Image measuring device

Abstract

An image measuring device includes: a base, on which a display panel is installed; an image acquisition unit, which captures the display surface of the display panel to obtain an image displayed by the display panel; an image reflection unit, which reflects the image of the display panel to the image acquisition unit; and an image analysis unit, which analyzes at least one of the color and brightness of the image obtained according to the angle at which the image is reflected to determine the viewing angle characteristics of the display panel. The image acquisition unit simultaneously obtains images corresponding to multiple reflection angles by capturing images once. The image acquisition unit includes: a camera, which uses light vertically incident from a target portion of the display surface to obtain a first image, and uses light reflected from the target portion to the image reflection unit to obtain a second image.

Description

Technical Field

[0001] The present invention relates to an inspection system for a display device, and more particularly to an image measuring apparatus and an image measuring system. Background Art

[0002] The image measuring device captures an image displayed on a display device (display panel) and optically analyzes the captured image. The image measuring device generates image data analyzed for brightness, color, etc., and can correct pixel defects, image deviation, etc. based on the analyzed image data.

[0003] An image output from an image measuring device that captures an image of a flat display surface using a single lens of a camera will inevitably have deviations in image characteristics due to a difference in viewing angle in the remaining area except for the central portion of the image. Summary of the invention

[0004] An object of the present invention is to provide an image measuring device for obtaining image characteristics at multiple viewing angles through a single imaging operation.

[0005] However, the purpose of the present invention is not limited to the above-mentioned purpose, and various extensions can be made without departing from the concept and purpose of the present invention.

[0006] In order to achieve an object of the present invention, an image measuring device according to an embodiment of the present invention may include: a base, on which a display panel is installed; an image acquisition unit, which captures a display surface of the display panel to obtain an image displayed by the display panel; an image reflection unit, which reflects the image of the display panel to the image acquisition unit; and an image analysis unit, which analyzes at least one of the color and brightness of an image obtained according to the angle at which the image is reflected to determine the viewing angle characteristics of the display panel. The image acquisition unit can simultaneously obtain images corresponding to multiple reflection angles by capturing an image once.

[0007] According to one embodiment, the image acquisition unit may include a camera that acquires a first image using light vertically incident from a target spot of the display surface, and acquires a second image using light reflected from the target spot to the image reflection unit.

[0008] According to one embodiment, the image reflecting unit may include at least one mirror component disposed within the field of view of the camera.

[0009] According to an embodiment, the at least one reflector component may be a total reflector including a flat reflective surface.

[0010] According to one embodiment, the total reflection mirror may reflect the light of the image of the target part toward the image acquisition unit.

[0011] According to one embodiment, the impact analysis unit may determine the angle between a vertical axis and a light path incident from the target portion to the at least one reflector component as a viewing angle relative to the display panel, wherein the vertical axis is a vertical axis between the target portion and the camera.

[0012] According to one embodiment, the image analysis unit may include: a characteristic detection unit, analyzing the spectral tristimulus values ​​of the first image and the second image to detect image characteristics including brightness and color information; and a viewing angle characteristic determination unit, comparing the first image characteristic of the first image with the second image characteristic of the second image to determine the viewing angle characteristic of the second image relative to the first image.

[0013] According to one embodiment, the impact analysis unit may further include an image correction unit that generates a correction parameter reflecting the optical characteristics of the reflector component and provides the correction parameter to the viewing angle characteristic determination unit.

[0014] According to an embodiment, the viewing angle characteristic determination unit may apply the correction parameter to the second image characteristic, and compare the second image characteristic to which the correction parameter has been applied with the first image characteristic.

[0015] According to an embodiment, the camera may further obtain a third image, where the third image is a 2D image including the entire display surface of the first image.

[0016] According to an embodiment, the characteristic detection unit may detect the image characteristic of the third image. The image analysis unit may further include an offset determination unit that compares the first image characteristic with the third image to calculate an image offset applied to an area of ​​the display panel other than the target portion.

[0017] According to an embodiment, the first image may be an image of a front viewpoint of the target part, and the second image may be an image of a side viewpoint corresponding to a pre-set viewing angle of the target part.

[0018] According to an embodiment, the at least one reflector component may include a first reflector component and a second reflector component that are arranged opposite to each other.

[0019] According to one embodiment, the image acquisition unit can generate: a front viewpoint image of the entire display surface that is not reflected by the first reflector component and the second reflector component; a first side viewpoint image of the entire display surface obtained by using light whose total reflection number is an odd number of times reflected by the first reflector component and the second reflector component; and a second side viewpoint image of the entire display surface obtained by using light whose total reflection number is an even number of times reflected by the first reflector component and the second reflector component.

[0020] According to an embodiment, the first side viewpoint image may be an image flipped left-right relative to the front viewpoint image and the second side viewpoint image based on the configuration positions of the first reflector component and the second reflector component.

[0021] According to one embodiment, the image analysis unit may respectively compare the image characteristics of a pre-set first target part of the front viewpoint image, the image characteristics of a pre-set second target part of the first side viewpoint image, and the image characteristics of a pre-set third target part of the second side viewpoint image, and determine the viewing angle characteristics corresponding to the first side viewpoint image and the second side viewpoint image.

[0022] According to one embodiment, the at least one reflector component may further include: a curved reflector component for reflecting light vertically emitted from the display surface toward the image acquisition portion.

[0023] According to one embodiment, the image acquisition unit can generate: a first front viewpoint image of the entire display surface that is not reflected by the first reflector component, the second reflector component, and the curved reflector component; a side viewpoint image of the entire display surface that is reflected by the first reflector component and one of the second reflector components; and a second front viewpoint image that is reflected by the curved reflector component.

[0024] According to an embodiment, the image analysis unit may compare the image characteristics of the first front viewpoint image with the image characteristics of the second front viewpoint image to determine the viewing angle characteristics.

[0025] According to an embodiment, the image measuring device may further include: an image generating unit, which generates a test image with a preset grayscale and provides the test image to the display panel.

[0026] (Effects of the Invention)

[0027] The image measuring device according to the embodiment of the present invention includes a plurality of reflector components, and can obtain not only the front viewpoint image but also the side viewpoint images corresponding to the plurality of viewpoints through a single camera shot. Thus, the time for measuring and compensating the viewpoint characteristics of the viewpoint of the display panel can be greatly shortened, and the process time can be shortened. Thus, the manufacturing cost of the display device can be reduced.

[0028] In addition, by comparing and analyzing the obtained images, the image characteristics (viewing angle characteristics) at different viewing angles can be calculated more accurately. Therefore, by applying such viewing angle characteristics to the design and driving of the display device, the image quality can be improved.

[0029] However, the effects of the present invention are not limited to the above-mentioned effects, and various extensions can be made without departing from the concept and gist of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 2 is a diagram showing a vision measuring device according to an embodiment of the present invention.

[0031] Figure 2 It is shown Figure 1 A diagram of an example of an image measuring device.

[0032] Figure 3 It is shown Figure 1 A block diagram of an example of an image analysis unit included in an image measuring device.

[0033] Figure 4 It is shown Figure 1 A diagram of an example of an image measuring device.

[0034] Figure 5 It is shown Figure 1 A diagram of an example of an image measuring device. DETAILED DESCRIPTION

[0035] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and repeated descriptions of the same components are omitted.

[0036] Figure 1 2 is a diagram showing a vision measuring device according to an embodiment of the present invention.

[0037] Reference Figure 1 The image measuring device 1000 may include a base, an image obtaining unit 100 , an image reflecting unit 200 , and an image analyzing unit 300 . In one embodiment, the image measuring device 1000 may further include an image generating unit 400 .

[0038] The image measuring device 1000 can capture an image displayed on the display panel 10 and analyze the captured image to understand the image characteristics of the display panel 10. Furthermore, the image measuring device 1000 can generate an image correction value or correction parameter based on the analyzed image.

[0039] The image acquisition unit 100 can capture the display surface of the display panel 10. The image acquisition unit 100 can acquire the image displayed by the display panel 10. The display panel 10 can be installed and fixed on a predetermined base.

[0040] The image acquisition unit 100 may include a camera or an image sensor. For example, the camera includes a single lens, which may be vertically arranged on the display surface of the display panel 10. However, this is exemplary, and the configuration of the image acquisition unit 100 is not limited thereto. For example, the image acquisition unit 100 may include a sensor that detects an image of the display surface in a variety of ways.

[0041] The camera of the image acquisition unit 100 has a predetermined observation field of view FOV, and can generate and output an image of an area corresponding to the observation field of view FOV. That is, the observation field of view FOV of the camera is larger than the display surface of the display panel 10. Thus, not only the image of the display surface but also the image of the area included in the observation field of view FOV can be output. The farther away from the camera, the wider the observation field of view FOV.

[0042] In one embodiment, the camera of the image acquisition unit 100 can obtain a first image using light vertically incident from the target part TS of the display surface to the lens, and can obtain a second image using light reflected from the target part TS by the image reflection unit 200 and incident. That is, the first image and the second image are images corresponding to the target part TS, respectively. In addition, the image acquisition unit 100 can further obtain a 2D image of the entire display surface, that is, a third image. For example, light directly emitted from the display surface and light reflected from the image reflection unit 200 can be collected by the lens and provided to the image acquisition unit 100.

[0043] The image acquisition unit 100 may provide the image analysis unit with image data IMG including the first image to the third image. In one embodiment, the image data IMG may include: all image information within the observation field of view FOV. In addition, the image data IMG may also be displayed on the screen for image analysis in the form of a 2D photo.

[0044] On the other hand, the image characteristics under different viewing angles of the user of the display panel 10 are important factors in the display characteristics. Depending on the user's viewpoint (for example, the positional relationship between the user and the display device), the image displayed on the display device may be recognized as different. For example, the image of the front viewpoint is recognized by propagating at a relatively small angle relative to the light emitted vertically from the pixel, while the image of the side viewpoint is recognized by propagating at a relatively large angle relative to the light emitted vertically from the pixel. As a result, the range (area) of one pixel for recognizing the image of the side viewpoint will be smaller than that of the image of the front viewpoint, and the brightness of the image of the side viewpoint may be recognized as lower than the brightness of the image of the front viewpoint.

[0045] Furthermore, the light path emitted from the pixel displaying the image of the front viewpoint is different from the light path emitted from the pixel displaying the image of the side viewpoint, and therefore, the image of the side viewpoint may be affected by light interference different from that of the image of the front viewpoint. For example, for the light emitted from the pixel, the light passing through the cover glass and the like and the light reflected again may be recognized through constructive interference or destructive interference. At this time, the constructive interference or destructive interference of light may be deepened in the image of the side viewpoint compared to the image of the front viewpoint. This constructive interference and destructive interference of light may differ depending on the wavelength of light, and thus, the color of the image of the side viewpoint may be recognized as different from that of the image of the front viewpoint. For example, when white light is emitted from the display device, white light is recognized on the front, while on the side, due to the wavelength drift caused by the difference in the light path, a change in color tone such as greenish, bluish, or reddish may be recognized.

[0046] In other words, the brightness and color of the same image may be recognized differently depending on the side viewing angle. Therefore, it is necessary to analyze the viewing angle characteristics of the image recognized differently depending on the viewing angle.

[0047] With existing image measurement devices, it is not possible to simultaneously obtain the information of the front viewpoint image and the image characteristic data at different viewing angles by taking a single image of the display panel. That is, for the same image, the viewing angle characteristics can only be calculated using the data obtained by taking multiple images at multiple angles.

[0048] However, the image measuring device 1000 according to the embodiment of the present invention includes the image reflecting unit 200 disposed within the observation field of view FOV, so that the front viewpoint data and the view angle characteristics VAD under various view angles can be calculated through a single imaging operation.

[0049] The image reflecting unit 200 can reflect the image of the display panel 10 to the image obtaining unit 100. In one embodiment, the image reflecting unit 200 can reflect the image of the target site TS to be incident on the lens of the camera (the image obtaining unit 100).

[0050] The image reflecting unit 200 may include at least one reflector member disposed within the observation field of view FOV of the camera. Thus, the image reflected from the image reflecting unit 200 may be included in the image data IMG.

[0051] The reflector member may be a total reflector in the form of a plane reflector having a flat reflective surface. For example, the reflector member may be an optical reflector having a total reflectivity of 99% or more.

[0052] The reflector component can be arranged in the observation field of view FOV to form an appropriate angle with the camera lens and the target part TS so that the image of the target part TS is incident on the camera lens. The reflector component can play a function of transmitting the image of the side viewpoint of the display surface (i.e., the target part TS) (i.e., the image seen at a predetermined viewing angle) to the image acquisition unit 100.

[0053] In one embodiment, the plurality of reflector components may be respectively configured to correspond to a plurality of side viewing angles. Each reflector component may perform total reflection. Thus, the image acquisition unit 100 may simultaneously acquire images of the display panel 10 corresponding to a plurality of reflection angles (i.e., viewing angles) by photographing the object once.

[0054] The image analysis unit 300 may analyze at least one of the color and brightness of the image obtained according to the angle at which the image is reflected, and determine the viewing angle characteristic VAD of the display panel 10. The image analysis unit 300 may determine the angle between the vertical axis and the light path as the viewing angle of the display panel 10, wherein the vertical axis is the vertical axis between the target part TS and the camera, and the light path is the light path incident from the target part TS to the reflector component.

[0055] The image analysis unit 300 may include a colorimeter, a spectrometer, etc. that can perform optical analysis on the image data IMG. However, this is exemplary, and the image analysis unit 300 may include optical instruments, measuring instruments, etc. that can measure brightness information, color coordinate information, color temperature information, etc. according to the image data IMG in various ways.

[0056] In one embodiment, the image analysis unit 300 may further reflect the optical characteristics (e.g., light reflection, light refraction, light absorption characteristics) of the reflector component included in the image reflection unit 200 to the image data IMG. By analyzing the image data IMG to which the optical characteristics of the reflector component are applied, a more precise viewing angle characteristic VAD may be calculated. The viewing angle characteristic VAD may be provided to an external device such as a memory or a correction device.

[0057] The image generation unit 400 may generate a test image of a preset grayscale and provide it to the display panel 10. For example, the control unit included in the image analysis unit 300 may generate a control signal CON for controlling the operation of the image generation unit 400, and provide the control signal CON to the image generation unit 400. The image generation unit 400 may provide the display panel 10 with an image signal for calculating the viewing angle characteristic VAD and other image characteristics in response to the control signal CON.

[0058] As described above, the image measuring device 1000 according to the embodiment of the present invention uses multiple reflector components to obtain not only the front viewpoint image but also the side viewpoint images corresponding to multiple viewpoints through a single image capture. As a result, the time for measuring and compensating the viewpoint characteristics of the viewpoint of the display panel 10 can be greatly shortened, and the process time can be shortened.

[0059] Figure 2 It is shown Figure 1 A diagram of an example of an image measuring device.

[0060] Reference Figure 1 as well as Figure 2 The image measuring device 1000 includes an image reflecting unit 200 , which includes a plurality of reflecting mirror components MR1 ​​, MR2 , and MR3 . The image acquiring unit 100 can generate image data IMG including first to third images IM1 to IM3 .

[0061] The display panel 10 may be mounted on a predetermined base 600. The camera 120 may be disposed substantially vertically to the target portion TS of the display panel 10. For example, the target portion TS may be a region including a portion of pixels at the center of the display surface.

[0062] Figure 2 The image data IMG shown may include an image corresponding to the observation field of view FOV of the camera 120. The first image IM1 may be obtained using light (denoted as L0) vertically incident from the target part TS to the camera 120. The first image IM1 is an image under the condition of a viewing angle of 0°, which may be a front viewpoint image.

[0063] The entire image of the display surface of the display panel 10 may be obtained as the third image IM3. In one embodiment, the third image IM3 may include the first image IM1.

[0064] The image reflecting unit 200 may include first to third reflective mirror components MR1 ​​to MR3. The first to third reflective mirror components MR1 ​​to MR3 may be respectively disposed within the observation field of view FOV.

[0065] The second image IM2 may be an image of the target site TS obtained using light reflected from the image reflecting portion 200. The second image IM2 may include a 2-1st image IM2-1, a 2-2nd image IM2-2, and a 2-3rd image IM2-3 corresponding to the first to third reflective mirror components MR1 ​​to MR3, respectively.

[0066] The first reflector component MR1 can reflect the first light L1 incident from the target part TS and provide it to the camera 120. The first light L1 can be a collection of light emitted to the first reflector component MR1 in the light of the image corresponding to the target part TS. Here, the angle between the vertical axis (for example, corresponding to L0) and the light path can be determined as the first viewing angle A1, wherein the vertical axis is the vertical axis between the target part TS and the camera 120, and the light path is the light path incident from the target part TS to the first reflector component MR1. That is, the first reflector component MR1 is configured to correspond to the first viewing angle A1, and the 2-1st image IM2-1 obtained by reflection of the first reflector component MR1 can be determined as the image of the target part TS viewed from the first viewing angle A1. For example, the first viewing angle A1 can correspond to about 15°.

[0067] On the output screen of the image data IMG, the 2-1st image IM2 - 1 may be correspondingly generated on the extension line of the optical path provided from the first mirror member MR1 to the camera 120 .

[0068] The second reflector component MR2 can reflect the second light L2 incident from the target part TS and provide it to the camera 120. The second reflector component MR2 is configured to correspond to the second viewing angle A2, and the 2-2nd image IM2-2 obtained by the reflection of the second reflector component MR2 can be determined as the image of the target part TS viewed from the second viewing angle A2. For example, the second viewing angle A2 can correspond to about 30°.

[0069] The third reflector component MR3 can reflect the third light L3 incident from the target part TS and provide it to the camera 120. The third reflector component MR3 is configured to correspond to the third viewing angle A3, and the second-third image IM2-3 obtained by the reflection of the third reflector component MR3 can be determined as the image of the target part TS viewed from the third viewing angle A3. For example, the third viewing angle A3 can correspond to about 60°.

[0070] Figure 2 FIG. 2 shows that the image reflecting unit 200 includes three reflector components, but the number of the reflector components is not limited thereto. In addition, the position and angle of the reflector components can be adjusted according to the desired viewing angle.

[0071] on the other hand, Figure 2, the reflector component is arranged on one side relative to the display panel 10, but the position of the reflector component is not limited to this. For example, the reflector component can also be arranged on the left and right sides of the display panel 10 corresponding to the second viewing angle A2. In this case, images of the target part TS observed from multiple directions for the same viewing angle can be obtained. Thus, the viewing angle characteristics VAD in multiple directions corresponding to the same viewing angle can be measured and calculated.

[0072] As described above, the image measuring device 1000 according to the embodiment of the present invention includes the first to third reflector components MR1 ​​to MR3, so that not only the front viewpoint image but also the side viewpoint images corresponding to multiple viewpoints can be obtained through a single image capture. Thus, the time for measuring and compensating the viewpoint characteristics of the viewpoint of the display panel 10 can be greatly shortened, and the process time can be shortened.

[0073] Figure 3 It is shown Figure 1 A block diagram of an example of an image analysis unit included in an image measuring device.

[0074] Reference Figures 1 to 3 The image analysis unit 300 may include a characteristic detection unit 320 and a viewing angle characteristic determination unit 340. The image analysis unit 300 may also include an image correction unit 360 and an offset determination unit 380.

[0075] The characteristic detection unit 320 can detect the image characteristics IC1 to IC3 of the first image IM1 to the third image IM3 from the image data IMG. In one embodiment, the characteristic detection unit 320 can analyze the spectral tristimulus values ​​of the first image IM1 and the second image IM2 to detect the first image characteristic IC1 and the second image characteristic IC2 including information on brightness and color. The first image characteristic IC1 may include brightness and color information of the first image IM1.

[0076] exist Figure 3 In the description, it is assumed that the second image characteristic IC2 is an image characteristic corresponding to the 2-1st image IM2-1. The second image characteristic IC2 may include brightness and color information of the 2-1st image IM2-1.

[0077] In one embodiment, the characteristic detection unit 320 may include a colorimeter, a spectrometer, etc., which can perform optical analysis on the first image IM1 to the third image IM3 .

[0078] The viewing angle characteristic determination unit 340 may receive the first image characteristic IC1 and the second image characteristic IC2 provided by the characteristic detection unit 320. The viewing angle characteristic determination unit 340 may compare the first image characteristic IC1 and the second image characteristic IC2 to determine the viewing angle characteristic VAD of the second image IM2 with respect to the first image IM1. For example, the brightness difference between the first image IM1 and the second image IM2 and the measured grayscale difference may be calculated as the viewing angle characteristic VAD based on the first image characteristic IC1.

[0079] In one embodiment, the image correction unit 360 may generate a correction parameter CP reflecting the optical characteristics of the reflector component. For example, the image correction unit 360 may generate a correction parameter CP reflecting the optical characteristics of the first reflector component MR1. The flatness, reflectivity, etc. of the surface may vary depending on the reflector component. In addition, the reflectivity of different reflector components at different wavelengths may also be different. The image correction unit 360 may generate a correction parameter CP reflecting the optical characteristics of such a reflector component. The correction parameter CP may be provided to the viewing angle characteristic determination unit 340.

[0080] The viewing angle characteristic determination unit 340 may apply the correction parameter CP to the second video characteristic IC2 , thereby correcting the second video characteristic IC2 and calculating the viewing angle characteristic VAD more accurately.

[0081] In one embodiment, the viewing angle characteristic determination unit 340 may perform interpolation processing on the viewing angle characteristics VAD of preset viewing angles (eg, the first viewing angle A1 to the third viewing angle A3 ) to calculate the viewing angle characteristics VAD of all viewing angles.

[0082] Furthermore, viewing angle compensation based on viewing angle characteristic VAD can also be performed.

[0083] The bias determination unit 380 may receive the first image characteristic IC1 and the image characteristic of the third image IM3, that is, the third image characteristic IC3. Figure 2 As shown, a viewing angle may occur from the camera 120 to a portion of the display surface other than the target portion TS. Therefore, image deviation may occur in at least a portion of the third image IM3 due to the viewing angle difference.

[0084] The offset determination unit 380 can compare the third image IM3 with the first image characteristic IC1 and calculate the image offset OF of the portion different from the first image characteristic IC1. The image offset OF can be applied to the corresponding area of ​​the display surface. Thus, the viewing angle characteristic of the entire display surface can be compensated by the image characteristic under the front viewpoint.

[0085] As described above, the image analysis unit 300 calculates the viewing angle characteristics VAD under various viewing angles, thereby improving the image quality of the display device.

[0086] Figure 4 It is shown Figure 1 A diagram of an example of an image measuring device.

[0087] Figure 4 For reference Figure 2 as well as Figure 3 The same reference numerals are used for the components that have been described, and repeated description of such components will be omitted.

[0088] Reference Figure 3 as well as Figure 4 The image reflecting unit 200 may include a first reflecting mirror component MR1 and a second reflecting mirror component MR2 which are arranged opposite to each other.

[0089] The image acquisition unit 100 can generate a front viewpoint image FV1 of the entire display surface that is not reflected by the first reflector component MR1 and the second reflector component MR2. The front viewpoint image FV1 can be an image obtained when the viewing angle is assumed to be 0°. The front viewpoint image FV1 may include an image of a pre-set target portion TS, i.e., a first target portion image TS1. Here, the target portion TS may be an area virtually set on the display surface of the display panel 10. However, this is exemplary, and the target portion TS may include multiple target portions. In this case, the viewing angle characteristics VAD at different positions inside the display surface can be calculated.

[0090] The light emitted from the display surface may be reflected by the first reflector component MR1 and the second reflector component MR2 and then rush to the camera 120 .

[0091] The image acquisition unit 100 can generate an image of the entire display surface obtained by using light whose total number of reflections reflected by the first reflector component MR1 and the second reflector component MR2 is an odd number, that is, a first side viewpoint image SVI1. In one embodiment, the first side viewpoint image SVI1 can be generated using light (expressed as L2) reflected only by the first reflector component MR1. The first side viewpoint image SVI1 can be an image corresponding to the first viewing angle A1'. The first side viewpoint image SVI1 can include an image of the target part TS, that is, a second target part image TS2. The first side viewpoint image SVI1 can be an image flipped left and right with the front viewpoint image FVI based on the first reflector component MR1.

[0092] The image acquisition unit 100 can generate an image of the entire display surface obtained by using light whose total number of reflections reflected by the first reflector component MR1 and the second reflector component MR2 is an even number, that is, the second side viewpoint image SVI2. In one embodiment, the second side viewpoint image SVI2 can be obtained by using light (represented as L3) emitted from the display panel 10 and reflected by the second reflector component MR2, and then incident on the image acquisition unit 100 after being reflected by the first reflector component MR1. That is, the second side viewpoint image SVI2 is an image of the display surface generated after being reflected twice by the first reflector component MR1 and the second reflector component MR2. The first side viewpoint image SVI1 can be an image corresponding to the second viewing angle A2'. The first side viewpoint image SVI1 can include an image of the target part TS, that is, the third target part image TS3.

[0093] The image analysis unit 300 can measure (detect) the image characteristics of the first target part image TS1 to the third target part image TS3. The image analysis unit 300 can compare the image characteristics of the first target part image TS1 with the image characteristics of the second target part image TS2 to determine the viewing angle characteristic VAD corresponding to the first viewing angle A1'. Similarly, the image analysis unit 300 can compare the image characteristics of the first target part image TS1 with the image characteristics of the third target part image TS3 to determine the viewing angle characteristic VAD corresponding to the second viewing angle A2'.

[0094] Referenced Figure 3 The method of calculating the viewing angle characteristic VAD using the image data IMG has been described in detail, so repeated description is omitted.

[0095] Figure 4 The third side view image SVI3 and the fourth side view image SVI4 shown may correspond to images measured from directions different from the first side view image SVI1 and the second side view image SVI2. For example, the third side view image SVI3 may be an image obtained by observing the display panel 10 from a direction different from the third side view image SVI3 at the first viewing angle A1'.

[0096] The third side view image SVI3 may include the fourth target part image TS4, and the fourth side view image SVI4 may include the fifth target part image TS5. The viewing angle characteristic VAD of the third side view image SVI3 and the fourth side view image SVI4 may also be calculated by comparing with the first target part image TS1.

[0097] Figure 5 It is shown Figure 1 A diagram of an example of an image measuring device.

[0098] Figure 5 For reference Figures 2 to 4 The same reference numerals are used for the components that have been described, and repeated description of such components will be omitted.

[0099] Reference Figure 3 as well as Figure 5 The image reflecting unit 200 may include a first reflecting mirror component MR1 and a second reflecting mirror component MR2 disposed opposite to each other. The image reflecting unit 200 may also include a curved reflecting mirror component that reflects light vertically emitted from the display surface to the image obtaining unit.

[0100] In one embodiment, the image reflecting portion 200 may include a first curved reflective mirror component CMR1 and a second curved reflective mirror component CMR2.

[0101] The image acquisition unit 100 can generate a first front viewpoint image FVI1 of the entire display surface that is not reflected by the mirror members MR1, MR2, CMR1, and CMR2. The front viewpoint image FVI1 is an image assumed to be at a viewing angle of 0°.

[0102] In addition, the image acquisition unit 100 may generate a side viewpoint image SVI of the entire display surface obtained by being reflected by one of the first reflector member MR1 and the second reflector member MR2. The side viewpoint image SVI may be an image corresponding to the first viewing angle A1 ″.

[0103] On the other hand, except for the central area (or Figure 2 The remaining area outside the target area TS) may also have a viewing angle from the lens of the camera 120. Thus, the distortion caused by the viewing angle can be identified. For example, the light emitted from the predetermined first area AA of the display surface is not vertically incident on the camera 120. That is, Figure 5 As shown, there are viewing angles below the second viewing angle A2".

[0104] The first curved reflector component CMR1 can reflect the light vertically emitted from the first area AA and make it incident on the camera 120. Thus, the image acquisition unit 100 can generate a front viewpoint image of the first area AA, that is, a second front viewpoint image FVI2. In the output screen of the image data IMG, the second front viewpoint image FVI2 can be generated correspondingly on the extension line of the light path provided from the first curved reflector component CMR1 to the camera 120 in the observation field of view FOV.

[0105] Similarly, the second curved reflector component CMR2 can reflect the light vertically emitted from the second area BB and provide it to the camera 120. Thus, the image acquisition unit 100 can generate a front viewpoint image of the second area BB, that is, a third front viewpoint image FVI3. In the output screen of the image data IMG, the third front viewpoint image FVI3 can be generated correspondingly on the extension line of the light path provided from the second curved reflector component CMR2 to the camera 120 in the observation field of view FOV.

[0106] In one embodiment, the image analysis unit 300 can compare the side view image SVI and the first front view image FVI1 to determine the viewing angle characteristic VAD for the first viewing angle A1″. Figures 2 to 4 The method for explaining is to calculate the viewing angle characteristic VAD for the first viewing angle A1″.

[0107] The image analysis unit 300 compares the image characteristics of the first area AA of the first front viewpoint image FVI1 with the image characteristics of the second front viewpoint image FVI2, and based on the comparison result, calculates the image of the viewing angle for the first area AA. Thus, the viewing angle characteristic VAD from 0° to the second viewing angle A" can be calculated.

[0108] In one embodiment, the image analysis unit 300 may remove the perspective component from the first front viewpoint image FVI1 based on the result of comparing the image characteristics of the first area AA with the image characteristics of the second front viewpoint image FVI2 (and / or comparing the image characteristics of the second area BB with the image characteristics of the third front viewpoint image FVI3). For example, the image characteristics of the first area AA may be replaced with the image characteristics of the second front viewpoint image FVI2, or the image characteristics of the first area AA may be corrected based on the image characteristics of the second front viewpoint image FVI2.

[0109] In one embodiment, the image analysis unit 300 may compare the image characteristics of the first front viewpoint image FVI1 (i.e., the corrected first front viewpoint image) with the view component removed and the image characteristics of the side viewpoint image SVI to calculate the view characteristic VAD for the first view A1″.

[0110] Right now, Figure 5 The image measuring device can accurately measure and calculate the viewing angle characteristic VAD at a small viewing angle below the second viewing angle A". Figure 4 Compared with the image measurement device, the precision and accuracy of the viewing angle characteristic VAD calculated for all viewing angles are further improved.

[0111] As described above, the image measuring device 1000 according to the embodiment of the present invention includes a plurality of reflector components, so that not only the front viewpoint image but also the side viewpoint images corresponding to a plurality of viewpoints can be obtained by a single image capture, thereby significantly shortening the time for measuring and compensating the viewpoint characteristics of the viewpoint of the display panel 10 and shortening the process time.

[0112] In addition, by comparing and analyzing the obtained images, the image characteristics (viewing angle characteristics VAD) at different viewing angles can be calculated more accurately. Therefore, this viewing angle characteristics VAD is applied to the design and driving of display devices to improve image quality.

[0113] The present invention has been described above with reference to the embodiments. However, it should be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the scope of the concept and spirit of the present invention as described in the claims.

Claims

1. An image measuring device, characterized in that: include: A base, on which a display panel is mounted; An image acquisition unit, which captures the display surface of the display panel to acquire the image displayed by the display panel; an image reflecting unit, for reflecting the image of the display panel to the image acquiring unit; and an image analysis unit that analyzes at least one of the color and brightness of an image obtained according to the angle at which the image is reflected to determine the viewing angle characteristic of the display panel, The image acquisition unit simultaneously acquires images corresponding to multiple reflection angles by taking a single shot. The image acquisition unit includes a camera that acquires a first image using light emitted from a target portion of the display surface and directly incident vertically without being reflected by the image reflection unit, and acquires a second image using light reflected from the target portion to the image reflection unit.

2. The image measuring device according to claim 1, characterized in that: The image reflecting unit includes at least one reflecting mirror component arranged within the field of view of the camera.

3. The image measuring device according to claim 2, characterized in that: The at least one reflector member reflects light of the image of the target site toward the image acquisition unit.

4. The image measuring device according to claim 2, characterized in that: The image analysis unit determines the angle between a vertical axis and a light path incident from the target portion to the at least one reflector component as a viewing angle relative to the display panel, wherein the vertical axis is a vertical axis between the target portion and the camera.

5. The image measuring device according to claim 4, characterized in that: The above-mentioned image analysis department includes: a characteristic detection unit that analyzes the spectral tristimulus values ​​of the first image and the second image to detect image characteristics including information on brightness and color; and The viewing angle characteristic determination unit compares a first image characteristic of the first image with a second image characteristic of the second image, and determines the viewing angle characteristic of the second image with respect to the first image.

6. The image measuring device according to claim 5, characterized in that: The image analysis unit further includes an image correction unit that generates correction parameters reflecting the optical characteristics of the at least one reflector component and provides the correction parameters to the viewing angle characteristic determination unit.

7. The image measuring device according to claim 6, characterized in that: The viewing angle characteristic determination unit applies the correction parameter to the second image characteristic, and compares the second image characteristic to which the correction parameter is applied with the first image characteristic.

8. The image measuring device according to claim 5, characterized in that: The camera also obtains a third image, which is a 2D image including the entire display surface of the first image.

9. The image measuring device according to claim 8, characterized in that: The characteristic detection unit detects the image characteristic of the third image. The image analyzing unit further includes an offset determining unit for comparing the first image characteristic with the third image to calculate an image offset applied to a region other than the target portion of the display panel.

10. The image measuring device according to claim 1, characterized in that: The first image is an image of a front viewpoint of the target part, and the second image is an image of a side viewpoint corresponding to a preset viewing angle of the target part.

Images