JPH03134695A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To change or correct the luminance of a liquid crystal panel by suitably reading out a turning ON/OFF pattern from a memory address counter. CONSTITUTION:A display control part 2 outputs a timing signal for correct display to a liquid crystal panel 1, frame buffer 3 and memory address counter 12. A gradient attribute signal 9 read out from the frame buffer 3 is inputted to a selector 5. The memory address counter 12 reads out a gradient pattern 10 corresponding to the turning ON/OFF pattern inputted to a memory 14 and inputs the pattern 10 to the selector 5 and the luminance property of the liquid crystal panel 1 is corrected. Display data 11 from the selector 5 are sent to the liquid crystal panel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid crystal display device, and particularly to gradation display of a liquid crystal display device.

(Prior Art) In recent years, demand for large-screen, thin liquid crystal display devices has been increasing in the field of information equipment, mainly computers.

Among these, the gradation display of liquid crystal display devices is attracting particular attention.

FIG. 5 is a block diagram showing the configuration of a conventional liquid crystal display device, in which 1 is a liquid crystal panel, 2 is a display control section, 3 is a frame buffer, 4 is a gradation pattern generation section, 5 is a selector, and 6 is a block diagram showing the configuration of a conventional liquid crystal display device.
7 is a display timing signal sent from the display control section 2 to the liquid crystal panel 1, and 7 is a gradation pattern generation section 4 sent from the display control section 2.
8 is a frame buffer read signal sent from the display control section 2 to the frame buffer 3; 9 is a gradation attribute signal sent from the frame buffer 3 to the selector 5; 10 is a gradation pattern generation section 4 A gradation pattern signal sent from to the selector 5, 11
is display data sent from the selector 5 to the liquid crystal panel 1.

In the figure, 1 display control unit 2 includes a liquid crystal panel 1° frame buffer 3. A timing signal for correct display is generated for the Ill' tone pattern generating section 4. The gradation attribute signal 9, which is data read out from the frame buffer 3, is a signal that produces a gradation corresponding to the dots on the display screen. The gradation pattern signal IO outputted from the gradation pattern generating section 4 corresponds to a blinking pattern (gradation pattern) when obtaining gradations by changing the frequency of blinking of the display. The gradation attribute signal 9 is converted into the gradation pattern signal 1 by the selector 5.
0 is selected and the display data 11 is sent to the liquid crystal panel 1.

The gradation pattern generating section 4 generates eight types of gradation pattern signals 10 when the number of displayed gradations is eight.

(Problem to be Solved by the Invention) However, in the conventional device described above, since the gradation pattern generating section 4 can only generate a certain gradation pattern signal IO, when the liquid crystal panel 1 is changed to another one, the liquid crystal There was a problem in that the brightness varied due to differences in the characteristics of the panel 1.

An object of the present invention is to provide a liquid crystal display device that can change and correct the brightness of a liquid crystal panel.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a liquid crystal display device that obtains gradation by changing the frequency of blinking of the display, and provides an arbitrary method including a blinking pattern of the gradation to be displayed. The present invention is characterized by comprising a memory that can store blinking patterns and a memory address counter that reads the blinking patterns from this memory.

(Function) Since the above means is adopted, the brightness characteristics of the liquid crystal panel can be changed by appropriately reading out the flashing pattern arbitrarily stored in the memory using the memory address counter.
It can be corrected.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the liquid crystal display device of the present invention, in which members corresponding to those explained in FIG. 5 are given the same reference numerals, and 12 is a memory address counter; I3 is a memory address signal output from the memory address counter 12, and 14 is a blinking pattern storage memory for storing an arbitrary blinking pattern.

In the figure, a display control unit 2 includes a liquid crystal panel 1, a frame buffer 3. A timing signal for correct display is generated for the memory address counter 12. The gradation attribute signal 9, which is data read out from the frame buffer 3, is a signal that produces a gradation corresponding to the dots on the display screen. The memory address counter 12 reads out the gradation pattern signal lO corresponding to the blinking pattern input to the memory 14.

Blinking patterns of arbitrary gradations including the blinking pattern of the gradation to be displayed are written in advance in the memory 14, and can be rewritten as appropriate.

For example, if the number of display gradations is eight, and as shown in Figure 2, if LCD panel A and another LCD panel B have different brightness characteristics, then LCD panel When trying to emit a light, change the blinking pattern and increase the overall brightness.

For example, if the number of gradations that can be expressed by the memory 14 and the memory address counter 12 is 16, and the brightness characteristics of the liquid crystal panel A are as shown in FIG. Select the following eight blinking patterns to be input in step 14.

In other words, the first gradation is the fourth flashing pattern out of 16 types, the second Fl
The tone is the 8th flashing pattern out of 16 types, and the 3rd gradation is 1.
The 11th blinking pattern out of 6 types, the 4th gradation, the 12th blinking pattern out of 16 types, the 5th gradation, the 13th blinking pattern out of 16 types, the 6th gradation, the 6th gradation out of 16 types. 14 flashing patterns.

The 7th gradation is the 15th flashing pattern out of 16 types.

The 8th gradation is assumed to be the 16th blinking pattern out of 16 types. This makes it possible to make the luminance characteristics of liquid crystal panel A and liquid crystal panel B substantially equal, as shown in FIG. 4.

In this way, according to this embodiment, the number of display gradations (8 gradations)
The brightness characteristics of the liquid crystal panel 1 can be corrected by providing a memory 14 capable of expressing a larger number of blinking patterns (16 types generated) and a memory address counter 12, and writing an arbitrary blinking pattern into the memory 14.

Note that although this embodiment has described approximating the brightness characteristics of different liquid crystal panels A and B, it can also be used to change the contrast of one liquid crystal panel. Also, the brightness can be changed even when the number of display gradations and the number of blinking patterns are the same.

(Effects of the Invention) According to the present invention, it is possible to provide a liquid crystal display device in which brightness characteristics can be changed and corrected by appropriately reading a blinking pattern, and the brightness required for a liquid crystal panel can be generated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the liquid crystal display device according to the present invention, FIGS. 2, 3, and 4 are explanatory diagrams showing the brightness characteristics of the liquid crystal panel, and FIG. FIG. 2 is a block diagram showing the configuration of a display device. 1...Liquid crystal panel, 2...Display control section, 3.
... frame buffer, 5 ... selector, 6
...Display timing signal, 7...Pattern generation timing signal, 8...Frame buffer read signal, 9...Gradation attribute signal, 10...Blinking pattern (gradation pattern signal), 11... -Display data, 12...Memory address counter, 13...Memory address signal, 14...Memory. Fig. 4 Flashing Bakoon extinction pattern Fig. 4 Hon pattern Fig.

Claims (1)

[Claims] In a liquid crystal display device that obtains gradations by changing the frequency of blinking of the display, a memory that can store any blinking pattern including the blinking pattern of the gradation to be displayed, and a memory address counter that reads the blinking pattern from this memory. A liquid crystal display device comprising: