JP2010019763A - Display inspecting device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display inspecting device for distinguishing a dark spot of an FPD and dust. <P>SOLUTION: The display inspecting device for inspecting a display that color-displays based on brightness which elements develop by keeping a plurality of different primary colors arranged for each pixel includes a moving section 32 with a display 2 and a CCD 31 mounted thereon, for maintaining the position relation between the display 2 and the CCD 31 and moving in the line direction of element arrangement, a transmitting section (a mirror 34 and an unmagnification imaging lens 35) for folding back an image displayed on the display 2 to transmit to the CCD 31, and a controller 33 for determining with a defect point by a foreign material as a defect point when there is a difference in a defect point of an element on the display between an image that an image transmitted by the transmitting section is picked up by the CCD 31 before movement of the moving section 32 and an image that an image transmitted by the transmitting section is picked up by the CCD 31 after movement of the moving section 32. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a display inspection apparatus and a display inspection method for inspecting a flat panel display.

  When a flat panel display (hereinafter referred to as FPD) is incorporated into a small device such as a mobile phone, a transparent cover made of glass or plastic is generally provided on the FPD. In addition, there is a case where the transparent cover is provided while dust is present between the transparent cover and the FPD, and it is difficult to remove the dust. In addition, in the FPD, there are pixels (dots) that do not light with a high probability, and such pixels are called dark spots. Hereinafter, the structure of a liquid crystal display as an example of the FPD described above, and dust and dark spots in the liquid crystal display will be specifically described. FIG. 18 is a diagram illustrating a liquid crystal display in which dust and dark spots exist.

  As shown in FIG. 18, the liquid crystal display 9 includes glass plates 92 a and 92 b, a color filter 93, a liquid crystal 94, and a backlight 95. A transparent cover 91 is provided on the glass plate 92a of the liquid crystal display. The backlight 95 emits light to the liquid crystal 94. In addition, the liquid crystal 94 changes the light transmittance of the backlight 95 in units of color filters based on the voltage. The color filter 93 is a filter in which R (Red) G (Green) B (Blue) light is transmitted to one pixel. The glass plates 92a and 92b are highly transparent members provided so as to sandwich the color filter 93 and the liquid crystal 94 therebetween. The liquid crystal display 9 expresses the color of one pixel by additive color mixing by changing the transmittance of each of RGB light to the liquid crystal 94.

  Such a liquid crystal display 9 has many dark spots. For example, in the liquid crystal display 9 shown in FIG. 18, a dark spot exists in the liquid crystal 94 corresponding to the R color filter 93, and a pixel having such a dark spot cannot express a color normally. Moreover, as shown in FIG. 18, although dust may adhere on the transparent cover 91, since it is easy to remove such dust, it does not pose a problem. However, as described above, in the process of incorporating the liquid crystal display 9 into the device, when dust is caught between the transparent cover 91 and the glass plate 92a as shown in FIG. It is difficult.

  The above-mentioned dark spot and dust (hereinafter referred to as dust) sandwiched may be handled differently in the FPD inspection. For example, if the number or size of dust is less than the screening standards set for dust, the FPD is a non-defective product, and if the number or size of dark spots is below the screening standards set for dark spots, the FPD May be considered a non-defective product. In such a case, since each examination standard is different, it is necessary to distinguish between a dark spot and dust in the FPD.

Further, as a device for discriminating between dark spots and dust in the FPD as described above, there is known a transparent body inspection device capable of discriminating between defects of a transparent body and dust attached to the transparent body and automatically detecting them (for example, Patent Documents). 1).
Japanese Patent Laid-Open No. 10-176955

  However, the distinction between dark spots and dust by the difference in focal position means that the optical system has a high optical magnification so that blurring occurs due to the difference in thickness (1 mm or less) of the glass plate (that is, optical with a shallow depth of field). System). For this reason, there is a problem that it is impossible to image the entire surface of the FPD at a time, and it takes time to determine the inspection.

  The present invention has been made to solve the above-described problems, and provides a display inspection apparatus and method that can identify dark spots and dust on an FPD using an optical system having a lower optical magnification. The purpose is that.

  In order to solve the above-described problem, a display inspection apparatus is a display inspection apparatus that inspects a display that displays a color based on the luminance that the element develops a plurality of elements that generate different primary colors, and the elements generate colors. An imaging unit that captures an image, a display to be inspected, and the imaging unit, a moving unit that can move while maintaining a positional relationship between the display to be inspected and the imaging unit, and the inspection target A transmission unit that folds an image displayed on the display and transmits the image to the imaging unit, and an image obtained by imaging the image transmitted by the transmission unit by the imaging unit before the moving unit is moved as a first image A first image acquisition unit to acquire, and an image obtained by imaging the image transmitted by the transmission unit after the moving unit moves as the second image. It is determined whether there is a difference between the second image acquisition unit and the dot position of the element in the display imaged in the first image and the element dot position in the display imaged in the second image. A determination unit that determines that the point is a point due to a foreign object when it is determined that there is a difference.

  Further, the display inspection method is a display inspection method for inspecting a display that displays a color based on the luminance that the element develops, in which a plurality of elements that generate different primary colors are arranged for each pixel. The imaging unit is displayed on the inspection target display before moving the moving unit that can move while maintaining a positional relationship between the inspection target display and the imaging unit. A first image acquisition step of acquiring, as a first image, an image obtained by capturing an image transmitted by a transmission unit that folds an image and transmits the image to the imaging unit; and the imaging unit is configured to transmit the transmission unit after the moving unit has moved. A second image acquisition step of acquiring an image obtained by capturing an image transmitted by the second image as a second image; and a display captured by the first image. It is determined whether or not there is a difference between the dot position of the element to be detected and the dot position of the element in the display imaged in the second image. And a determination step for lacking.

  According to the present invention, there is an effect that a dark spot and dust on the FPD can be identified.

  Hereinafter, the prerequisite technology of the present invention will be described with reference to the drawings.

(Prerequisite technology)
First, the configuration of the display inspection apparatus according to the base technology will be described. FIG. 1 is a diagram showing a configuration of a display inspection apparatus according to the base technology. FIG. 2 is a diagram showing a mobile phone as an inspection target. Moreover, FIG. 3 is a figure which shows the example which images a display with dust from a different viewing angle. FIG. 4 is a diagram illustrating an example of imaging a display with a dark spot at different viewing angles. Moreover, in the following each figure, the same code | symbol has shown the same thing or the equivalent, and duplication description is abbreviate | omitted. In the base technology, the dark spot is a missing point of a predetermined luminance or less on the display.

  The display inspection apparatus 1 according to the base technology includes a camera 11, an inspection target moving unit 12, a camera 11, and a control unit 13 that controls the inspection target moving unit 12. The camera 11 includes a CCD moving unit 111, a CCD 112, and a lens 113. In addition, the mobile phone 2 is mounted on the inspection object moving unit 12 as an inspection object.

  The CCD 112 is an image sensor provided as a photosensitive surface of the camera 11. The CCD 112 preferably has 9 or more pixels as many as the number of pixels of the display 21 of the cellular phone 2 described later. The CCD moving unit 111 moves the CCD 112 in a predetermined direction parallel to the inspection target moving unit 12 (perpendicular to the optical axis of the lens 113). The lens 113 is an optical system having an optical magnification of 1 ×, but may be an optical system having an optical magnification of 1 × or less.

  The inspection object moving unit 12 moves the mobile phone 2 mounted in a direction opposite to the direction in which the CCD moving unit 111 moves the CCD 112 in parallel (perpendicular to the optical axis of the lens 113). is there.

  The mobile phone 2 includes a display 21 as shown in FIG. In the base technology, the display 21 is a liquid crystal display having the same configuration as the liquid crystal display 9 shown in FIG. The display 21 has RGB color filters arranged in one pixel, and the inspection object moving unit 12 moves the mobile phone 2 in the arrangement direction of the color filters. The display 21 may be a flat panel display in which a plurality of primary colors in a mixed color such as LED, EL, VFD, and PDP are arranged in a pixel as a color filter.

  With the above-described configuration, the display inspection apparatus 1 according to the base technology moves the CCD 112 from i1 to i2, and moves the mobile phone 2 from p1 to p2, thereby imaging the display 21 at different viewing angles (a1 or a2). To do. By imaging the display from different viewing angles, it is possible to determine black spots (dots) that are unknown whether dust or dark spots. For example, as shown in FIG. 3, when the black spot is dust, the light of the R color filter under the dust reaches the CCD 112 by changing the viewing angle. Also, as shown in FIG. 4, when the black dot is a dark spot, the R color filter above the dark spot of the liquid crystal is not emitting light, so even if the viewing angle is changed, the light of the R color filter reaches the CCD 112. Absent.

  Here, the viewing angle to be changed will be described. The difference between a1 and a2 is a3, the thickness of the glass plate on the color filter of the display 21 (that is, the distance from the color filter to dust) is d, and the width of the color filter in the arrangement direction is e. In this case, the expression a3 = tan (d / e) is established.

  Further, the distance between the CCD 112 and the lens 113 and the ratio between the lens 113 and the display 21 are 1: 1. This ratio is due to the optical magnification of the lens 113. When the optical magnification of the lens 113 is A, the distance between the CCD 112 and the lens 113 is B, and the distance between the lens 113 and the display 21 is C, C = B / A. For example, when the optical magnification of the lens 113 is 0.5, the ratio of B and C is 1: 2.

  Next, the operation of the display inspection apparatus according to the base technology will be described. FIG. 5 is a flowchart showing the operation of the display inspection apparatus according to the base technology. In the initial state, the position of the imaging unit is i1, and the position of the mobile phone is p1. In FIG. 5, it is assumed that the control unit 13 sets the display 21 of the mobile phone 2 to a predetermined luminance.

  First, the control unit 13 causes the camera 11 to image the display 21 of the mobile phone 2 (S101), and executes a process of detecting black spots on the display 21 by image processing based on the captured image (S102). It is determined whether or not a black spot exists above (S103).

  When a black spot exists on the display 21 (S103, YES), the control unit 13 causes the CCD moving unit 111 to move the CCD 112 to i2, and causes the inspection target moving unit 12 to move the mobile phone 2 to p2 (S104). . The moving distance of the CCD 112 is not less than the width in the color filter array direction, and the moving distance of the mobile phone 2 (display 21) is not less than the product of the width in the array direction of the color filter and the optical magnification of the lens 113. Note that these movement distances are preferably such that they are shifted by one color filter on the captured image.

  Next, the control unit 13 causes the camera 11 to image the display 21 again (S105), executes a process of detecting a black spot on the display 21 by image processing based on the captured image (S106), and detects in step S102. A comparison is made with the position of the black spot on the captured image (S107). Here, the control unit 13 determines whether or not there is a position change in the captured image in the comparison of the positions of the black spots (S108). A specific method for comparing the positions of black spots will be described later.

  In the comparison of the positions of the black spots, if it is determined that there is a position change in the captured image, that is, if the black spots are due to dust (S108, YES), a foreign substance inspection process described later is executed (S109).

  Here, the change of the position in the picked-up image of a black spot is demonstrated using FIG.6 and FIG.7. FIG. 6 is a diagram illustrating the position of the black spot in the captured image before moving the imaging position. FIG. 7 is a diagram illustrating the position of the black spot in the captured image after the imaging position is moved. FIG. 8 is a diagram showing the luminance of the color filter. FIG. 9 is a diagram illustrating color filters with different brightness in the captured image.

  As shown in FIG. 6, the position of the black spot in the captured image before moving the imaging position is on the R color filter. In addition, as shown in FIG. 7, the position of the black spot in the captured image after moving the imaging position captured at different viewing angles is on the B color filter. The control unit 13 determines whether there is a change in the position of the black spot on the captured image by comparing the color of the color filter around the black spot in the captured image. Note that the control unit 13 may determine whether there has been a change in the position of the dust on the captured image by measuring the distance from the specific color filter in the captured image using the specific color filter as a reference. .

  When a monochrome camera is used as the camera 11, as shown in FIG. 8, the control unit 13 sets liquid crystals corresponding to the RGB color filters to different luminances. As a result, as shown in FIG. 9, the RGB color filters in the grayscale captured image have different colors, and the control unit 13 can compare the colors of the color filters around the black spot. In general, a color camera requires 3 × 3 pixels or more for one element as compared with a monochrome camera. Therefore, by using a monochrome camera as the camera 11, the number of effective pixels is increased as compared with the case of using a color camera having the same number of elements, and a captured image with higher resolution can be obtained.

  If it is determined in step S108 in FIG. 5 that there is no position change in the captured image in the comparison of the positions of the black spots, that is, if the black spots are due to dark spots (S108, NO), the control unit 13 Then, a dark spot inspection process to be described later is executed (S110).

  In step S103, when there is no black spot on the display 21 (S103, NO), the control unit 13 ends the process.

  As described above, when a black spot is present on the display 21, the display inspection apparatus 1 according to the base technology determines whether or not there is a change in the type of color filter around the black spot in an image captured at a different viewing angle. Thus, it can be determined whether the black spot on the display 21 is dust or a dark spot.

  Next, the operation of the foreign substance inspection process will be described. This foreign matter inspection process corresponds to step S109 in FIG. FIG. 10 is a flowchart showing the operation of the foreign substance inspection process. The inspection standard in FIG. 10 is a predetermined standard.

  First, the control unit 13 obtains the size and number of dusts and the interval between these dusts (hereinafter collectively referred to as dust amount) from the captured image (S201), and the dust amount is below the inspection standard. Is determined (S202).

  When the amount of dust is less than or equal to the inspection standard (S202, YES), the control unit 13 sets the display 21 as a non-defective product (S203).

  On the other hand, when the amount of dust is larger than the inspection standard (S202, NO), the control unit 13 sets the display 21 as a foreign object defective product (S204).

  Next, the operation of the dark spot inspection process will be described. This dark spot inspection process corresponds to step S110 in FIG. FIG. 11 is a flowchart showing the operation of the dark spot inspection process. The inspection standard in FIG. 11 is a predetermined standard.

  First, the control unit 13 obtains the size and number of dark spots and the interval between these dark spots (hereinafter collectively referred to as the dark spot amount) from the captured image (S301), and the dark spot amount. Is less than or equal to the inspection standard (S302).

  When the amount of dark spots is equal to or less than the inspection standard (S302, YES), the control unit 13 sets the display 21 as a non-defective product (S303).

  On the other hand, when the amount of dark spots is larger than the inspection standard (S302, NO), the control unit 13 sets the display 21 as a dark spot defective product (S304).

  According to the foreign substance inspection process and the dark spot inspection process described above, the display inspection apparatus 1 according to the base technology sets the display 21 as a foreign object defective when the amount of dust is larger than the predetermined inspection standard, and the dark spot from the predetermined inspection standard. When the amount is large, the display 21 can be a defective product. Thereby, the display inspection apparatus 1 according to the base technology can distinguish the display 21 as a defective product having a black spot equal to or higher than a predetermined inspection standard into a dust display and a dark spot display.

(Embodiment 1)
The base technology described above is to determine the dark spot and dust by moving the camera 11 and the mobile phone 2 in the opposite directions by the inspection object moving unit 12 and the CCD moving unit 111, respectively, and changing the viewing angle. By bending (turning back) the optical axis (image) of the telephone 2, the inspection object moving unit 12 or the CCD moving unit 111 can be eliminated, and a single moving unit can discriminate between dark spots and dust (foreign matter). it can.

  A configuration of the display inspection apparatus according to the first embodiment will be described. FIG. 12 is a diagram illustrating a configuration of the display inspection apparatus according to the first embodiment. In the present embodiment, the dark spot is a dot missing below a predetermined luminance on the display.

  The display inspection apparatus 3 according to the present embodiment includes a CCD 31 (imaging unit), a moving unit 32 (moving unit), two mirrors 34 (transmitting unit), and an equal magnification imaging lens 35 (transmitting unit, optical system). Is provided. Further, the mobile unit 2 equipped with the CCD 31 and the display 21 as an inspection object is mounted on the moving unit 32.

  The display inspection apparatus 3 controls the display brightness of the display 21 and controls the moving unit 32, and also performs a control unit 33 (first image acquisition unit, A second image acquisition unit and a determination unit). Note that the arithmetic processing of the control unit 33 is realized by cooperation of hardware resources (not shown) such as a CPU and a storage device and a program stored in advance in the storage device.

  Further, the CCD 31 and the display 21 are installed so that the light receiving surface of the CCD 31 and the display surface of the display 31 are on the same plane. In addition, since the display 21 is inspected by one imaging, the size of the light receiving surface of the CCD 31 is equal to or larger than the size of the display surface of the display 21 and is 9 times or more the number of pixels of the display 21 of the mobile phone 2. Those with pixels are desirable.

  The moving unit 32 moves the CCD 31 and the mobile phone 2 mounted on the moving unit 32 by the same distance in the direction of the arrangement of the color filters. The two mirrors 34 bend the image displayed on the display 21 of the mobile phone 2 (hereinafter referred to as an image of the display 21) by 180 degrees and transmit it. The equal-magnification imaging lens 35 is disposed between the two mirrors 34, and the image of the display 21 of the mobile phone 2 reflected by the mirror 34 disposed on the display 31 side is magnified to the CCD 31. This is for imaging through the mirror 34 arranged on the side. The mirror 34 and the equal magnification imaging lens 35 may be arranged at any angle and position as long as the image of the display 21 is formed on the CCD 31 at the same magnification.

  With the configuration described above, the display inspection apparatus 3 is in a state where the image of the display 21 is bent 180 degrees to the light receiving surface of the CCD 31 on the same plane as the display surface of the display 21 by the mirror 34 and the lens for equal magnification imaging 35. The image is formed at the same magnification, and the CCD 31 captures an image on the display 21. In addition, when the display 21 of the mobile phone 2 is moved in parallel with the folded optical axis plane, the image to be formed also moves in the same direction and the same distance. That is, [p2-p1] = [i2-i1]. Therefore, by driving the mobile phone 2 and the CCD 31 only by the same moving unit 32, images of the display 21 having different viewing angles (a1 or a2) can be taken as in the base technology.

  In the first embodiment, the mobile phone 2 and the CCD 31 are moved by one moving unit 32. However, the mobile phone 2 and the CCD 31 are fixed, and the mirror 34 and the equal magnification imaging lens 35 are moved. Needless to say, the same effect can be obtained.

  In the first embodiment, the image of the display 21 to be inspected is bent 180 degrees and transmitted to the CCD 31 that is the image pickup unit. However, the inspection object and the image pickup unit are moved in the same direction and the same distance to detect the defect. Any bending angle may be used as long as it can be bent. In addition, the CCD 31 is imaged on the CCD 31 at the same plane on the display 21 as the display 21, but if the inspection object and the imaging unit are moved in the same direction and the same distance, the position / magnification can be determined and checked for defects. Any position / magnification is acceptable.

  Next, the operation of the display inspection apparatus 3 is shown in the flowchart of FIG. In the initial state, the position of the CCD 31 is i1 in FIG. 12, and the position of the mobile phone 2 is p1. In FIG. 13, the control unit 33 assumes that the display 21 is set to the highest brightness for each of the R component, the G component, and the B component so that each pixel is white. Not what you want. The operation of the display inspection apparatus according to the present embodiment is the same as that of the above-described base technology except for S401, and thus the description thereof is omitted.

  When there is a black spot (dot missing) on the display 21 (S103, YES), the control unit 33 simultaneously moves the mobile phone 2 and the CCD 31 in the same direction and distance by the moving unit 32 (S401, movement control step). The moving distance is desirably a distance that can be shifted by one color filter on the imaging screen, as in the base technology. The moving direction is the color filter array direction (see FIGS. 6 and 7). The operation after moving the mobile phone 2 and the CCD 31 is the same as that of the base technology as described above.

  In the display inspection apparatus according to the present embodiment, the image before moving (first image) and the image after moving (second image) are excluded by eliminating the determination of the presence or absence of black spots on the display 21 (S103). After the acquisition, it is also possible to collectively determine the presence or absence of a black spot when comparing the black spot position (S108). Note that it is possible to determine the dark spot and the dust only by comparing the black spot positions. However, by providing the determination of the presence or absence of black spots (S103), the moving process, the imaging process, and the black spot comparison process at the time of inspection of the display 21 where no black spots exist can be eliminated, and the inspection process time can be shortened. .

  According to the first embodiment, the dark spot and the dust inspection can be performed even if the mobile phone 2 and the CCD 31 are moved in the same direction and the same distance by the mirror 34 and the equal magnification imaging lens 35, and one movement. Since the inspection can be performed at the part, the capital investment can be kept low and the process can be simplified.

(Embodiment 2)
In the first embodiment described above, all pixels on the display cannot be inspected at one time unless the size of the light receiving surface of the CCD is equal to or greater than the size of the display surface of the display. In the second embodiment, a mode in which the size of a light receiving surface that receives light by a CCD is reduced by using a relay optical system (that is, the number of CCD image pickup devices is reduced) will be described. Further, in the second embodiment, it is possible to use the camera 11 including the premise technology of the CCD 112 that can make the size of the light receiving surface of the CCD smaller than the size of the display surface to be inspected.

  A configuration of the display inspection apparatus according to the second embodiment will be described. FIG. 14 is a diagram showing the configuration of the display inspection apparatus according to the second embodiment.

  The display inspection device 4 is replaced with the CCD 31 in the display inspection device 3 of the first embodiment, and includes a camera 11 (imaging unit), a field lens 42A (relay optical system, imaging unit), 42B (relay optical system, imaging unit), A fixing jig 41 is provided. The camera 11 includes a CCD 112 and a lens 113 (reduction imaging optical system). Further, a fixing jig 41 is set on the moving unit 32, and the field lens 42B, the camera 11, and the mobile phone 2 are mounted as inspection objects on the fixing jig 41. Since the units other than these units are the same as those in the first embodiment, the description thereof is omitted here.

  The field lenses 42 </ b> A and 42 </ b> B implement a relay optical system, and the field lens 42 </ b> A and 42 </ b> B transmits the image of the display 21 transmitted at the same magnification to the camera 11. The transmitted image is maintained at an equal magnification between the field lenses 42A and 42B. The field lens 42A is installed on the same plane as the display surface of the display 21 of the mobile phone 2 to be inspected, and the field lens 42B is installed on the fixing jig 41.

  Next, details of black spot image acquisition in the relay optical system will be described. 15 and 16 are conceptual diagrams in which the units from the display 21 to the CCD 112 shown in FIG. 14 are developed along the optical axis. 15 shows a state before the movement by the moving unit 32, and FIG. 16 shows a state after the movement by the moving unit 32.

  As shown in FIG. 15, before moving, for example, when dust is attached to the center of the display 21 of the mobile phone 2, an image appears on the CCD 112 where the black spot 5 in the hollow of the display surface of the display 21 appears at the center. In comparison, as shown in FIG. 16, the display 21, the field lens 42B, the lens 113, and the CCD 112 are moved so that the dust attached to the center is the center of the image in FIG. The image is shifted without change.

  In the above-mentioned base technology, it is necessary to control the movement of the camera 11 and the inspection object moving unit 12 so that the control unit 13 has the same distance in the opposite direction, as can be seen from FIGS. 15 and 16. The control unit 33 according to the second embodiment (same as the first embodiment and the third embodiment described later) can achieve the same effect by moving control of only the moving unit 32.

  According to the above-described configuration, the control unit 33 can capture the image of the display 21 transmitted at the same magnification by the two field lenses 42 </ b> A and B by the camera 11. The control unit 33 can acquire images with different viewing angles by simultaneously moving the mobile phone 2, the camera 11, and the field lens 42 </ b> B by the moving unit 32.

  According to the present embodiment, the viewing angle is also provided by the camera 11 including the field technology 42A and 42B and using the relay optical system, the CCD 11 having the premise technology in which the size of the imaging device can be smaller than the size of the display device to be inspected. It is possible to take images of the mobile phones 2 having different sizes.

(Embodiment 3)
In the second embodiment described above, by providing the relay optical system, the camera 11 including the imaging device (CCD 112) equivalent to the base technology can be used, but the relay optical system is not used but the projection system is used. Also, the camera 11 can be used.

  A configuration of the display inspection apparatus according to the third embodiment will be described. FIG. 17 is a diagram illustrating a configuration of the display inspection apparatus according to the third embodiment.

  The display inspection apparatus 6 according to the third embodiment includes a diffusion plate 61 (projection system, imaging unit) instead of the field lenses 42A and 42B in the above-described embodiment. In addition, the diffusion plate 61, the camera 11 (imaging unit), and the mobile phone 2 are mounted as inspection targets on the fixing jig 41.

  The diffusing plate 61 projects the image of the display 21 transmitted at the same magnification by the mirror 34 and the equal magnification imaging lens 35, and is attached to the fixing jig 41 so as to be on the same plane as the display 21. Installed. Since the configuration other than this is the same as in the first and second embodiments, the description thereof is omitted here.

  According to the above-described configuration, the image of the display 21 transmitted at the same magnification is projected once on the diffusion plate, and the image of the projected display 21 can be taken again with the camera 11 being reduced. Further, since the control unit 33 simultaneously moves the mobile phone 2, the camera 11 and the diffusion plate 6 by the moving unit 32, the image projected on the diffusion plate 61 also moves in the same direction and the optical axis of the camera is An image with a different viewing angle can be acquired without change.

  As described in the third embodiment, by providing the diffusion plate 61 in place of the field lenses 42A and 42B, the above-described premise technique that allows the size of the image sensor to be smaller than the size of the display element to be inspected as in the second embodiment. The camera 11 having the CCD 112 can also take images of the mobile phone 2 having different viewing angles.

  It is assumed that the color filter 93 and the backlight 95 in FIG. 18 described in the prior art constitute elements that generate a plurality of different primary colors.

As mentioned above, according to this Embodiment, the technical idea shown with the following additional remarks is disclosed.
(Supplementary Note 1) A display inspection apparatus that inspects a display that displays a color based on the luminance that the element that develops a plurality of different primary colors is arranged for each pixel, and the element develops color,
An imaging unit that captures an image;
A moving unit that is equipped with a display to be inspected and the imaging unit, and can move while maintaining a positional relationship between the display to be inspected and the imaging unit,
A transmission unit that folds an image displayed on the display to be inspected and transmits the image to the imaging unit;
A first image acquisition unit that acquires, as a first image, an image obtained by imaging the image transmitted by the transmission unit by the imaging unit before the movement of the moving unit;
A second image acquisition unit that acquires, as a second image, an image obtained by imaging the image transmitted by the transmission unit after the moving unit has moved;
It is determined whether or not there is a difference between the dot position of the element in the display imaged in the first image and the dot position of the element in the display imaged in the second image. A determination unit that sets the point missing as a point due to a foreign substance;
A display inspection apparatus comprising:
(Supplementary note 2) In the display inspection apparatus according to supplementary note 1,
The transmission unit is
Two mirrors,
An optical system that keeps the image of the display at an equal magnification between the mirrors,
One of the mirrors transmits the image displayed on the display to be inspected by bending 90 degrees, and the other mirror transmits the bent image transmitted through the optical system by 90 degrees. A display inspection apparatus that transmits the image to the imaging unit by bending.
(Supplementary Note 3) In the display inspection apparatus according to Supplementary Note 2,
The imaging unit is installed such that its light receiving surface is flush with the surface of the display to be inspected, and forms an image transmitted by the transmission unit on the light receiving surface at an equal magnification. Display inspection equipment.
(Supplementary Note 4) In the display inspection apparatus according to Supplementary Note 2,
The imaging unit
A transmission optical system that maintains the magnification of the image transmitted by the transmission unit, the relay optical system including at least two optical systems;
A reduced imaging optical system that reduces an image transmitted by the relay optical system and forms the reduced image on a light receiving surface of the imaging unit, and
One of the relay optical systems is installed on the same plane as a surface of the display to be inspected, and a positional relationship with the transmission unit is maintained.
(Supplementary Note 5) In the display inspection apparatus according to Supplementary Note 2,
The imaging unit
A projection system for projecting the image transmitted by the transmission unit;
A reduced imaging optical system that reduces an image projected on the projection system and forms the reduced image on a light receiving surface of the imaging unit, and
The display inspection apparatus, wherein the projection system is installed on the same plane as the surface of the display to be inspected.
(Appendix 6) In the display inspection apparatus according to any one of Appendix 1 to Appendix 5,
The display unit according to claim 1, wherein when there is no difference in the dot position of the element between the first image and the second image, the determination unit sets the dot point of the display as a dot point due to a dark spot.
(Appendix 7) In the display inspection apparatus according to either appendix 4 or appendix 5,
The display inspection apparatus according to claim 1, wherein an optical magnification of the reduced imaging optical system is 1 or less.
(Supplementary note 8) In the display inspection apparatus according to any one of supplementary notes 1 to 7,
The imaging unit captures an image in monochrome,
The determination unit determines whether or not there is a difference in the dot position of the element depending on whether the brightness of the element adjacent to the dot in the second image and the element adjacent to the dot in the first image are different. A display inspection apparatus characterized by determining.
(Supplementary note 9) In the display inspection apparatus according to any one of supplementary notes 1 to 8,
If the determination unit determines that there is a difference in the dot position of the element between the first image and the second image, it determines whether the size or number of the dot points exceeds a predetermined reference. A display inspection apparatus characterized in that, when it is determined that the size or number of the dot is greater than a predetermined reference, the display is determined to be a defective product having a dot due to foreign matter.
(Supplementary Note 10) In the display inspection apparatus according to any one of Supplementary Notes 1 to 9,
If the determination unit determines that there is no difference in the dot position of the element between the first image and the second image, whether or not the size or number of the dot points exceeds a predetermined criterion. A display inspection apparatus characterized in that, when it is determined that the size or number of the dot is greater than a predetermined standard, the display is determined to be a defective product having a dot due to a dark spot.
(Supplementary note 11) In the display inspection apparatus according to any one of supplementary notes 1 to 10,
And a determination unit that determines whether or not there is an element dot on the display to be inspected in the first image acquired by the first image acquisition unit,
The second image acquisition unit further acquires a captured image after the movement of the moving unit as the second image when the determination unit determines that there is no dot missing of the element. apparatus.
(Supplementary Note 12) A display inspection method for inspecting a display that displays a color based on the luminance that the element that develops a plurality of different primary colors is arranged for each pixel, and the element develops color,
The imaging unit is mounted with the display to be inspected and the imaging unit, and before the movement of the moving unit capable of moving while maintaining the positional relationship between the display to be inspected and the imaging unit, the imaging unit A first image acquisition step of acquiring, as a first image, an image obtained by capturing an image transmitted by a transmission unit that folds an image displayed on a display and transmits the image to the imaging unit;
A second image acquisition step of acquiring, as a second image, an image obtained by imaging the image transmitted by the transmission unit after the moving unit has moved;
It is determined whether or not there is a difference between the dot position of the element in the display imaged in the first image and the dot position of the element in the display imaged in the second image. A determination step in which the dot missing is a dot missing due to a foreign object;
Perform display inspection method.
(Supplementary note 13) In the display inspection method according to supplementary note 12,
The transmission unit is
Two mirrors,
An optical system that keeps the image of the display at an equal magnification between the mirrors,
One of the mirrors transmits the image displayed on the display to be inspected by bending 90 degrees, and the other mirror transmits the bent image transmitted through the optical system by 90 degrees. A display inspection method comprising: transmitting to the imaging unit by bending.
(Supplementary note 14) In the display inspection method according to supplementary note 13,
The imaging unit is installed such that its light receiving surface is flush with the surface of the display to be inspected, and forms an image transmitted by the transmission unit on the light receiving surface at an equal magnification. Display inspection method.
(Supplementary note 15) In the display inspection method according to supplementary note 13,
The imaging unit
A transmission optical system that maintains the magnification of the image transmitted by the transmission unit, the relay optical system including at least two optical systems;
A reduced imaging optical system that reduces an image transmitted by the relay optical system and forms the reduced image on a light receiving surface of the imaging unit, and
One of the relay optical systems is installed on the same plane as the surface of the display to be inspected, and the positional relationship with the transmission unit is maintained.
(Supplementary note 16) In the display inspection method according to supplementary note 13,
The imaging unit
A projection system for projecting the image transmitted by the transmission unit;
A reduced imaging optical system that reduces an image projected on the projection system and forms the reduced image on a light receiving surface of the imaging unit, and
The display inspection method, wherein the projection system is installed on the same plane as the surface of the display to be inspected.
(Supplementary note 17) In the display inspection method according to any one of supplementary notes 12 to 16,
The display step according to claim 1, wherein, in the first image and the second image, if there is no difference in the dot position of the element, the dot point of the display is set as a dot point due to a dark spot.
(Supplementary Note 18) In the display inspection method according to either Supplementary Note 15 or Supplementary Note 16,
A display inspection method, wherein an optical magnification of the reduced imaging optical system is 1 or less.
(Supplementary note 19) In the display inspection method according to any one of supplementary notes 12 to 18,
The imaging unit captures an image in monochrome,
In the determination step, whether or not there is a difference in the dot position of the element depending on whether the brightness of the element adjacent to the dot in the second image and the element adjacent to the dot in the first image are different. A display inspection method characterized by determining.
(Supplementary note 20) In the display inspection method according to any one of supplementary notes 12 to 19,
In the determination step, if it is determined that there is a difference in the dot position of the element between the first image and the second image, it is determined whether the size or number of the dot points exceeds a predetermined reference. A display inspection method characterized in that, when it is determined that the size or number of the dot is greater than a predetermined reference, the display is determined to be a defective product having a dot due to foreign matter.
(Supplementary note 21) In the display inspection method according to any one of supplementary notes 12 to 20,
In the determination step, if it is determined that there is no difference in the dot position of the element between the first image and the second image, it is determined whether the size or number of the dot points exceeds a predetermined reference. A display inspection method characterized in that, when it is determined that the size or number of the dot is greater than a predetermined reference, the display is determined to be a defective product having a dot due to a dark spot.

It is a figure which shows the structure of the display test | inspection apparatus which concerns on a base technology. It is a figure which shows the mobile telephone as a test object. It is a figure which shows the example which images the display with dust from a different viewing angle. It is a figure which shows the example which images a display with a dark spot with a different viewing angle. It is a flowchart which shows operation | movement of the display test | inspection apparatus which concerns on a base technology. It is a figure which shows the position of the black spot in the captured image before an imaging position movement. It is a figure which shows the position of the black spot in the captured image after an imaging position movement. It is a figure which shows the brightness | luminance of a color filter. It is a figure which shows the color filter from which the brightness in a captured image differs. It is a flowchart which shows the operation | movement of a foreign material inspection process. It is a flowchart which shows the operation | movement of a dark spot inspection process. It is a figure which shows the structure of the display test | inspection apparatus which concerns on Embodiment 1. FIG. 3 is a flowchart showing an operation of the display inspection apparatus according to the first embodiment. It is a figure which shows the structure of the display test | inspection apparatus which concerns on Embodiment 2. FIG. It is the conceptual diagram which developed each unit before the movement from the display 21 to CCD112 along the optical axis (before movement). It is the conceptual diagram which developed each unit after the movement from the display 21 to CCD112 along the optical axis (after movement). It is a figure which shows the structure of the display test | inspection apparatus which concerns on Embodiment 3. FIG. It is a figure which shows the liquid crystal display in which dust and a dark spot exist.

Explanation of symbols

  2 Cellular phone, 3 Display inspection device, 4 Display inspection device, 6 Display inspection device, 11 Camera, 21 Display, 31 CCD, 32 Moving unit, 33 Control unit, 34 Mirror, 35 1X imaging lens, 41 Fixed treatment Tools, 42A field lens, 42B field lens, 61 diffuser plate, 112 CCD, 113 lens.

Claims (6)

A display inspection apparatus that inspects a display that displays a color based on the luminance that the element develops a plurality of different primary colors and that is arranged for each pixel,
An imaging unit that captures an image;
A moving unit that is equipped with a display to be inspected and the imaging unit, and can move while maintaining a positional relationship between the display to be inspected and the imaging unit,
A transmission unit that folds an image displayed on the display to be inspected and transmits the image to the imaging unit;
A first image acquisition unit that acquires, as a first image, an image obtained by imaging the image transmitted by the transmission unit by the imaging unit before the movement of the moving unit;
A second image acquisition unit that acquires, as a second image, an image obtained by imaging the image transmitted by the transmission unit after the moving unit has moved;
It is determined whether or not there is a difference between the dot position of the element in the display imaged in the first image and the dot position of the element in the display imaged in the second image. A determination unit that sets the point missing as a point due to a foreign substance;
A display inspection apparatus comprising: The display inspection apparatus according to claim 1,
The transmission unit is
Two mirrors,
An optical system that keeps the image of the display at an equal magnification between the mirrors,
One of the mirrors transmits the image displayed on the display to be inspected by bending 90 degrees, and the other mirror transmits the bent image transmitted through the optical system by 90 degrees. A display inspection apparatus that transmits the image to the imaging unit by bending. The display inspection apparatus according to claim 2,
The imaging unit is installed such that its light receiving surface is flush with the surface of the display to be inspected, and forms an image transmitted by the transmission unit on the light receiving surface at an equal magnification. Display inspection equipment. The display inspection apparatus according to claim 2,
The imaging unit
A transmission optical system that maintains the magnification of the image transmitted by the transmission unit, the relay optical system including at least two optical systems;
A reduced imaging optical system that reduces an image transmitted by the relay optical system and forms the reduced image on a light receiving surface of the imaging unit, and
One of the relay optical systems is installed on the same plane as a surface of the display to be inspected, and a positional relationship with the transmission unit is maintained. The display inspection apparatus according to claim 2,
The imaging unit
A projection system for projecting the image transmitted by the transmission unit;
A reduced imaging optical system that reduces an image projected on the projection system and forms the reduced image on a light receiving surface of the imaging unit, and
The display inspection apparatus, wherein the projection system is installed on the same plane as the surface of the display to be inspected. A display inspection method for inspecting a display that displays a color based on the luminance that the element develops a plurality of different primary colors and arranged for each pixel,
The imaging unit is mounted with the display to be inspected and the imaging unit, and before the movement of the moving unit capable of moving while maintaining the positional relationship between the display to be inspected and the imaging unit, the imaging unit A first image acquisition step of acquiring, as a first image, an image obtained by capturing an image transmitted by a transmission unit that folds an image displayed on a display and transmits the image to the imaging unit;
A second image acquisition step of acquiring, as a second image, an image obtained by imaging the image transmitted by the transmission unit after the moving unit has moved;
It is determined whether or not there is a difference between the dot position of the element in the display imaged in the first image and the dot position of the element in the display imaged in the second image. A determination step in which the dot missing is a dot missing due to a foreign object;
Perform display inspection method.

Images