JP2003149081A - Method of inspecting display device and inspecting apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform highly accurate and detailed inspections on display devices, perform stable inspections by quantitatively evaluating the display devices, and determine the characteristics, etc., of manufacturing lines. SOLUTION: In a display device Zn 100 constituted of a plurality of dots (the minimum unit of a display area), each dot is lighted up and displayed for every dot to detect display characteristics such as luminance for every dot and form data. Analyses such as the comparison of the formed data are performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device inspection method and an inspection device using the same.

[0002]

2. Description of the Related Art In the conventional inspection of a display device, although some inspection items are automatically converted into data, such as a flicker inspection, a visual sensory inspection is mainly used.

[0003]

In the case of the visual inspection as in the conventional example, the inspection is not stable because the pass / fail criterion differs depending on the skill level of the measurer. It is difficult to understand how defective the pixels are, how the defective pixels are distributed, etc.
There are problems that it is difficult to accumulate the evaluation results as quantitative data, and it is difficult to determine the characteristics of the manufacturing line.

[0004]

The invention according to claim 1 of the present application is as follows.
In a display device composed of a plurality of dots (minimum unit of display area), each dot is lit up and displayed for each dot, and display characteristics such as brightness are detected for each dot and converted into data, which are displayed. The method is an inspection method for detecting, for example, display unevenness and point defects by performing analysis such as comparison.

The invention according to claim 2 of the present application is composed of a plurality of pixels (the smallest unit of the display area capable of displaying white is generally composed of 3 dots of RGB, but is not limited thereto). In a display device according to the present invention, each pixel is lit and displayed for each pixel, and display characteristics such as brightness are detected for each pixel, converted into data, and analyzed such as comparing them to obtain display unevenness. And an inspection method for detecting point defects and the like.

The invention of claim 3 of the present application is an inspection apparatus for automatically performing the inspection method according to claim 1 or 2.

A display device manufactured by using the above-described inspection method or inspection device has extremely few display unevenness and point defects.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The method for inspecting a display device according to the first aspect of the present invention is considered to have the same concrete means as the method for inspecting the display device according to the second aspect of the present invention. The case of inspecting the display device inspection method in 2 using the display device inspection device in 3 of the present invention will be an embodiment of the invention. 1 to 4 are used for the description.

Here, description will be made by taking as an example the steps of measuring the luminance of each pixel and obtaining the distribution tendency of the luminance variation of the display device. However, the present invention is not limited to the luminance variation, but also the color tone distribution, the number of black dots, It can be used to inspect various characteristics of display devices such as the number of bright spots. Further, although the description will be made without particularly limiting the type of the display device, it is an inspection method that can be used in any display device including a plurality of dots or pixels such as a liquid crystal display device, a plasma display device, an organic EL display device, and the like. .

FIG. 1 shows an image diagram of the entire inspection. A signal is sent from the signal generator 300 to display the Zn-th display device 1
Only the pixel 101 having the (X1, Ym) coordinate of 00 is turned on with a certain gradation 301. And pixel 101
The brightness of the light is picked up by the measuring device 200, and the calculator 400
Is being processed in. The signal generator 300 is also a computer 400.
Since it is controlled by, the measurement result is automatically displayed on the Zth sheet (X,
Y) Data is obtained as the luminance of the coordinate pixel. This operation is sequentially performed for all pixels of the Zn-th display device 100, and the same measurement is performed for all display devices. A graph 500 is a graph of the brightness of each pixel of the Zn-th display device 100.

The details of graph 500 are shown in FIG. When a pixel (X, Y) having a certain gradation 301 is turned on, if the pixel is normal, the luminance becomes 501. If the allowable range of brightness variation is 502, it is 5 at a glance.
03, 504, and 505 can be judged to be defective. Especially 504
Is a black dot and 505 is a bright dot.

FIG. 3 is a luminance distribution diagram in which the luminance data of each pixel of the Zn-th display device is applied to the coordinates of the pixel.
00. In the luminance distribution diagram 600, the luminance distribution of the display device can be understood more accurately and clearly. FIG. 4 is a luminance distribution tendency diagram 7 obtained by superimposing the luminance distribution diagrams 600 of all the inspected display devices.
00. By doing so, the tendency of the luminance distribution of the display device becomes clear. In the case of the luminance distribution tendency diagram 700, there is diagonal luminance unevenness. It is suggested that the display device which is made to flow in this manufacturing line tends to have uneven brightness in a diagonal direction.

[0013]

According to the present invention, the display device can be inspected accurately and in detail, and the display device can be quantitatively evaluated, so that it depends on the skill level of the measurer. It is possible to perform a stable inspection without Moreover, since it is easy to store data, it is possible to determine the characteristics of the manufacturing line.

[Brief description of drawings]

FIG. 1 is a diagram showing a measurement system according to a first embodiment, a second embodiment, and a third embodiment of the present invention.

FIG. 2 is a diagram showing measurement data according to the first embodiment, the second embodiment, and the third embodiment of the present invention.

FIG. 3 is a luminance distribution diagram in the first, second and third embodiments of the present invention.

FIG. 4 is a luminance distribution tendency chart in the first, second and third embodiments of the present invention.

[Explanation of symbols]

100 display device Zn 101 (Xl, Ym) coordinate lighting pixel 200 luminance meter 300 signal generator 301 Some gradation used for luminance measurement 400 calculator 500 Luminance-coordinate data of display device Zn 501 desired brightness when lit with gradation 301 502 Brightness variation allowable range 503 bad pixel 504 defective pixel (black dot) 505 defective pixel (bright spot) 600 Brightness distribution diagram of display device Zn 700 Luminance distribution trend diagram of all measured display devices

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Claims (3)

[Claims] 1. A plurality of dots (minimum unit of display area)
A method of inspecting a display device, comprising: illuminating and displaying the plurality of dots for each dot,
A method for inspecting a display device, which comprises detecting display characteristics such as color tone for each dot, converting the data into data, and performing analysis to detect display unevenness and point defects of the display device. 2. A method for inspecting a display device in which display pixels (pixels) each including a plurality of dots are arranged, wherein the display pixels are lit and displayed for each display pixel, and the luminance, chromaticity, and color are displayed. A method for inspecting a display device, which comprises detecting display characteristics such as taste for each display pixel, converting the data into data, and performing analysis to detect display unevenness and point defects in the display device. 3. An inspection apparatus having the inspection method according to claim 1.