JPH04324493A - Reliability evaluation device for liquid crystal display - Google Patents

Abstract

PURPOSE:To automate the evaluating operation for the liquid crystal display and to improve the accuracy of the evaluation and save the labor. CONSTITUTION:A liquid crystal display image is inputted to an image input part 1 and stored in an initial image storage part 2 as an image in the beginning of the evaluation, and an image in the evaluation is stored in an evaluation image storage part 3; and an image comparison part 4 compares the image data in the initial image storage part 2 with the image data in the evaluation image storage part 3, the comparison result is stored in a comparison result storage part 5, and the data stored in the comparison result storage part 5 is outputted by a data output part 6 to greatly decrease the man-hours of the evaluation and greatly improve the reliability of the data.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reliability evaluation device for a liquid crystal display, and more particularly to a reliability evaluation device for a monitor type liquid crystal display that constantly monitors a liquid crystal image.

0002

[Prior Art] Conventional reliability evaluation of liquid crystal displays involves operating the liquid crystal display under constant or variable temperature and humidity conditions and checking the display screen at regular intervals, depending on the type of reliability evaluation test. , create a sketch diagram, or
Alternatively, by taking a photograph or the like, the display screen is compared with a sketch or photograph of the initial display screen to check whether line defects, display unevenness, point defects, etc. have occurred on the display screen. In other words, because the checks were done manually, they were not checked at night or on holidays, and only checked at regular intervals during the daytime on weekdays.

[0003] When evaluating high-temperature operation of a liquid crystal display, the liquid crystal display was operated in a high-temperature room.

0004

Problems to be Solved by the Invention This conventional reliability evaluation of liquid crystal displays has the following drawbacks. In other words, (1) The display screen of the liquid crystal display is displayed at regular intervals,
In particular, since the check is performed only during the daytime on weekdays, it is not possible to accurately determine the time when display screen abnormalities such as line defects and display unevenness occur. (2) High-temperature evaluation of liquid crystal displays involves manual checking under high temperatures, which forces workers to perform harsh work. (3) Since the check is performed many times at regular intervals until the evaluation is completed, the check data becomes enormous and requires a large amount of man-hours to organize. There were drawbacks such as.

An object of the present invention is to provide a reliability evaluation device for a liquid crystal display that automates the manual evaluation work.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the reliability evaluation device for a liquid crystal display according to the present invention includes an image input unit for inputting a liquid crystal display image, and an initial image for storing an image at the initial stage of evaluation. a storage section, an evaluation image storage section that stores an image under evaluation, an image comparison section that compares image data in the initial image storage section and image data in the evaluation image storage section, and a comparison result storage that stores the comparison results. and a data output section that outputs the data stored in the comparison result storage section.

[0007] Furthermore, an optical characteristic input section for inputting optical characteristic values is used instead of the image input section, and an initial characteristic storage section for storing optical characteristic values at the initial stage of evaluation is used instead of the initial image storage section. In place of the evaluation image storage unit, an evaluation characteristic storage unit that stores the image under evaluation is used, and in place of the image comparison unit, optical characteristic values of the initial characteristic storage unit and the evaluation image storage unit are used. A characteristic comparison section is used for comparison.

[0008]

[Operation] The display image or optical characteristic value at the initial stage of evaluation is compared with the evaluation target, the result is stored, and the data is outputted as necessary.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a reliability evaluation apparatus for a liquid crystal display according to Embodiment 1 of the present invention.

[0011] In the figure, a display image at the initial stage of evaluation of a liquid crystal display placed under constant temperature and humidity conditions is a CCD image.
The image is read by an image input unit 1 composed of a camera, etc.
The image data is stored as image data in the initial image storage unit 2, which is composed of an IC memory or the like.

Next, the display image of the liquid crystal display under evaluation after a certain period of time has passed is read by the image input section 1, and is stored as image data in the evaluation image storage section 3 constituted by an IC memory or the like.

The image data in the initial image storage section 2 and the image data in the evaluation image storage section 3 are sent to an image comparison section 4 composed of an IC logic circuit or the like and are compared. As a result of the comparison,
When a difference is found, image data indicating the shape and position of the difference and the time at which the difference was found are stored in the comparison result storage section 5, which is comprised of an IC memory or the like.

Further, after a certain period of time has elapsed, the image displayed on the liquid crystal display is read by the image input section 1 and stored in the evaluation image storage section 3 as image data. As described above, the abnormal image data of the liquid crystal display under evaluation and the abnormality occurrence time are sequentially stored in the comparison result storage section 5.

The data stored in the comparison result storage section 5 is as follows:
Data output unit 6 consisting of a display device, a printing device, etc.
is output to.

(Embodiment 2) FIG. 2 is a block diagram showing a reliability evaluation apparatus for a liquid crystal display according to Embodiment 2 of the present invention.

In Example 1, the display image was evaluated, but in Example 2, the optical characteristic values were evaluated.

That is, instead of the image input section 1 of the first embodiment, it is composed of a luminance meter, a spectrum analyzer, etc.
An optical property input unit 7 for inputting optical property values is used, an initial property storage unit 8 for storing optical property values at the initial stage of evaluation is used instead of the initial image storage unit 2, and an evaluation image storage unit 3 is used instead of the evaluation image storage unit 3. , a characteristic value comparison section that uses the evaluation characteristic storage section 9 that stores the optical characteristic values under evaluation, and compares the optical characteristic values of the initial characteristic storage section 8 and the evaluation characteristic storage section 9 instead of the image comparison section 4. 10 is used to evaluate the reliability of a liquid crystal display using optical characteristic values (contrast, brightness unevenness, chromaticity gamut, transmittance, flicker, etc.). The operating principle of this embodiment is the same as that of the first embodiment.

This embodiment has the advantage that changes in optical characteristic values can be continuously determined over time.

[0020]

Effects of the Invention As explained above, the present invention automates the conventional manual evaluation work, so it is possible to check the display screen of a liquid crystal display at regular time intervals (continuously), thereby eliminating line defects and display irregularities. It is possible to accurately record the shape, location, and time of occurrence of abnormalities such as Furthermore, the harsh manual evaluation work at high temperatures when evaluating liquid crystal displays at high temperatures is eliminated, and evaluation data is automatically organized, making it possible to significantly save labor in evaluation work.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

[Explanation of symbols]

1 Image input section 2 Initial image storage unit 3 Evaluation image storage unit 4 Image comparison section 5 Comparison result storage section 6 Data output section 7 Optical characteristics input section 8 Initial characteristic storage section 9 Evaluation characteristic storage section 10 Characteristic value comparison section

Claims (2)

[Claims] 1. An image input section for inputting a liquid crystal display image, an initial image storage section for storing an image at an initial stage of evaluation, an evaluation image storage section for storing an image under evaluation, and image data in the initial image storage section. A liquid crystal display comprising: an image comparison section that compares the image data in the evaluation image storage section; a comparison result storage section that stores the comparison results; and a data output section that outputs the data stored in the comparison result storage section. Display reliability evaluation device. 2. An optical characteristic input section for inputting optical characteristic values is used instead of the image input section, and an initial characteristic storage section for storing optical characteristic values at an initial stage of evaluation is used instead of the initial image storage section. In place of the evaluation image storage unit, an evaluation characteristic storage unit that stores the image under evaluation is used, and in place of the image comparison unit, optical characteristic values of the initial characteristic storage unit and the evaluation image storage unit are used. 2. The reliability evaluation device for a liquid crystal display according to claim 1, further comprising a characteristic comparison section for comparison.