JPH0419786A - liquid crystal display device - Google Patents

Abstract

PURPOSE:To display a mouse and a cursor in a movement period wherein the mouse, cursor, etc., are moved fast by inputting display data to a display memory at intervals of (n) image planes and displaying display data of the same image planes for a period of the (n) image planes. CONSTITUTION:This device is equipped with the display memory 1 stored with display data of one image plane and a write controller which writes sent display data into the display memory 1 at intervals of (n) image planes and further provided with a data controller 2 which switches and sends display data read out of the display memory 1 and successively sent display data to the liquid crystal display device 6 and displays them. Consequently, the same display is made for (n) image planes, so even when the mouse and cursor are moved fast, such a problem that they disappear is eliminated although the movement becomes discontinuous.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a liquid crystal display device used in terminals of video and information equipment.

[Prior Art] A conventional liquid crystal display device has a configuration shown in FIG.
Display data 12 that is continuously sent is displayed in sequence. Therefore, when driving at a frame frequency of 70 Hz, the displayed data is rewritten every 14 m5.

[Problem to be Solved by the Invention 1] The response speed of a liquid crystal display device has a response characteristic as shown in FIG. Even if a lighting voltage is applied to the display pixels of the liquid crystal panel, six lights are actually turned on after a Tr waiting time after the six-light voltage is applied. Further, even if the 6-lamp voltage is switched to the non-lighting voltage, the 6-lamp non-lighting state is reached after the Tf waiting time. Tr and Tf vary depending on the thickness of the liquid crystal layer of the liquid crystal panel, E11 applied voltage, temperature, etc., but at 25°C they are 10100
mS-300 is common.

Conventional liquid crystal display devices rewrite the display screen every 10-odd milliseconds, so when the display screen changes every screen, the response of the liquid crystal cannot follow, and the changing display cannot be seen at all. Specifically, when a mouse or cursor is moved at high speed on a liquid crystal display screen, the mouse or cursor sometimes disappears during the period of movement.

The object of the present invention is to move a mouse, cursor, etc. at high speed. 7] To provide a liquid crystal display device capable of displaying a mouse and a cursor during the period.

[Means for Solving the Problems] The liquid crystal display device of the present invention receives and displays continuously sent display data, and includes a display memory that stores display data for one screen; It has a write control device that writes the sent display data to the display memory every n screens, and switches between the display data read from the display memory and the continuously sent display data and sends it to the liquid crystal display device for display. Pig
It is characterized by being equipped with a control device.

[Example] An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which 6 is a liquid crystal panel, 5 is a signal electrode drive circuit, 4 is a scan electrode drive circuit,
3 is a liquid crystal power supply circuit, l is a display memory, 2 is a data control device, 12 is a display button, and 13 is a drive signal.

The liquid crystal power supply circuit 3 generates six levels of potential necessary for driving the liquid crystal panel from a liquid crystal power supply 11 supplied from the outside, and supplies them to the signal electrode drive circuit and the scan electrode drive circuit. The scan electrode drive circuit 4 drives the scan electrodes of the liquid crystal panel 1 using a scan line start signal YD and a display data latch signal LP. The signal electrode drive circuit 5 takes in the display data sent from the decouple control device 2 into a shift register using the display decoupling transfer lock signal X5CL, takes it into a latch circuit with the LP signal, and drives the signal electrodes of the liquid crystal panel 1.

The data control device 2 has a configuration shown in FIG.

The write control device 7 creates a write control signal WEN which is low in the H1 write state when it is in the read state from the YD signal and the LP signal. The ratio at which the write state occurs is initially determined by the circuit or can be set externally. Address counter 9 counts the X5CL signal and sends an address signal to display memory 1. In response to the write control signal WEN, the data pruning circuit 8 is in the read state and reversely connected in the connection-1 write state as shown in FIG.

In the read state, the WEN signal becomes H, the display memory 1 performs a read operation, and the display button read from the display memory 1 is sent to the liquid crystal display device. In the write state, the signal to WE becomes L, and external display data is written into the display memory by the X5CL signal. Further, display data from the outside is sent to the liquid crystal display device.

FIG. 4 shows the timing at which the display screen of the liquid crystal display device is rewritten every four screens. The WEN signal becomes L, which enters the writing state every four screens. The display data A that is continuously sent from the outside is recorded every 4 screens by the data control device.
1, and a display data is sent to the liquid crystal display device for four screens. Therefore, if the mouse or cursor is moving at high speed,
Since four screens are displayed, it is possible to eliminate the problem of the mouse or cursor disappearing while moving.

In this embodiment, the display data is loaded into the display memory every 4 screens, and the same screen is displayed for a display period of 4 screens, but the display data is loaded into the display memory every n screens, and the display data of the same screen is loaded into the display memory every n screens. It is also possible to easily display the image for a period of n screens. n is a positive integer, and when n was 4 or more, even if the mouse or cursor was moved at high speed, the moving mouse or cursor could be easily confirmed. By allowing n to be set freely from the outside, movement of the mouse or cursor can be easily confirmed even if the response speed of the liquid crystal panel changes due to temperature.

FIG. 5 shows another embodiment of the invention. If the display data and drive signal are CRT signals, the vertical synchronization signal VSY
NC1 horizontal synchronization signal Horizontal synchronization signal plane 5YNC red blue green is used to create display data and drive signals that can drive a liquid crystal display device using a serial-parallel conversion circuit 10, and is inputted to the data control device by the CRT signal. Even when driving a liquid crystal display device or moving a mouse or cursor at high speed, it is possible to eliminate the problem of the mouse or cursor disappearing while it is being moved.

[Effects of the Invention] As explained above, according to the present invention, since n-screen display is performed, even if the mouse or cursor is moved at high speed, the problem that the movement becomes discontinuous and disappears is eliminated. be able to.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a liquid crystal display device according to an embodiment of the present invention.
Fig. 2 is a characteristic diagram of the response speed of a liquid crystal display device, Fig. 3 is a configuration diagram of a data control device according to an embodiment of the present invention, Fig. 4 is a timing diagram of an embodiment of the present invention, and Fig. 5 is a diagram showing the characteristics of a data control device according to an embodiment of the present invention. FIG. 6 is a block diagram of a conventional liquid crystal display device. Display memory data control device Liquid crystal power supply circuit Scanning electrode drive circuit Signal electrode drive circuit Liquid crystal panel writing control device Data switching circuit Address counter Serial-to-parallel conversion circuit

Claims (1)

[Claims] In a liquid crystal display device that receives and displays continuously sent display data, there is a display memory that stores display data for one screen, and a write that writes the sent display data to the display memory every n screens. A liquid crystal display device comprising a data control device that switches between display data read from the display memory and continuously sent display data and sends the data to the liquid crystal display device for display.