CN218848505U - Lighting module and light box jig - Google Patents
Lighting module and light box jig Download PDFInfo
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Abstract
The utility model discloses a lighting module and a light box jig, wherein the lighting module comprises a lighting source, a brightness adjusting module, an impedance matching module and a power module, wherein the brightness adjusting module comprises a brightness signal collecting unit; the preprocessing unit is connected with the brightness acquisition unit so as to convert the brightness signal acquired by the brightness signal acquisition unit into a brightness value; the brightness compensation unit is connected with the preprocessing unit to receive the brightness value output by the preprocessing unit and calculate a brightness compensation value according to the brightness value and the image signal; and the signal control unit is connected with the brightness compensation unit and the impedance matching module so as to generate a lighting control signal according to the brightness compensation value and control the impedance matching module to match corresponding impedance according to the lighting control signal. According to the scheme, the problem of light source attenuation of the point light source is not required to be considered, the brightness of the point light source is compensated to the optimal brightness value through the brightness compensation unit, and the difference of the point light test result of the point light source due to the light source attenuation is made up.
Description
Technical Field
The utility model relates to a show technical field, especially relate to a module and light box tool of lighting a lamp.
Background
A Liquid Crystal Display (LCD) has the advantages of good picture quality, small size, light weight, low power consumption, low cost, and the like, and is widely used in the field of flat panel display.
The liquid crystal display device comprises a backlight module and a display panel, and a plurality of testing links are usually set to detect the display effect of the display panel in the production process of the display panel so as to ensure the performance of the display panel. The lighting test is an important test link in a plurality of test links, and the poor display of the display panel is detected by adopting the lighting source simulation backlight module. However, the lighting source has a light source attenuation phenomenon, the lighting source needs to be checked, the checking period is long (usually, the checking is performed at least once every month), and the problem that the test effect is reduced due to abnormal light source is easily caused, so that the bad phenomenon that the display panel cannot be found in time is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a module and light box tool of lighting a lamp to reduce the problem of test effect because of the light source is unusual among the solution prior art.
According to the utility model discloses an aspect provides a module of lighting a lamp for test of lighting a lamp to display panel, this module of lighting a lamp includes: the device comprises a point lamp source, a brightness adjusting module, an impedance matching module and a power module, wherein the impedance matching module is connected in series in a connecting path of the power module and the point lamp source, and the brightness adjusting module is used for acquiring a real-time brightness signal of the point lamp source and adjusting the brightness of the point lamp source according to the brightness signal and an image signal; wherein the brightness adjusting module comprises:
the brightness signal acquisition unit is connected with the lighting source;
the preprocessing unit is connected with the brightness acquisition unit so as to convert the brightness signal acquired by the brightness signal acquisition unit into a brightness value;
the brightness compensation unit is connected with the preprocessing unit to receive the brightness value output by the preprocessing unit and calculate a brightness compensation value according to the brightness value and the image signal;
and the signal control unit is connected with the brightness compensation unit and the impedance matching module so as to generate a lighting control signal according to the brightness compensation value and control the impedance matching module to match corresponding impedance according to the lighting control signal.
Optionally, the lighting module further includes a feedback analysis module, and the feedback analysis module is connected to the power module to receive the reflected light of the display panel and determine the abnormal pixel of the display panel according to the received reflected light.
Optionally, the lighting module further includes a display module, and the display module is connected to the brightness signal collecting unit or the preprocessing unit to display the brightness information of the lighting source;
the display module is also connected with the feedback analysis module to display the abnormal pixel points output by the feedback analysis module.
Optionally, the impedance matching module includes a multiplexer and a plurality of resistor units, the multiplexer includes a plurality of connection channels, and the connection channels are connected to the resistor units in a one-to-one correspondence;
the input end of the signal control unit is connected with the output end of the brightness compensation unit, the output end of the signal control unit is connected with the control end of the multiplexer, the input end of a connecting channel of the multiplexer is connected with the first end of the power supply module, the output end of the connecting channel of the multiplexer is correspondingly connected with the first end of the resistor unit, the second end of the resistor unit is connected with the first end of the lighting source, and the second end of the lighting source is connected with the second end of the power supply module.
Alternatively, the resistance values of the plurality of resistance units are different from each other.
Optionally, the connection channels of the multiplexer at least include a maximum grayscale display channel, a minimum grayscale display channel, a preset grayscale display channel, and a three primary color display channel.
Optionally, the luminance signal acquisition unit includes a luminance signal transmitting subunit and a luminance signal receiving subunit;
the input end of the brightness signal transmitting subunit is connected with the lighting source, the output end of the brightness signal transmitting subunit is connected with the input end of the brightness signal receiving subunit, the output end of the brightness signal receiving subunit is connected with the input end of the preprocessing unit, and the output end of the preprocessing unit is connected with the input end of the brightness compensation unit.
Optionally, the pre-processing unit comprises an optical sensor.
Optionally, the lighting module further includes a light guide plate and a diffusion sheet, the light guide plate is located on the light exit side of the lighting source, and the diffusion sheet is located on the side of the light guide plate away from the lighting source.
According to the utility model discloses an on the other hand provides a light box tool, including the box with the utility model discloses the module of lighting a lamp that arbitrary embodiment provided, the module of lighting a lamp set up in the box.
The embodiment of the utility model provides a technical scheme, gather the real-time luminance signal in point lamp source through luminance signal acquisition unit, and the luminance signal transmission who will gather to the preprocessing unit in, preprocessing unit converts received luminance signal into the luminance value and exports to the luminance compensation unit, the luminance compensation unit calculates the required best luminance value of display panel that awaits measuring based on image signal and luminance compensation value, and calculate the luminance compensation value according to the best luminance value that obtains, signal control module generates the control signal of lighting a lamp according to the luminance compensation value, with the impedance of control impedance matching module regulation point lamp source place circuit, thereby change the electric current or the voltage in point lamp source, and then adjusted the luminance in point lamp source. Because the real-time brightness value of the point lamp source is taken as the reference for adjustment, the problem of light source attenuation of the point lamp source does not need to be considered in the scheme, even if the point lamp source has light source attenuation, the brightness of the point lamp source can be compensated to the optimal brightness value through the brightness compensation unit, the difference of the point lamp test result caused by the light source attenuation when the point lamp source is not detected in time is made up, the accuracy of the test result is improved, the point detection period of the point lamp source is further prolonged, and the cost is reduced.
It should be understood that the statements herein are not intended to identify key or critical features of any embodiment of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will be readily apparent from the following specification.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained without creative efforts.
Fig. 1 is a schematic structural diagram of a lighting module according to an embodiment of the present invention;
fig. 2 is an exploded schematic view of a lighting module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another lighting module according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a light reflection comparison according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another lighting module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another lighting module according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an impedance matching module according to an embodiment of the present invention;
fig. 8 is a schematic view of another lighting module according to an embodiment of the present invention
Fig. 9 is an exploded schematic view of another lighting module according to an embodiment of the present invention.
Reference numerals are as follows:
1-a first circuit board; 2-a second circuit board; 3-a display panel; 4-a light guide plate; 5, a diffusion sheet;
10-point lamp source;
20-a brightness adjustment module; 201-a brightness signal acquisition unit; 202-a pre-processing unit; 203-a brightness compensation unit; 204-a signal control unit; 2011-luminance signal emitting subunit; 2012-luminance signal receiving subunit;
30-an impedance matching module; 301-a multiplexer; r1-a first resistance unit; r2 — a second resistance unit; r3 — a third resistance unit; r4 — a fourth resistance unit;
40-a power supply module; 50-a feedback analysis module; 60-display module.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
Fig. 1 is a schematic structural diagram of a lighting module according to an embodiment of the present invention, which is used for lighting a display panel (e.g., a liquid crystal display panel) to detect whether the display panel has a display defect or not. Referring to fig. 1, the lighting module provided in this embodiment includes: the lighting device comprises a lighting source 10, a brightness adjusting module 20, an impedance matching module 30 and a power module 40, wherein the impedance matching module 30 is connected in series in a connection path between the power module 40 and the lighting source 10, and the brightness adjusting module 20 is used for acquiring a real-time brightness signal of the lighting source 10 and adjusting the brightness of the lighting source 10 according to the brightness signal and an image signal; the brightness adjusting module 20 includes:
the brightness signal acquisition unit 201 is connected to the lighting source 10, and specifically can be connected to one end of the lighting source 10 connected to the power module 40, and the power module 40 provides power voltage for the lighting source 10 and the brightness signal acquisition unit 201, and can also provide power voltage for other modules in the module. The brightness signal collecting unit 201 is configured to collect a brightness signal (in other embodiments, an illumination signal) of the lighting source 10 when the lighting source 10 emits light.
The preprocessing unit 202 is connected to the brightness acquisition unit 201, and is configured to preprocess the brightness signal acquired by the brightness acquisition unit 201, so as to convert the brightness signal acquired by the brightness acquisition unit 201 into a corresponding electrical signal to obtain a brightness value corresponding to the brightness signal. The brightness signal is an optical signal, and the preprocessing unit 202 can convert the optical signal into an electrical signal for the back-end circuit to use.
And the brightness compensation unit 203 is connected with the preprocessing unit 202 to receive the brightness value output by the preprocessing unit 202 and calculate a brightness compensation value according to the brightness value and the image signal. Wherein the image signal is provided to the IC in the display panel, the brightness compensation unit 203 can determine the current display image data of the display panel under test according to the image signal received by the brightness compensation unit, and calculate the brightness compensation value based on the brightness value of the lighting source 10 and the image signal to compensate the brightness of the lighting source.
In this embodiment, the brightness compensation unit 203 determines the current display gray scale of the display panel to be tested according to the received image signal, and determines the optimal brightness value of the backlight based on the display gray scale, and then the brightness compensation unit 203 determines the brightness compensation value by combining the current brightness value of the lighting source 10 output by the preprocessing unit 202, so as to compensate the brightness value of the lighting source 10 to the optimal brightness value. Illustratively, the target brightness value of the lighting source 10 is 3000 cd/square meter, but the current brightness value of the lighting source 10 is lower than the target brightness value due to the light source attenuation of the lighting source 10, which is only 2700 cd/square meter, and thus the lighting requirement cannot be met. The luminance compensation unit 203 calculates the best luminance value of the backlight required by the display panel to be tested at present according to the received image signal, which is 6000 cd/square meter, and then the luminance compensation unit 203 calculates the difference value between the current luminance value and the best luminance value of the point light source 10, which is 3300 cd/square meter, and takes the difference value as the luminance compensation value. If the brightness compensation unit 203 determines that the optimal brightness value of the backlight required by the display panel to be tested is 500cd per square meter according to the received image signal, the brightness compensation value is calculated to be-2200 cd per square meter. The brightness compensation unit 203 can perform compensation of different brightness according to the real-time brightness of the light source 10.
And the signal control unit 204 is connected with the brightness compensation unit 203 and the impedance matching module 30, after the brightness compensation unit 203 calculates a brightness compensation value, the brightness compensation value is sent to the signal control unit 204, the signal control unit 204 generates a lighting control signal according to the brightness compensation value, and sends the lighting control signal to the control end of the impedance matching module 30 so as to control the impedance matching module 30 to match the corresponding impedance.
The impedance matching module 30 is controlled to match the corresponding impedance, that is, the impedance matching module 30 can adjust the line impedance of the loop where the lighting source 10 is located according to the lighting control signal, so as to adjust the current or voltage of the line, so as to change the light emitting brightness of the lighting source 10, and make the light emitting brightness of the lighting source 10 reach the brightness compensated by the brightness compensation unit 203.
The embodiment of the utility model provides a technical scheme, gather the real-time luminance signal in point lamp source through luminance signal acquisition unit, and the luminance signal transmission who will gather to the preprocessing unit in, preprocessing unit converts received luminance signal into the luminance value and exports to the luminance compensation unit, the luminance compensation unit calculates the required best luminance value of display panel that awaits measuring based on image signal and luminance compensation value, and calculate the luminance compensation value according to the best luminance value that obtains, signal control module generates the control signal of lighting a lamp according to the luminance compensation value, with the impedance of control impedance matching module regulation point lamp source place circuit, thereby change the electric current or the voltage in point lamp source, and then adjusted the luminance in point lamp source. Because the real-time brightness value of the point lamp source is taken as the reference for adjustment, the problem of light source attenuation of the point lamp source does not need to be considered in the scheme, even if the point lamp source has light source attenuation, the brightness of the point lamp source can be compensated to the optimal brightness value through the brightness compensation unit, the difference of the point lamp test result caused by the light source attenuation when the point lamp source is not detected in time is made up, the accuracy of the test result is improved, the point detection period of the point lamp source is further prolonged, and the cost is reduced.
Fig. 2 is an explosion structure diagram of a lighting module according to an embodiment of the present invention, referring to fig. 1 and fig. 2, on the basis of the above technical solution, optionally, the brightness adjusting module 20 may be disposed on the first circuit board 1, and the power module 40, the lighting source 10 and the impedance matching module 30 may be disposed on the second circuit board 2, so that a loop is formed among the power module 40, the lighting source 10 and the impedance matching module 30. The first circuit board 1 and the second circuit board 2 may be placed in a stack. When the lighting test is performed, the display panel 3 is disposed on a side of the second circuit board 2 away from the first circuit board 1, that is, the display panel 3 is disposed on the light emitting side of the lighting source 10.
Of course, in other embodiments, only the lighting source 10 may be disposed on the second circuit board 2, and the brightness adjusting module 20, the impedance matching module 30, and the power supply module 40 may be disposed on the first circuit board 1.
In an actual circuit, the power module 40 includes a positive electrode and a negative electrode, and the positive electrode of the power module 40, the lighting source 10, the impedance matching module 30, and the negative electrode of the power module 40 are connected in sequence to form a loop.
Fig. 3 is a schematic diagram of a principle structure of another lighting module according to an embodiment of the present invention, referring to fig. 2 and fig. 3, on the basis of the above technical solutions, optionally, the lighting module further includes a feedback analysis module 50, and the feedback analysis module 50 may be disposed on a backlight side of the lighting source 10 to receive reflected light (shown by a dotted arrow in fig. 2) of the display panel 3, and determine an abnormal pixel point of the display panel 3 according to the received reflected light. Wherein the power module 40 may be configured to provide a power voltage to the feedback analysis module 50.
The feedback analysis module 20 forms bad pixels or location points in the feedback display panel 3 by coordinates.
Specifically, when a lighting test is performed, light emitted from the lighting source 10 is irradiated onto the display panel 3, and the feedback analysis module 50 receives and analyzes reflected light of the display panel 3. The pixels in the display panel 3 are arranged in an array, and each pixel corresponds to a pixel coordinate. When the display panel 3 displays a screen, if a display failure occurs, the reflected light may be defective or broken, and abnormal light may be generated.
In the present embodiment, the feedback analysis module 50 analyzes the reflected light to determine the coordinates of the pixel points corresponding to the display defect, so as to find the defect of the display panel 3 in time. Fig. 4 is a schematic diagram showing the light reflection contrast provided by the embodiment of the present invention, referring to fig. 4, the S1 waveform is the normal light reflection condition, and there is no break-off in the S1 waveform, which indicates that there is no bad display phenomenon in the display panel 3. The S2 waveform is an abnormal light reflection condition, and the reflection breakpoint exists in the S2 waveform, so that the waveform is abnormal, and the feedback analysis module 50 determines the abnormal pixel point by determining the coordinate of the reflection breakpoint. Compared with the technical scheme of adopting the bad phenomenon of the handheld instrument monitoring panel in the prior art, the scheme can realize autonomous monitoring, is favorable for reducing errors caused by human factors, and reduces the readjustment risk of equipment.
In the present embodiment, the display defects include defects such as dark spots/lines, bright spots/lines, polarizer foreign matter, mura, and the like. In this embodiment, the brightness of the lighting source 10 is compensated to the optimal brightness value of the current display screen, and different brightness values are adjusted according to image quality requirements, so that the undesirable phenomenon of the display panel 3 is more easily detected, thereby being beneficial to reducing the quality hidden trouble of the display panel 3.
Fig. 5 is a schematic structural diagram of another lighting module according to an embodiment of the present invention, fig. 6 is a schematic structural diagram of another lighting module according to an embodiment of the present invention, referring to fig. 5 and fig. 6, on the basis of the above technical solutions, the lighting module further includes a display module 60, and the display module 60 is connected to the luminance signal collecting unit 201 or the preprocessing unit 202 to display luminance information of the lighting source 10; the display module 60 is further connected to the feedback analysis module 50 to display the abnormal pixel points output by the feedback analysis module 50. The brightness information may be a real-time brightness value of the lighting source 10, may also be a brightness compensation value, or may include both a brightness value and a brightness compensation value. Through setting up display module assembly 60, can realize the visual of point lamp source 10 luminance, can real time monitoring point lamp source 10's luminance change, can also monitor display panel 3 simultaneously and whether have the bad phenomenon of demonstration to and show the position point coordinate that bad correspondence.
Fig. 7 is a schematic structural diagram of an impedance matching module according to an embodiment of the present invention, referring to fig. 5 and 7, an input end A1 of the impedance matching module 30 is connected to one end of the power module 40, and an output end A2 of the impedance matching module 30 is connected to the lighting source 10; alternatively, the input terminal A1 of the impedance matching module 30 is connected to the lighting source 10, and the output terminal A2 of the impedance matching module 30 is connected to one end of the power supply module 40. The control terminal A3 of the impedance matching module 30 is connected to the output terminal of the signal control unit 204.
The impedance matching module 30 includes a multiplexer 301 and a plurality of resistor units (e.g., a first resistor unit R1/a second resistor unit R2, a third resistor unit R3, and a fourth resistor unit R4 … …), where the multiplexer 301 includes a plurality of connection channels, and the connection channels are connected to the resistor units in a one-to-one correspondence manner. For example, the multiplexer 301 includes a selection switch, each shift position of the selection switch is a connection channel, each connection channel is correspondingly connected with a resistor unit, and when the selection switch is connected to a shift position, the resistor unit corresponding to the shift position is connected in series in a loop.
As an optional implementation manner in this embodiment, an input end of the signal control unit 204 is connected to an output end of the brightness compensation unit 203, an output end of the signal control unit 204 is connected to a control end of the multiplexer 301, an input end of a connection channel of the multiplexer 301 is connected to a first end of the power module 40, an output end of the connection channel of the multiplexer 301 is correspondingly connected to a first end of the resistor unit, a second end of the resistor unit is connected to a first end of the lighting source 10, and a second end of the lighting source 10 is connected to a second end of the power module 40.
Specifically, the resistance values of the plurality of resistance units are different from each other, and each resistance unit corresponds to one resistance value so as to adjust the current of the loop in which the node lamp 10 is located. The number of connection channels of the multiplexer 301 may be set according to actual requirements. This embodiment is described by taking 4 connection channels as an example. The first connection channel of the multiplexer 301 is the maximum gray scale display channel and is connected with the first resistance unit R1; the second connecting channel is a minimum gray scale display channel and is connected with the second resistance unit R2; the third connecting channel is a preset gray scale display channel and is connected with the third resistor unit R3, wherein the preset gray scale is between the maximum gray scale and the minimum gray scale; the fourth connecting channel is a display channel of three primary colors (red, green and blue) and is connected with the fourth resistance unit R4.
Exemplarily, when lighting, the brightness compensation unit 203 determines that the display image of the display panel to be tested is a full white image (corresponding to a maximum display gray scale) according to the received image signal, calculates an optimal brightness value of the backlight required by the full white image, and obtains a brightness compensation value under the full white image according to the obtained current brightness value of the lighting source 10 and the calculated optimal brightness value. The signal control unit 204 generates a first spotlight control signal according to the brightness compensation value to control the multiplexer 301 to select the first connection channel, and the first resistor unit R1 is connected to the loop of the spotlight source 10 to adjust the loop current, so as to adjust the brightness of the spotlight source 10. If the brightness compensation unit 203 determines that the display frame of the display panel to be tested is a preset gray scale frame (for example, 150 gray scales) according to the received image signal, the optimal brightness value of the backlight required by the preset gray scale frame is calculated, and a brightness compensation value under the preset gray scale frame is obtained according to the obtained current brightness value of the lighting source 10 and the calculated optimal brightness value. The signal control unit 204 generates a third lamp control signal according to the brightness compensation value to control the multiplexer 301 to select a third connection channel, and the third resistance unit R3 is connected to the loop of the point light source 10 to adjust the loop current, so as to adjust the brightness of the point light source 10.
The process of selecting the second connection channel and the fourth connection channel is similar to the above description, and specific reference may be made to the description of the first connection channel and the third connection channel, which is not described herein again.
Fig. 8 is a schematic structural diagram of another lighting module according to an embodiment of the present invention, and referring to fig. 8, on the basis of the foregoing technical solutions, optionally, the luminance signal collecting unit 201 includes a luminance signal transmitting subunit 2011 and a luminance signal receiving subunit 2012; the input end of the luminance signal emission subunit 2011 is connected to one end of the lighting source 10 connected to the power supply module 40, the output end of the luminance signal emission subunit 2011 is connected to the input end of the luminance signal receiving subunit 2012, the output end of the luminance signal receiving subunit 2012 is connected to the input end of the preprocessing unit 202, and the output end of the preprocessing unit 202 is connected to the input end of the luminance compensation unit 203. The luminance signal transmitting subunit 2011 is configured to collect luminance signals of the point light sources 10, and transmit the collected luminance signals, so that the luminance signal receiving subunit 2012 and/or the display module 60 receive the luminance signals. The luminance signal receiving sub-unit 2012 processes the received luminance signal so that the pre-processing unit 202 can receive it.
In this embodiment, the pre-processing unit 202 includes an optical sensor to convert the received optical signal into an electrical signal to facilitate the operation of the back-end module.
Fig. 9 is an exploded schematic view of another lighting module according to an embodiment of the present invention, referring to fig. 9, the lighting module further includes a light guide plate 4 and a diffusion sheet 5, the light guide plate 4 is located on the light emitting side of the lighting source 10, and the diffusion sheet 5 is located on the side of the light guide plate 4 away from the lighting source 10. The light source 10 may be an LED light source, and light emitted from the light source 10 is uniformly emitted out of the lighting module through an optical film such as a light guide plate 4 and a diffusion sheet 5.
Optionally, the utility model also provides a light box tool, including the box with the utility model discloses the module of lighting a lamp that arbitrary embodiment provided sets up in light box tool's box, and this light box tool is used for realizing the test of lighting a lamp of display panel. Because the embodiment of the utility model provides a light box tool includes the utility model discloses the module of lighting a lamp that arbitrary embodiment provided, consequently this display device also possesses the beneficial effect that above-mentioned arbitrary embodiment described, no longer gives unnecessary details.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, may be executed sequentially, or may be executed in different orders, as long as the desired result of the technical solution of the present invention can be achieved, and the present invention is not limited thereto.
The above detailed description does not limit the scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a lamp module for to the display panel test of lighting a lamp, its characterized in that includes: the device comprises a point lamp source, a brightness adjusting module, an impedance matching module and a power module, wherein the impedance matching module is connected in series in a connecting path of the power module and the point lamp source, and the brightness adjusting module is used for acquiring a real-time brightness signal of the point lamp source and adjusting the brightness of the point lamp source according to the brightness signal and an image signal; wherein the brightness adjusting module comprises:
the brightness signal acquisition unit is connected with the lighting source;
the preprocessing unit is connected with the brightness acquisition unit so as to convert the brightness signal acquired by the brightness signal acquisition unit into a brightness value;
the brightness compensation unit is connected with the preprocessing unit to receive the brightness value output by the preprocessing unit and calculate a brightness compensation value according to the brightness value and the image signal;
and the signal control unit is connected with the brightness compensation unit and the impedance matching module, generates a lighting control signal according to the brightness compensation value, and controls the impedance matching module to match corresponding impedance according to the lighting control signal.
2. The lighting module of claim 1, further comprising a feedback analysis module connected to the power module for receiving the reflected light from the display panel and determining abnormal pixels of the display panel according to the received reflected light.
3. The lighting module of claim 2, further comprising a display module, wherein the display module is connected to the brightness signal collecting unit or the preprocessing unit to display brightness information of the lighting source;
the display module is also connected with the feedback analysis module to display the abnormal pixel points output by the feedback analysis module.
4. The lighting module of claim 1, wherein the impedance matching module includes a multiplexer and a plurality of resistor units, the multiplexer including a plurality of connection channels, the plurality of connection channels being connected to the plurality of resistor units in a one-to-one correspondence;
the input end of the signal control unit is connected with the output end of the brightness compensation unit, the output end of the signal control unit is connected with the control end of the multiplexer, the input end of a connecting channel of the multiplexer is connected with the first end of the power supply module, the output end of the connecting channel of the multiplexer is correspondingly connected with the first end of the resistor unit, the second end of the resistor unit is connected with the first end of the lighting source, and the second end of the lighting source is connected with the second end of the power supply module.
5. The lighting module of claim 4, wherein the plurality of resistor units have different impedance values.
6. The lighting module of claim 4, wherein the connection channels of the multiplexer at least include a maximum gray scale display channel, a minimum gray scale display channel, a predetermined gray scale display channel and a three primary color display channel.
7. The lighting module of claim 1 wherein the luminance signal acquisition unit includes a luminance signal transmitting subunit and a luminance signal receiving subunit;
the input end of the brightness signal transmitting subunit is connected with the lighting source, the output end of the brightness signal transmitting subunit is connected with the input end of the brightness signal receiving subunit, the output end of the brightness signal receiving subunit is connected with the input end of the preprocessing unit, and the output end of the preprocessing unit is connected with the input end of the brightness compensation unit.
8. The lighting module of claim 1 wherein the pre-processing unit includes an optical sensor.
9. The lighting module of claim 1, further comprising a light guide plate and a diffusion sheet, wherein the light guide plate is located on a light exit side of the lighting sources, and the diffusion sheet is located on a side of the light guide plate away from the lighting sources.
10. A light box fixture, comprising a box body and the lighting module set of any one of claims 1-9, wherein the lighting module set is disposed in the box body.
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| CN202223593013.3U CN218848505U (en) | 2022-12-29 | 2022-12-29 | Lighting module and light box jig |
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