly reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device according to a first aspect of the present invention includes a display panel in which a plurality of pixels are arranged in a matrix, and a driving device which applies the display panel based on image data of a video signal. A signal driver that generates a signal, and a scan driver that scans the display panel line-sequentially based on a horizontal synchronization signal of the video signal, wherein the drive driver applies the drive signal from the signal driver and outputs a signal from the scan driver. A display device for driving the pixels by the line-sequential scanning to display an image, wherein the signal driver generates the signal at a timing of the horizontal synchronization signal based on a clock signal for generating a reference timing of the image display. The start of the sampling of the image data is controlled by the start signal, and the image data sampled at the sampling timing is controlled. Configured to generate the drive signal from the.

According to this configuration, the start signal is generated in the signal driver, so that the transmission path of the start signal from the outside of the signal driver to the signal driver as in the related art is omitted, and the transmission path that is conventionally generated is eliminated. Eliminates electromagnetic radiation from Hereinafter, a liquid crystal display device which is an example of a display device according to an embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal display device as an example of the display device of the present embodiment, and FIG. 2 is a timing chart for explaining the operation of the liquid crystal display device shown in FIG. It is. In FIG. 1, reference numeral 1 denotes a liquid crystal display panel in which a plurality of pixels 10 are formed in a matrix by liquid crystal sandwiched between glass substrates, and 2 denotes a drive signal based on image data to the pixels 10 on the liquid crystal display panel 1 through a signal line S1. A gate driver that scans the pixels 10 on the liquid crystal display panel 1 line-sequentially through a scanning line S2 based on a horizontal synchronization signal 20;
Is a start signal generation circuit that detects the first clock signal 21 input to the source driver 2 and generates a start signal 22, and 5 transfers the start signal 22 while shifting and holding the start signal 22 based on the clock signal 21. A shift register circuit, 6 is a latch circuit for latching image data 23 based on a start signal 22 transferred from the shift register circuit 5, and 7 is driven to the liquid crystal display panel 1 based on the image data 23 latched by the latch circuit 6. A driving voltage generating circuit for supplying a signal voltage, 8 is a liquid crystal display module including a liquid crystal display panel 1, a source driver 2 and a gate driver 3, and 9 is a signal for driving the liquid crystal display module 8 from outside thereof. This is a driving signal generating circuit that generates the signal.

In FIG. 2, reference numeral 20 denotes a horizontal synchronization signal;
Is a clock signal, 22 is a start signal, and 23 is an image data signal. In the above liquid crystal display device, the clock signal 21 generated by the drive signal generation circuit 9 is input to the source driver 2 in the liquid crystal display module 8. Of the clock signals 21 input to the source driver 2,
The first clock signal from the rising timing of the horizontal synchronization signal 20 is synchronized with the start point of the image data 23, and when the start signal generation circuit 4 detects the first clock signal 21, the start signal generation circuit 4 Generates a start signal 22 which is a timing to start capturing the image data 23.

The start signal 22 output from the start signal generation circuit 4 in this manner is
Are sent to the shift register circuit 5 together with the clock signal 21 generated in the first and second clock signals, counting from the rising timing of the horizontal synchronizing signal 20 in the shift register circuit 5.
The output of the shift register circuit 5 is shifted while being synchronized with the timing of the clock signal 21 such as the first and third clock signals 21. Each time the start signal 22 is shifted, the latch circuit 6 The image data 23 is sequentially taken in.

Then, a driving signal of a voltage corresponding to the image data 23 taken into the latch circuit 6 is generated by a driving voltage generating circuit 7 in the source driver 2 and a driving signal based on the image data 23 is generated. Of the liquid crystal display panel 1 based on the horizontal synchronization signal 20 from the drive signal generation circuit 9 by the gate driver 3 in the liquid crystal display module 8.
Is scanned and the pixels 10 for one horizontal scan on the liquid crystal display panel 1 are driven and controlled through the signal line S1 and the scan line S2, thereby displaying an image for one horizontal scan on the liquid crystal display panel 1. I do.

After the image data 23 for one horizontal scan is fetched into the latch circuit 6 as described above, when the horizontal synchronizing signal 20 becomes LOW, the start signal generating circuit 4 is reset, and the next horizontal synchronizing signal 20 is reset. Waiting for the input of the first clock signal after the start of horizontal scanning by the signal 20, and thereafter, similarly, from the image data 23 for two horizontal scans to the image data 23 for a predetermined horizontal scan (corresponding to the number of scan lines S2). Are sequentially taken into the latch circuit 6, and an image for one screen is displayed on the liquid crystal display panel 1 based on the image data 23.

As described above, the start signal 22 is generated by the start signal generation circuit 4 in the source driver 2 in the liquid crystal display module 8 so that the start signal is transmitted between the drive signal generation circuit 9 and the liquid crystal display module 8. It is possible to eliminate the need to provide a transmission path for transmission. As a result, it is possible to eliminate the interference with other devices caused by electromagnetic wave radiation from the transmission path of the start signal, which has existed in the past, and to significantly reduce the interference with other devices caused by electromagnetic wave radiation due to the start signal. Can be reduced.

In this embodiment, the start signal 2
2 is generated in the source driver 2, the horizontal synchronizing signal 20 is used as a reset signal. However, since the horizontal synchronizing signal 20 has a considerably lower frequency than the start signal 22, interference can be reduced. Further, although the liquid crystal display device has been described as an embodiment of the present invention by way of example, the present invention can be similarly applied to other types of display devices, for example, display devices such as a plasma display and an LED panel display.

In the embodiment of the present invention, the start signal 22 is generated by the first clock signal 21. However, if the image signal 23 is synchronized with the start signal 22, the start signal 22 is generated. The signal 22 may be generated.

[0022]

As described above, according to the present invention, the start signal is generated in the signal driver, thereby eliminating the conventional transmission path of the start signal from outside the signal driver to the signal driver, Electromagnetic radiation from the transmission path, which has conventionally occurred, can be eliminated.

Therefore, it is possible to eliminate the interference with the other devices caused by the electromagnetic wave radiation from the transmission path of the start signal, which has conventionally existed, and to prevent the interference with the other devices caused by the electromagnetic wave radiation due to the start signal. Can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a liquid crystal display device which is an example of a display device according to an embodiment of the present invention.

FIG. 2 is a timing chart illustrating operation of a liquid crystal display device which is an example of the embodiment.

FIG. 3 is a block diagram illustrating a schematic configuration of a liquid crystal display device which is an example of a conventional display device.

FIG. 4 is a timing chart for explaining the operation of the liquid crystal display device as an example of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Source driver 3 Gate driver 4 Start signal generation circuit 5 Shift register circuit 6 Latch circuit 7 Drive voltage generation circuit 8 Liquid crystal display module 9 Drive signal generation circuit 10 Pixel

Claims (1)

[Claims] 1. A display panel in which a plurality of pixels are arranged in a matrix, a signal driver for generating a drive signal to be applied to the display panel based on image data of a video signal, and a horizontal synchronization signal for the video signal And a scan driver that scans the display panel line-sequentially based on the image data. The pixel is driven and an image is displayed by the application of the drive signal from the signal driver and the line-sequential scan from the scan driver. A display device, wherein the signal driver controls a start of sampling of the image data by a start signal generated at a timing of the horizontal synchronization signal based on a clock signal for generating a reference timing of the image display, A display configured to generate the drive signal from image data sampled at the sampling timing apparatus.