CN114859581B - Backlight testing device and backlight testing method - Google Patents

Backlight testing device and backlight testing method Download PDF

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Publication number
CN114859581B
CN114859581B CN202210303474.8A CN202210303474A CN114859581B CN 114859581 B CN114859581 B CN 114859581B CN 202210303474 A CN202210303474 A CN 202210303474A CN 114859581 B CN114859581 B CN 114859581B
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image
light
light source
distance
optical film
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CN114859581A (en
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张晓�
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices

Abstract

The application provides a backlight testing device and a backlight testing method, wherein the backlight testing device comprises a backlight system, an image acquisition system and a control system; the backlight system comprises an optical film material, a light source plate and a light emitting surface, wherein the optical film material is used for storing the light source plate to be verified; the image acquisition system is arranged opposite to the backlight system and is used for acquiring the image of the light emitting surface, the control system is respectively and electrically connected with the backlight system and the image acquisition system and is configured to receive the image acquired by the image acquisition system and determine whether the distance between the light source plate to be verified and the optical film material needs to be adjusted according to the image acquired by the image acquisition system. By using the backlight testing device provided by the embodiment of the application, the optimal light mixing distance of the backlight module can be rapidly determined by moving the light source plate and then carrying out image acquisition in the backlight testing process, thereby being beneficial to shortening the development period of the backlight module and reducing the development cost.

Description

Backlight testing device and backlight testing method
Technical Field
The application relates to the technical field of display, in particular to a backlight testing device and a backlight testing method.
Background
The optical effect of the direct type backlight module is closely related to the light mixing distance, and if the light mixing distance is not proper, the backlight is not uniform. The light source and the optical film material in different backlight modules are different, so that the required optimal light mixing distance is different for different backlight modules.
However, in the development process of the existing product, testing and verification are required to be performed on different backlight modules so as to determine the optimal light mixing distance for the different backlight modules, the process is complicated, the testing efficiency is low, the product development period is long, and the cost is high.
Disclosure of Invention
The application provides a backlight testing device and a backlight testing method aiming at the defects of the prior art, which are used for solving the problems of longer development period and higher cost caused by lower testing efficiency of a backlight module in the related art.
In a first aspect, an embodiment of the present application provides a backlight testing apparatus, including:
the backlight system comprises an optical film material, a light source board to be verified and a light receiving unit, wherein the optical film material is used for storing the light source board to be verified;
the image acquisition system is arranged opposite to the backlight system and is used for acquiring the image of the light emitting surface;
The control system is respectively and electrically connected with the backlight system and the image acquisition system, and is configured to receive the image acquired by the image acquisition system, determine whether the distance between the light source plate to be verified and the optical film material needs to be adjusted according to the image acquired by the image acquisition system, and if so, control the backlight system to adjust the distance between the light source plate to be verified and the optical film material.
Optionally, the backlight system comprises a fixing device, a containing device and an adjusting device;
the fixing device is used for fixing the optical film material, the accommodating device is used for accommodating the light source plate to be verified, and the light source plate to be verified is connected with the adjusting device;
the control system is configured to control the adjusting device to move the light source plate so as to adjust the distance between the light source plate and the optical film when the distance between the light source plate to be verified and the optical film needs to be adjusted.
Optionally, the control system includes a processor and a control module that are electrically connected to each other, where the processor is configured to determine, according to the image of the light emitting surface, whether the distance between the optical film and the light source plate needs to be adjusted, and if the distance needs to be adjusted, send an adjustment signal to the control module, and the control module sends a control signal to the adjustment device after receiving the adjustment signal, so as to control the adjustment device to move in a direction approaching or separating from the optical film.
Optionally, the accommodating device is provided with a cavity structure, and the light source plate to be verified is placed in the cavity;
the light source plate comprises a plurality of light plates, and at least four light plates are arranged in the accommodating device.
Optionally, the backlight system comprises a support structure, and the adjusting device comprises a motor electrically connected with the control system; the motor is respectively connected with the light source plate and the supporting structure.
Optionally, the image acquisition system comprises a CCD image sensor.
In a second aspect, an embodiment of the present application provides a backlight testing method, where the backlight testing method adopts the backlight testing apparatus in the embodiment of the present application, including:
controlling the distance between a light source plate and an optical film material to be a preset distance, and acquiring an image of a light emitting surface formed by the optical film material;
judging whether the image of the light-emitting surface meets a preset condition or not;
and if the preset condition is not met, adjusting the distance between the optical film and the light source plate until the image of the light emitting surface meets the preset condition.
Optionally, the obtaining the image of the light emitting surface formed by the optical film material includes:
and acquiring an image of the light-emitting surface by adopting a CCD image acquisition system, wherein the image of the light-emitting surface comprises the brightness of each pixel area.
Optionally, the determining whether the image of the light emitting surface meets a preset condition includes:
determining a maximum value and a minimum value of brightness in brightness of a plurality of pixel areas;
calculating a luminance difference between a maximum value of luminance and a minimum value of luminance as a global luminance difference;
and comparing the global brightness difference with a preset value, and judging that the image of the light emitting surface meets a preset condition if the global brightness difference is smaller than or equal to the preset value.
Optionally, if the global brightness difference is greater than a preset value, determining whether the image of the light emitting surface meets a preset condition, further includes:
calculating the brightness difference between any one pixel area and the pixel area adjacent to any one pixel area in the pixel areas as the brightness difference of the adjacent area;
and comparing the brightness difference of the adjacent area with a preset value, if the brightness difference of the adjacent area is smaller than or equal to the preset value, judging that the image of the light-emitting surface meets the preset condition, otherwise, judging that the image of the light-emitting surface does not meet the preset condition.
Optionally, if the preset condition is not met, adjusting the distance between the optical film and the light source plate until the image of the light emitting surface meets the preset condition, including:
Based on the current light mixing distance, increasing the distance between the optical film and the light source plate according to a preset first step length until the image of the light emitting surface meets a preset condition;
based on the current light mixing distance, reducing the distance between the optical film and the light source plate according to a preset second step length until the image of the light emitting surface does not meet preset conditions;
and increasing the distance between the optical film and the light source plate according to a preset third step length based on the current light mixing distance until the image of the light emitting surface meets a preset condition.
Optionally, if the preset condition is not met, adjusting the distance between the optical film and the light source plate until the image of the light emitting surface meets the preset condition, including:
based on the current light mixing distance, adjusting the distance between the optical film and the light source plate according to a preset first step length until the image of the light emitting surface meets the condition that the global brightness difference is smaller than or equal to the preset value;
based on the current light mixing distance, reducing the distance between the optical film and the light source plate according to a preset first step length until the image of the light emitting surface meets the condition that the global brightness difference is larger than the preset value;
Acquiring an image of the light-emitting surface, and judging whether the current image of the light-emitting surface meets the condition that the brightness difference of the adjacent area is smaller than or equal to the preset value; if the current light mixing distance is not met, increasing the distance between the optical film material and the light source plate according to a preset first step length until the current image of the light emitting surface meets that the brightness difference of the adjacent area is smaller than or equal to the preset value;
based on the current light mixing distance, reducing the distance between the optical film and the light source plate according to a preset second step length;
and acquiring the image of the light emitting surface, judging whether the current image of the light emitting surface meets the condition that the brightness difference of the adjacent area is smaller than or equal to the preset value, if not, increasing the distance between the optical film material and the light source plate according to a preset third step length based on the current light mixing distance until the current image of the light emitting surface meets the condition that the brightness difference of the adjacent area is smaller than or equal to the preset value.
The technical scheme provided by the embodiment of the application has the beneficial technical effects that:
the backlight testing device in the embodiment of the application comprises a backlight system, an image acquisition system and a control system; the backlight system comprises an optical film material, a light source plate and a light emitting surface, wherein the optical film material is used for storing the light source plate to be verified; the image acquisition system is arranged opposite to the backlight system and is used for acquiring the image of the light emitting surface, the control system is respectively and electrically connected with the backlight system and the image acquisition system and is configured to receive the image acquired by the image acquisition system and determine whether the distance between the light source plate to be verified and the optical film material needs to be adjusted according to the image acquired by the image acquisition system, and if the distance between the light source plate to be verified and the optical film material needs to be adjusted, the control system is controlled to adjust the distance between the light source plate to be verified and the optical film material. By using the backlight testing device provided by the embodiment of the application, the optimal light mixing distance of the backlight module can be rapidly determined by moving the light source plate and then carrying out image acquisition in the backlight testing process, thereby being beneficial to shortening the development period of the backlight module and reducing the development cost.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the geometrical relationship of the mixing distances;
FIG. 2 is a schematic diagram of a lamp panel;
FIG. 3 is a schematic diagram showing the effect of uneven display generated after a plurality of light panels are spliced into a light panel;
fig. 4 is a schematic structural diagram of a backlight testing device according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a backlight system in a backlight testing apparatus according to an embodiment of the present application;
FIG. 6 is a front view of a backlight system according to an embodiment of the present application;
FIG. 7 is a schematic image including a plurality of pixel regions;
fig. 8 is a flowchart of a backlight testing method according to an embodiment of the present application.
In the figure:
10-a backlight testing device; 11-a backlight system; 12-an image acquisition system; 13-a control system;
111-fixing means; 112-receiving means; 113-an adjustment device; 1130-an electric motor; 114-a support structure; 131-a processor; 132-a control module;
20-an optical film material; 201-a light-emitting surface; 21-a light source plate; 210-a lamp panel; 211-Mini-LED; 30-pixel area.
Detailed Description
The present application is described in detail below, examples of embodiments of the application are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. Further, if detailed description of the known technology is not necessary for the illustrated features of the present application, it will be omitted. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
The inventor of the present application considers that the optical effect of the direct type backlight module is closely related to the light mixing distance, and the backlight is not uniform if the light mixing distance is not proper. The light sources and the optical film materials 20 in different backlight modules are different, so that the required optimal light mixing distances are different for different backlight modules. As shown in fig. 1, the optimal theoretical value of the light mixing distance is calculated as:
in the formula (1), D is the distance between the lamp core of the Mini-LED211 and the optical film material 20, D0 is the distance between the bottom surface of the Mini-LED211 and the lamp core of the Mini-LED211, L is the distance between the two Mini-LEDs 211 (the distance between the two spaced Mini-LEDs), θ is twice the light emitting angle of the Mini-LED211, and H0 is the theoretical light mixing distance.
When the actual light mixing distance H in the backlight module is smaller than the theoretical light mixing distance H0, bright spots appear in the backlight on a macroscopic scale. If the light emitting angle of the Mini-LED211 in the actual product is different from the design light emitting angle, the actual light mixing distance H is different from the theoretical light mixing distance H0, which affects the optical quality of the backlight.
On the other hand, as shown in fig. 2 and 3, if the light source in the light source board 21 uses the Mini-LEDs 211, since the size of a single Mini-LED211 is small, the size of the light source board 210 formed by a plurality of Mini-LEDs 211 is also relatively small, and therefore, in a large-sized backlight module, it is necessary to splice a plurality of light source boards 210 including the Mini-LEDs 211 into one large-sized light source board 21. The gaps between the light source plates 21 are difficult to control (the gaps between the light source plates 21 may be different), so that the distances L between the Mini-LEDs 211 (the distances between the two spaced LEDs) are different, and the actual light mixing distances H and H0 of the backlight module are different, which macroscopically appears as uneven backlight, that is, a bright shadow or a dark shadow appears in the backlight (the dark shadow is at the joint of the two light source plates 21).
In the development process of the existing product, testing and verification are required to be performed on different backlight modules so as to determine the optimal light mixing distance for the different backlight modules, and the process is complicated. Firstly, a professional optical designer needs to calculate a theoretical value of the light mixing distance of a backlight module of a target product and manufacture a sample of the target product; then, the sample needs to be verified and evaluated to determine whether the theoretical value of the light mixing distance of the backlight module matches the actual value. In general, due to the limitation of factors such as processing and manufacturing level, the optical performance of each optical device in the backlight module has a certain difference from the theory, so that a designer is required to repeatedly modify and adjust relevant parts in the backlight module to determine the optimal light mixing distance of the backlight module. Thus leading to longer development cycle and higher cost of the product.
The application provides a backlight testing device and a backlight testing method, which aim to solve the technical problems in the prior art.
The backlight testing device and the backlight testing method provided by the embodiment of the application are described in detail below with reference to the accompanying drawings.
The structure of the backlight testing device 10 according to the embodiment of the present application is shown in fig. 4, and includes:
The backlight system 11 includes an optical film (not shown in the figure) for storing a light source board (not shown in the figure) to be verified, where the light source board to be verified is disposed opposite to the optical film, so that the optical film forms a light-emitting surface 201;
the image acquisition system 12 is arranged opposite to the backlight system 11 and is used for acquiring an image of the light emitting surface 201;
the control system 13 is electrically connected with the backlight system 11 and the image acquisition system 12 respectively, and is configured to receive the image acquired by the image acquisition system 12, determine whether the distance between the light source plate to be verified and the optical film material needs to be adjusted according to the image acquired by the image acquisition system 12, and if the distance between the light source plate to be verified and the optical film material needs to be adjusted, control the backlight system to adjust the distance between the light source plate to be verified and the optical film material.
Specifically, as shown in fig. 4 and fig. 5, an optical film 20 and a light source plate 21 to be verified are disposed in the backlight system 11, the optical film 20 includes a diffusion plate, the light source plate 21 includes a light plate 210 provided with a plurality of Mini-LEDs 211, and the light source plate 21 is disposed opposite to the optical film 20, so that light emitted by a plurality of point light sources on the light source plate 21 forms uniform backlight and is emitted from an light emitting surface 201 of the optical film 20. The distance between the light source plate 21 and the optical film 20 can be adjusted, and the distance between the light source plate 21 and the optical film 20 is the light mixing distance. The image capturing system 12 is disposed opposite to the light emitting surface 201 of the optical film 20 in the backlight system 11, so as to obtain an image of the light emitting surface 201 (i.e. a backlight image).
The control system 13 is electrically connected to the backlight system 11 and the image acquisition system 12, respectively, and in the process of testing the backlight, the image acquisition system 12 shoots the backlight system 11 to obtain an image of the light emitting surface 201, and sends the image of the light emitting surface 201 to the control system 13. The control system 13 processes and judges the received image, and controls and adjusts the distance between the optical film 20 and the light source plate 21 according to the judging result until the quality of the image meets the requirement, and at this time, the distance between the optical film 20 and the light source plate 21 is the optimal light mixing distance for the light source plate 21 and the optical film 20 in the current backlight system 11. The specific method of controlling and adjusting the distance between the optical film 20 and the light source plate 21 by the control system 13 according to the result of the judgment will be described in detail in the method section, and will not be described here again.
When the light source plate 21 and the optical film 20 are used for manufacturing the backlight module, the optimal light mixing distance obtained in the test can be used as the light mixing distance of the backlight module. By using the backlight testing device 10 in the embodiment of the application, the optimal light mixing distance of the backlight module can be rapidly determined by moving the light source plate 21 and then carrying out image acquisition in the backlight testing process, which is beneficial to shortening the development period of the backlight module and reducing the development cost. On the other hand, even a designer without optical knowledge can use the backlight testing device 10 in the embodiment of the application to conveniently and quickly determine the optimal light mixing distance of the direct type backlight module.
Alternatively, in an embodiment of the present application, as shown in connection with fig. 4 and 5, the backlight system 11 includes a fixing device 111, a receiving device 112, and an adjusting device 113. The fixing device 111 is used for fixing the optical film 20, the accommodating device 112 is used for accommodating the light source plate 21 to be verified, and the light source plate 21 to be verified is connected with the adjusting device 113. The control system 13 is configured to control the adjusting device 113 to move the light source plate 21 to adjust the distance between the light source plate 21 and the optical film 20 when the distance between the light source plate 21 to be verified and the optical film 20 needs to be adjusted.
Specifically, as shown in fig. 5, the fixing device 111 fixes the plurality of optical films 20 together, and the specific structure of the fixing device 111 can be adjusted according to practical situations. The housing means 112 is connected to the fixing means 111, the housing means 112 having a cavity structure in which the light source plate 21 to be verified is placed. The adjusting device 113 is connected to the light source plate 21, and can enable the light source plate 21 to move along the first direction in fig. 5, so as to adjust the distance between the light source plate 21 to be verified and the optical film 20. In the backlight test process, the control system 13 controls the image acquisition system 12 to acquire the image of the light emitting surface 201, and processes and judges the acquired image. If the image does not meet the requirement, the control system 13 controls the adjusting device 113 to move the light source plate 21 to change the distance between the light source plate 21 and the optical film 20 (i.e. the mixing distance).
Optionally, the backlight system 11 includes a support structure 114, the adjusting device 113 includes a motor 1130 electrically connected to the control system 13, the motor 1130 is connected to the light source board 21 and the support structure 114, and the support structure 114 is used for supporting and fixing the motor 1130. The motor 1130 is provided to move the light source plate 21, so that the process is easy to realize and the cost is low.
It should be noted that, the number of the motors 1130 may be adjusted according to the actual situation, as shown in fig. 5, the light source board 21 includes a plurality of light panels 210, and the motors 1130 are directly connected to the light panels 210, so that the number of the motors 1130 is the same as the number of the light panels 210. The plurality of lamp panels 210 may also be fixed to one larger fixing plate (not shown in fig. 5), and then the fixing plate is connected to the motor 1130, and the movement of the plurality of lamp panels 210 is achieved by moving the fixing plate, whereby the number of the motor 1130 may be reduced.
It should be noted that, changing the distance between the light source plate 21 and the optical film 20 may be achieved by fixing the optical film 20 and moving the light source plate 21, or may be achieved by fixing the light source plate 21 and moving the optical film 20; or the light source plate 21 and the optical film 20 are moved at the same time, so that the distance between the light source plate 21 and the optical film 20 is changed, which can be determined according to practical situations. The size of the accommodating device 112 may be adjusted according to practical situations, and optionally, as shown in fig. 5 and 6, the light source board 21 includes a plurality of light panels 210, and at least four light panels 210 are disposed in the accommodating device 112, that is, at least four light panels 210 may be disposed in the accommodating device 112. The light source in the backlight module is usually formed by splicing a plurality of lamp panels 210, and if the number of lamp panels 210 to be verified is too small in the backlight test, the actual backlight cannot be accurately reflected. By enabling the size of the accommodating device 112 to accommodate the four lamp panels 210, the four lamp panels 210 form a minimum unit of backlight, which not only accurately reflects the actual situation of the backlight, but also can avoid the oversized accommodating device 112, thereby being beneficial to reducing the manufacturing cost of the backlight testing device 10.
In an embodiment of the present application, as shown in fig. 4, the control system 13 includes a processor 131 and a control module 132 that are electrically connected to each other, where the processor 131 is configured to process an image sent from the image capturing system 12 to the control system 13, determine whether the image meets a preset condition, and if the image does not meet the preset condition, the processor 131 determines that the distance between the optical film 20 and the light source board 21 needs to be adjusted. The processor 131 can determine whether adjustment of the light mixing distance is required by analyzing the brightness of each pixel region 30 in the image. As shown in fig. 7, the image of the light-emitting surface 201 includes a plurality of pixel regions 30 (M rows, N columns, M and N are positive integers), and the brightness of the pixel regions 30 is Y MN (representing the brightness of pixels located in the M-th row and N-th column). Alternatively, image acquisition system 12 may be a Charge-coupled Device (CCD) image sensor. The photoelectric conversion device in CCD image sensor is based on MOS technologyThe imaging device is manufactured, has high sensitivity, can better acquire the image of the light-emitting surface 201, and is favorable for the subsequent analysis of the image by the processor 131.
The processor 131 analyzes the brightness of each pixel region 30 in the acquired image to determine the maximum value Y of the brightness in each pixel region 30 max And a minimum value Y of brightness min Then, the luminance difference between the maximum value of the luminance and the minimum value of the luminance is calculated as the global luminance difference Δy, the calculation formula of Δy is: Δy= |y max -Y min | a. The invention relates to a method for producing a fibre-reinforced plastic composite. The control system 13 pre-stores a preset value, the processor 131 compares the global brightness difference Δy with the preset value, and if the global brightness difference Δy is smaller than or equal to the preset value, it is determined that the brightness distribution of the image is relatively uniform at this time, that is, the image of the light-emitting surface 201 meets the preset condition. If the global brightness difference Δy is greater than the preset value, the processor 131 needs to further determine whether the image of the light-emitting surface 201 meets the preset condition. It should be noted that the specific value of the preset value can be determined according to the actual situation, and optionally, the preset value is 10cd/m 2 (brightness difference is less than 10 cd/m) 2 When the human eye is hard to distinguish the brightness difference).
Further, when the global brightness difference Δy of the image of the light-emitting surface 201 is greater than the preset value, further analysis can be performed on the image of the light-emitting surface 201 to make a more accurate determination on the quality (i.e. backlight uniformity) of the image of the light-emitting surface 201. Specifically, the luminance difference between any one pixel region 30 of the plurality of pixel regions 30 and the pixel region 30 adjacent to any one pixel region 30 is calculated as the adjacent region luminance difference; the brightness difference between adjacent areas and a preset value (10 cd/m 2 ) And comparing, if the brightness difference of the adjacent areas is smaller than or equal to the preset value, judging that the image of the light-emitting surface 201 meets the preset condition, otherwise, judging that the image of the light-emitting surface 201 does not meet the preset condition.
As shown in fig. 7, specifically, when the global luminance difference Δy of the image on the light-emitting surface 201 is greater than the preset value, the luminance of one pixel region 30 of the plurality of pixel regions 30 is determined to be Ymn (the luminance of the pixel of the nth row and the nth column), the luminance of the pixel is compared with the luminance of the pixel adjacent thereto, if |y m，n -Y m-1,n-1 |、|Y m，n -Y m-1,n |、|Y m，n -Y m-1,n+1 |、|Y m，n -Y m,n-1 |、|Y m，n -Y m-1,n+1 |、|Y m，n -Y m+1,n-1 |、|Y m，n -Y m+1,n |、|Y m，n -Y m+1,n+1 The i is smaller than or equal to the preset value, that is, the brightness difference values of the adjacent areas are smaller than or equal to the preset value, the processor 131 determines that the image of the light-emitting surface 201 meets the preset condition, or determines that the image of the light-emitting surface 201 does not meet the preset condition. By analyzing the adjacent brightness differences to judge whether the image of the light-emitting surface 201 meets the preset condition, the judgment error caused by judging the image quality by only analyzing the global brightness difference is avoided, and the judgment of the image is more accurate. Note that, when determining the luminance difference between the adjacent regions, a plurality of pixel regions 30 may be arbitrarily selected, and the luminance differences between the selected pixel region 30 and the regions adjacent thereto may be compared. In order to further improve the uniformity of the backlight, the brightness of each pixel region 30 may be compared with the brightness of the region adjacent to the pixel region when the brightness difference between the adjacent regions is determined, and the specific manner may be adjusted according to the actual situation.
When the image of the light-emitting surface 201 does not meet the preset condition, the processor 131 sends an adjustment signal to the control module 132, the control module 132 receives the adjustment signal and then sends a control signal to the adjustment device 113, so that the adjustment device 113 moves the light source plate 21 according to a set step length (i.e., a set distance) to change the distance between the light source plate 21 and the optical film 20, and after the distance between the light source plate 21 and the optical film 20 is changed, the image acquisition system 12 acquires the image of the light-emitting surface 201 again and sends the acquired image of the light-emitting surface 201 to the control system 13. The control system 13 analyzes and processes the currently acquired image, and determines whether the image satisfies a preset condition. The above process is repeated until the image satisfies the preset condition, and the distance between the light source plate 21 and the optical film 20 is the optimal light mixing distance.
Based on the same inventive concept, the embodiment of the present application further provides a backlight testing method, where the backlight testing device 10 in the embodiment of the present application is adopted, as shown in fig. 8, and the light testing method includes:
s101, controlling the distance between a light source plate and an optical film material to be a preset distance, and acquiring an image of a light emitting surface formed by the optical film material;
S102, judging whether the image of the light-emitting surface meets preset conditions or not;
and S103, if the preset condition is not met, adjusting the distance between the optical film material and the light source plate until the image of the light emitting surface meets the preset condition.
In the backlight testing method provided by the embodiment of the application, the control system 13 in the backlight testing device 10 is respectively electrically connected with the backlight system 11 and the image acquisition system 12, and is configured to receive the image acquired by the image acquisition system 12, determine whether the distance between the light source plate 21 to be verified and the optical film material 20 needs to be adjusted according to the image acquired by the image acquisition system 12, and if so, control the backlight system 11 to adjust the distance between the light source plate 21 to be verified and the optical film material 20. By using the backlight testing device 10 in the embodiment of the application, the optimal light mixing distance of the backlight module can be rapidly determined by moving the light source plate 21 and then carrying out image acquisition in the backlight testing process, which is beneficial to shortening the development period of the backlight module and reducing the development cost.
As shown in fig. 1, fig. 4, fig. 5, and fig. 7, specifically, in S101, controlling the distance between the light source board and the optical film to be a preset distance includes: in the backlight test, the theoretical light mixing distance H0 is calculated according to the parameters (the distance of the Mini-LED211, the light emission angle, etc.) of the light source board 21 to be verified. Then, the optical film 20 is fixed on the fixing device 111 in the backlight system 11, the light source plate 21 is placed in the accommodating device 112 of the backlight system 11, the light source plate 21 is connected with the adjusting device 113, and the distance between the light source plate 21 and the optical film 20 is the theoretical light mixing distance H0.
Specifically, in S101, acquiring an image of the light exit surface formed by the optical film material includes: acquiring an image of a light emitting surface by adopting a CCD image acquisition system, wherein the image of the light emitting surface comprises the brightness of each pixel area; in particular, the image capturing system 12 (may be a CCD image sensor) is disposed right in front of the backlight system 11, so that the image capturing system 12 captures an image of the light exit surface 201 on the optical film 20, and the image of the light exit surface 201 includes the brightness of each pixel region 30.
In an optional embodiment, the step S102 of determining whether the image of the light emitting surface meets the preset condition includes: determining a maximum value of luminance and a minimum value of luminance among the luminances of the plurality of pixel areas; calculating a luminance difference between a maximum value of luminance and a minimum value of luminance as a global luminance difference; and comparing the global brightness difference with a preset value, and if the global brightness difference is smaller than or equal to the preset value, judging that the image of the light emitting surface meets the preset condition.
Specifically, as shown in fig. 4, 5 and 7, after the image capturing system 12 acquires the image of the light emitting surface 201, the image information is sent to the processor 131 in the control system 13, and the processor 131 analyzes the brightness of each pixel area 30 in the acquired image to determine the maximum value Y of the brightness in each pixel area 30 max And a minimum value Y of brightness min Then, the luminance difference between the maximum value of the luminance and the minimum value of the luminance is calculated as the global luminance difference Δy, the calculation formula of Δy is: Δy= |y max -Y min | a. The invention relates to a method for producing a fibre-reinforced plastic composite. The control system 13 pre-stores a preset value, the processor 131 compares the global brightness difference Δy with the preset value, and if the global brightness difference Δy is smaller than or equal to the preset value, it is determined that the brightness distribution of the image is relatively uniform at this time, that is, the image of the light-emitting surface 201 meets the preset condition. It should be noted that the specific value of the preset value can be determined according to the actual situation, and optionally, the preset value is 10cd/m 2 (brightness difference is less than 10 cd/m) 2 When the human eye is hard to distinguish the brightness difference).
In another alternative embodiment, if the global brightness difference Δy is greater than a preset value, determining whether the image of the light emitting surface meets a preset condition further includes: calculating the brightness difference between any one pixel area and the pixel area adjacent to any one pixel area in the pixel areas as the brightness difference of the adjacent areas; and comparing the brightness difference of the adjacent areas with a preset value, if the brightness difference of the adjacent areas is smaller than or equal to the preset value, judging that the image of the light-emitting surface meets the preset condition, otherwise, judging that the image of the light-emitting surface does not meet the preset condition.
Specifically, when the global brightness difference Δy of the image of the light-emitting surface 201 is greater than the preset value, further analysis can be performed on the image of the light-emitting surface 201 to make a more accurate determination on the quality (i.e. backlight uniformity) of the image of the light-emitting surface 201. As shown in fig. 7, when the global luminance difference Δy of the image of the light-emitting surface 201 is greater than the preset value, the luminance of one pixel region 30 of the plurality of pixel regions 30 is determined to be Ymn (the luminance of the pixel of the nth row and the nth column), the luminance of the pixel is compared with the luminance of the adjacent pixel, if |y m，n -Y m-1,n-1 |、|Y m，n -Y m-1,n |、|Y m，n -Y m-1,n+1 |、|Y m，n -Y m,n-1 |、|Y m，n -Y m-1,n+1 |、|Y m，n -Y m+1,n-1 |、|Y m，n -Y m+1,n |、|Y m，n -Y m+1,n+1 The i is smaller than or equal to the preset value, that is, the brightness difference values of the adjacent areas are smaller than or equal to the preset value, the processor 131 determines that the image of the light-emitting surface 201 meets the preset condition, or determines that the image of the light-emitting surface 201 does not meet the preset condition. By analyzing the adjacent brightness differences to judge whether the image of the light-emitting surface 201 meets the preset condition, the judgment error caused by judging the image quality by only analyzing the global brightness difference is avoided, and the judgment of the image is more accurate.
In an alternative embodiment, the step S103 includes: based on the current light mixing distance, increasing the distance between the optical film and the light source plate according to a preset first step length until the image of the light emitting surface meets a preset condition; based on the current light mixing distance, reducing the distance between the optical film and the light source plate according to a preset second step length until the image of the light emitting surface does not meet the preset condition; and increasing the distance between the optical film and the light source plate according to a preset third step length based on the current light mixing distance until the image of the light emitting surface meets a preset condition.
As shown in fig. 5 and fig. 7, each time the light source plate 21 is moved to adjust the distance between the light source plate 21 and the optical film 20, the distance moved by the light source plate 21 may be adjusted according to practical situations. After adjusting the distance between the light source plate 21 and the optical film 20 once, the image capturing system 12 captures an image of the current light emitting surface 201 once, and the processor 131 analyzes and determines the current image (determines whether the global brightness difference and the brightness difference of the adjacent area are smaller than or equal to the preset value). When the image of the light-emitting surface 201 does not meet the preset condition (the global brightness difference and the adjacent area brightness difference are both greater than the preset value), the distance between the light source plate 21 and the optical film 20 is increased according to the preset first step length, which may be 10% H (light mixing distance), specifically, the current H is Hn (n=0, 1, 2 … … N), the first step length is Δhn (n=0, 1, 2 … … N), and Δhn=10%hn, based on the current light mixing distance, that is, the distance between the current light source plate 21 and the optical film 20. For example, after the image capturing system 12 captures the image of the light emitting surface 201 for the first time, the processor 131 determines that the image at this time does not meet the preset condition, the distance between the current light source plate 21 and the optical film 20 is H0 (i.e. the calculated theoretical light mixing distance), the distance between the light source plate 21 and the optical film 20 is increased according to Δh0, and after adjustment, the distance between the light source plate 21 and the optical film 20 is h0+Δh0, where Δh0 may be 10% H0. If the first adjusted image still does not meet the preset condition, the distance between the light source plate 21 and the optical film 20 needs to be increased continuously according to the preset first step, the current distance between the light source plate 21 and the optical film 20 is h1=h0+Δh0, the distance between the light source plate 21 and the optical film 20 is increased according to Δh1, and the distance between the light source plate 21 and the optical film 20 is h1+Δh1 after that, Δh1 may be 10% H1. Repeating the adjustment process until the image meets the preset condition.
When the image of the light-emitting surface 201 meets the preset condition, the distance between the light source plate 21 and the optical film 20 may not be the optimal light mixing distance in consideration of adjustment deviation and the like. Therefore, the light mixing distance needs to be adjusted back, that is, the distance between the light source plate 21 and the optical film 20 is reduced, and the adjustment value Δha=1/2 (Δhn), where Δha is a preset second step in the embodiment of the present application. For example, the image of the light-emitting surface 201 after the first adjustment satisfies the preset condition, where the distance between the light source plate 21 and the optical film 20 is h0+Δh0, and then the distance between the light source plate 21 and the optical film 20 is reduced by Δha, Δha=1/2 (Δh0). If abnormal display occurs after callback, that is, the image of the light emitting surface 201 does not meet the preset condition, the distance between the light source plate 21 and the optical film 20 is increased according to Δhb, where Δhb is a preset third step in the embodiment of the present application. When the image of the light-emitting surface 201 satisfies the preset condition again, the light mixing distance at this time can be considered as the optimal light mixing distance; according to the embodiment of the application, through the adjustment modes of increasing, decreasing and increasing again, the influence caused by adjustment deviation can be reduced, so that the value of the finally obtained optimal light mixing distance is more accurate.
In an alternative embodiment, the step S103 includes:
based on the current light mixing distance, adjusting the distance between the optical film and the light source plate according to a preset first step length until the image of the light emitting surface meets the condition that the global brightness difference is smaller than or equal to the preset value;
based on the current light mixing distance, reducing the distance between the optical film and the light source plate according to a preset first step length until the image of the light emitting surface meets the condition that the global brightness difference is larger than the preset value;
acquiring an image of the light-emitting surface, and judging whether the current image of the light-emitting surface meets the condition that the brightness difference of the adjacent area is smaller than or equal to the preset value; if the current light mixing distance is not met, increasing the distance between the optical film material and the light source plate according to a preset first step length until the current image of the light emitting surface meets that the brightness difference of the adjacent area is smaller than or equal to the preset value;
based on the current light mixing distance, reducing the distance between the optical film and the light source plate according to a preset second step length;
and acquiring the image of the light emitting surface, judging whether the current image of the light emitting surface meets the condition that the brightness difference of the adjacent area is smaller than or equal to the preset value, if not, increasing the distance between the optical film material and the light source plate according to a preset third step length based on the current light mixing distance until the current image of the light emitting surface meets the condition that the brightness difference of the adjacent area is smaller than or equal to the preset value.
As shown in fig. 5 and fig. 7, specifically, in the backlight testing process, if the global brightness difference of the light-emitting surface 201 is greater than the preset value, the distance between the optical film 20 and the light source plate 21 is increased and adjusted according to the first step (10% of the current light mixing distance). When the global brightness difference of the image on the light-emitting surface 201 is less than or equal to the preset value, the distance between the light source plate 21 and the optical film 20 may not be the optimal light mixing distance in consideration of adjustment deviation and other reasons. It is therefore necessary to make a callback to the mixing distance, i.e. gradually decrease the distance between the optical film 20 and the light source plate 21 in a first step size (10% of the current mixing distance). After adjusting the distance between the light source plate 21 and the optical film 20 once, the image acquisition system 12 acquires the current image of the light emitting surface 201 once, and the processor 131 analyzes and determines the current image until the global brightness difference of the image of the light emitting surface 201 is greater than or equal to the preset value.
Then, an image of the light-emitting surface 201 is collected, whether the brightness difference of the adjacent area of the image is smaller than or equal to a preset value is judged, if yes, the distance between the current light source plate 21 and the optical film material 20 is the optimal light mixing distance, if not, the distance between the light source plate 21 and the optical film material 20 is gradually increased according to a first step length (10% of the current light mixing distance), and the distance between the light source plate 21 and the optical film material 20 is adjusted until the brightness difference of the adjacent area of the image of the light-emitting surface 201 is smaller than or equal to the preset value.
And then, reducing the distance between the light source plate 21 and the optical film material 20 according to a second step length (5%Hn), and if the image still meets the condition that the brightness difference of the adjacent areas is smaller than or equal to a preset value, setting the distance between the current light source plate 21 and the optical film material 20 as the optimal light mixing distance. If not, increasing the distance between the light source plate 21 and the optical film 20 according to the third step (2.5% of the current light mixing distance) until the image satisfies that the brightness difference between the adjacent areas is less than or equal to the preset value, and the distance between the light source plate 21 and the optical film 20 is the optimal light mixing distance.
By applying the embodiment of the application, at least the following beneficial effects can be realized:
1. the backlight testing device 10 in the embodiment of the application comprises a backlight system 11, an image acquisition system 12 and a control system 13; the backlight system 11 includes an optical film 20 for storing a light source plate 21 to be verified, where the light source plate 21 to be verified is disposed opposite to the optical film 20, so that the optical film 20 forms a light-emitting surface 201; the image acquisition system 12 is disposed opposite to the backlight system 11, and is configured to acquire an image of the light emitting surface 201, and the control system 13 is electrically connected to the backlight system 11 and the image acquisition system 12, and is configured to receive the image acquired by the image acquisition system 12, and determine whether the distance between the light source plate 21 to be verified and the optical film 20 needs to be adjusted according to the image acquired by the image acquisition system 12. By using the backlight testing device 10 in the embodiment of the application, the optimal light mixing distance of the backlight module can be rapidly determined by moving the light source plate 21 and then carrying out image acquisition in the backlight testing process, which is beneficial to shortening the development period of the backlight module and reducing the development cost.
2. In the embodiment of the present application, by enabling the size of the accommodating device 112 to be capable of placing four lamp panels 210, the four lamp panels 210 form the minimum unit of the backlight, not only can accurately reflect the actual situation of the backlight, but also can avoid the oversized size of the accommodating device 112, which is beneficial to reducing the manufacturing cost of the backlight testing device 10.
3. In the embodiment of the present application, the image acquisition system 12 includes a CCD image sensor, which has high sensitivity, and can better acquire the image of the light-emitting surface 201, so as to facilitate the subsequent analysis of the image by the processor 131.
4. In the embodiment of the application, on the basis of analyzing the global brightness difference, whether the image of the light-emitting surface 201 meets the preset condition is judged by analyzing the adjacent brightness difference, so that the judgment error caused by judging the image quality by only analyzing the global brightness difference is avoided, and the judgment of the image is more accurate.
5. In the process of backlight verification, when the image of the light-emitting surface 201 meets the preset condition, the distance between the light source plate 21 and the optical film 20 is reduced according to the current light mixing distance, and then the distance between the light source plate 21 and the optical film 20 is increased according to the adjusted light mixing distance (the current light mixing distance), so that the influence caused by adjustment deviation can be reduced, and the value of the finally obtained optimal light mixing distance is more accurate.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
The foregoing is only a partial embodiment of the application, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the application, and such modifications and adaptations are intended to be comprehended within the scope of the application.

Claims (12)

1. A backlight testing apparatus, comprising:
the backlight system comprises an optical film material, a light source board to be verified and a light receiving unit, wherein the optical film material is used for storing the light source board to be verified;
the image acquisition system is arranged opposite to the backlight system and is used for acquiring the image of the light emitting surface;
the control system is respectively and electrically connected with the backlight system and the image acquisition system, and is configured to receive the image acquired by the image acquisition system, determine whether the distance between the light source plate to be verified and the optical film material needs to be adjusted according to the image acquired by the image acquisition system, and if so, control the backlight system to adjust the distance between the light source plate to be verified and the optical film material.
2. The backlight testing device of claim 1, wherein the backlight system comprises a fixture, a receiver, and an adjustment device;
The fixing device is used for fixing the optical film material, the accommodating device is used for accommodating the light source plate to be verified, and the light source plate to be verified is connected with the adjusting device;
the control system is configured to control the adjusting device to move the light source plate so as to adjust the distance between the light source plate and the optical film when the distance between the light source plate to be verified and the optical film needs to be adjusted.
3. The backlight testing device according to claim 2, wherein the control system comprises a processor and a control module which are electrically connected with each other, the processor is configured to determine whether the distance between the optical film and the light source plate needs to be adjusted according to the image of the light emitting surface, if so, the control module sends an adjusting signal to the control module, and the control module sends a control signal to the adjusting device after receiving the adjusting signal so as to control the adjusting device to move towards or away from the optical film.
4. The backlight testing device of claim 2, wherein the receiving device has a cavity structure in which the light source board to be verified is placed;
The light source plate comprises a plurality of light plates, and at least four light plates are arranged in the accommodating device.
5. The backlight testing device of claim 2, wherein the backlight system comprises a support structure, the adjustment device comprising a motor electrically connected to the control system; the motor is respectively connected with the light source plate and the supporting structure.
6. A backlight testing device according to any one of claims 1 to 5, wherein the image acquisition system comprises a CCD image sensor.
7. A backlight testing method using the backlight testing apparatus of any one of claims 1 to 6, comprising:
controlling the distance between a light source plate and an optical film material to be a preset distance, and acquiring an image of a light emitting surface formed by the optical film material;
judging whether the image of the light-emitting surface meets a preset condition or not;
and if the preset condition is not met, adjusting the distance between the optical film and the light source plate until the image of the light emitting surface meets the preset condition.
8. The backlight testing method according to claim 7, wherein the obtaining the image of the light-emitting surface formed by the optical film material comprises:
And acquiring an image of the light-emitting surface by adopting a CCD image acquisition system, wherein the image of the light-emitting surface comprises the brightness of each pixel area.
9. The backlight testing method according to claim 8, wherein the determining whether the image of the light-emitting surface meets a preset condition comprises:
determining a maximum value and a minimum value of brightness in brightness of a plurality of pixel areas;
calculating a luminance difference between a maximum value of luminance and a minimum value of luminance as a global luminance difference;
and comparing the global brightness difference with a preset value, and judging that the image of the light emitting surface meets a preset condition if the global brightness difference is smaller than or equal to the preset value.
10. The backlight testing method according to claim 9, wherein if the global brightness difference is greater than a preset value, determining whether the image of the light emitting surface meets a preset condition further comprises:
calculating the brightness difference between any one pixel area and the pixel area adjacent to any one pixel area in the pixel areas as the brightness difference of the adjacent area;
and comparing the brightness difference of the adjacent area with a preset value, if the brightness difference of the adjacent area is smaller than or equal to the preset value, judging that the image of the light-emitting surface meets the preset condition, otherwise, judging that the image of the light-emitting surface does not meet the preset condition.
11. The backlight testing method according to claim 10, wherein if the preset condition is not satisfied, adjusting the distance between the optical film and the light source plate until the image of the light emitting surface satisfies the preset condition comprises:
based on the current light mixing distance, increasing the distance between the optical film and the light source plate according to a preset first step length until the image of the light emitting surface meets a preset condition;
based on the current light mixing distance, reducing the distance between the optical film and the light source plate according to a preset second step length until the image of the light emitting surface does not meet preset conditions;
and increasing the distance between the optical film and the light source plate according to a preset third step length based on the current light mixing distance until the image of the light emitting surface meets a preset condition.
12. The backlight testing method according to claim 10, wherein if the preset condition is not satisfied, adjusting the distance between the optical film and the light source plate until the image of the light emitting surface satisfies the preset condition comprises:
based on the current light mixing distance, adjusting the distance between the optical film and the light source plate according to a preset first step length until the image of the light emitting surface meets the condition that the global brightness difference is smaller than or equal to the preset value;
Based on the current light mixing distance, reducing the distance between the optical film and the light source plate according to a preset first step length until the image of the light emitting surface meets the condition that the global brightness difference is larger than the preset value;
acquiring an image of the light-emitting surface, and judging whether the current image of the light-emitting surface meets the condition that the brightness difference of the adjacent area is smaller than or equal to the preset value; if the current light mixing distance is not met, increasing the distance between the optical film material and the light source plate according to a preset first step length until the current image of the light emitting surface meets that the brightness difference of the adjacent area is smaller than or equal to the preset value;
based on the current light mixing distance, reducing the distance between the optical film and the light source plate according to a preset second step length;
and acquiring the image of the light emitting surface, judging whether the current image of the light emitting surface meets the condition that the brightness difference of the adjacent area is smaller than or equal to the preset value, if not, increasing the distance between the optical film material and the light source plate according to a preset third step length based on the current light mixing distance until the current image of the light emitting surface meets the condition that the brightness difference of the adjacent area is smaller than or equal to the preset value.
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