Inspection jig for display device and inspection method for display device

Abstract

To improve reliability of an inspection jig for an inspection device and an inspection method for the display device.SOLUTION: An inspection jig for an inspection device includes a placement part 4 capable of placing a liquid crystal display device 1, and mirrors 2 and 3 that, when a screen 1a of the liquid crystal display device 1 placed on the placement part 4 is viewed from a front side, do not overlap with the screen 1a. The inspection jig for the display device is used in the following manner: mirror surfaces 2a and 3a of the mirrors 2 and 3 are oriented at an angle θ with respect to a perpendicular line 1c, such that they reflect, among components of light emitted from the screen 1a, a second component emitted from the screen 1a at an angle different from that of a first component emitted along the perpendicular line 1c with respect to the screen 1a in the same direction as the direction in which the first component is emitted, and the angle θ is greater than 0 degrees and not more than 45 degrees.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an inspection jig for a display device and a method for inspecting a display device. [Background technology]

[0002] In the manufacturing process of liquid crystal display devices, inspections to detect the presence of foreign matter and various defects are generally carried out after the manufacture of the array substrate or the liquid crystal display panel, etc. In liquid crystal display panels, the presence or absence of color mixing, a defect in which the light of a pixel to be displayed mixes with the color of an adjacent pixel, is inspected by an operator facing the liquid crystal display panel from a different viewing angle.

[0003] Patent Document 1 (JP 2015-7575 A) describes a method of transmitting light from a backlight unit through a rotatably supported liquid crystal display panel, and visually inspecting the transmitted light to check for foreign matter, scratches, color unevenness, and other defects. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-7575 Summary of the Invention [Problem to be solved by the invention]

[0005] When color mixing occurs, the symptom becomes more noticeable when the viewing angle of the LCD panel exceeds a certain angle. Therefore, when inspecting for color mixing, it is important to check the color from an accurate viewing angle. However, when inspecting by a person using head-swivel testing, the viewing angle cannot be changed stably, making it difficult to perform a strict inspection.

[0006] Furthermore, when performing a head swing test, it is not possible to simultaneously compare the color of the displayed image when the LCD display panel is viewed from the front, i.e., the normal color, with the color of the displayed image after the viewing angle is changed, i.e., the color that may be a result of color mixing, which can lead to overlooking color mixing and misjudging the degree of color mixing.

[0007] An object of the present invention is to improve the reliability of a display device inspection jig and a display device inspection method.

[0008] Other objects and novel features will become apparent from the description of this specification and the accompanying drawings. [Means for solving the problem]

[0009] A brief summary of a representative embodiment of the present invention will be given below.

[0010] One embodiment of a display device jig comprises a mounting portion on which a display device can be placed, and a mirror positioned so as not to overlap the screen when the screen of the display device placed on the mounting portion is viewed from the front, the mirror surface of the mirror having an angle θ with respect to the perpendicular line so as to reflect a second component of the light emitted from the screen, which is emitted at an angle different from a first component emitted along a perpendicular line to the screen, in the same direction as the first component is emitted, the angle θ being greater than 0 degrees and less than or equal to 45 degrees.

[0011] One embodiment of a method for inspecting a display device includes the steps of: (a) placing the display device on a mounting portion; and (b) having an observer visually inspect the image displayed on the screen of the display device as reflected in a mirror positioned adjacent to the screen from the observer's perspective, with the observer's viewpoint positioned directly in front of the screen. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a schematic diagram showing a jig for a display device according to an embodiment. [Figure 2]10A and 10B are schematic diagrams showing an aspect of an inspection performed using a jig for a display device according to an embodiment. [Figure 3] 10 is a schematic diagram showing an example of a mounting portion constituting a jig for a display device according to a first modified example of the embodiment. FIG. [Figure 4] FIG. 10 is a perspective view showing an example of a mounting portion constituting a jig for a display device according to a first modified example of the embodiment. [Figure 5] 10 is a schematic diagram showing an aspect of an inspection performed using a jig of a display device according to a second modified example of the embodiment. FIG. [Figure 6] FIG. 10 is a schematic diagram showing a jig for a display device according to a third modification of the embodiment. [Figure 7] FIG. 10 is a schematic diagram showing a jig for a display device according to a fourth modified example of the embodiment. [Figure 8] FIG. 13 is a schematic diagram showing a jig for a display device according to a fifth modified example of the embodiment. [Figure 9] FIG. 13 is a schematic diagram showing an aspect of an inspection performed using a jig for a display device according to a fifth modified example of the embodiment. [Figure 10] FIG. 2 is a schematic diagram showing a jig for a display device according to an embodiment. [Figure 11] 1 is a cross-sectional view illustrating the principle of color mixing in a display device. [Figure 12] 1 is a cross-sectional view illustrating the principle of color mixing in a display device. [Figure 13] 10A and 10B are schematic diagrams illustrating a method for inspecting a display device according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, each embodiment of the present invention will be described with reference to the drawings. The disclosure is merely an example, and appropriate modifications that a person skilled in the art can easily conceive while maintaining the gist of the invention are naturally included within the scope of the present invention. Furthermore, in order to clarify the explanation, the drawings may show the width, thickness, shape, etc. of each part schematically compared to the actual embodiment. However, these are merely examples and are not intended to limit the interpretation of the present invention. Furthermore, in this specification and each drawing, elements similar to those described above with reference to the previous drawings may be designated by the same or related reference numerals, and detailed descriptions may be omitted as appropriate.

[0014] The planar shape in this application refers to the shape of an object in a planar view. The planar view here refers to the positional relationship when the object is viewed from a direction perpendicular to a principal surface, which is a particularly large surface of the object.

[0015] <Details of areas for improvement> The following describes room for technical improvement in the inspection jig for a display device and the inspection method for a display device.

[0016] 11 and 12 are cross-sectional views of a liquid crystal display device. FIG. 11 shows a state where there is no assembly misalignment between the array substrate and the color filter substrate. FIG. 12 shows a state where there is assembly misalignment between the array substrate and the color filter substrate. As shown in FIG. 11, the liquid crystal display device has a structure in which an array substrate and a color filter substrate are arranged opposite each other, with a liquid crystal layer 27 provided between them. The array substrate has a transparent layer 22 provided on a glass substrate 21, and a plurality of light shielding bodies 23 arranged on the transparent layer 22. The light shielding bodies 23 are made of, for example, a metal film. Although not shown, the array substrate has TFTs (Thin Film Transistors) arranged in an array on or below the transparent layer 22, and pixel electrodes connected to the TFTs and common electrodes facing the pixel electrodes are formed thereon.

[0017] The color filter substrate is provided on a glass substrate 24 (lower side in FIG. 11 ), with a plurality of black matrices 25 arranged in a line along the surface of the glass substrate 24, and a plurality of color filters 26r, 26g, and 26b arranged along the surface. The color filter 26r transmits light passing through it as red light. The color filter 26g transmits light passing through it as green light. The color filter 26b transmits light passing through it as blue light. The screen (liquid crystal display panel) of the liquid crystal display device has red, green, and blue color filters 26r, 26g, and 26b arranged in a repeated line, and each of the color filters 26r, 26g, and 26b constitutes one pixel. The liquid crystal display panel has such pixels arranged, for example, in a matrix.

[0018] The black matrix (BM) 25 is provided to prevent color mixing between adjacent pixels, and in a plan view, the boundaries of each color filter are separated in a grid pattern by the black matrix 25. The black matrix 25 also serves to prevent light from leaking from the screen when black is displayed.

[0019] Here, the black matrix 25 and the light shielding body 23 are arranged to overlap each other. A viewer can recognize the image displayed on the liquid crystal display panel and its color by sensing light passing from the glass substrate 21 side through the liquid crystal layer 27 and the color filters 26r, 26g, or 26b to the glass substrate 24 side. The dashed arrow in FIG. 11 indicates transmitted light 28 that passes through the color filter 26r to display the pixel in red. There is also transmitted light 29 (light indicated by a dashed-dotted arrow in FIG. 11) that passes directly below the color filter 26r and is transmitted through the liquid crystal layer 27 from the glass substrate 21 side at an angle different from that of the transmitted light 28. Such transmitted light 29 is blocked by the light shielding body 23 or the black matrix 25, so the viewer does not perceive the transmitted light 29.

[0020] However, as shown in Figure 12, if there is an assembly misalignment (misalignment) between the array substrate and the color filter substrate when they are bonded together, transmitted light 29 may pass through color filter 26r and another color filter 26g or 26b adjacent to them and be perceived by the viewer. In Figure 12, transmitted light 29 passes through blue color filter 26b, so the blue color of color filter 26b adjacent to color filter 26r is unintentionally displayed, resulting in color mixing. In other words, in this case, light from a blue pixel, which is a component of a different pixel, is added to a pixel controlled to display red, and the viewer perceives a purple display.

[0021] One method for inspecting for the occurrence of color mixing is a head-swivel test performed by an observer. As shown as a comparative example in FIG. 13, the head-swivel test is an inspection in which an observer looks at a screen (liquid crystal display panel) 35a of a liquid crystal display device 35 from the front, and then changes the angle (visual angle) from which the observer views the screen 35a to check the display on the screen 35a. FIG. 13 shows the observer's viewpoint 36. In the head-swivel test, a single color is displayed on the entire screen 35a to be inspected, and the screen 35a is viewed from different angles to inspect for the occurrence of color mixing. In the head-swivel test, the observer performs the visual inspection from a position about 30 cm away from the screen, for example.

[0022] Here, the visual inspection is performed by changing the visual angle within a range of 45 degrees from a state where the visual angle with respect to the screen 35a is 0 degrees, i.e., a state where the observer faces the screen 35a directly. In this case, rather than performing the inspection while continuously changing the visual angle, the observer moves the viewpoint to a predetermined angle, such as 15 degrees or 30 degrees, and the presence or absence of color mixing and the degree of color mixing are inspected. If color mixing occurs at a visual angle of, for example, 30 degrees, a different color is observed compared to the color of the displayed image when the observer observes it at a visual angle of 0 degrees, because other colors are mixed into the displayed image.

[0023] Here, when changing the visual angle, for example, from 0 degrees to 30 degrees, the observer must move in a manner that changes the position of their face. However, the visual angles of multiple observers tend to vary, and it is difficult to maintain a constant visual angle for each test, even for the same person. In other words, when the visual angle is changed depending on the person's head movement, there is room for improvement in the first area: the visual angle is not stable.

[0024] Furthermore, the presence or absence of color mixing is determined by the observer comparing the difference between the color of the screen viewed at a viewing angle of 0 degrees and the color of the screen viewed at, say, a viewing angle of 30 degrees. However, with a head-swivel test, it is not possible to simultaneously compare the screen at a viewing angle of 0 degrees with the screen at, say, a viewing angle of 30 degrees, so the observer must rely on their memory to make the judgment. As a result, color mixing may be overlooked. Furthermore, the chromaticity level (degree of color mixing) of the color mixing cannot be determined, and the judgment is prone to variability. This leaves room for a second improvement: it is not possible to maintain stable inspection quality.

[0025] Therefore, in the following embodiment, a device is implemented to solve the first and second room for improvement described above. The technical concept of this embodiment that implements this device will be described below.

[0026] (Embodiment) <Aspects of the display device inspection jig> Figure 1 shows an inspection jig for a display device according to this embodiment. Unless otherwise specified, the term "inspection" hereinafter refers to an inspection (color mixing inspection) that checks for the presence or absence of color mixing and the degree of color mixing. The inspection jig of this embodiment includes a mounting section 4 on which a liquid crystal display device 1 can be placed, as well as mirrors 2 and 3. The mounting section 4 is, for example, the horizontal surface of a top plate, and in this case, the thin liquid crystal display device 1 is placed on the mounting section 4 with its screen 1a facing upward.

[0027] The liquid crystal display device 1 has a screen 1a and a back surface 1b opposite to the screen 1a. The mirrors 2 and 3 are each arranged at a distance from the liquid crystal display device 1 placed on the mounting portion 4, on the screen 1a side rather than on the back surface 1b side of the liquid crystal display device 1. The mirrors 2 and 3 are arranged at positions sandwiching the screen 1a when the screen 1a is viewed along a perpendicular line 1c to the screen 1a (when the screen 1a is viewed from the front). As shown in FIG. 1, the screen 1a is a surface extending along the X and Y directions, and the perpendicular line 1c extends along the Z direction. The X, Y, and Z directions are perpendicular to each other.

[0028] Each of mirrors 2 and 3 is tilted at a predetermined angle θ with respect to a perpendicular line 1c of screen 1a of liquid crystal display device 1, with the end of each mirror 2 and 3 on the liquid crystal display device 1 side (the mounting portion side) as a fulcrum. In other words, each of mirrors 2 and 3 is tilted at a predetermined angle θ with respect to a plane perpendicular to screen 1a of liquid crystal display device 1. Mirror 2 has a mirror surface (reflective surface) 2a, and mirror 3 has a mirror surface (reflective surface) 3a, and these mirror surfaces 2a and 3a face an area located on perpendicular line 1c of screen 1a. Each of mirror surfaces 2a and 3a is tilted so that the farther away from liquid crystal display device 1 and the mounting portion it is, the farther it is from the area located on perpendicular line 1c of screen 1a.

[0029] Mirrors 2 and 3 do not overlap with screen 1a in the direction along perpendicular line 1c to screen 1a (Z direction). In other words, mirrors 2 and 3 are arranged so as not to overlap with screen 1a when screen 1a is viewed along perpendicular line 1c. In other words, mirrors 2 and 3 are adjacent to or spaced apart from screen 1a in the direction along screen 1a (X direction). The screen 1a, mirrors 2 and 3, and mirror surfaces 2a and 3a of liquid crystal display device 1 each have a rectangular planar shape. In a planar view of screen 1a, one side of one end of screen 1a in the X direction is parallel to one side of mirror 2, and the other side of screen 1a in the X direction is parallel to one side of mirror 3.

[0030] The angle θ at which each of the mirrors 2 and 3 is tilted with respect to the perpendicular line 1c of the screen 1a of the liquid crystal display device 1 is, for example, 30 degrees in this example. The angle θ is, for example, greater than 0 degrees and equal to or less than 45 degrees. It is desirable that the angle θ of each of the mirrors 2 and 3 can be changed and fixed as appropriate.

[0031] <Display device inspection method> Fig. 2 shows an inspection jig for a display device according to this embodiment. The mounting portion 4 is not shown in Fig. 2. Fig. 2 shows the liquid crystal display device 1 (screen 1a) and the inspection jig when the screen 1a of the liquid crystal display device 1 is viewed from the front.

[0032] In the inspection, first, the liquid crystal display device 1 is placed on the placement section 4 .

[0033] Next, with the observer's viewpoint positioned directly in front of the screen 1a of the liquid crystal display device 1, the observer visually checks the image displayed on the screen 1a reflected on the mirrors 2 and 3 that are placed adjacent to the screen 1a as seen from the observer's perspective. The observer compares the image displayed on the lit screen 1a with the image displayed on the mirrors 2 and 3 to check for the presence or absence of color mixing and the degree (level) of color mixing.

[0034] The mirrors 2 and 3 are used to view the screen 1a of the liquid crystal display device 1 from an oblique angle θ rather than from the front when inspecting for color mixing in the liquid crystal display device 1. The color mixing inspection of the liquid crystal display device 1 is performed, for example, in the final stage of the manufacturing process when a backlight is provided on the back side of the liquid crystal panel that constitutes the liquid crystal display device, and the module is almost completed using this. The inspection is performed with the backlight provided in the liquid crystal display device 1 turned on. When performing the inspection, the observer views the screen 1a from the front along the Z direction. In other words, the observer looks at the screen 1a straight on. At this time, by looking at the mirrors 2 and 3, the observer can see an image (virtual image) of the screen 1a reflected by the mirror surfaces 2a and 3a of the mirrors 2 and 3.

[0035] That is, the mirror surfaces 2a and 3a of the two mirrors 2 and 3, respectively, reflect the second component of the light emitted from the screen 1a, which is emitted at a different angle from the first component emitted along the perpendicular line 1c, in the same direction (Z direction) as the direction in which the first component is emitted (Z direction). For this reason, the mirror surfaces 2a and 3a are inclined at an angle θ with respect to the perpendicular line 1c. The direction in which the first and second components are emitted here is not the direction from the screen 1a toward the back surface 1b of the liquid crystal display device 1, but the direction starting from the screen 1a and moving away from the liquid crystal display device 1.

[0036] The observer can view the image of screen 1a reflected by mirrors 2 and 3 without moving their viewpoint (face position) from a position (viewpoint 36) where they view screen 1a head-on. In other words, the color mixing test can be performed at an oblique visual angle from the same viewpoint 36 without having to perform a head-turning test. Note that three viewpoints 36 are shown in FIG. 1, but this indicates that light beams traveling from screen 1a and mirror surfaces 2a and 3a toward the observer along perpendicular line 1c can be viewed from the same viewpoint 36, and these lights can be viewed simultaneously without moving the viewpoint. In this case, by looking at screen 1a reflected by mirrors 2 and 3, the observer can confirm screen 1a as viewed from angle θ relative to perpendicular line 1c of screen 1a of the liquid crystal display device 1.

[0037] When color mixing occurs, even if the observer does not see the color mixture on screen 1a when viewing from the front, the color mixture can be seen on screen 1a reflected by mirror surface 2a or 3a. Figure 2 shows color mixture portion 2b reflected on mirror surface 2a and color mixture portion 3b reflected on mirror surface 3a. For example, if red is displayed on the entire screen 1a when viewed from the front, color mixture portion 2b may display purple as a result of red being mixed with blue, and color mixture portion 3b may display orange as a result of red being mixed with green. Color mixing does not necessarily occur on the entire screen 1a; as shown in Figure 2, color mixing may occur in only a portion of screen 1a.

[0038] A liquid crystal display device in which no color mixing is found in the inspection is determined to be a good product. A liquid crystal display device in which color mixing is found in the inspection is determined to be a defective product. A liquid crystal display device in which color mixing is found is determined to be a defective product depending on the degree of color mixing or the viewing angle at which color mixing is found.

[0039] Furthermore, the quality evaluation of a liquid crystal display device in which color mixing is confirmed may be changed (sorted) as a lower grade than the quality evaluation of a liquid crystal display device in which color mixing is not confirmed.

[0040] <Effects of this embodiment> In this embodiment, the observer can view the image of the screen 1a reflected by the mirrors 2 and 3 from a position directly facing the screen 1a of the liquid crystal display device 1 without moving their viewpoint. Therefore, color mixing inspection can be performed at an oblique viewing angle from the same viewing point 36 without the need for a head-swiveling inspection. In other words, the color of a normal screen without color mixing can be easily compared with the color of an image at a viewing angle where color mixing has occurred. This prevents variations in the viewing angle during inspection between multiple observers. Furthermore, even when the same person performs the inspection, the viewing angle can be kept constant for each inspection. This stabilizes the viewing angle during color mixing inspection, eliminating the first room for improvement described above. This improves the reliability of the display device inspection jig and the display device inspection method.

[0041] Furthermore, the image displayed on screen 1a of liquid crystal display device 1 can be viewed from directly in front of screen 1a, and the image displayed on screen 1a reflected on mirror 2 or 3 adjacent to screen 1a can be viewed. In other words, the observer can compare the displayed images almost simultaneously without turning their head. This allows them to check slight color differences between the two displayed images, preventing oversight of color mixing, and furthermore, makes it easier to determine the degree of color mixing (chromaticity level) compared to a head-turning test. This eliminates the second room for improvement, which is the inability to maintain stable test quality.

[0042] Although the case where a pair (two) of mirrors are provided in the inspection device has been described here, the number of mirrors may be one, or three or more. When there is only one mirror, it is preferable that the mounting unit 4 is configured so that the liquid crystal display device 1 can be rotated around the axis of the perpendicular line 1c of the screen 1a, since this makes it easier to inspect for color mixing from multiple angles.

[0043] 2 shows a state in which the virtual image of screen 1a is reflected entirely on each of mirror surfaces 2a and 3a, and the four sides of the virtual image of screen 1a match the four sides of the rectangular mirror surfaces 2a and 3a. In reality, however, as shown in FIG. 10, the shape of screen 1a reflected on each of mirror surfaces 2a and 3a does not match the shape of the rectangular mirror surfaces 2a and 3a.

[0044] <Variation 1> 3 and 4 show an example of the placement section.

[0045] Instead of the mounting portion 4 as shown in FIG. 1, for example, two holders 4a as shown in FIG. 3 may be used as the mounting portion. One or both of the two holders 4a can move toward each other. For example, the two holders 4a are biased toward each other using a spring or the like. Alternatively, one of the two holders 4a can be fixed using, for example, a screw while applying stress to move it toward the other holder 4a. In these cases, the two holders 4a hold (fix, mount) the liquid crystal display device 1 by sandwiching both ends of the liquid crystal display device 1. In this case, the liquid crystal display device 1 may be mounted so that the screen 1a is horizontal, or so that the screen 1a is perpendicular to a horizontal plane.

[0046] Alternatively, the mounting portion 4b shown in FIG. 4 may be used as the mounting portion. The mounting portion 4b includes holding portions 4c that respectively hold two sides of the liquid crystal display device 1 at both ends in a plan view, and a connecting portion 4d that connects the holding portions 4c to each other. Each of the two holding portions 4c extends along both ends of the liquid crystal display device 1 to be mounted, and one end of the holding portion 4c in the extending direction is connected to the connecting portion 4d that extends perpendicular to the extending direction. The holding portion 4c covers the edge of the front surface of the liquid crystal display device 1 (the surface facing the screen 1a), the side surface of the liquid crystal display device 1, and the edge of the back surface of the liquid crystal display device 1. In this case, the liquid crystal display device 1 may be mounted with the screen 1a horizontal, or may be mounted on the connecting portion 4d with the screen 1a standing perpendicular to the horizontal plane.

[0047] <Variation 2> 5, colors that may be displayed when color mixture occurs may be displayed in part of the screen 1a of the liquid crystal display device 1. That is, color comparison images 6 and 7 may be displayed in two corners of the screen 1a. The color comparison images 6 and 7 may also be called color sample images, reference color images, or abnormal color images.

[0048] Color comparison image 6 is, for example, a portion displaying a color (the color of color mixing portion 2b) that may be displayed when color mixing occurs on mirror surface 2a of mirror 2. For example, if a solid red color is displayed over most of the image on screen 1a, including the center, the color of color comparison image 6 is purple. A color comparison image 6a corresponding to color comparison image 6 is confirmed in the virtual image of mirror 2, and a color comparison image 6b corresponding to color comparison image 6 is confirmed in the virtual image of mirror 3.

[0049] Color comparison image 7 is, for example, a portion that displays a color (the color of color mixing portion 3b) that may be displayed when color mixing occurs on mirror surface 3a of mirror 3. For example, if a solid red color is displayed in most of the display image on screen 1a, including the center, the color of color comparison image 7 is orange. A color comparison image 7a corresponding to color comparison image 7 is confirmed in the virtual image of mirror 3, and a color comparison image 7b corresponding to color comparison image 7 is confirmed in the virtual image of mirror 3.

[0050] During the inspection, the observer can accurately determine the degree of color mixing by comparing the color of color comparison image 6a reflected on mirror 2 with the color of color mixture portion 2b. Similarly, the observer can accurately determine the degree of color mixing by comparing the color of color comparison image 7b reflected on mirror 3 with the color of color mixture portion 3b.

[0051] Each of the color comparison images 6 and 7 may be a single color, or may be a gradation representing multiple levels of different chromaticity. The observer can more accurately determine the degree of color mixing by comparing, for example, which chromaticity level of the color comparison image 6a the color of the color mixture portion 2b is closest to.

[0052] <Variation 3> As shown in Fig. 6, the inspection jig may include a housing 8, and the mounting portion 4 and the mirrors 2 and 3 may be disposed inside the housing 8. The housing 8 has walls surrounding the mounting portion 4 and the mirrors 2 and 3, and further includes an opening 8a that can fix the viewpoint of an observer 37 on the front side of the screen 1a of the liquid crystal display device 1 that is mounted on the mounting portion 4. The opening 8a shown in Fig. 6 is designed to fit the entire face of the observer 37, and allows the viewpoint of the observer 37 to be fixed.

[0053] In this modification, by fitting the face of the observer 37 into the opening 8a, the line of sight can be fixed, preventing changes in the viewpoint due to individual differences. In addition, by making the inside of the housing 8 dark, stable examination can be performed regardless of the surrounding brightness.

[0054] The opening 8a may be the same size as the eye of the observer 37, and may be the minimum size necessary for the observer 37 to view the inside of the housing 8. By reducing the size (opening area) of the opening 8a, it becomes possible to fix the viewpoint more precisely, and changes in viewpoint due to individual differences can be prevented.

[0055] <Variation 4> 7, the inspection jig may include an optical lens 9 that can be inserted into or removed from a region between the opening 8a (observer 37) and the screen 1a of the liquid crystal display device 1 placed on the placement portion 4. In other words, the inspection jig may include an optical lens 9 that can be inserted into or removed from a position that overlaps with the screen 1a when viewed from the front.

[0056] This optical lens 9 is not used in color mixing inspection. Therefore, color mixing inspection is performed with the optical lens 9 removed (pulled out) from the area. The optical lens 9 is used when performing inspections other than color mixing inspection, such as inspections to check for point defects, display unevenness, or black spots that can be seen when the liquid crystal display device 1 is turned on. When performing these inspections that are different from color mixing inspection, inserting the optical lens 9 into the area and performing the inspection enables more detailed inspection.

[0057] In this modified example, the inspection device is provided with an optical lens 9 that can be inserted into and removed from the area between the observer 37 and the optical lens 9. This eliminates the need to use separate devices to perform color mixing inspection and other inspections, making various inspections easier.

[0058] The optical lens 9 can be used even without the housing 8. By being able to insert and remove the optical lens 9 into the relevant area inside the housing 8, stable inspection is possible regardless of the ambient brightness. Furthermore, a movable light source may be provided inside a dark housing. By moving the light source while illuminating the screen 1a, it is possible to illuminate the screen 1a from various angles and perform the various inspections described above, or to inspect the screen 1a for scratches.

[0059] <Variation 5> As shown in FIG. 8, a double-sided mirror 10 having a mirror surface (reflective surface) 10a on one main surface and a mirror surface (reflective surface) 10b on the other main surface opposite the mirror surface may be placed vertically on the screen 1a of a liquid crystal display device 1 placed on a mounting portion 4 to perform a color mixing test.

[0060] Here, a thin, plate-shaped double-sided mirror 10 is placed above the screen 1a so that its mirror surfaces 10a and 10b are perpendicular to the screen 1a. The double-sided mirror 10 is set up, for example, directly above the center of the screen 1a in the X direction. In other words, when the screen 1a of the liquid crystal display device 1 placed on the mounting section 4 is viewed from the front, the double-sided mirror 10 is placed in a position that overlaps with the screen 1a, and has mirror surfaces 10a and 10b that extend along a direction perpendicular to the screen 1a (perpendicular line 1c).

[0061] In the color mixing inspection of this modified example, the observer moves the viewpoint (changes the visual angle), i.e., swivels. The swivel angle θ (the angle at which the observer views, the visual angle) relative to the perpendicular line 1c to the screen 1a is, for example, greater than 0 degrees and less than 45 degrees. In the color mixing inspection, the observer not only views the screen 1a from a frontal viewpoint 36, but also from viewpoints 36a and 36b tilted by the visual angle θ, viewing the screen 1a and a virtual image of the screen 1a reflected in the double-sided mirror 10. Note that the inspection jig of this modified example may also include a housing 8 or a removable optical lens 9, as in modified examples 3 and 4. Since this modified example performs a swivel inspection, if the inspection jig has a housing 8, it is possible to provide a wide opening 8a or multiple openings 8a depending on the visual angle.

[0062] For example, when viewed from viewpoint 36b, as shown in FIG. 9, the liquid crystal display device 1 and screen 1a (real image) and the virtual image of screen 1a reflected on mirror surface 10b of double-sided mirror 10 are visible. When color mixing occurs, color mixing portion 3b is visible in the real image of liquid crystal display device 1 and screen 1a, and color mixing portion 2b is visible in the screen 1a reflected on mirror surface 10b. In this case, if the display color of the area of ​​image 1a where color mixing does not occur is red, color mixing portion 3b is considered to be orange and color mixing portion 2b is considered to be purple. When viewing the real image of screen 1a from viewpoint 36b and when viewing the virtual image of screen 1a reflected on mirror surface 10b, screen 1a is viewed from positions that are symmetrical with respect to perpendicular line 1c. Therefore, the colors of color mixing portions 2b and 3b are different when viewed from one viewpoint 36b. As a result, the color difference can be easily recognized by comparing the real and virtual images that appear side by side, preventing oversight of color mixing.

[0063] Although the embodiment and typical modifications have been described above, the above-described technology can be applied to various modifications other than the modifications exemplified.

[0064] Within the scope of the concept of the present invention, a person skilled in the art may conceive of various modifications and alterations, and it is understood that these modifications and alterations also fall within the scope of the present invention. For example, if a person skilled in the art appropriately adds, deletes, or modifies the design of the above-described embodiments and modifications, or adds, omits, or modifies the conditions of steps, these modifications will also fall within the scope of the present invention, as long as they maintain the gist of the present invention. [Industrial Applicability]

[0065] The present invention can be used in a display device inspection jig and a display device inspection method. [Explanation of symbols]

[0066] 1, 35 LCD display device 1a, 35a screen 1b back side 1c Perpendicular 2, 3 mirrors 2a, 3a, 10a mirror surface 2b, 3b color mixing section 4, 4b Placement section 4a, 4c holding part 4d Connection 6, 6a, 6b, 7, 7a, 7b Color comparison images 8. Housing 8a opening 9 Optical Lenses 10. Double-sided mirror 21, 24 Glass substrate 22 Transparent layer 23 Light blocking body 25 Black Matrix 26b, 26g, 26r color filters 27 Liquid crystal layer 36, 36a, 36b perspective 37 Observer

Claims

1. a mounting portion on which a display device can be mounted; a mirror disposed so as not to overlap with the screen when the screen of the display device placed on the placement section is viewed from the front; and a mirror surface of the mirror has an angle θ with respect to the perpendicular line so as to reflect a second component of the light emitted from the screen, the second component being emitted at an angle different from a first component that is emitted along a perpendicular line to the screen, in the same direction as the direction in which the first component is emitted; The display device inspection jig, wherein the angle θ is greater than 0 degrees and equal to or less than 45 degrees.

2. 2. The display device inspection jig according to claim 1, The mirror is provided in pair, The display device inspection jig, wherein the pair of mirrors are arranged to sandwich the screen when the screen is viewed from the front.

3. 2. The display device inspection jig according to claim 1, An inspection jig for a display device that displays, on a portion of the screen, colors that may be displayed if color mixing occurs.

4. 2. The display device inspection jig according to claim 1, a housing in which the mounting portion and the mirror are disposed, The display device inspection jig, wherein the housing has an opening on the front side of the screen through which the observer's viewpoint can be fixed.

5. 2. The display device inspection jig according to claim 1, An inspection jig for a display device, wherein an optical lens can be inserted and removed at a position that overlaps with the screen when viewed from the front.

6. a mounting portion on which a display device can be mounted; a mirror that is arranged at a position overlapping the screen when the screen of the display device placed on the placement section is viewed from the front, and that has a mirror surface that is aligned along a direction perpendicular to the screen; An inspection jig for a display device having the above features.

7. (a) placing the display device on a placement section; (b) a step in which, with the viewpoint of the observer positioned in front of the screen of the display device, the observer visually views the display image on the screen reflected in a mirror disposed adjacent to the screen as viewed from the observer; A method for inspecting a display device, comprising:

8. 8. The display device inspection method according to claim 7, In the step (b), the presence or absence of color mixing and the degree of color mixing are inspected.

9. 9. The method for inspecting a display device according to claim 8, In the step (b), the observer performs the inspection by comparing the image displayed on the screen with the image displayed on the screen reflected in the mirror.

10. 8. The display device inspection method according to claim 7, The mirror is provided in pair, A method for inspecting a display device, wherein the pair of mirrors are arranged to sandwich the screen when the screen is viewed from the front.

11. 8. The display device inspection method according to claim 7, In the step (b), colors that may be displayed when color mixing occurs are displayed on a part of the screen.

12. 8. The display device inspection method according to claim 7, the mounting portion and the mirror are disposed inside a housing, The method for inspecting a display device, wherein the housing has an opening on the front side of the screen through which the viewer's viewpoint can be fixed.

13. 8. The display device inspection method according to claim 7, (c) A method for inspecting a display device, in which, after the step (a), an optical lens that can be inserted into a region between the observer and the screen is inserted into the region, and the observer visually views the screen, thereby performing an inspection different from the inspection performed in the step (b).

Images