WO2018161814A1 - Source de rétroéclairage de test, son procédé de fonctionnement et dispositif de test pour panneau d'affichage - Google Patents

Source de rétroéclairage de test, son procédé de fonctionnement et dispositif de test pour panneau d'affichage Download PDF

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Publication number
WO2018161814A1
WO2018161814A1 PCT/CN2018/077258 CN2018077258W WO2018161814A1 WO 2018161814 A1 WO2018161814 A1 WO 2018161814A1 CN 2018077258 W CN2018077258 W CN 2018077258W WO 2018161814 A1 WO2018161814 A1 WO 2018161814A1
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WIPO (PCT)
Prior art keywords
circuit
driving
light
color
driving sub
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PCT/CN2018/077258
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English (en)
Chinese (zh)
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朱麾忠
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京东方科技集团股份有限公司
北京京东方专用显示科技有限公司
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Publication of WO2018161814A1 publication Critical patent/WO2018161814A1/fr

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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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays

Definitions

  • the present disclosure relates to the field of display technology, and in particular to a test device for testing a backlight and its working method, and a display panel.
  • test backlight Before the display panel is shipped from the factory, it is necessary to test the colorimetric indicators of the display panel by using the test backlight. However, different customers and different fields have different control requirements for the color coordinates of the test backlight. In the related art, it is necessary to separately design a corresponding test backlight for each type of display panel to test the chromaticity-related index. The time and cost of testing are huge.
  • the present disclosure provides a test device for testing a backlight and a working method thereof, and a display panel, which can adjust the color coordinates of the test backlight in real time when testing the display panel.
  • an embodiment of the present disclosure provides a test backlight, including: a plurality of light emitting devices capable of emitting different colors, wherein monochromatic lights emitted by the plurality of light emitting devices can be mixed into white light; and driving signals are provided to each of the light emitting devices.
  • Driving a driving circuit corresponding to the illuminating device for illuminating, wherein the duty ratio of the driving signal is adjustable; the duty ratio of the driving signal corresponding to each illuminating device can be adjusted, so that the color coordinates of the white light mixed by the plurality of illuminating devices reach the pre-predetermined A controller that sets the color coordinates.
  • the plurality of light emitting devices comprise: a first light emitting device capable of emitting a first color of monochromatic light; a second light emitting device capable of emitting a second color of monochromatic light; capable of emitting a third color a third light-emitting device of monochromatic light;
  • the drive circuit comprising: a first drive sub-circuit providing a drive signal to the first light-emitting device; and a second drive sub-circuit providing a drive signal to the second light-emitting device;
  • the third illuminating device provides a third driving sub-circuit of the driving signal;
  • the controller is specifically configured to respectively adjust a duty ratio of the driving signal output by each driving sub-circuit according to the preset color coordinate; wherein The first color monochromatic light, the second color monochromatic light, and the third color monochromatic light can be mixed into white light.
  • the controller includes: a comparing device, configured to compare a current color coordinate of the test backlight with the preset color coordinate to obtain the current color coordinate and the pre- a difference between the color coordinates; calculating means for calculating color coordinate adjustment amounts of the first light emitting device, the second light emitting device, and the third light emitting device according to the difference, and according to the Calculating a duty ratio adjustment amount of the driving signal of the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit respectively; adjusting means for calculating the driving signal according to the calculation The duty ratio adjustment amount adjusts a duty ratio of a driving signal currently outputted by the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit, respectively.
  • the controller includes: a comparing device, configured to compare a reference color coordinate with the preset color coordinate to obtain a relationship between the reference color coordinate and the preset color coordinate a difference device; calculating means for respectively calculating color coordinates of the first illuminating device, the second illuminating device, and the third illuminating device according to the difference, and separately calculating the color coordinates according to the color coordinates a driving signal duty ratio of the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit; and control means for calculating the first driving sub-circuit and the second driving The driving signal duty ratios of the sub-circuit and the third driving sub-circuit control the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit to output driving signals.
  • a comparing device configured to compare a reference color coordinate with the preset color coordinate to obtain a relationship between the reference color coordinate and the preset color coordinate a difference device
  • calculating means for respectively calculating color coordinates of the first
  • the first color is red
  • the second color is green
  • the third color is blue
  • the illumination device is an LED.
  • Embodiments of the present disclosure also provide a test device for a display panel, including the test backlight as described above.
  • the embodiment of the present disclosure further provides a working method for testing a backlight, which is applied to the test backlight as described above, the method comprising: adjusting a duty ratio of a driving signal corresponding to each light emitting device, so that the plurality of light emitting devices The color coordinates of the mixed white light reach the preset color coordinates.
  • the adjusting the duty ratio of the driving signal corresponding to each of the illuminating devices comprises: comparing a current color coordinate of the test backlight with the preset color coordinates to obtain the current color a difference between the coordinates and the preset color coordinates; calculating color coordinate adjustment amounts of the first light emitting device, the second light emitting device, and the third light emitting device according to the difference, and according to the Calculating the duty ratio adjustment amount of the driving signal of the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit respectively; adjusting the duty ratio according to the calculated driving signal
  • the duty ratios of the driving signals currently output by the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit are respectively adjusted.
  • the adjusting the duty ratio of the driving signal corresponding to each of the illuminating devices comprises: comparing the reference color coordinates with the preset color coordinates to obtain the reference color coordinates and the pre- a difference between the color coordinates; calculating color coordinates of the first light emitting device, the second light emitting device, and the third light emitting device according to the difference, and respectively calculating the color coordinates according to the color coordinates a driving signal duty ratio of the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit; according to the calculated first driving sub-circuit, the second driving sub-circuit, and the The driving signal duty ratio of the third driving sub-circuit controls the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit to output a driving signal.
  • the test backlight includes a plurality of light emitting devices capable of emitting monochromatic light of different colors, and the monochromatic light emitted by the plurality of light emitting devices can be mixed into white light by adjusting each
  • the illuminating device can adjust the color coordinates of the monochromatic light emitted by each illuminating device, thereby adjusting the color coordinates of the white light mixed by the plurality of illuminating devices, and realizing the color coordinates of the white light emitted by the test backlight. Adjustable.
  • test backlight of the present disclosure can be used to test different types of display panels, and only need to adjust the test backlight when testing the display panel.
  • the color coordinates of the white light enable the color coordinates of the white light of the test backlight to meet the testing requirements of the display panel.
  • FIG. 1 is a schematic structural view of a test backlight according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of testing a backlight according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of a controller according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic flow chart of a method for testing a backlight according to an embodiment of the present disclosure
  • FIG. 5 and FIG. 6 are schematic diagrams of adjusting a duty ratio of a driving signal corresponding to each light emitting device according to an embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of color coordinates of different color lights according to an embodiment of the present disclosure.
  • Embodiments of the present disclosure provide a test device for testing a backlight and a working method thereof, and a display panel, which can adjust the color coordinates of the test backlight in real time when testing the display panel.
  • the existing test backlight generally includes only one color illuminating device, and the test backlight of the embodiment includes a plurality of illuminating devices 11 capable of emitting different colors as shown in FIG.
  • the color light can be mixed into white light;
  • the test backlight of the embodiment further includes: a driving circuit 12 for supplying a driving signal to each of the light emitting devices to drive the corresponding light emitting device to emit light, wherein the duty ratio of the driving signal is adjustable;
  • the duty ratio of the driving signal corresponding to each of the light-emitting devices is such that the color coordinates of the white light mixed by the plurality of light-emitting devices reach the controller 13 of the preset color coordinates.
  • the test backlight of the embodiment includes a plurality of light-emitting devices capable of emitting monochromatic light of different colors, and the monochromatic light emitted by the plurality of light-emitting devices can be mixed into white light, and by adjusting the duty ratio of the corresponding driving signal of each of the light-emitting devices, The color coordinates of the monochromatic light emitted by each of the light-emitting devices are adjusted, and the color coordinates of the white light mixed by the plurality of light-emitting devices are adjusted to adjust the color coordinates of the white light emitted by the test backlight.
  • test backlight of the present disclosure can be used to test different types of display panels, and only need to adjust the white light of the test backlight when testing the display panel.
  • the color coordinates of the white light of the test backlight can meet the test requirements of the display panel.
  • the plurality of light emitting devices 11 may include: a first light emitting device 111 capable of emitting a first color monochromatic light; and a second light emitting device 112 capable of emitting a second color monochromatic light a third light-emitting device 113 capable of emitting a third color monochromatic light;
  • the drive circuit 12 comprising: a first drive sub-circuit 121 that supplies a drive signal to the first light-emitting device; and a drive to the second light-emitting device a second driving sub-circuit 122 of the signal; a third driving sub-circuit 123 for providing a driving signal to the third lighting device;
  • the controller 13 is specifically configured to separately adjust each driving sub-circuit output according to the preset color coordinate The duty ratio of the driving signal; wherein the first color monochromatic light, the second color monochromatic light, and the third color monochromatic light can be mixed into white light.
  • the first color is red
  • the second color is green
  • the third color is blue
  • the first color, the second color, and the third color are not limited to using red, green, and blue, and may be other colors as long as the monochromatic light emitted by the first color, the second color, and the third color can be mixed. It can be white light, for example, the first color, the second color, and the third color can also be yellow, magenta, and cyan, respectively.
  • the color coordinates of the monochromatic light emitted by the light-emitting device can be adjusted, and the color coordinates of the white light mixed by the plurality of light-emitting devices can be adjusted.
  • the driving signal can be adjusted by comparing with the current color coordinates of the test backlight.
  • the controller includes: a comparing device 131 for testing the current backlight. The color coordinates are compared with the preset color coordinates to obtain a difference between the current color coordinates and the preset color coordinates; and the calculating means 132 is configured to separately calculate the first light according to the difference a color coordinate adjustment amount of the device, the second light emitting device, and the third light emitting device, and calculating the first driving sub circuit, the second driving sub circuit, and the first according to the color coordinate adjustment amount a driving signal duty ratio adjustment amount of the three driving sub-circuit; and adjusting means 133, configured to respectively perform the driving signal duty ratio adjustment amount on the first driving sub circuit, the second driving sub circuit, and the The duty ratio of the drive signal currently output by the third driving sub-circuit is adjusted.
  • the output driving signal can be controlled by comparing with the reference color coordinates.
  • the controller includes: a comparing device 131 for using the reference color coordinates and the preset color coordinates. Comparing, obtaining a difference between the reference color coordinate and the preset color coordinate; calculating means 132, configured to separately calculate the first light emitting device, the second light emitting device, and the a color coordinate of the third light emitting device, and calculating a duty ratio of a driving signal of the first driving sub circuit, the second driving sub circuit, and the third driving sub circuit according to the color coordinate; the control device 133 And controlling the first driving sub-circuit and the second driving according to the calculated driving signal duty ratios of the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit
  • the sub-circuit and the third driver sub-circuit output a drive signal.
  • the light emitting device may employ an LED.
  • the driving circuit 12 may include, for example, common electronic components such as transistors, capacitors, resistors, etc.; the controller 13 and the comparison device 131, the computing device 132, and the control device 133 included therein may pass common control circuits, chips, or processes. Electronic components such as devices are implemented in accordance with the specific features of the description of the present disclosure. I won't go into details here.
  • This embodiment provides a test device for a display panel, including the test backlight as described above.
  • the test backlight of the test device of the embodiment includes a plurality of light-emitting devices capable of emitting monochromatic light of different colors, and the monochromatic light emitted by the plurality of light-emitting devices can be mixed into white light by adjusting the duty ratio of the corresponding driving signal of each of the light-emitting devices.
  • the color coordinates of the monochromatic light emitted by each of the light-emitting devices can be adjusted, and the color coordinates of the white light mixed by the plurality of light-emitting devices can be adjusted to adjust the color coordinates of the white light emitted by the test backlight.
  • test backlight of the present disclosure can be used to test different types of display panels, and only need to adjust the white light of the test backlight when testing the display panel.
  • the color coordinates of the white light of the test backlight can meet the test requirements of the display panel.
  • This embodiment provides a method for testing a backlight, which is applied to the test backlight as described above. As shown in FIG. 4, the method includes the following steps.
  • Step 201 Adjust the duty ratio of the driving signal corresponding to each of the light emitting devices, so that the color coordinates of the white light mixed by the plurality of light emitting devices reach the preset color coordinates.
  • the test backlight includes a plurality of light-emitting devices capable of emitting monochromatic light of different colors, and the monochromatic light emitted by the plurality of light-emitting devices can be mixed into white light, and the duty ratio of the corresponding driving signal of each of the light-emitting devices is adjusted.
  • the color coordinates of the monochromatic light emitted by each of the light-emitting devices can be adjusted, and the color coordinates of the white light mixed by the plurality of light-emitting devices can be adjusted to adjust the color coordinates of the white light emitted by the test backlight.
  • test backlight of the present disclosure can be used to test different types of display panels, and only need to adjust the white light of the test backlight when testing the display panel.
  • the color coordinates of the white light of the test backlight can meet the test requirements of the display panel.
  • the driving signal can be adjusted by comparing with the current color coordinates of the test backlight.
  • the adjusting the duty ratio of the driving signal corresponding to each illuminating device includes:
  • Step 301 Compare a current color coordinate of the test backlight with the preset color coordinate to obtain a difference between the current color coordinate and the preset color coordinate.
  • Step 302 Calculate color coordinate adjustment amounts of the first illumination device, the second illumination device, and the third illumination device according to the difference, and calculate the first according to the color coordinate adjustment amount.
  • Step 303 Adjust a duty ratio of a driving signal currently outputted by the first driving sub circuit, the second driving sub circuit, and the third driving sub circuit according to the calculated driving signal duty adjustment amount.
  • the output driving signal can be controlled by comparing with the reference color coordinates.
  • the adjusting the duty ratio of the driving signal corresponding to each of the light emitting devices includes:
  • Step 401 Compare a reference color coordinate with the preset color coordinate to obtain a difference between the reference color coordinate and the preset color coordinate;
  • Step 402 Calculate color coordinates of the first lighting device, the second lighting device, and the third lighting device according to the difference, and calculate the first driving sub-circuit according to the color coordinates, a driving signal duty ratio of the second driving sub-circuit and the third driving sub-circuit;
  • Step 403 Control the first driving sub-circuit and the second driving according to the calculated driving signal duty ratios of the first driving sub-circuit, the second driving sub-circuit and the third driving sub-circuit
  • the sub-circuit and the third driver sub-circuit output a drive signal.
  • the illuminating device comprises a red illuminating device, a green illuminating device and a blue illuminating device
  • the driving circuit is capable of providing driving signals to the illuminating devices of each color, by adjusting the duty of the driving signals corresponding to each illuminating device For example, the color coordinates of the monochromatic light emitted by the light-emitting device can be adjusted, and the color coordinates of the white light mixed by the plurality of light-emitting devices can be adjusted.
  • Figure 7 shows the gamut of different colors of a test backlight.
  • the four coordinates in the figure are: R(x 1 , y 1 ), G(x 2 , y 2 ), B(x 3 , y 3 ) does not represent the color coordinates of red, green, and blue light, W(x 0 , y 0 ) represents the reference color coordinate of white light, and adjusts the color coordinate of the white light of the test backlight to W(x n , y n ), first determine the difference from W(x 0 , y 0 ), and then decompose into RGB three primary colors, and determine the adjustment amount of the color coordinates of red light, green light, and blue light by mathematical modeling.
  • the specific calculation method can be obtained based on basic optical knowledge, so it will not be discussed here.
  • the purpose of accurately adjusting the color coordinates is achieved by adjusting the duty ratio of the driving signal corresponding to the light-emitting device.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

La présente invention, qui appartient au domaine des techniques d'affichage, concerne une source de rétroéclairage de test, son procédé de fonctionnement et un dispositif de test pour un panneau d'affichage. La source de rétroéclairage de test comprend : une pluralité d'unités électroluminescentes (11) capables d'émettre des faisceaux de lumière de différentes couleurs, des faisceaux de lumière monochromatique respectifs émis par la pluralité des unités électroluminescentes (11) pouvant être mélangés pour obtenir un faisceau de lumière blanche ; un circuit de commande (12) pour fournir des signaux de commande aux unités électroluminescentes respectives (11) pour commander une émission de lumière par les unités électroluminescentes correspondantes (11), des facteurs d'utilisation des signaux de commande étant ajustables ; et un contrôleur (13) capable d'ajuster les facteurs d'utilisation des signaux de commande correspondants aux unités électroluminescentes respectives (11) de sorte à déplacer une coordonnée de couleur du faisceau de lumière blanche formée par mélange des faisceaux de lumière monochromatique émis par la pluralité d'unités électroluminescentes (11) vers une coordonnée de couleur prédéfinie.
PCT/CN2018/077258 2017-03-09 2018-02-26 Source de rétroéclairage de test, son procédé de fonctionnement et dispositif de test pour panneau d'affichage WO2018161814A1 (fr)

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CN201710137330.9 2017-03-09
CN201710137330.9A CN107068023A (zh) 2017-03-09 2017-03-09 测试背光源及其工作方法、显示面板的测试设备

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CN107068023A (zh) * 2017-03-09 2017-08-18 北京京东方专用显示科技有限公司 测试背光源及其工作方法、显示面板的测试设备
CN111899310A (zh) * 2020-09-30 2020-11-06 歌尔光学科技有限公司 投影镜头占空比调整方法、装置、设备和计算机存储介质

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