JPH0419787A - liquid crystal display device - Google Patents

Abstract

PURPOSE:To display a mouse and a cursor in a movement period wherein the mouse and cursor are moved fast inputting display data to (n) display memories every time the display data is sent and ANDing or ORing display data of (n) pictures. CONSTITUTION:The display data which are sent successively are received and displayed. This device has a display memory 1 stored with the display data of the (n) pictures and a write control means which writes the sent display data in the display memories 1 for the (n) pictures and is provided with a data control means 2 which reads the display data out of the display memories 1, ANDs or ORs the display data of the (n) pictures, and sends and display them on the liquid crystal display device. Consequently, the display data of the (n) pictures are displayed on over another and even when the mouse and cursor are moved fast, the mouse and cursor in movement can be displayed in the display period of the (n) pictures, so such a problem that the mouse or cursor disappears is eliminated.

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 the configuration shown in Section 6.
Display data 15 that are continuously sent are displayed in sequence. Therefore, the frame circumference jF1 f='l is 70)l
When driven in the same manner, the data displayed is rewritten every 14 mS.

[Problems to be Solved by the Invention] The response speed of a liquid crystal display device has response characteristics as shown in FIG. Even if a lighting voltage is applied to a display pixel of a liquid crystal panel, it actually turns on after a time Tr after the lighting voltage is applied. Furthermore, even if the lamp voltage is set to the non-lighting voltage, the non-lighting state will be reached after time Tf.

Tr and Tf vary depending on the thickness of the liquid crystal layer of the liquid crystal panel, applied voltage, temperature, etc., but at 25℃, it is 100m5 to 30m5.
0m5 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 the screen of a liquid crystal display device, there is a problem in that the mouse or cursor disappears during the period of movement.

An object of the present invention is to provide a liquid crystal display device that can display a mouse or cursor during a movement period in which the mouse or cursor is moved at high speed.

[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 for storing display data and keys of n screens; It has a write control means that sequentially writes the sent display data to the display memory of the n screens, reads the display data from the display memory, and ANDs the display data of the n screens.
Alternatively, the present invention is characterized in that it is provided with a data control means that performs an OR operation and sends the result to a liquid crystal display device for display.

[Implementation Example 1] 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, which has a display memory for four screens. Reference numeral 6 indicates a signal electrode drive circuit for the liquid crystal panel 5, reference numeral 4 indicates a liquid crystal power supply circuit for the scanning electrode drive circuit 3, and reference numeral 1 indicates a display memory, which is divided into VRAMs 1 to 4 for each of the four screens. 2 is a data control device, 14 is a liquid crystal power supply, 15 is display data, and 16 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 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 YDj:i and a display data latch signal LP. The signal electrode drive circuit 5 takes in the display data sent from the data control device 2 into a shift register using a display data transfer port/ν signal X5CL, takes it into a latch circuit using an LP signal, and drives the signal electrodes of the liquid crystal panel 1. do.

The data management device 2 has the configuration shown in FIG.

The write control device 7 creates write control signals WE1 to WE4 which are low when in the read state and H1 when in the write state from the YD multiplied signal LP signal. Writing system (wholesale signals WE1 to WE4 are set to V as shown in the timing diagram of the 4th section)
RAMs 1 to 4 are designed to be in a write state sequentially. Address counter 9 counts the X5CL signal and sends address signals to display memories VRAM1-4. The data switching circuit 8 receives write control signals WE1~
4, the connection is made as shown in the data switching circuit 8 connected to WE1 in FIG. 3 in the read state, and the connection is made as shown in the data switching circuit 8 connected to WE1 in the write state.

In FIG. 3, WEI is currently ringing, and an external display data is written into the display memory VRAMI by the X5CL signal. Display data AND circuit 10. And the display data OR circuit 11 includes a display memory VRAM.
The display data read from 2 to 4 and the display data from the outside are input. When the display data for the next screen is sent, VRAM2 enters the write state, AND circuit 10, OR circuit 111: VRAM 1, V RA
M3-4 and display data from the outside are input.

In this way, each time the screen display data is sent, the oldest data in the display memory is switched to the latest display data, and the display data obtained by ANDing or ORing the display data of the four screens becomes as shown in Figure 4. Sent to the LCD display.

The AND10R switching circuit selects the OR circuit when the mouse or cursor display is lit, and selects the AND circuit when it is not lit.8 When the mouse or cursor display is lit, it selects the AND circuit. By ORLing the display data and ANDing the display data of 4 screens when the light is off, the moving mouse or cursor can be displayed during the display period of 4 screens, so the moving mouse or cursor can be displayed during the display period of 4 screens. This solves the problem of the mouse and cursor disappearing inside.

In the second embodiment, the display memory is for 4 screens, and the AND or OR of the display data for 4 screens is performed, but if the display memory is for 0 screens, the A of the display data for n screens is
ND or OR can be taken.

n is a positive integer greater than or equal to 1, and when n was greater than or equal to 4, movement of the mouse or cursor appeared to be smooth.

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 H3YNC Red, blue, and green display signals are used in a serial-parallel conversion circuit 10 to generate display data and drive signals capable of driving a liquid crystal display device, and are input to the data control device. With this configuration, the CRT signal can
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, even if the mouse or cursor is moved at high speed because the display data of n screens are displayed in a superimposed manner, the moving mouse or cursor is
Since the display period can be displayed on the screen, the problem of the mouse or cursor disappearing can be eliminated.

[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 response speed of the liquid crystal display device, and FIG. 3 is a block 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, Section 5 is a block diagram of a liquid crystal display device according to another embodiment of the present invention, and 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 Display data - AND circuit Display data - OR circuit AND10R switching circuit / serial-parallel conversion circuit Applicant Agent: Seiko Epson Corporation Patent Attorney Kisanbe Suzuki (and 1 other person) 1st ■

Claims (1)

[Claims] In a liquid crystal display device that receives and displays continuously sent display data, there is a display memory that stores the display data of n screens, and a display memory that stores the display data that is sent.
It has a write control means for sequentially writing to the display memory of the screen, and reads display data from the display memory,
1. A liquid crystal display device comprising data control means for ANDing or ORing the display data of n screens and sending the data to the liquid crystal display device for display.