JP2002340739A - Apparatus and method for inspecting display screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for inspecting a display screen which rapidly and accurately detects a defective pixel with a low cost and simple constitution and can specify its coordinates. SOLUTION: The apparatus for inspecting the display screen captures the defective pixel in the display screen for displaying each display pixel corresponding to each display element disposed in a matrix-like state in a visual field of an imaging means and specifies the coordinates of the defective pixel. The apparatus comprises the imaging means, divided screen display means for individually displaying the respective divided screens by dividing the display screen into a plurality, a schematic coordinate range detecting means for judging the divided screen duplicated with the visual field of the imaging means which captures the defective pixel based on the individual displays and detecting the coordinate ranges of the divided screen as the schematic coordinate range, and a defective pixel coordinate specifying means for specifying the coordinates of the defective pixel by retrieving the defective pixel in the visual field of the imaging means by scanning the display pixel in the schematic coordinate range in each direction of two-dimensional coordinates of the matrix and displaying the display pixel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display screen inspection apparatus and a display screen inspection method for a display screen such as an LCD panel, a plasma display, and an EL display.

[0002]

2. Description of the Related Art In recent years, as typified by, for example, an LCD panel, a display screen for displaying each display pixel corresponding to each display element arranged in a matrix for miniaturization and high image quality. Demand is increasing and it is desired to reduce the price. For this purpose, a technique for detecting (inspection) defective pixels (defective pixels) on a completed display screen and replacing the detected defective pixels with normal pixels ( Repair: healing) technology is essential. In this case, it is necessary to detect the exact coordinates of the defective pixel in the display screen (the address when viewed as the target area). A conventional detection (inspection) method of this type and an apparatus for performing the same are roughly classified into two.

[0003] First, the entire state of the display screen to be inspected (sample) is imaged by high-resolution imaging means and captured as image data of the entire display screen, and defective pixels are detected based on the image data.・ A method or device for analysis. The second is a method by a so-called skilled worker. In other words, for a display screen that may now have more than one million pixels, the presence of defective pixels can be checked with the naked eye toward the display screen or by moving a small camera facing the display screen and looking into the microscope. Like so
This is a method in which the coordinates are visually checked, and thereafter, the coordinates at the time of coincidence with the defective pixel are read by emitting light (displaying) one by one using a ten o'clock cursor or all pixels on the display screen one by one.

[0004]

First, in the first method, a large and high-resolution camera capable of collectively capturing an image of a display screen, or a high-resolution small camera and a moving mechanism capable of accurately moving coordinates are used. This is necessary, and results in an expensive and complicated configuration. On the other hand, in the second method, the resolution of the camera need only be such that the presence of a defective pixel can be determined, and an accurate moving mechanism is not required. Therefore, although the configuration is inexpensive as a whole, it requires a high degree of skill, In order to obtain the coordinates of the defective pixel, it takes extra time and inaccuracy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display screen inspection apparatus and a display screen inspection method capable of quickly and accurately detecting a defective pixel and specifying its coordinates with an inexpensive and simple configuration.

[0006]

According to a first aspect of the present invention, there is provided a display screen inspection apparatus for picking up a defective pixel in a display screen which displays each display pixel corresponding to each display element arranged in a matrix. A display screen inspection device that captures within the field of view of the means and specifies the coordinates of the defective pixel, wherein the imaging means;
The display screen is divided into a plurality of divided screens, and divided screen display means for individually displaying each divided screen, and a divided screen overlapping a field of view of the imaging means capturing a defective pixel are determined based on the individual display. A rough coordinate range detecting means for detecting a coordinate range of the divided screen as a rough coordinate range; and a display pixel in the rough coordinate range is scanned and displayed in each direction of the two-dimensional coordinates of the matrix to display the image. Defective pixel coordinate specifying means for searching for the defective pixel in the visual field of the means and specifying the coordinates thereof.

In this display screen inspection apparatus, the defective pixel in the display screen is captured in the field of view of the imaging means, and the coordinates of the defective pixel are specified. In this case, since the divided screens obtained by dividing the display screen can be individually displayed, a divided screen overlapping with the field of view of the imaging means capturing the defective pixel can be determined, and the coordinate range of the divided screen is detected as a rough coordinate range, and the rough coordinate is detected. By searching within the range, the coordinates of the defective pixel can be specified. In this case, since the coordinates of the defective pixel are narrowed down to the approximate coordinate range, the search range can be reduced (narrow), and the coordinates can be specified more quickly and accurately than by searching the entire display screen as a range. . Here, the field of view and the resolution of the imaging means are sufficient to be able to catch defective pixels, so that inexpensive imaging means can be employed. In addition, if the divided screen overlapping the field of view can be determined, the current position of the imaging unit can be determined (understood) in reverse from the coordinate range. Therefore, it is not necessary to always accurately grasp the position of the imaging unit itself, and rough position control is possible. And the mechanism for position control can be inexpensive and simple in construction (extremely,
It can be hand-held.)

Further, in the display screen inspection apparatus according to the first aspect, when the defective pixel coordinate specifying means displays a divided screen overlapping the visual field, the defective pixel coordinate specifying means selects a display pixel group which does not satisfy the luminance level defined by the inspection standard. It is preferable to have a pixel group luminance level determining means for detecting as a display pixel group including the defective pixel.

In this display screen inspection apparatus, when a divided screen overlapping the field of view is displayed, a display pixel group that does not satisfy the luminance level defined by the inspection standard is detected as a display pixel group including defective pixels. For this reason, for example, by detecting whether or not a display pixel group arranged in one row (equal to y) or one column (equal to x) of two-dimensional coordinates (XY coordinates) includes a defective pixel, the defective pixel is detected. A defective pixel can be specified, for example, the coordinates of the intersection of the included row and column become the coordinates of the defective pixel. In addition, since the luminance level is determined, the inspection can be performed according to the inspection standard. In addition, it is possible to devise a device such as differentiating a product (a product having a sample display screen: a display device) in accordance with the luminance level, which can contribute to a reduction in the price of the product (display device).

A display screen inspection method according to a third aspect of the present invention is a display screen inspection method for specifying coordinates of a defective pixel in a display screen displaying each display pixel corresponding to each display element arranged in a matrix. In the state where the defective pixel is captured in the field of view of the imaging means, each divided screen obtained by dividing the display screen into a plurality of pieces is individually displayed, a divided screen overlapping with the field of view is determined, and the divided screen is displayed. A rough coordinate range detecting step of detecting a coordinate range as a rough coordinate range, and a display pixel group scanned and displayed in each direction of the two-dimensional coordinates of the matrix within the rough coordinate range, within a visual field of the imaging means. And determining the coordinates of the defective pixel by searching for a display pixel group including the defective pixel.

In this display screen inspection method, the coordinates of the defective pixel are specified while the defective pixel in the display screen is captured in the field of view of the imaging means. In this case, the split screen is displayed individually,
A divided screen overlapping with the field of view of the imaging means is determined, the coordinate range is detected as a rough coordinate range, and a display pixel group scanned and displayed in each direction of the two-dimensional coordinates of the matrix is captured in the rough coordinate range. The display pixel group including the defective pixel is searched for within the field of view of the means. In this case, since the coordinates are narrowed to within the approximate coordinate range, the search range can be reduced (narrowed), the coordinates can be specified quickly and accurately, and the defective pixels can be captured. Means can be adopted. In addition, the current position of the imaging unit can be determined (understood) in reverse from the coordinate range of the divided screen overlapping the field of view, and the mechanism for position control can be inexpensive and simple.

Further, in the display screen inspection method according to claim 3, in the defective pixel coordinate specifying step, a search result obtained by searching the approximate coordinate range is stored, and the specifying of the coordinates of the defective pixel is performed by the general method. It is preferable that the search is performed based on the stored search result after performing the entire search within the coordinate range.

In this display screen inspection method, a search result obtained by searching within the approximate coordinate range is stored, and thereafter, at any time in accordance with processing convenience, based on the stored search result, The coordinates of the defective pixel can be specified.

According to a fifth aspect of the present invention, there is provided a display screen inspection method, wherein a defective pixel in a display screen displaying each display pixel corresponding to each display element arranged in a matrix is captured in a visual field of an image pickup means. A display screen inspection method for specifying the coordinates of the defective pixel, wherein the display screen is divided into n (n is a natural number of 2 or more), each divided screen is individually displayed, and the defective pixel is captured. A first coordinate range searching step of determining a divided screen overlapping with the field of view of the imaging means and detecting a coordinate range of the divided screen as a first coordinate range; and further dividing the divided screen having the first coordinate range into n pieces Divided and individually displayed as each second divided screen, and a second
A second coordinate range searching step of determining the divided screen and detecting the coordinate range of the second divided screen as the second coordinate range; and searching the second coordinate range to specify the coordinates of the defective pixel. Defective pixel coordinate specifying step.

In this display screen inspection method, when a defective pixel is present in the display screen, n defective display pixels are captured in the field of view of the imaging means (n is a natural number of 2 or more). The search range of coordinates is narrowed down to the coordinate range (first coordinate range) of the divided screen divided into, and the search range is further narrowed down to the coordinate range (second coordinate range) of the divided screen further divided into n. Therefore, the search range may be small (narrow), and the search range may be limited to n (n is a natural number of 2 or more) divided screen coordinate ranges (first coordinate range). The coordinates can be quickly and accurately specified from the narrowed state. By repeating the same n divisions in the same manner, the search range can be narrowed by the number of factorials of n (ultimately, up to one coordinate).

Further, the display screen inspection apparatus of the present invention captures a defective pixel in a display screen which displays each display pixel corresponding to each display element arranged in a matrix in a visual field of an image pickup means. A display screen inspection apparatus for specifying the coordinates of the defective pixel, wherein the image pickup means and a visual field for detecting coordinates in the visual field of the defective pixel when a reference point in the visual field defined in the visual field is used as an origin. Coordinate detection means, a display pixel in the display screen, by scanning in each direction of the two-dimensional coordinates of the matrix and displaying, by detecting in-field reference point detection means for detecting the coordinates of the in-field reference point, Defective pixel coordinate specifying means for specifying the coordinates of the defective pixel in the display screen based on the coordinates of the reference point in the visual field and the coordinates in the visual field.

In this display screen inspection apparatus, the coordinates in the visual field of the defective pixel when the reference point in the visual field defined in the visual field is set as the origin, and the coordinates (in the display screen) of the reference point in the visual field. In this case, the coordinates of the defective pixel in the display screen are specified. Therefore, when an imaging unit capable of quickly detecting (specifying) the defective pixel in the field of view is used, it is utilized to more quickly and accurately detect the defective pixel. The coordinates can be specified.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a display screen inspection apparatus, a display screen inspection method, and a display screen inspection system to which the display screen inspection method according to one embodiment of the present invention is applied will be described.
This will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the display screen inspection system 1 includes a display screen inspection apparatus and an LCD panel 14 serving as a sample of the display screen inspection apparatus. An image pickup means (hereinafter simply referred to as a “CCD camera”) C comprising a camera; an image output device 12 for outputting an image (output of a drive signal) to a display screen D of an LCD panel 14; An image recognition device 13 for capturing as image data, image data (captured image data: input image data) of the image capture result is captured and processed, and a display image instruction (output image data) is given to the image output device 12. A control device 11 for controlling the entire display screen inspection system 1.

Here, the field of view Ce of the CCD camera C is
As shown in FIG. 2B, the display screen is smaller than the display screen D of the LCD panel 14. In this case, the resolution (resolution) may be such that the presence or absence of the defective pixel Pd (illustrated by “★”) can be determined, and by moving each part of the display screen D while capturing an image, the entire display screen D can be moved. Inspection is also possible. Conversely, since the coordinates [x, y] of the defective pixel Pd can be determined (specified) by the method described below, there is no need for a resolution capable of determining the coordinates [x, y] in detail here. An inexpensive CCD camera (inexpensive imaging means) C can be employed. Also, here, the CCD camera C
(Operator, user) is moved manually (handheld). Therefore, no special moving mechanism is required.

The display screen D of the LCD panel 14 serving as a sample actually covers a screen of one million pixels or more. However, for the sake of simplicity, FIG. Thus, 15 pixels in the X direction (x = 0 to
14 pixels (15 pixels), 5 pixels in the Y direction (5 pixels of y = 0 to 4) (the light-emitting (display) state of each pixel (each pixel) is “□”, the extinction state is “Δ”, and the display is The defective state is indicated by “★”). For this reason, in the display screen D here, each pixel corresponding to the light emitting (display) element arranged in a 15 × 5 matrix is displayed (display screen D).
Is shown as a screen D1 or the like, and in the description, only the reference numeral is attached as (D1) or the like).

Further, as shown in FIG.
By dividing the display screen D of the matrix (coordinates) into a plurality (here, two on the left and right), a plurality of (two) divided screens each having a predetermined coordinate range can be set and individually displayed. . That is, in the present example, the screen is divided into two on the left and right sides, and the divided screen DL on the left side of the drawing having the coordinate ranges [0, 0] to [7, 4], and the coordinate ranges [8, 0] to [1]
4, 4], the divided screen DL and the divided screen D are set as shown in the figure.
R and R can be displayed independently of each other.

An inspection method (display screen inspection method) in the display screen inspection system 1 will be described with reference to FIG.
This will be described below. In this inspection method, first, FIG.
As shown in (1), a defective pixel Pd is found (D1). In this case, if the resolution (resolution) or the like allows the defective pixel Pd to be found, the defective pixel Pd may be found by directly observing the display screen D of the LCD panel 14 or in cooperation with the control device 11 (FIG. The display (monitor) (outside) may be found by the inspector as if looking into the microscope. In addition, CCD
The control device 11 may automatically determine the presence of the defective pixel Pd based on the image data from the camera C.

Next, as shown in FIG. 2B, the defective pixel Pd is captured in the field of view Ce of the CCD camera C, and the presence thereof is imaged so that its existence can be discriminated (D2). Next, the divided screen DL and the divided screen DR are individually displayed, and the divided screen overlapping with the visual field Ce is determined. For example, as shown in FIG. 3C, when the divided screen DR is individually displayed and the defective pixel Pd can be imaged in the field of view Ce, it is determined to be the right divided screen DR, and the divided screen DR is displayed. Coordinate range [8,
0] to [14, 4] are set as a rough coordinate range (D3). That is, at this point, the coordinates of the defective pixel Pd have been narrowed down to within the approximate coordinate range.

Next, as shown in FIG.
For each of = 0 to 4, each row of display elements is caused to emit light (display), and the coordinates (Y address) of Y when the defective pixel Pd exists are detected (identified). In the case of this example, as shown in the figure, the Y coordinate (Y address) y = 2 of the defective pixel Pd
Is determined (specified). Subsequently, as shown in FIG. 8E, one row of display elements is displayed for each of the X coordinates x = 8 to 14 within the coordinate range (approximate coordinate range) of the divided screen DR, and the defective pixel Pd is displayed. Is detected (identified) when X is present (X address). In the case of this example, as shown in the figure, the X coordinate (X address) x = 1 of the defective pixel Pd
Decide (specify) 2 In addition, as shown in FIG. 3F, even if inspection (search) is performed one pixel at a time in the approximate coordinate range, it is a small (narrow) range. Thus, the coordinates can be specified much more quickly and accurately. Therefore, once the defective pixel Pd
After specifying the coordinates, the method shown in FIG. 6F can be performed for verification.

As described above, in the display screen inspection method of the present embodiment, a part of the display screen D is imaged by the CCD camera (imaging means) C so that the presence or absence of the defective pixel Pd can be determined. For this reason, if each part of the display screen D is moved while capturing an image, the inspection of the entire display screen D can be performed. In this case, the field of view Ce of the CCD camera C may be smaller than the display screen D, and its resolution (resolution) is the defective pixel Pd
Since it is sufficient that the presence or absence can be determined, an inexpensive one can be adopted.

Further, since the divided screen obtained by dividing the display screen D can be individually displayed, it is possible to determine the divided screen which overlaps the visual field Ce. In this case, the imaging target is the displayed portion,
Since the coordinate range of the divided screen overlapping with the field of view Ce is the imaging range in the state (position) at that time, if the divided screen can be determined, the current position of the CCD camera C can be determined (understand) from the coordinate range. That is, there is no need to always accurately grasp the position of the CCD camera C itself, and rough position control including manual movement can be performed. Therefore, in short, hand-held movement as in the above-described example may be used. No mechanism is required, or an inexpensive and simple configuration is sufficient.

When the defective pixel Pd exists in the visual field Ce, the coordinate range of the divided screen overlapping the visual field Ce is detected as a rough coordinate range, and the rough coordinate range is searched.
The coordinates Pd of the defective pixel are specified. In this case, the defective pixel P
Since the coordinates of d are narrowed down to the approximate coordinate range at the time when the presence of the defective pixel Pd is detected, the search range is small (narrow), and accordingly, the search is performed by using the entire display screen D as a range. The coordinates can be specified quickly and accurately. Therefore, the defective pixel Pd is detected quickly and accurately with a cheap and simple configuration and its coordinates (for example, coordinates [x, y] = [1
2, 2]). Further, in the above example, in a state where the defective pixel Pd is captured within the visual field Ce of the CCD camera C,
Since the individual display of each of the divided screens DL and DR, the determination of the overlapped divided screen, and the detection of the approximate coordinate range are performed, it is possible to quickly and accurately detect the defective pixel and shift to the coordinate specification.

It is also possible to search the approximate coordinate range and store the search result. In this case, if the search result is stored, the stored result is stored at an arbitrary point in time according to processing convenience. The coordinates of the defective pixel Pd can be specified based on the search result. Further, in the above example, the number of divided screens is simply two on the left and right, but any number may be used as long as the division is based on a matrix (coordinates) of pixels. That is, four, six
, Eight or an odd number, and the divided screens may have different sizes as in this example, or may be the same.
In these cases, each split screen can be individually displayed by displaying the display element of each split screen independently of the other split screens. When a plurality of divided screens are determined as divided screens overlapping with the field of view Ce, the current position of the CCD camera C is a position straddling the boundary between the plurality of divided screens.

Further, in the above-described example, the coordinate range to be searched is narrowed down by the first division number (two in the above-mentioned example) to form a rough coordinate range. For example, first (first time), the display screen is changed to n. The search range of coordinates is narrowed down to the coordinate range (first coordinate range) of the divided screen divided into pieces (n is a natural number of 2 or more), and the next (second time) coordinates obtained by further dividing the divided screen into n pieces The search range may be narrowed down to a range (second coordinate range). In this case, the search range can be further reduced (narrower), and the coordinate range of the n (n is a natural number equal to or greater than 2) divided screen (first coordinate range) can be obtained. ), The coordinates can be specified quickly and accurately. By repeating the same n divisions in the same manner, the search range can be narrowed by the number of factorials of n (ultimately, up to one coordinate).

Further, in the above example, only the presence or absence and the position of the defective pixel are considered. However, each pixel can be classified into a plurality of pixels based on the luminance level. In addition, a device having a predetermined criterion (for example, a criterion for brightness) or more may be determined to be OK (for example, a product including a display element of this type is discounted) without complete emission (display). Various inspection standards can be determined according to circumstances. In this case, the approximate coordinate range (in the above example, the divided screen DR
The brightness level of each pixel within the (coordinate range of) can be detected and stored, and after all the detections, the determination by function (by ability) as a display screen can be performed. As a result, an inspection according to the inspection standard can be performed. In addition, it is possible to devise a device such as differentiating a product (a product having a sample display screen: a display device) in accordance with the luminance level, which can contribute to a reduction in the price of the product (display device).

In the above-described embodiment, the CCD camera (imaging means) C is manually moved by the operator. However, the CCD camera C is also operated manually, for example, like operating a mouse or a trackball. May be moved. Further, after detecting the presence of the defective pixel, a moving mechanism for automatically moving the defective pixel to a position within the visual field may be provided. In these cases, when a defective pixel exists in the display screen, the imaging unit can be moved to a position where the defective pixel is captured in the field of view, and the defective pixel is captured in the field of view of the imaging unit. Since the coordinates of the defective pixel are specified, it is possible to quickly and accurately detect the defective pixel and specify the coordinates.

In the above example, the coordinate range of the divided screen overlapping the field of view Ce of the CCD camera C is detected as the approximate coordinate range, and the approximate coordinate range is searched to identify the coordinates Pd of the defective pixel. When the defective pixel is captured in the visual field Ce, the coordinates of the defective pixel in the visual field Ce (coordinates in the visual field)
If can be specified, the coordinates can be specified more quickly.

For example, as shown in FIG. 2, a reference point (reference point in the field of view) Cb is defined in (for example, the position of an end of) the field of view Ce, and the coordinates of the defective pixel Pd in the field of view (shown in FIG. In the example of (1), a CCD that can instantaneously specify the coordinates [1, 2] when the reference point Cb in the visual field is set to the coordinates [0, 0]
When the camera C is used, the coordinates of the reference pixel Cb in the visual field (coordinates [11, 0] in the drawing) on the display screen D are simply detected (identified), and the coordinates of the defective pixel Pd captured in the visual field Ce are detected. (Coordinates [12, 2] shown) can be quickly specified. That is, regardless of the coordinates of the defective pixel Pd captured in the field of view Ce, the coordinates of the reference point Cb in the field of view (for example, the coordinates of the end of the field of view Ce) need only be specified, so that the specification can be performed more quickly.

Further, in the above-described embodiment, an example of the display screen of the LCD panel has been described.
The present invention can be similarly applied to a display screen that displays each display pixel corresponding to each display element arranged in a matrix, such as an L display. Further, changes can be made as appropriate without departing from the spirit of the present invention.

[0036]

As described above, according to the display screen inspection apparatus and the display screen inspection method of the present invention, it is possible to quickly and accurately detect a defective pixel and specify its coordinates with an inexpensive and simple configuration. effective.

[Brief description of the drawings]

FIG. 1 is a block diagram of a display screen inspection system to which a display screen inspection apparatus, a display screen inspection method, and a display screen inspection method according to an embodiment of the present invention are applied.

FIG. 2 is an explanatory diagram showing an example of a display screen inspection method in the display screen inspection system 1 of FIG.

[Explanation of symbols]

 Reference Signs List 1 display screen inspection system 11 control device 12 image output device 13 image recognition device 14 LCD panel (display device) C CCD camera Cb reference point in visual field Ce visual field D, D1 to D6 ... display screen

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G051 AA73 AB07 AC02 CA04 EB01 ED08 ED23 2G086 EE10 2H088 FA13 FA30 5B057 BA02 CA12 CA16 DA03

Claims (6)

[Claims] 1. A display in which a defective pixel in a display screen for displaying each display pixel corresponding to each display element arranged in a matrix is captured in a field of view of an image pickup means and coordinates of the defective pixel are specified. A screen inspection apparatus, wherein: the imaging unit; a divided screen display unit that divides the display screen into a plurality of parts and individually displays each divided screen; and a divided screen that overlaps a field of view of the imaging unit that captures a defective pixel. Is determined based on the individual display, and a rough coordinate range detecting means for detecting a coordinate range of the divided screen as a rough coordinate range;
A defective pixel coordinate specifying means for searching for the defective pixel in the visual field of the imaging means and specifying the coordinates by scanning and displaying in each direction of the dimensional coordinates. Inspection equipment. 2. The defective pixel coordinate specifying means, when displaying a divided screen overlapping the visual field, sets a display pixel group that does not satisfy a luminance level defined by an inspection standard as a display pixel group including the defective pixel. The display screen inspection apparatus according to claim 1, further comprising a pixel group luminance level determination unit for detecting. 3. A display screen inspection method for identifying coordinates of a defective pixel in a display screen displaying each display pixel corresponding to each display element arranged in a matrix, comprising: In a state captured in the field of view, each divided screen obtained by dividing the display screen into a plurality is individually displayed,
A rough coordinate range detecting step of determining a divided screen overlapping with the field of view and detecting a coordinate range of the divided screen as a rough coordinate range, and scanning in each direction of the two-dimensional coordinates of the matrix within the rough coordinate range. A defective pixel coordinate identifying step of identifying a coordinate of the defective pixel by capturing a display pixel group displayed in the visual field of the imaging unit and searching for a display pixel group including the defective pixel. A display screen inspection method, characterized in that: 4. In the defective pixel coordinate specifying step, a search result obtained by searching the approximate coordinate range is stored, and the specification of the coordinates of the defective pixel is stored after performing a full search within the approximate coordinate range. The display screen inspection method according to claim 3, wherein the method is performed based on the search result. 5. A display in which a defective pixel in a display screen displaying each display pixel corresponding to each display element arranged in a matrix is captured in a field of view of an image pickup means and coordinates of the defective pixel are specified. A screen inspection method, wherein the display screen is divided into n (n is a natural number of 2 or more), each divided screen is individually displayed, and a divided screen overlapping with a field of view of the imaging unit capturing a defective pixel is displayed. A first coordinate range retrieving step of determining and detecting the coordinate range of the divided screen as a first coordinate range; and further dividing the divided screen having the first coordinate range into n pieces to form each second divided screen. A second coordinate range retrieving step of individually displaying and determining a second divided screen overlapping with the field of view of the imaging means, and detecting a coordinate range of the second divided screen as a second coordinate range; To find the coordinates of the defective pixel. A display pixel inspection method, comprising: 6. A display in which a defective pixel in a display screen for displaying each display pixel corresponding to each display element arranged in a matrix is captured in a field of view of an image pickup means and coordinates of the defective pixel are specified. A screen inspection device, wherein the imaging unit; an in-view coordinate detecting unit that detects an in-view coordinate of the defective pixel when an in-view reference point defined in the view is set as an origin; An in-view reference point detecting means for detecting and displaying the display pixels in each direction of the two-dimensional coordinates of the matrix to detect the coordinates of the in-view reference point; A display screen inspection device, comprising: defective pixel coordinate specifying means for specifying the coordinates of the defective pixel in the display screen based on the internal coordinates.