JPH04244929A - Optical type liquid crystal display defect inspection device - Google Patents

Abstract

PURPOSE:To obtain an optical liquid crystal display defect inspection device for inspecting a defect of a liquid crystal display in a relatively simple configuration. CONSTITUTION:A liquid crystal display 3 is placed on a movable stage 2. While it is moved in one direction, a pattern is displayed on the liquid crystal display 3, a pattern on the surface of the liquid crystal display 3 is read by an image sensor, and is compared with a reference pattern. If they agree with each other, it is determined that the liquid crystal display 3 is a good product. Otherwise, it is determined to be a defective product.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical liquid crystal display defect inspection apparatus, and more particularly to an optical liquid crystal display defect inspection apparatus for inspecting defects in electrodes formed on a liquid crystal display.

0002

BACKGROUND OF THE INVENTION Recently, liquid crystal displays have been increasingly used in various electronic devices. Moreover, the amount of information displayed on liquid crystal displays is increasing, and liquid crystal displays with high display density are required. In order to increase the display density, it is necessary to make the wiring pattern between the liquid crystal display and the terminal thinner and to reduce the distance between adjacent patterns. However, when the pattern density is increased, adjacent patterns may be electrically connected to each other due to insufficient etching during the pattern etching process.

[0003] Usually, a color liquid crystal display is
After a glass substrate is created in a glass substrate creation process, a simple matrix pattern or an active matrix pattern is formed in a pattern formation process, and a color filter or the like is bonded to a panel on which a circuit pattern is formed in an assembly process. Inspection for defects is performed in the manufacturing process of liquid crystal displays, and there are two types of defect inspection: one is performed after the pattern formation process is completed, and the other is performed after assembly. Conventionally, to detect such defects, a method of visual inspection or probing was used, in which a pin was placed on an electrode and a current was applied to check for the presence or absence of contact.

[0004] However, the visual inspection method requires a long time for inspection, and the probing method requires a large amount of labor since it is necessary to erect a pin on the electrode each time.

[0005] Therefore, the main object of the present invention is to provide an optical liquid crystal display defect inspection apparatus that can inspect liquid crystal displays for defects with a relatively simple configuration.

[0006]

[Means for Solving the Problems] The present invention is an optical liquid crystal display defect inspection device for inspecting defects in a liquid crystal display, which includes a movable stage for moving the liquid crystal display in one direction, and a movable stage for inspecting the liquid crystal display. an image sensor provided above the movable stage to read the pattern on the surface of the liquid crystal display; and a means for displaying a pattern on the liquid crystal display by comparing the image read by the image sensor with a predetermined standard image. The device is configured to include a determining means for determining defects in the device.

[0007]

[Operation] The optical liquid crystal display defect inspection device according to the present invention places a liquid crystal display on a movable stage, moves it in one direction, reads the image with an image sensor, and compares the image with a standard image. Determine defects.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic block diagram of an embodiment of the present invention. Referring to FIG. 1, a movable stage 2 is provided on a table 1. The movable stage 2 is for moving the liquid crystal display 3 in one direction,
For example, it is driven by a linear motor. A CCD unit 4 is provided above the movable stage 2. CCD
The unit 4 reads the display pattern of the liquid crystal display 3 that is moved in one direction by the movable stage 2, and uses, for example, a CCD image sensor.

A personal computer 5 is provided for overall control. personal computer 5
In order to control the CCD unit 4, the CCD control circuit 6 outputs a control signal to the CCD drive circuit 7, and the CCD
The drive circuit 7 drives the CCD unit 4 according to the control signal. The read output of the CCD unit 4 is given to a personal computer 5. Furthermore, the personal computer 5 generates a pulse signal from a pulse generator 8,
This pulse signal is given to the table positioning unit 9, and the table positioning unit 9 sequentially moves the movable stage 2 in one direction according to the pulse signal, thereby positioning the movable stage 2. The personal computer 5 further generates display pattern data for inspection from a pattern generator 10. This pattern data is given to the LCD drive circuit 11. LCD drive circuit 1
1 drives the liquid crystal display 3 to display the pattern according to the given pattern data.

FIG. 2 is a flowchart for explaining the specific operation of one embodiment of the present invention. Next, with reference to FIGS. 1 and 2, a detailed operation of an embodiment of the present invention will be described. First, the liquid crystal display 3 is loaded onto the movable stage 2. Personal computer 5 generates pattern data from pattern generator 10. The LCD drive circuit 11 causes the liquid crystal display 3 to display a display pattern according to the pattern data. The personal computer 5 generates a pulse signal from a pulse generator 8, and the table positioning unit 9 sequentially moves the movable stage 2 in one direction in response to the pulse signal. The personal computer 5 generates a control signal from the CCD control circuit 6, and the CCD drive circuit 7 drives the CCD unit 4 in accordance with the control signal. The CCD unit 4 reads the pattern displayed on the liquid crystal display 3 on the movable stage 2 that moves sequentially, and provides the read output to the personal computer 5.

The personal computer 5 processes the data from the read output and determines whether it matches a pre-stored standard pattern. If there is a discrepancy, the inspected liquid crystal display 3 is determined to be a defective product and processed, and if it is a non-defective product, it is processed as a non-defective product, and the result is printed on a printer (not shown) or displayed on a CRT display (not shown). let After that, personal computer 5
moves the movable stage 2 in the opposite direction, and when it returns to its original position, unloads the liquid crystal display 3. Then, the above-described operation is repeated to test the next liquid crystal display.

0012

As described above, according to the present invention, by moving a pattern in one direction while displaying a pattern on a liquid crystal display, reading the pattern with an image sensor, and determining whether it matches a standard pattern, Defects in liquid crystal displays can be easily identified with a relatively simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an embodiment of the invention.

FIG. 2 is a flow diagram for explaining the operation of an embodiment of the present invention.

[Explanation of symbols]

1 Table 2 Movable stage 3. Liquid crystal display 4 CCD unit 5 Personal computer 6 CCD control circuit 7 CCD drive circuit 8 Pulse generator 9 Table positioning unit 10 Pattern generator 11 LCD drive circuit

Claims (1)

[Claims] 1. An optical liquid crystal display defect inspection device for inspecting defects in a liquid crystal display, comprising: a movable stage for moving the liquid crystal display in one direction; and a movable stage for displaying a pattern for inspection on the liquid crystal display. an image sensor that is provided above the movable stage and reads an image pattern on the surface of the liquid crystal display; and a means that compares the image read by the image sensor with a predetermined standard image to determine the image of the liquid crystal display. An optical liquid crystal display defect inspection device equipped with a determination means for determining defects.