JPH01989A - LCD panel positioning device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a positioning device for a liquid crystal display panel that performs positioning when inspecting a liquid crystal display panel.

(Prior Art) In recent years, liquid crystal display panels for televisions have been developed that are configured with 50,000 to 300,000 pixels by combining thin film transistors and color filters. Incidentally, such liquid crystal display panels are inspected for pixel defects, v1 degree unevenness, and afterimages, for example, but this inspection is performed by placing the liquid crystal display panel 1 on the driver board 2 as shown in FIG. Then, each connection terminal 1a of the liquid crystal display panel and the connection terminal 2a on the driver board 2 are electrically connected. A light box 4 is arranged below this driver base 12, and light from each fluorescent light 5, 6 arranged in this light box 4 is irradiated onto the liquid crystal display panel 1 as diffused light. . Then, a predetermined image is displayed on the liquid crystal display panel 1, and the displayed image is visually monitored to inspect for pixel defects and the like. However, the size of one pixel of the liquid crystal display panel 1 is about 100 to 300 μm on a side, and visual inspection is likely to cause false judgments, especially when inspecting pixel defects, resulting in variations in inspection results, and further reducing inspection efficiency. The problem is that it's bad. Therefore, a technology has been considered in which the liquid crystal display panel 1 on which a predetermined image is displayed is imaged by an imaging device such as an ITV (industrial television) camera, and the inspection is automatically performed by image processing the image data. ing.

However, the LCD panel 1 was scanned by an ITV camera.
In this case, if the liquid crystal display panel 1 is not accurately placed at a predetermined position on the driver board 2, the inspection cannot be performed with high precision. In other words, when inspecting pixel defects, for example, since the pixel size is extremely small as described above, a pixel different from the pixel to be inspected is inspected even if the placement position of the liquid crystal display panel 1 is slightly shifted. This is because you will have to do so.

(Problem to be Solved by the Invention) By the way, when the inspection is performed automatically, the position a of the liquid crystal display panel 1 is positioned by aligning each connection terminal 1a with each connection terminal 2a of the driver board 2. The extent of
It was not possible to position with high precision.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a positioning device for a liquid crystal display panel that can accurately position a liquid crystal display panel.

[Structure of the Invention] (Means for Solving the Problems) The present invention displays a predetermined image on a liquid crystal display panel placed on a driver board, and transports the liquid crystal display panel on which this image is displayed by an mmgi device. In a positioning device for a liquid crystal display panel when inspecting pixel defects, etc. by imaging, a correction mark display means for displaying a position correction mark at a predetermined position on the liquid crystal display panel, and a liquid crystal display panel IFilled by the m-imaging device A deviation that calculates the amount of deviation between the display position of the upper position correction mark and the reference display mark position! A positioning device for a liquid crystal display panel that aims to achieve the above object and includes a l calculation means and a position correction means for correcting the mounting position of the liquid crystal display panel according to the amount of deviation calculated by the deviation il calculation means. be.

(Function) By providing such a means, a position correction mark is displayed by the correction mark display means at a predetermined position on the liquid crystal display panel, and the amount of deviation between the display position of the position correction mark and the reference display mark position is displayed. is calculated by the deviation ill output means. Thus, the position correction means corrects the position of the liquid crystal display panel according to the amount of deviation.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same parts as in FIG. 4 are given the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 is a block diagram of a positioning device for a liquid crystal display panel. In the figure, 10 is an XY table, and this
A θ table 11 is arranged 1iQG on the table 10,
A light box 4 is provided on this θ table 11. A driver board 2 is placed roughly on this light box 4, and a liquid crystal display panel 1 is placed on this driver board 2. The XY table 10 is constructed by stacking an X table 10a and a Y table 10b, and each table 10a, 10b is provided with a motor, and these motors are driven by an XY table driver 12 to move them in parallel in the X-axis and Y-axis directions. It has become. Note that the XY table driver 12 is drive-controlled by an XY table controller 13. or,
The θ table 11 is provided with a motor for the rotation axis, and this motor is driven by the θ table driver 14 to rotate the θ
It is designed to rotate in one direction, that is, in the entire circumferential direction. Note that the θ table driver 14 is drive-controlled by a θ table controller 15.

A display controller 16 is connected to the driver board 2,
Under the display control of the display controller 16, electric signals are applied to each connection terminal of the driver board 2 for each inspection item, so that a predetermined image is displayed on the liquid crystal display panel 1. Incidentally, a position correction mark memory 17 is connected to this display controller 16, and the position correction mark memory 17 is used for position correction to display a position correction mark, for example, a cross pattern "+", at a predetermined position on the liquid crystal display panel 1. mark data is stored.

A light box controller 18 is connected to the light box 4 to control the brightness of the fluorescent lights arranged inside the light box 4.

On the other hand, an ITV camera 19 is arranged above the driver board 2, and an image signal output from the ITV camera 19 is digitized by an A/D (analog/digital) converter 20 and sent to an image memory 21. It has become. Further, a reference display mark memory 22 is provided, and this memory 22 stores a cross pattern "+" displayed on the liquid crystal display panel 1 when the liquid crystal display panel 1 is placed at a predetermined inspection position on the driver board 2. ” is stored.

Now, the deviation amount calculating section 23 receives the image data of the liquid crystal display panel 1 stored in the image memory 21 and executes image processing to find the position of the cross pattern "+", and calculates the position of the cross pattern "+" and the reference display mark memory 22. It has a function of calculating the deviation from the stored reference display mark position. The deviation amount protruding section 23 then controls the XY table controller 13 and the θ table controller 15 according to the deviation amount.
It has a function of sending out a deviation type correction ill all signal.

24 is a loader/unloader mechanism, which takes out the liquid crystal display panel 1 from an uninspected box (not shown) and places it on the driver board 2, and also loads the liquid crystal display panel 1 placed on the driver board 2. It has the function of being stored in an inspected box (not shown). The loader/unloader driver 25 drives the motor of the loader/unloader mechanism 24 and the motor of the hand 24a, and the loader/unloader controller 26 has a function of controlling the loader/unloader driver 25. Then, the display controller 16.
The light box controller 18, the deviation calculation unit 23, and the loader/unloader controller 26 are the main/sub m1B2
The operation is controlled by 7. In addition, driver board 2
A suction pump 29 is connected through an air hose 28 to fix the liquid crystal display panel 1 to the driver board 2 by the suction force of air.

Next, the operation of the apparatus constructed as described above will be explained according to the positioning flowchart shown in FIG. In step S1, when a loader command is sent from the main/sub unit 27 to the loader/unloader controller 26, the loader/unloader controller 26 receives a loader command.
Driven by the unloader driver 25, the loader/unloader mechanism 24 takes out the liquid crystal display panel 1 from the uninspected box and places it on the driver board 2. At this time, due to the suction action of the suction pump 29, the liquid crystal display panel 1
is fixed to the driver board 2. Next step S
2, the display controller 16 reads position correction mark data from the position correction mark memory 17 and sends a display control signal to the liquid crystal display panel 1 through the driver board 2. As a result, a predetermined position of the liquid crystal display panel 1, for example, a position near each corner facing each other as shown in FIG.
1f (Cx.

Cy) and (Dx, Dy) have a cross pattern “+
" is displayed. The I'TV camera 19 images the liquid crystal display panel 1 on which the cross pattern "+" is displayed and outputs the image signal. This image signal is digitized by the A/D converter 20 and stored in the image memory 21 as image data.

Here, the shift ffi generation unit 23 reads the image data stored in the image memory 21 and! ! The reference display mark data W stored in the quasi-display mark memory 22 is read. Here, there is a third mark on the reference display mark data W.
As shown in the figure, the cross pattern "+" is located at each position (A
X, Ay) and (Bx, By). Now, the deviation Ill output 23 executes image processing in step S3 to detect the shading level of the cross pattern "+", and from the pixel position of this shading level, the cross pattern "
+” position (CX, Cy) and ([)x, oy
), and in the next step S4, the slopes θ1 and θ2 are
and calculate the center of gravity (Xi, Yl) and (X2, Y2). That is, θ 1 − jan'! (By-Ay
) / (Bx -Ax) (Xl, Yl) = ((Bx +Ax)/2° (By +Ay) /2) θ2-tan' (Dy -CV) / (D
x −CX )(X2, Y2) −((Dx +CX)/2°(Dy +cy)/2). Then, in steps s5 and S6, the deviation correction unit 23 calculates the deviation (XI - and sent to the θ table controller 15. With a comb, the XY table 10 is
．． - It moves by (XI - X2, Yl - Y2), and the θ table 11 rotates by (θ1 - θ2). As a result, the cross pattern "
+" and the reference display mark are aligned, and the liquid crystal display panel 1 is positioned at a predetermined inspection position.

Thereafter, in step S7, a predetermined image is displayed on the liquid crystal display panel 1 by the display controller 16, and this image is captured by the ITV camera 19 to detect pixel defects and
Inspections such as brightness and afterimages are performed. When this inspection is completed, the liquid crystal display panel 1 is removed from the driver board 2 by the loader/unloader mechanism 24 and stored in the inspected box in step s8.

In this way, in the above embodiment, the liquid crystal display panel 1
A cross pattern "+" is displayed at a predetermined position, the amount of deviation between the display position of this cross pattern "+" and the reference display mark position is calculated, and the position of the liquid crystal display panel 1 is corrected according to this amount of deviation. Therefore, the liquid crystal display panel 1 can be automatically positioned at a predetermined inspection position with high precision, and this positioning can be performed by using the ITV camera 19 and image processing means used for inspecting the liquid crystal display panel 1 without using a separate positioning device. Can be used. Therefore, each pixel can be inspected for pixel defects and the like with high accuracy, and the inspection can also be carried out efficiently.

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof. For example, the position correction mark may be an x-order pattern or another pattern instead of the cross pattern "+". Furthermore, by applying this device, it is also possible to position liquid crystal televisions, plasma displays, and cathode ray tube displays.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a positioning device for a liquid crystal display panel that can accurately position a liquid crystal display panel.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of a liquid crystal display panel positioning device according to the present invention, FIG. 2 is a positioning flowchart of the device, and FIG. 3 is a schematic diagram for explaining the displacement calculation function of the device. , FIG. 4 is a diagram for explaining a conventional device. 1...Liquid crystal display panel, 2...driver board, 4...
...Light box, 10...XY table, 11.
...θ table, 12...XY table driver, 1
3...XY table controller, 14...θ table driver, 15...θ table controller, 1
6...Display controller, 17...Mark memory for position correction, 19...ITV camera, 21...iii
Image memory, 22... Reference display mark memory, 23...
- Displacement calculation unit, 24...Loader/unloader mechanism. Applicant's representative Patent attorney Takehiko Suzue Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a positioning device for a liquid crystal display panel when a predetermined image is displayed on a liquid crystal display panel mounted on a driver board, and the liquid crystal display panel on which this image is displayed is imaged by an imaging device to inspect pixel defects, etc. , a correction mark display means for displaying a position correction mark at a predetermined position on the liquid crystal display panel; and a display position of the position correction mark on the liquid crystal display panel imaged by the imaging device and a reference set in advance. The liquid crystal display panel includes a deviation amount calculation means for calculating an amount of deviation from a display mark position, and a position correction means for correcting the mounting position of the liquid crystal display panel according to the deviation amount calculated by the deviation amount calculation means. A positioning device for a liquid crystal display panel, characterized in that: