JPH0527702A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To allow the easy execution of a contrast adjustment while making gradation display by providing an arithmetic section which adds and sub data in accordance with an external instruction after processing input data. CONSTITUTION:The digital display input data 1 of respectively m bit of a red signal (R), green signal (G) and blue signal (B) are stored in an input data processing section 2 and the respective signals R, G, B are matched in timing. The data signals processed in the input processing section 2 are then subjected to addition and subtraction according to an external signal 9 in the arithmetic section 3 and are subjected to a level shift for a contrast adjustment. The output signals of the arithmetic section 3 are converted to respectively corresponding analog signals in a gradation generating liquid crystal circuit section 4 which delivers a liquid crystal driving output signal 5. The liquid crystal display device is driven by the signal 5 by which the prescribed display is made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device capable of easily performing contrast adjustment and complementary color display while performing gradation display.

[0002]

2. Description of the Related Art In recent years, in the field of information equipment centering on computers, the demand for liquid crystal display devices capable of full color display and high image quality has been increasing as the size and weight have been reduced.

A conventional liquid crystal display device will be described below. FIG. 3 shows a configuration diagram of a conventional liquid crystal display device. In FIG. 3, 1 is digital display input data consisting of m-bit red signal, green signal and blue signal (hereinafter referred to as R, G, B signals), and 2 is input data for processing these digital display input data. Data processing unit 4 is an input data processing unit 2
The grayscale generation liquid crystal drive circuit section 5 for generating a gradation based on the output signal of is a liquid crystal drive output signal output from the gradation generation liquid crystal drive circuit section 4.

The operation of the liquid crystal display device constructed as above will be described below. First, as shown in FIG. 3, the input data processing unit 2 has m-bit R,
The digital display input data 1 consisting of G and B signals is stored and the timings of the R, G and B signals are adjusted. The output signal of the input data processing unit 2 is supplied to the grayscale generation liquid crystal drive circuit 4. The gradation generation liquid crystal drive circuit 4 converts the digital display input data into corresponding analog voltages for gradation display, and outputs a liquid crystal drive output signal 5 for driving the liquid crystal.

[0005]

However, in the above-mentioned conventional structure, although gradation display is possible, the relationship between the digital value and the analog output voltage value is fixed, so that contrast adjustment and complementary color display are difficult. It had a drawback.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a liquid crystal display device which facilitates contrast adjustment and complementary color display.

[0007]

A liquid crystal display device according to the present invention comprises an input data processing section, an arithmetic section for adding and subtracting data according to an external command, and a gradation generating liquid crystal drive circuit section. It has a different configuration.

Further, the liquid crystal display device of the present invention is an input device.
It has a configuration including a data processing section, a processing data inverting section for inverting data according to an external command, and a gradation generating liquid crystal drive circuit section.

[0009]

As described above, by providing an arithmetic unit for adding and subtracting data according to an external command after processing the input data, it is possible to facilitate contrast adjustment while displaying gradation.

Further, by providing a processing data reversing unit for reversing the data in accordance with an external command after processing the input data, it is possible to facilitate the complementary color display while performing the gradation display.

[0011]

EXAMPLE A liquid crystal display device according to a first example of the present invention will be described below with reference to FIG.

In FIG. 1, 1 is digital display input data consisting of m-bit R, G, and B signals, 2 is an input data processing unit, 3 is an arithmetic unit, and 4 is a gradation generating liquid crystal drive circuit. Parts 5 are liquid crystal drive output signals, and 9 is an external signal.

The operation of the liquid crystal display device of this embodiment having the above structure will be described below.

First, the digital display input data 1 of m bits for each of R, G and B is processed in the input data processing unit 2 in the same manner as in the prior art. The data signal processed by the input data processing unit 2 is added and subtracted inside the arithmetic unit 3 according to the external signal 9 to perform level shift for contrast adjustment. The output signal of the arithmetic unit 3 is input to the grayscale generation liquid crystal drive circuit unit 4, where the grayscale is generated by the same processing as the conventional one. Then, a liquid crystal display (not shown) is driven by the liquid crystal drive output signal 5 output from the gradation generation liquid crystal drive circuit section 4 to perform a predetermined display.

As described above, according to this embodiment, the external signal 9 is supplied to the stage before the gradation generating liquid crystal drive circuit section 4 in accordance with the data.
By providing the arithmetic unit 3 that performs addition and subtraction processing of the digital signal, contrast adjustment can be facilitated while performing display gradation.

Next, a liquid crystal display device according to a second embodiment of the present invention will be described with reference to FIG.

In FIG. 2, 1 is digital display input data consisting of m-bit R, G, and B signals, 2 is an input data processing unit, 6 is a processing data inverting unit, and 4 is a gradation. The generated liquid crystal drive circuit section, 5 is a liquid crystal drive output signal, and 10 is an external signal.

The operation of the liquid crystal display device of this embodiment having the above structure will be described below.

First, the digital display input data 1 consisting of m-bit R, G and B signals are processed in the input data processing unit 2 in the same manner as in the prior art. The processed data signal is inverted inside the processed data inverting section 6 according to the external signal 10. The inverted data is input to the grayscale generation liquid crystal drive circuit unit 4, and the grayscale is generated here as in the conventional case. Then, a liquid crystal display (not shown) is driven by the liquid crystal drive output signal 5 output from the gradation generation liquid crystal drive circuit section 4 to perform a predetermined display.

As described above, according to the present embodiment, by providing the processing data inverting section 6 for inverting the data signal in the preceding stage of the gradation generating liquid crystal drive circuit section 4, the gradation of the display is performed. However, the complementary color display can be facilitated.

Although FIG. 1 and FIG. 2 show examples in which the contrast adjustment and the complementary color display are performed separately, both functions are incorporated into one system, and the contrast adjustment and the complementary color display are performed simultaneously while performing the gradation of the display. You may be able to do it.

[0022]

According to the present invention, it is possible to realize an excellent liquid crystal display device capable of facilitating contrast adjustment and complementary color display while performing gradation display.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a conventional liquid crystal display device.

[Explanation of symbols]

1 m bit digital display input data 2 Input data processing unit 3 operation unit 4 gradation generation liquid crystal drive circuit section 5 LCD drive output signal 6 Processing data inversion unit 9 External signal 10 External signal

Claims (2)

[Claims] 1. An input data processing unit for processing digital display input data consisting of a red signal, a green signal and a blue signal, and addition and subtraction of data processed by the input data processing unit according to an external signal. And a gradation generating liquid crystal drive circuit section for generating a gradation based on an output signal of the arithmetic section to generate a liquid crystal drive output signal. 2. An input data processing section for processing digital display input data consisting of a red signal, a green signal and a blue signal, and the data processed by said input data processing section is inverted in accordance with an external signal. A liquid crystal display device comprising: a processing data inverting section for performing the processing; .