KR101537656B1 - Inspection method and inspector for liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for inspecting optical characteristics of an image display panel, and more particularly, Disposing one or more reflectors so that an angle with the image display panel is 108 to 120 占; And a step of comparing the optical characteristics of the image displayed on the reflector with each other to determine whether or not the optical characteristics are defective. Thus, the optical characteristics (color, brightness, smear) of the image display panel in the front and the slope And the like) can be compared at a time, and the accuracy of the inspection can be remarkably improved.

Image display panel, reflector, inspection

Description

TECHNICAL FIELD [0001] The present invention relates to a method of inspecting optical characteristics of an image display panel,

INDUSTRIAL APPLICABILITY The present invention can compare the optical characteristics (performance and defects such as color, brightness, unevenness, and the like) of the image display panel in front and in an inclined plane (upper, lower, left, right and diagonal directions) To an optical characteristic inspection method and an inspection apparatus of the image display panel.

The image display panel examines the surface optical characteristics such as color, brightness, and smudge to evaluate whether the product is defective or not. If the product does not achieve the desired quality at the design stage of the product, it is necessary to change the basic product design direction. If the product does not show the original intended color or brightness at the stage of mass production, a great economic loss occurs. I can not.

Particularly, as an inspection method of an image display panel, there are a method of using a known inspection apparatus and an intuitive (visual) method of an experienced inspector (engineer). However, the inspection apparatus developed so far depends on the mode of the liquid crystal and the structure of the image display panel such as the configuration of the polarizing plate, so that the accuracy is lowered so that the industry often still depends on the sense of a skilled engineer .

Inspector's intuitive method is to check the color, brightness, and stain on the front and various slopes (up, down, left, right and diagonal) of the image display panel by moving the position of the inspector. , And when it does not meet the criteria set by the product, it is treated as defective. However, information about the color, brightness, etc. recognized by the viewer through the viewer's viewpoint in one location is lost as time elapses while moving to another location, or information about the newly recognized color or luminance at another position is added, There is a drawback that it is easy to cause.

In recent years, as the image display panel is getting larger and higher quality, the distance that the inspector has to move is increased, so that the possibility that the inspector will forget information about the color and brightness obtained from the previous position is getting higher. In order to realize a clear and clean image quality Higher accuracy is required when testing. As a result, there is a limit to the conventional inspection method by intuition of the inspectors.

An object of the present invention is to provide a method of inspecting optical characteristics of an image display panel capable of comparing the optical characteristics of the front and the slope of the image display panel at one time without requiring the inspector to move the inspection position.

In the image display panel inspection according to the present invention, an image at the center of an image display panel is normally incident at an incident angle of 60 ° with respect to the normal direction and a directional angle with respect to the right horizontal direction at 0 °, 45 °, 90 °, 135 °, 180 °, It is an object of the present invention to provide an inspection method of an image display panel capable of comparing optical characteristics at 225 °, 270 ° and 315 ° at a time.

1. positioning an image display panel in front of a tester; Disposing one or more reflectors so that an angle with the image display panel is 108 to 120 占; And checking the optical characteristics of an image displayed on the reflector to determine whether or not the image is defective.

2. The inspection method of an image display panel as in 1 above, wherein the image display panel is positioned at the eye level of the inspector and the inspector can confirm the optical characteristic in the normal direction through the image display panel.

3. The inspection method for an image display panel according to item 1 above, wherein the reflectors are arranged in the upper and lower and left and right directions of the image display panel, respectively.

4. The inspection method for an image display panel according to item 1 above, wherein the reflectors are arranged in the vertical and horizontal directions and the diagonal direction of the image display panel, respectively.

5. The inspection method of an image display panel according to item 1 above, wherein the reflector is disposed at an angle of 110 DEG with the image display panel.

6. The image display apparatus according to claim 3, wherein the image of the central portion of the image display panel through the reflectors arranged in the upper and lower and left and right directions of the image display panel has an incident angle of 60 degrees with respect to the normal direction and a directional angle with respect to the right- 90 °, 180 °, and 270 ° at one time.

7. The image display apparatus according to claim 1, wherein the image of the central portion of the image display panel through the reflectors disposed in the diagonal direction from the upper and lower and left and right directions of the image display panel has an incident angle of 60 degrees with respect to the normal direction, Wherein the eight optical characteristics at 0 °, 45 °, 90 °, 135 °, 180 °, 225 °, 270 ° and 315 ° are compared at one time.

8. The inspection method of an image display panel as described in 1 above, wherein the optical characteristic confirmed by the inspector is color, brightness, and stain.

9. The image display panel of claim 1, wherein the image display panel is a liquid crystal display device.

10. A panel fixing unit on which an image display panel can be mounted; And at least one reflector coupled to an outer periphery of the panel fixing portion so as to have an angle of 108 to 120 degrees with the image display panel.

11. The image display panel inspection apparatus according to claim 10, wherein the reflectors are respectively coupled to the upper and lower and left and right directions of the panel fixing device.

12. The image display panel inspection apparatus of claim 10, wherein the reflectors are respectively coupled to the upper and lower and left and right directions of the panel fixing device in a diagonal direction.

13. The image display panel inspection apparatus of claim 10, wherein the reflector is combined with the image display panel by a joint part so that an angle between the reflector and the image display panel can be adjusted.

14. The image display panel inspection apparatus of claim 10, wherein the reflector is coupled to the panel fixing portion by a guard rail so as to be linearly movable.

15. The image display panel inspection apparatus of claim 10, wherein the image display panel is a liquid crystal display device.

The optical characteristic inspection method of the image display panel of the present invention does not require shifting the inspection position in order to determine whether the inspector is defective, so that it is possible to quickly and conveniently compare each optical characteristic.

Further, the inspection method of the present invention is excellent in accuracy because it does not compare the optical characteristics depending on the memory of the inspector.

In addition, considering that the image display panel is bad or not by a large number of engineers in the dark room, the inspection method of the present invention has an advantage of preventing a safety accident.

Further, since the image display panel is getting larger and higher in quality, the usefulness of the inspection method of the present invention can be more advantageously used in the future.

The present invention relates to a method of manufacturing an image display panel, Disposing a reflector so that the angle between the image display panel and the image display panel is in the range of 108 to 120 degrees; And checking the optical characteristics of the image appearing on the reflector to determine whether or not the optical characteristic of the image is defective. Thus, the optical characteristics (color, luminance, and brightness) of the image display panel in the front and the slope , Smearing, and the like) can be compared at one time, and the accuracy of inspection can be significantly improved.

Hereinafter, a method of inspecting an optical characteristic of an image display panel according to the present invention will be described step by step.

(1) positioning the image display panel on the front side of the inspector

The image display panel of the present invention includes a panel that can reproduce or form an image to obtain information through time. And specifically includes a large-sized image display panel such as a liquid crystal display (LCD), a plasma display (PDF), and an organic light emitting display (OLED), which are commonly used image display panels. In addition, the liquid crystal display device (LCD) includes a passive driving type LCD, an active driving type LCD, an LCD using a smectic liquid crystal type, and a PLCD using a polymer dispersive scattering mode. In the twisted nematic mode, , A surface switching mode, and the like.

The image display panel also includes an unfinished product that has been manufactured or laminated without adhering the components of the panel in order to confirm the optical characteristics of the image display panel in the manufacturing process.

The image display panel may include a backlight, a first polarizing plate, a liquid crystal cell, and a second polarizing plate, and the first and second polarizing plates may further include a protective film, a polarizer, and a retardation film.

Positioning the image display panel at the inspection position toward the front of the inspector is for allowing the inspector to confirm the optical characteristics of the normal direction of the screen (direction perpendicular to the screen). The inspector can observe the image display panel with the naked eye of the inspector or observe the image display panel using an image observer such as a manual or electronic imaging device. The image observer is installed on the front of the panel fixing part. Further, an image observation driver for adjusting the position and direction of the image observer can be coupled to the image observer. It is preferable that the image display panel is located at the eye height of the inspector even in the front direction.

The method of positioning the image display panel on the front side of the inspector is not particularly limited. For example, it is possible to directly fix the image display panel to a position where it can be fixed to a wall surface or a column, or to use a panel fixing portion on which an image display panel can be mounted. When the panel fixing unit is used, it is possible to move back and forth and up and down according to the height of the inspector (inspector's eyes, image observer), the distance to the inspector, the size of the image display panel, It is desirable to use available means.

(2) disposing one or more reflectors so that an angle with the image display panel is 108 to 120 占

The reflector is disposed so as to form a 108 to 120 DEG angle with the image display panel positioned on the front side of the inspector. The reflector may be disposed on all sides of the image display panel. The four sides of the image display panel include both the upper portion, the lower portion, the left portion, the right portion and the edge portion of the image display panel.

The reflector may be provided in a limited area in the area where the comparative inspection is required in the four sides of the image display panel. For example, when the upper and lower optical characteristics of the image display panel are required to be inspected, the reflector can be placed on the upper and lower portions of the image display panel. Also, in the case where inspection of the left and right is required, the reflector may be disposed on the left side portion and the right side portion, and in the case where inspection of the front and corner portions is required, a reflector may be disposed only on the corner portion.

The method of arranging the reflectors at the above angles is not particularly limited. In the simplest method, for example, it is possible to arrange reflectors of appropriate sizes in the upper and lower, left and right and diagonal directions of the image display panel as shown in Fig. The number of the reflectors to be disposed is not particularly limited, and one or more reflectors may be used. It is preferable to use an appropriate number of reflectors necessary to surround the image display panel. Only one reflector may be used if there is a specially designed reflector for the present invention.

The reflector may be fixed, but it may be designed to move as needed. When the reflector is fixed, it may be fixed to a frame, a holder, or the like, into which the image display panel can be inserted. A means (a rectilinear motion means of the reflector) such as a guardrail for allowing the reflector to approach the image display panel when the reflector is designed to move, a joint portion for adjusting the angle between the image display panel and the reflector Adjustment means). The reflectors surrounding the image display panel can uniformly determine the distance to the image display panel, the moving direction, the moving speed, and the angle with the image display panel by an apparatus including an electronic control system or a gear device.

The size of the reflector is not particularly limited, but must be appropriately adjusted in consideration of the size of the image display panel, the size of the adjacent reflector, the angle between the image display panel and the reflector, and the like. Particularly, the upper and lower and left and right reflectors of the image display panel preferably have appropriate sizes so that the reflector disposed at the corner portion of the image display panel can exhibit an appropriate function.

The fact that the reflector and the image display panel are arranged to form the angle of 108 to 120 is considered that the light leakage phenomenon is most conspicuous when the central portion of the image display panel in the black state has an incident angle of 60 degrees with respect to the normal direction. Specifically, when the light having an incident angle of 60 ° is directed to an observer located at an infinite distance, the angle formed with the reflector is 120 ° as shown in FIG. 2, and the observer views the image display panel on the front and the light having an incident angle of 60 ° Since the visual perception of the eye is about 45 °, when it is considered, it becomes 108 ° as shown in FIG. Therefore, in consideration of the above, it is preferable to arrange the reflector so as to form 108 to 120 degrees with the image display panel for the optical characteristic inspection.

(3) determining the optical characteristics of the liquid crystal displayed on the reflector to determine whether the liquid crystal is defective

It is possible to observe and compare at once the hue, brightness, unevenness and the like which can be observed while changing the conventional position through the reflector disposed in the image display panel. It is possible to judge whether or not the optical characteristics reflected by the reflector are inferior according to the evaluation criteria of the product (depending on the application, the mode of the liquid crystal mode, and the requirements of the customer).

For example, when the reflector is arranged at 110 degrees with the image display panel and arranged in the vertical and horizontal directions, the image at the center of the image display panel through the reflectors arranged in the vertical and horizontal directions has an incident angle of 60 degrees with respect to the normal direction, The four optical characteristics at 0 deg., 90 deg., 180 deg., And 270 deg., Respectively, in the horizontal direction can be compared at one time. The image of the central portion of the image display panel through the reflectors arranged in the diagonal direction with respect to the vertical and horizontal directions of the image display panel has an incident angle of 60 degrees with respect to the normal direction and a directional angle with respect to the right horizontal direction of 0 degree and 45 degrees , 90 °, 135 °, 180 °, 225 °, 270 ° and 315 ° can be compared at one time.

For example, whether or not the image display panel shows symmetry can be determined by comparing the hue and luminance of the left reflector and the right reflector. In addition, it is possible to determine whether the image display panel is defective by comparing the difference in color and luminance between the left reflector and the upper reflector, and the difference in color and luminance between the right reflector and the upper reflector. In addition, it is possible to judge whether or not the image display panel is defective by comparing the hue and brightness of the front face, which can be directly confirmed without the aid of the reflector, and the hue and brightness of the slope confirmed by the reflector.

An apparatus for inspecting an optical characteristic of an image display panel according to the present invention will now be described.

The image display panel inspection apparatus includes a panel fixing section (40) on which the image display panel (10) can be mounted; And one or more reflectors (20 to 23 and 30 to 33) coupled to the outside of the panel fixing portion so as to form an angle of 108 to 120 degrees with the image display panel.

The inspection apparatus of the image display panel may include a reflector and a joint portion coupled to the image display panel to adjust the angle formed by the reflector and the image display panel. Also, the reflector is coupled to the panel fixing portion so as to be linearly movable by the guard rail. The reflector may be provided with an electronic control system or a gear device which is coupled to the guard rail and can uniformly determine the distance to the image display panel, the moving direction, the moving speed, and the angle with the image display panel.

The reflector, the joint part, the guard rail, the electronic control system, and the gear device may be combined and provided by a common method used in the art, and there is no particular limitation thereto.

Hereinafter, the present invention will be described in more detail with reference to Examples. The following examples are only illustrative of the present invention and are not intended to limit the scope of the present invention.

Example

I Plus Pol (Dongwoo Fine-Chem Co., Ltd., Korea), a polarizing plate for 42 "IPS mode manufactured, was laminated on both sides of an IPS Panel (LGD, Korea) and an image display panel was prepared so that the symmetry could not be maintained. Five engineers who have performed image display panel inspection for more than five years were selected.

First, a fixing plate having a width of 3 m and a height of 3 m was provided on the wall surface of the dark room, and the image display panel 10 was positioned so as to be perpendicular to the paper surface at the center portion (height: 1.6 m from the ground) of the fixing plate. Guard rails 50 to 57 are provided in the upper, lower, left and right and diagonal directions of the image display panel so that the eight reflectors 20 to 23 and 30 to 33 are moved toward the image display panel by the switch, I was able to exercise. The eight reflectors are coupled by an articulating device and designed to adjust the angle with the image display panel. In this embodiment, the angle between all the reflectors and the image display panel is set to 110 degrees.

The reflectors used in this embodiment were 1000 mm long and 500 mm long.

After the preparations were completed as described above, (1) the reflectors were not located in the vicinity of the image display panel, the five engineers moved their positions as before to judge whether the image display panel was defective or not, and (2) In accordance with the inventive method, eight optical characteristics were observed and compared through a reflector at a time, and then it was judged whether or not the image display panel was defective (FIGS. 4 and 5).

As a result, in case (1), 2 of 5 engineers gave bad opinions, 3 gave good opinions, and in case of (2), all five engineers judged to be defective. Accordingly, it is confirmed that the present invention is effective.

Fig. 1 is an example of an image display panel tester in which reflectors are arranged in four directions according to the present invention, wherein (a) is a perspective view and (b) is a front view.

2 is an angle of incidence of the reflector in consideration of an observer and an angle of incidence where the central portion of the image display panel is 60 ° with respect to the normal direction in the black state according to the present invention.

3 is an arrangement angle of a reflector in a black state in consideration of an incident angle at a central portion of an image display panel of 60 degrees with respect to a normal direction and a time at which light is recognized (45 degrees) in a black state according to the present invention.

4 shows an image display panel in which reflectors are arranged in the up and down, right and left and diagonal directions of the embodiment according to the present invention.

Fig. 5 shows an image formed on the reflectors arranged in the top, bottom, left and right and diagonal directions of the image display panel in the embodiment.

DESCRIPTION OF THE REFERENCE NUMERALS

10: Image display panel

20 to 23 and 30 to 33: reflector

40:

50 to 57: guard rail

Claims (15)

Positioning the image display panel at the eye level of the tester; Disposing 4 to 8 reflectors so that the angle with the image display panel is 108 to 120 占; And And checking the optical characteristics of the image displayed on the reflector to determine whether the image is defective. The inspection method of an image display panel according to claim 1, wherein the image display panel is positioned at the eye level of the inspector and the inspector can confirm the optical characteristic in the normal direction through the image display panel. The inspection method of an image display panel according to claim 1, wherein the reflectors are arranged in the upper and lower and left and right directions of the image display panel, respectively. The inspection method of an image display panel according to claim 1, wherein the reflectors are arranged in the vertical and horizontal directions and the diagonal direction of the image display panel, respectively. The inspection method of an image display panel according to claim 1, wherein the reflector is disposed at an angle of 110 ° with the image display panel. 4. The image display apparatus according to claim 3, wherein the image of the central portion of the image display panel through the reflectors arranged in the upper and lower and left and right directions of the image display panel has an incident angle of 60 degrees with respect to the normal direction and a directional angle with respect to the right- , 180 ° and 270 ° are compared at one time. 5. The image display device according to claim 4, wherein the image of the center of the image display panel through the reflectors arranged in the diagonal direction from the top and bottom and left and right directions of the image display panel has an incident angle of 60 degrees with respect to the normal direction and a direction angle with respect to the right- , 45 °, 90 °, 135 °, 180 °, 225 °, 270 ° and 315 ° are compared at one time. The inspection method of an image display panel according to claim 1, wherein the optical characteristic confirmed by the inspector is color, brightness, and smudge. The inspection method of an image display panel according to claim 1, wherein the image display panel is a liquid crystal display device. A panel fixing part on which the image display panel can be mounted; And And four to eight reflectors coupled to an outer periphery of the panel fixing portion so as to form an angle of 108 to 120 degrees with the image display panel. 11. The image display panel inspection apparatus according to claim 10, wherein the reflectors are respectively coupled to the upper and lower and left and right directions of the panel fixing device. 11. The image display panel inspection apparatus according to claim 10, wherein the reflector is coupled to the upper and lower and left and right directions of the panel fixing device in a diagonal direction, respectively. The image display panel inspection apparatus according to claim 10, wherein the reflector is combined with the image display panel by a joint part so that an angle between the reflector and the image display panel can be adjusted. The image display panel inspection apparatus according to claim 10, wherein the reflector is coupled to the panel fixing portion by a guard rail so as to be linearly movable. The image display panel inspection apparatus according to claim 10, wherein the image display panel is a liquid crystal display device.

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