WO2013076781A1 - 表示素子の輝度計測方法および輝度調整装置 - Google Patents
表示素子の輝度計測方法および輝度調整装置 Download PDFInfo
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- WO2013076781A1 WO2013076781A1 PCT/JP2011/006574 JP2011006574W WO2013076781A1 WO 2013076781 A1 WO2013076781 A1 WO 2013076781A1 JP 2011006574 W JP2011006574 W JP 2011006574W WO 2013076781 A1 WO2013076781 A1 WO 2013076781A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
Definitions
- the present invention relates to a luminance measuring method and a luminance adjusting apparatus for measuring the luminance of a display element constituting a screen of a display device.
- the luminance of each display element needs to be uniform.
- the brightness of each display element varies due to the difference in the characteristics of the display elements. Therefore, the luminance of the display element is made uniform by adjusting the drive signal of the display element.
- a measurement technique for detecting the luminance for each display element is required.
- a method for measuring the luminance of a display device there is a technique for imaging a display screen and measuring the luminance of each pixel on the captured image (see, for example, Patent Document 1).
- Patent Document 1 in order to eliminate the influence of luminance of adjacent pixels and perform accurate measurement, the pixels of each color are temporally divided for each color so that pixels that are not adjacent to each other can be selectively imaged. It was turned on and the brightness was measured by imaging for each color.
- the luminance measurement method of Patent Document 1 is applied to a large screen display device, it is difficult to measure in a short time because of the large screen, and changes in the external environment such as external light occur over time. There is a problem that the measurement result varies depending on the timing of acquiring the luminance value.
- the present invention has been made to solve the above-described problems, and an object thereof is to improve the accuracy by suppressing variations in luminance measurement values between captured images.
- the adjacent display elements do not emit light at the same time. From the pixel value of the position on the captured image specified in the display element position calculating step and the display element position calculating step for specifying the position of the display element and the reference light source on each captured image.
- a display element luminance calculating step for calculating the luminance of the display element and the reference light source; and a relative luminance calculating step for calculating a relative luminance of the display element with respect to the luminance of the reference light source calculated in the display element luminance calculating step for each captured image.
- the brightness adjusting device for a display element is the same as the number of lighting patterns captured by lighting with a lighting pattern divided in time so that adjacent display elements do not emit light at the same time while a predetermined reference light source emits light. From the pixel value of the position on the captured image specified by the display element position calculation unit and the display element position calculation unit that specifies the position of the display element and the reference light source on each captured image.
- a display element luminance calculation unit that calculates the luminance of the display element and the reference light source; a relative luminance calculation unit that calculates a relative luminance of the display element with respect to the luminance of the reference light source calculated by the display element luminance calculation unit for each captured image; And an output coefficient calculation unit that obtains a coefficient for adjusting the light emission amount of the display element based on the relative luminance calculated by the luminance calculation unit.
- the luminance measurement value variation between the captured images is calculated. Measurement accuracy can be improved. In addition, the adjustment accuracy can be improved by adjusting the light emission amount of the display element based on the calculation result of the relative luminance.
- FIG. 1 is an overall configuration diagram of a brightness adjustment system to which a brightness adjustment apparatus according to Embodiment 1 of the present invention is applied.
- 2 is a block diagram showing an internal configuration of a brightness adjusting apparatus according to Embodiment 1.
- FIG. 3 is a flowchart showing an operation of the brightness adjustment apparatus according to the first embodiment.
- 3 is a diagram illustrating a lighting pattern of the display device of Embodiment 1.
- FIG. It is a block diagram which shows the internal structure of the brightness adjusting apparatus which concerns on Embodiment 2 of this invention.
- 10 is a diagram illustrating a lighting pattern of the display device of Embodiment 2.
- FIG. 10 is a flowchart illustrating an operation of the brightness adjustment apparatus according to the second embodiment.
- FIG. 10 is a flowchart illustrating the operation of the brightness adjustment apparatus according to the third embodiment.
- FIG. 1 is an overall configuration diagram of a brightness adjustment system to which the brightness adjustment apparatus 5 according to Embodiment 1 is applied.
- the display device 1 is a large screen display device having a display screen 2 in which a plurality of display elements are arranged side by side.
- the display device 1 has a reference light source 3 separately from the display elements constituting the display screen 2. Note that LEDs or the like are used as the display elements and the reference light source 3 that constitute the display screen 2.
- the imaging device 4 is installed at an arbitrary angle with respect to the display screen 2 of the display device 1 and the reference light source 3. Image data captured by the imaging device 4 is input to the brightness adjusting device 5.
- the brightness adjusting device 5 is configured by a computer, for example, and measures the brightness of the display element of the display device 1 using a captured image input from the image capturing device 4.
- FIG. 2 is a block diagram showing an internal configuration of the brightness adjusting device 5.
- the brightness adjustment device 5 includes a captured image acquisition unit 101 that acquires image data captured by the imaging device 4, a display element position calculation unit 102 that specifies the position of each display element 6 of the display device 1 from the captured image, and an imaging A display element luminance calculation unit 103 that calculates the luminance of the display element 6 and the luminance of the reference light source 3 based on the position specified on the image, and calculates a relative luminance value of the display element 6 with respect to the luminance value of the reference light source 3 And a display element output coefficient calculation unit 105 that calculates a coefficient for adjusting the output of the display element 6 based on the relative luminance.
- the coefficient calculated by the display element output coefficient calculation unit 105 is input to the display device 1.
- the output control unit 7 corrects the value of the output signal based on the coefficient, inputs the corrected output signal to each display element 6 constituting the display screen 2, and the light emission amount of each display element 6. To reduce luminance variation.
- FIG. 3 is a flowchart showing the operation of the brightness adjusting device 5.
- the image pickup device 4 is set in advance at an arbitrary angle with respect to the display device 1 and the reference light source 3, and each display element 6 of the display device 1 is thinned and turned on (step ST1), and the image pickup device 4 picks up an image (step ST1). ST2).
- the reference light source 3 is always turned on while the display element 6 is thinned.
- the operation control of the display device 1, the reference light source 3, and the imaging device 4 may be performed in any way.
- FIG. 4 is a diagram for explaining a lighting pattern of the display device 1.
- a total of nine display elements 6 arranged in 3 ⁇ 3 form one set, and each set of display elements 6 has the first to ninth lighting patterns. Lights up and images every lighting pattern. Therefore, in order to image all the display elements 6 in each group, the imaging is repeated nine times.
- the lighting pattern is not limited to the example of FIG. 4, and may be a temporally divided pattern in which the adjacent display elements 6 are not simultaneously lit so as to eliminate the influence of the luminance of the adjacent display elements 6. That's fine.
- the captured image acquisition unit 101 of the brightness adjusting device 5 acquires captured image data of each lighting pattern from the imaging device 4.
- captured image data may be acquired every time the lighting pattern is captured.
- the display element position calculation unit 102 detects the light source position on the captured image of each lighting pattern (step ST4).
- the position of the pixel at which the luminance is peaked is detected based on the pixel value of the captured image, or the pixel value of the captured image is binarized using a threshold value and exceeds the threshold value The pixel position is detected.
- the light source position between the reference light source 3 and each display element 6 on the captured image is determined by the user in advance with respect to the display element position calculation unit 102 by determining the existing region of the light source position of the reference light source 3 and the display element 6. You can specify it.
- the display element position calculation unit 102 may recognize the light source position detected in all captured images as the light source position of the reference light source 3.
- the display element luminance calculation unit 103 obtains a correspondence relationship between the light source position on the captured image detected by the display element position calculation unit 102 and the coordinates on the display screen 2 (step ST5). Based on the correspondence between the obtained light source position on the captured image and the coordinates on the display screen 2, the pixel position on the captured image for each display element 6 is estimated, and the luminance value of the pixel is calculated (step). ST6). Similarly, the pixel position on the captured image of the reference light source 3 is estimated, and the luminance value of the pixel is calculated.
- the relative luminance calculation unit 104 uses the luminance value of the display element 6 on the captured image calculated by the display element luminance calculation unit 103 as the luminance value of the reference light source 3 on the captured image calculated by the display element luminance calculation unit 103. Is converted into a relative value (step ST7).
- the relative luminance calculation unit 104 obtains the relative luminance value relative_x_y using the following equation (1).
- relative_x_y Brightness_x_y / brightness_base (1)
- brightness_x_y is the luminance value of the display element 6 calculated from the pixel of the coordinate (x, y) on the captured image
- brightness_base is the luminance value of the reference light source 3 calculated from the pixel on the captured image.
- the luminance value of the reference light source 3 calculated from the captured image of the lighting pattern captured by lighting the display element 6 at the coordinates (x, y) is used. Specifically, when nine captured images are used as illustrated in FIG. 4, in order to obtain the relative luminance value of the display element 6 that is lit with the first lighting pattern, the captured image of the first lighting pattern is used. The calculated luminance value of the display element 6 and the luminance value of the reference light source 3 are used. This is to remove the difference in external environment (external light, etc.) caused by the difference in imaging time for each captured image.
- the display element output coefficient calculation unit 105 emits light at a target luminance or displays A coefficient for adjusting an output signal for driving the display elements 6 is calculated so that light is emitted with an average value of the relative luminance of all the display elements 6 constituting the screen 2 (step ST8).
- the standard characteristics of the display element 6 used in the display device 1 are investigated in advance, a correspondence table of coefficients and luminance (for example, FIG. 3 and FIG. 6 of Patent Document 1) is prepared, and the display element output The coefficient calculation unit 105 may calculate the coefficient using this correspondence table.
- the display element output coefficient calculation unit 105 transfers the coefficient data of each display element 6 obtained in step ST8 to the output control unit 7 of the display device 1 (step ST9).
- the output control unit 7 corrects the output signal value of each display element 6 based on the coefficient data, and drives the display element 6 with the corrected output signal.
- the brightness adjusting device 5 is divided in time so that the adjacent display elements 6 do not emit light at the same time while the reference light source 3 provided separately from the display device 1 emits light.
- a captured image acquisition unit 101 that acquires captured image data corresponding to the number of lighting patterns that are lit with the lighting pattern, and a display element position calculation that specifies the positions of the display element 6 and the reference light source 3 on each captured image.
- Display element luminance calculation unit 103 that calculates the luminance of display element 6 and reference light source 3 from pixel values at positions on the captured image characterized by display element position calculation unit 102, and display element luminance for each captured image
- the relative luminance calculation unit 104 that calculates the relative luminance value of the display element 6 with respect to the luminance of the reference light source 3 calculated by the calculation unit 103, and the relative luminance value calculated by the relative luminance calculation unit 104.
- Embodiment 2 In the first embodiment, it is necessary to calculate the relative luminance of the display element with respect to the luminance of the reference light source 3 in order to eliminate variations between captured images, and therefore the reference light source 3 is separately required. On the other hand, in the second embodiment, the relative luminance of the display element 6 is calculated without using the reference light source 3.
- FIG. 5 is a block diagram showing an internal configuration of the brightness adjusting apparatus 5a according to the second embodiment. 5 that are the same as or equivalent to those in FIG. 2 are assigned the same reference numerals, and descriptions thereof are omitted.
- the brightness adjusting device 5a newly includes a relative brightness combining unit 106.
- luminance adjustment system of this Embodiment 2 is the structure which abbreviate
- FIG. 6 is a diagram for explaining a lighting pattern of the display device 1.
- an arbitrary area is set as the first reference light source area 11 among all the display elements 6 constituting the display screen 2, and is arranged in the first reference light source area 11.
- the display element 6 is handled as a reference light source.
- the first reference light source region 11 may be a region including a single display element 6 or a region including a plurality of display elements 6.
- region 12 is set from areas other than the 1st reference
- Adjacent display elements in such a lighting pattern (for example, a pattern in which a total of nine display elements 6 arranged in 3 ⁇ 3 are set as one set, and each set of display elements 6 is turned on in an arbitrary order) 6 is turned on at a time interval so as not to be turned on at the same time, and imaging is performed. Thereby, a set of nine captured images is obtained.
- FIG. 6A is a first measurement pattern.
- FIG. 6B is a second measurement pattern.
- the brightness adjusting device 5a performs the first and second measurement patterns, and finally prepares two sets of captured image groups.
- FIG. 7 is a flowchart showing the operation of the brightness adjusting device 5a.
- each display element 6 in the first thinned-out lighting region 12 of the display device 1 is thinned and turned on (step ST1).
- An image is taken (step ST2). While the display elements 6 in the first thinned-out lighting area 12 are thinned out, the display elements 6 in the first reference light source area 11 are always turned on.
- each display element 6 in the second thinning lighting area 14 is thinned and lit (step ST1), and the imaging device 4 is caused to pick up an image (step ST2). While the display element 6 in the second thinned-out lighting area 14 is thinned-out, the display element 6 in the second reference light source area 13 is always turned on.
- the captured image acquisition unit 101 of the brightness adjustment device 5a receives two sets from the imaging device 4. A captured image group is acquired.
- the brightness adjusting device 5a performs the same operation as that of steps ST4 to ST7 in FIG. 3 for each captured image group, and sets the first thinned lighting area 12 to the brightness value of the first reference light source area 11.
- the relative luminance value of each display element 6 and the relative luminance value of each display element 6 in the second thinned-out lighting region 14 with respect to the luminance value of the second reference light source region 13 are calculated.
- the relative luminance combining unit 106 combines the two sets of relative luminance value data to calculate the relative luminance values of all the display elements 6 on the display screen 2 (step ST11).
- a method of synthesizing the relative luminance value will be described with reference to FIG.
- FIG. 8A shows the display screen 2 in which the first thinned lighting region 12 is set with the first measurement pattern
- FIG. 8B shows the second thinned lighting region 14 with the second measurement pattern.
- the set display screen 2 is shown.
- the overlapping areas of the first thinned lighting area 12 and the second thinned lighting area 14 are defined as composite reference areas b1 and b2, respectively. Areas a1 and c2 are areas where only one set of relative luminance value data exists.
- FIG. 8C shows the display screen 2 in which the first measurement pattern and the second measurement pattern are synthesized.
- the luminance adjusting device 5a performs the same operation as that of steps ST8 and ST9 in FIG. 3 using the synthesized relative luminance value data, calculates a coefficient for adjusting the output signal, and outputs an output control unit. Forward to 7.
- the brightness adjusting device 5a uses the display elements 6 in the first reference light source region 11 and the second reference light source region 13 in the display screen 2 as the reference light source.
- the display elements 6 in the first thinned-out lighting area 12 and the second thinned-out lighting area 14 are lit in a lighting pattern divided in time so that adjacent display elements do not emit light at the same time, and the first measurement is performed.
- the relative luminance of the display element 6 calculated from the captured image data of the first measurement pattern and the second measurement pattern by the relative luminance calculation unit 104 is obtained.
- the display device output coefficient calculation unit 105 includes a relative luminance combining unit 106 that combines and interpolates the relative luminance of the display element 6 in the first reference light source region 11. 06 based on the two sets content in synthesized relative brightness in one set, and configured to determine a coefficient for adjusting the light emission amount so that the brightness of the display device 6 becomes uniform. For this reason, the luminance measurement and the luminance adjustment can be accurately performed without using the reference light source 3 different from the display device 1.
- Embodiment 3 the correspondence table between the coefficient for adjusting the output signal of the display element 6 and the luminance is created based on the standard characteristics of the display element 6 to be adjusted.
- the characteristics of the display element 6 of the device 1 are different from the standard characteristics, the intended luminance is not obtained even if the coefficient obtained from the measurement result is used. Therefore, in the third embodiment, after adjusting the luminance of the display device 1 in the first embodiment or the second embodiment, the captured image is acquired again, the adjustment result is analyzed, and the coefficient of the output signal is calculated. Make fine adjustments. When calculating this coefficient, a coefficient for further fine adjustment after this adjustment is determined using the coefficient before adjustment and the relative luminance value, and the coefficient after adjustment and the relative luminance value.
- FIG. 9 is a block diagram showing an internal configuration of the brightness adjusting apparatus 5b according to the third embodiment.
- the brightness adjusting device 5b newly includes a brightness uniformity evaluating unit 107.
- luminance adjustment system of this Embodiment 3 is the structure similar to the brightness
- FIG. 10 is a flowchart showing the operation of the brightness adjusting device 5b.
- the brightness adjusting device 5b performs the same operation as steps ST4 to ST7 in FIG. 3 to calculate the relative brightness value of each display element 6 on the display screen 2.
- the luminance uniformity evaluation unit 107 checks whether or not the relative luminance value of each display element 6 is uniform (step ST21). If the relative luminance value is uniform (step ST21 “YES”), the luminance of the display device 1 is determined. The process is terminated without adjustment.
- any method may be used, such as determining whether or not the relative luminance values (or standard deviations thereof) of all the display elements 6 are within an allowable range.
- the display element output coefficient calculation unit 105 calculates a coefficient for adjusting the output signal for driving the display element 6 (step ST8). .
- a new coefficient co_new for fine adjustment is calculated from the following equation (3) using the obtained coefficient.
- co_new (Co_now-co_pre) / (br_now-br_pre) ⁇ (br_target-br_pre) + co_pre (3)
- br_pre is the relative luminance value at the previous measurement
- co_pre is the coefficient at the previous measurement
- br_now is the relative luminance value at the current measurement
- co_now is the coefficient at the current measurement
- br_target is the relative luminance value of each display element 6. Average value.
- a coefficient co_new is determined so that the relative luminance value of the display element 6 deviating from the average value br_target of the relative luminance value becomes the average value br_target.
- the display element output coefficient calculation unit 105 transfers the coefficient co_new (the coefficient co_now for the first luminance measurement) of each display element 6 calculated by the luminance uniformity evaluation unit 107 to the output control unit 7 (step ST9).
- the brightness adjusting device 5b returns to step ST1 and performs brightness measurement again.
- the fine adjustment method of the third embodiment is applied to the first embodiment, but may be applied to the second embodiment.
- the luminance adjusting device 5b evaluates whether or not the luminance of each display element 6 constituting the display screen 2 is uniform based on the relative luminance calculated by the relative luminance calculating unit 104.
- the display element output coefficient calculation unit 105 includes a uniform luminance evaluation unit 107. If the luminance uniformity evaluation unit 107 evaluates that the luminance of each display element 6 is not uniform, the luminance of each display element 6 is uniform. The coefficient for adjusting the light emission amount is determined so as to be. For this reason, by repeating the measurement and adjustment of the brightness and performing the fine adjustment, the brightness of the display element 6 finally becomes more uniform, and the display screen 2 can display a high-quality image.
- the luminance measuring method and the luminance adjusting apparatus calculate the relative luminance of the display element of the display device with respect to the luminance of the reference light source, a wide range of luminance as in the LED large screen display device is obtained. Suitable for measurement and adjustment.
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Abstract
Description
実施の形態1.
図1は、実施の形態1に係る輝度調整装置5を適用した輝度調整システムの全体構成図である。表示装置1は、複数の表示素子を並べて配置した表示画面2を有する大画面表示装置であり、この表示画面2を構成する表示素子とは別に基準光源3を有する。なお、表示画面2を構成する表示素子および基準光源3としてはLED等を用いる。
撮像装置4は、表示装置1の表示画面2と基準光源3とに対して任意の角度で設置される。撮像装置4の撮像した画像データは輝度調整装置5へ入力する。
輝度調整装置5は、例えばコンピュータで構成され、撮像装置4から入力される撮像画像を用いて、表示装置1の表示素子の輝度を計測する。
表示素子出力係数算出部105で算出した係数は表示装置1に入力される。表示装置1では、出力制御部7がその係数に基づいて出力信号の値を補正し、表示画面2を構成する各表示素子6へ補正した出力信号を入力して、各表示素子6の発光量を均一化して輝度のばらつきを抑える。
図3は、輝度調整装置5の動作を示すフローチャートである。予め撮像装置4を表示装置1および基準光源3に対して任意の角度に設置した上で、表示装置1の各表示素子6を間引いて点灯させ(ステップST1)、撮像装置4に撮像させる(ステップST2)。表示素子6の間引き点灯中、基準光源3は常に点灯しておく。
なお、表示装置1、基準光源3および撮像装置4の動作制御はどのように行ってもよい。
なお、点灯パターンは図4の例に限定されるものではなく、隣り合った表示素子6の輝度の影響を排除できるよう、隣り合った表示素子6が同時に点灯しない時間的に分割したパターンであればよい。
relative_x_y
=brightness_x_y/brightness_base (1)
ここで、brightness_x_yは撮像画像上座標(x,y)の画素から算出した表示素子6の輝度値、brightness_baseは撮像画像上の画素から算出した基準光源3の輝度値である。なお、brightness_baseとしては、座標(x,y)の表示素子6を点灯させて撮像した点灯パターンの撮像画像から算出した基準光源3の輝度値を使用する。具体的には、図4のように9枚の撮像画像を使用する場合、第1の点灯パターンで点灯した表示素子6の相対輝度値を求めるためには、第1の点灯パターンの撮像画像から算出した表示素子6の輝度値と基準光源3の輝度値を使用する。これは、撮像画像毎に撮像時間が異なることに起因した外部環境(外光等)の差を取り除くためである。
出力制御部7は、係数データに基づいて各表示素子6の出力信号値を補正し、補正した出力信号で表示素子6を駆動する。
上記実施の形態1では、撮像画像間のばらつきを排除するために基準光源3の輝度に対する表示素子の相対輝度を算出する必要があり、そのために基準光源3が別途必要であった。これに対し、本実施の形態2では、基準光源3を用いることなく表示素子6の相対輝度を算出する。
また、本実施の形態2の輝度調整システムは、図1に示す輝度調整システムのうちの基準光源3を省略した構成であるため、以下では図1を援用する。
輝度調整装置5aは、第1と第2の計測パターンを実施して、最終的に2組の撮像画像群を用意する。
図7は、輝度調整装置5aの動作を示すフローチャートである。予め撮像装置4を表示装置1に対して任意の角度に設置した上で、表示装置1の第1の間引き点灯領域12の各表示素子6を間引いて点灯させ(ステップST1)、撮像装置4に撮像させる(ステップST2)。第1の間引き点灯領域12の表示素子6を間引き点灯中、第1の基準光源領域11の表示素子6は常に点灯しておく。同様にして、第2の間引き点灯領域14の各表示素子6を間引いて点灯させ(ステップST1)、撮像装置4に撮像させる(ステップST2)。第2の間引き点灯領域14の表示素子6を間引き点灯中、第2の基準光源領域13の表示素子6は常に点灯しておく。
図8(a)は、第1の計測パターンで第1の間引き点灯領域12を設定した表示画面2を示し、図8(b)は、第2の計測パターンで第2の間引き点灯領域14を設定した表示画面2を示す。そして、第1の間引き点灯領域12と第2の間引き点灯領域14とで重複する領域をそれぞれ合成基準領域b1,b2として定義する。領域a1,c2は相対輝度値データが1組分しか無い領域である。図8(c)は、第1の計測パターンと第2の計測パターンを合成した表示画面2を示す。
A=a1
B=b1 (2)
C=c2×avg(b1)/avg(b2)
上記実施の形態1,2において、表示素子6の出力信号を調節する係数と輝度の対応表が、調整対象の表示素子6の標準的な特性をもとに作成されたものであるため、表示装置1の表示素子6の特性が標準的なものと異なる場合は、計測結果から求めた係数を使用しても意図した輝度にならない。そこで、本実施の形態3では、上記実施の形態1または実施の形態2において表示装置1の輝度の調整を行った後、再度撮像画像を取得して調整結果を解析し、出力信号の係数の微調整を行う。この係数を計算する際に、調整前の係数と相対輝度値、および調整後の係数と相対輝度値を用いて、この調整後に更なる微調整を行うための係数を決定する。
また、本実施の形態3の輝度調整システムは、図1に示す輝度調整システムと同様の構成であるため、以下では図1を援用する。
co_new
=(co_now-co_pre)/(br_now-br_pre)
×(br_target-br_pre)+co_pre (3)
ここで、br_preは前回計測時の相対輝度値、co_preは前回計測時の係数、br_nowは今回計測時の相対輝度値、co_nowは今回計測時の係数、br_targetは各表示素子6の相対輝度値の平均値である。
次に表示素子出力係数算出部105が、輝度均一性評価部107で算出した各表示素子6の係数co_new(輝度計測1回目は係数co_now)を、出力制御部7へ転送する(ステップST9)。
そして、輝度調整装置5bは、ステップST1に戻り、再度輝度計測を実施する。
Claims (5)
- 表示装置の画面を構成する表示素子の輝度を計測する表示素子の輝度計測方法であって、
所定の基準光源が発光した状態で、隣接する前記表示素子同士が同時に発光しないよう時間的に分割した点灯パターンで点灯させて撮像された当該点灯パターン数分の撮像画像データを入力に用いて、当該各撮像画像上の前記表示素子および前記基準光源の位置を特定する表示素子位置算出ステップと、
前記表示素子位置算出ステップで特定した前記撮像画像上の位置の画素値から前記表示素子および前記基準光源の輝度を算出する表示素子輝度算出ステップと、
前記撮像画像毎に、前記表示素子輝度算出ステップで算出した前記基準光源の輝度に対する前記表示素子の相対輝度を算出する相対輝度算出ステップとを備えることを特徴とする表示素子の輝度計測方法。 - 入力に用いる撮像画像データは、表示装置の画面の任意領域の表示素子を基準光源として、当該基準光源が発光した状態で前記任意領域以外の表示素子を隣接する表示素子同士が同時に発光しないよう時間的に分割した点灯パターンで点灯させ、前記基準光源とする領域を変更して撮像された複数組の当該点灯パターン数分の撮像画像データであって、
相対輝度算出ステップで前記複数組の撮像画像データそれぞれから算出された前記表示素子の相対輝度を合成して、前記基準光源とする領域の表示素子の相対輝度を補間する相対輝度合成ステップを備えることを特徴とする請求項1記載の表示素子の輝度計測方法。 - 表示装置の画面を構成する表示素子の輝度を計測する表示素子の輝度調整装置であって、
所定の基準光源が発光した状態で、隣接する前記表示素子同士が同時に発光しないよう時間的に分割した点灯パターンで点灯させて撮像された当該点灯パターン数分の撮像画像データを入力に用いて、当該各撮像画像上の前記表示素子および前記基準光源の位置を特定する表示素子位置算出部と、
前記表示素子位置算出部で特定した前記撮像画像上の位置の画素値から前記表示素子および前記基準光源の輝度を算出する表示素子輝度算出部と、
前記撮像画像毎に、前記表示素子輝度算出部で算出した前記基準光源の輝度に対する前記表示素子の相対輝度を算出する相対輝度算出部と、
前記相対輝度算出部で算出した前記相対輝度に基づいて、前記各表示素子の輝度が均一になるように発光量を調節する係数を求める出力係数算出部とを備えることを特徴とする表示素子の輝度調整装置。 - 入力に用いる撮像画像データは、表示装置の画面の任意領域の表示素子を基準光源として、当該基準光源が発光した状態で前記任意領域以外の表示素子を隣接する表示素子同士が同時に発光しないよう時間的に分割した点灯パターンで点灯させ、前記基準光源とする領域を変更して撮像された複数組の当該点灯パターン数分の撮像画像データであって、
相対輝度算出部で前記複数組の撮像画像データそれぞれから算出された前記表示素子の相対輝度を合成して、前記基準光源とする領域の表示素子の相対輝度を補間する相対輝度合成部を備え、
出力係数算出部は、前記相対輝度合成部で複数組分を1組分に合成した相対輝度に基づいて、表示素子の発光量を調節する係数を求めることを特徴とする請求項3記載の輝度調整装置。 - 相対輝度算出部で算出した相対輝度に基づいて、画面を構成する各表示素子の輝度が均一か否かを評価する輝度均一評価部を備え、
出力係数算出部は、前記輝度均一評価部で前記各表示素子の輝度が均一でないと評価された場合に前記表示素子の発光量を調節する係数を求めることを特徴とする請求項3記載の輝度調整装置。
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