WO2018161814A1

WO2018161814A1 - Testing backlight source and operation method thereof, and testing device for display panel

Info

Publication number: WO2018161814A1
Application number: PCT/CN2018/077258
Authority: WO
Inventors: 朱麾忠
Original assignee: 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
Priority date: 2017-03-09
Filing date: 2018-02-26
Publication date: 2018-09-13
Also published as: CN107068023A

Abstract

The present invention relates to the field of display technology. Provided are a testing backlight source and an operation method thereof, and a testing device for a display panel. The testing backlight source comprises: a plurality of light-emitting units (11) capable of emitting light beams of different colors, wherein respective monochromatic light beams emitted by the plurality of light-emitting units (11) can mixed into a white light beam; a driving circuit (12) for providing driving signals to the respective light-emitting units (11) to drive emission of light by the corresponding light-emitting units (11), wherein duty cycles of the driving signals are adjustable; and a controller (13) capable of adjusting the duty cycles of the driving signals corresponding to the respective light-emitting units (11) so as to move a color coordinate of the white light beam formed by mixing the monochromatic light beams emitted by the plurality of light-emitting units (11) to a preset color coordinate.

Description

Test backlight and its working method, test device for display panel

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 201710137330.9, filed on Jan. 9, 2017, the entire content of

Technical field

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.

Background technique

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.

Summary of the invention

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.

In one aspect, 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.

In some optional embodiments, 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.

In some optional embodiments, 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.

In some optional embodiments, 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.

In some optional embodiments, the first color is red, the second color is green, and the third color is blue.

In some optional embodiments, 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.

In some optional embodiments, 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.

In some optional embodiments, 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.

Embodiments of the present disclosure have the following advantageous effects: in the above solution, 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 Corresponding to the duty ratio of the driving signal, 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. In this way, it is not necessary to separately design a corresponding test backlight for each type of display panel, and the 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.

DRAWINGS

1 is a schematic structural view of a test backlight according to an embodiment of the present disclosure;

2 is a schematic structural diagram of testing a backlight according to an embodiment of the present disclosure;

3 is a schematic structural diagram of a controller according to an embodiment of the present disclosure;

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.

detailed description

The technical problems, the technical solutions, and the advantages of the embodiments of the present disclosure will become more apparent from the following detailed description.

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. In this way, it is not necessary to separately design a corresponding test backlight for each type of display panel, and the 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.

In a specific embodiment, as shown in FIG. 2, 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.

Specifically, the first color is red, the second color is green, and the third color is blue. Of course, 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.

By adjusting the duty ratio of the driving signal corresponding to each of the light-emitting devices, 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.

In a specific embodiment, the driving signal can be adjusted by comparing with the current color coordinates of the test backlight. As shown in FIG. 3, 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.

In another specific embodiment, the output driving signal can be controlled by comparing with the reference color coordinates. As shown in FIG. 3, 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.

Specifically, 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. In this way, it is not necessary to separately design a corresponding test backlight for each type of display panel, and the 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.

In this embodiment, 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. In this way, it is not necessary to separately design a corresponding test backlight for each type of display panel, and the 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.

In a specific embodiment, the driving signal can be adjusted by comparing with the current color coordinates of the test backlight. As shown in FIG. 5, 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. Driving signal duty adjustment amount of the driving sub circuit, the second driving sub circuit, and the third driving sub circuit;

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. .

In another embodiment, the output driving signal can be controlled by comparing with the reference color coordinates. As shown in FIG. 6, 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.

In a specific embodiment, the illuminating device comprises a red illuminating device, a green illuminating device and a blue illuminating device, and 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. Finally, 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.

The above is a preferred embodiment of the present disclosure, and it should be noted that those skilled in the art can also make several improvements and refinements without departing from the principles of the present disclosure. It should be considered as the scope of protection of this disclosure.

Claims

A test backlight that includes:

a plurality of light-emitting devices capable of emitting different colors, wherein the single-color light emitted by the plurality of light-emitting devices can be mixed into white light;

Providing a driving signal to each of the light emitting devices to drive a driving circuit corresponding to the light emitting device to emit light, wherein a duty ratio of the driving signal is adjustable;

The controller capable of adjusting the duty ratio of the driving signal corresponding to each of the light-emitting devices such that the color coordinates of the white light mixed by the plurality of light-emitting devices reaches the preset color coordinates.
The test backlight of claim 1 wherein said plurality of illumination devices comprises:

a first illuminating device capable of emitting monochromatic light of a first color;

a second illuminating device capable of emitting a second color of monochromatic light;

a third illuminating device capable of emitting a third color of monochromatic light;

The driving circuit includes:

a first driving sub-circuit that supplies a driving signal to the first lighting device;

a second driving sub-circuit that supplies a driving signal to the second lighting device;

a third driving sub-circuit that supplies a driving signal to the third lighting device;

The controller is specifically configured to separately adjust a duty ratio of a 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 test backlight of claim 2 wherein said controller comprises:

a comparing device, configured to 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;

a calculating device, configured to respectively calculate 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 respectively calculate the color coordinate adjustment amount according to the color coordinate adjustment amount a driving signal duty ratio adjustment amount of the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit;

And an adjusting device, configured to perform 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 according to the calculated driving signal duty ratio adjustment amount Make adjustments.
The test backlight of claim 2 wherein said controller comprises:

a comparing device, configured to compare the reference color coordinate with the preset color coordinate to obtain a difference between the reference color coordinate and the preset color coordinate;

a calculating device, configured to respectively 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 driver separately according to the color coordinates a duty cycle of a driving signal of the circuit, the second driving sub-circuit, and the third driving sub-circuit;

a control device, configured to control, 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 first driving sub-circuit, the first The two driver subcircuits and the third driver subcircuit output drive signals.
A test backlight according to any of claims 2-4, wherein the first color is red, the second color is green, and the third color is blue.
A test backlight according to any one of claims 1 to 4, wherein the illumination device is an LED.
A test device for a display panel, comprising the test backlight of any of claims 1-6.
A method of testing a backlight, wherein the method of applying the backlight of any of claims 1-6, the method comprising:

The duty ratio of the driving signal corresponding to each of the light-emitting devices is adjusted such that the color coordinates of the white light mixed by the plurality of light-emitting devices reach the preset color coordinates.
The method for testing a backlight according to claim 8 is applied to the test backlight of claim 2, wherein 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 coordinate to obtain a difference between the current color coordinate and the preset color coordinate;

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 calculating the first driving sub circuit according to the color coordinate adjusting amount And a driving signal duty ratio adjustment amount of the second driving sub-circuit and the third driving sub-circuit;

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 according to the calculated driving signal duty-adjusting amount.
The method for testing a backlight according to claim 8 is applied to the test backlight of claim 2, wherein adjusting the duty ratio of the driving signal corresponding to each of the illuminating devices comprises:

Comparing the reference color coordinate with the preset color coordinate to obtain a difference between the reference color coordinate and the preset color coordinate;

Calculating, according to the difference, color coordinates of the first illuminating device, the second illuminating device, and the third illuminating device, respectively, and calculating, according to the color coordinates, the first driving subcircuit, the first a driving signal duty ratio of the two driving sub-circuits and the third driving sub-circuit;

Controlling the first driving sub-circuit, the second driving sub-circuit, and the duty ratio of driving signals of the first driving sub-circuit, the second driving sub-circuit, and the third driving sub-circuit The third driver subcircuit outputs a drive signal.