CN115497424A - Backlight brightness compensation system and compensation method thereof - Google Patents
Backlight brightness compensation system and compensation method thereof Download PDFInfo
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- CN115497424A CN115497424A CN202211142029.4A CN202211142029A CN115497424A CN 115497424 A CN115497424 A CN 115497424A CN 202211142029 A CN202211142029 A CN 202211142029A CN 115497424 A CN115497424 A CN 115497424A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0613—The adjustment depending on the type of the information to be displayed
- G09G2320/062—Adjustment of illumination source parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The application discloses a brightness compensation system of a backlight source and a compensation method thereof, wherein the brightness compensation system of the backlight source further comprises: the backlight driving module comprises a control chip, a compensation driving chip, a brightness compensation calculating unit, a plurality of switch units and a plurality of compensation wires, wherein the compensation driving chip comprises a plurality of compensation channels, each compensation channel is connected to the plurality of compensation wires through one switch unit, each compensation wire is connected to one lamp string, and when the detected brightness of the lamp strings is detected to be not in accordance with the preset requirement, the control chip controls the switch units to conduct the compensation wires of the corresponding lamp strings; the brightness compensation calculating unit calculates and outputs compensation data according to the detected brightness and the standard brightness; and the compensation driving chip receives and performs brightness compensation on the lamp string through the compensation channel and the compensation route according to the compensation data. The problem that the uniformity difference exists in the backlight brightness caused by the circuit wiring loss is solved.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a brightness compensation system of a backlight and a compensation method thereof.
Background
With the continuous improvement of living standard, people have higher requirements on display equipment, and the emergence of MINI LED makes the backlight source adopting MINI LED become possible.
In the existing MINI LED backlight source, thousands of MINI LEDs are used as the backlight source, more routing lines are required to be connected due to the fact that the number of lamp beads is too large, routing loss of internal circuit routing lines inevitably exists, different partition voltages are different due to the routing loss, voltage is inaccurate for certain LED lamps due to the process difference of LED voltages produced by different manufacturers in different batches and other reasons, the light emitting of the LED lamps is related to the power of the LED lamps, the inaccurate voltage can cause the LED lamps to be incapable of obtaining the brightness which is required to be achieved, the brightness uniformity of the whole MINI LED backlight is affected, and the display quality of the whole display device is affected.
Therefore, how to improve the non-uniform brightness of the backlight source caused by the circuit trace loss becomes a problem to be solved in the field.
Disclosure of Invention
The application aims to provide a brightness compensation system of a backlight source and a compensation method thereof, which can effectively solve the problem that the brightness of the backlight source has uniformity difference due to circuit wiring loss.
The application discloses a brightness compensation system of a backlight source, which comprises a lamp panel, wherein the lamp panel is provided with a plurality of lamp strings, each lamp string is provided with a plurality of lamp beads in series, and different lamp strings are not communicated with each other; characterized in that, the brightness compensation system of the backlight source further comprises: the backlight driving module comprises a plurality of driving chips, each driving chip comprises a plurality of control channels, and each control channel is correspondingly connected with and controls one lamp string; the compensation module comprises a control chip, a compensation driving chip, a brightness compensation calculation unit, a plurality of switch units and a plurality of compensation wires, wherein the brightness compensation calculation unit is respectively connected with the control chip and the compensation driving chip, and the control chip is connected with and controls the switch units; the compensation driving chip comprises a plurality of compensation channels, each compensation channel is connected with a plurality of compensation wires through one switch unit, each compensation wire is connected with one lamp string, and the switch unit is used for controlling the connection or disconnection of the compensation channels and the plurality of lamp strings; when the detected brightness of the lamp string does not meet the preset requirement, the control chip controls the switch unit to conduct the compensation wiring corresponding to the lamp string; the brightness compensation calculating unit calculates and outputs compensation data according to the detected brightness and the standard brightness; and the compensation driving chip receives and performs brightness compensation on the lamp string through the compensation channel and the compensation wiring according to the compensation data.
Optionally, the brightness compensation calculating unit includes a storage unit, a compensation lookup table is stored in the storage unit, and the brightness compensation calculating unit generates compensation data according to the compensation lookup table.
Optionally, the brightness compensation system further includes a brightness detection module, the brightness detection module is connected to the brightness compensation calculation unit, and the brightness detection module includes a plurality of brightness detection units, which respectively correspond to the light strings arranged on the lamp panel, and are used for detecting the detection brightness of the light strings.
Optionally, the brightness compensation system of the backlight source further includes a plurality of partition plates made of a light-shielding material, and each partition plate is respectively disposed between two adjacent light strings.
The application also discloses a brightness compensation method of the backlight source, which is applied to the brightness compensation system of the backlight source, and the brightness compensation method of the backlight source comprises the following steps: a detection step: detecting the detection brightness of all the lamp strings and comparing the detected brightness with the target brightness; and a compensation step: if the detected brightness of the light string does not meet the preset requirement, the compensation wiring corresponding to the light string is conducted; and meanwhile, calculating and outputting compensation data according to the detected brightness and the standard brightness, and performing brightness compensation on the brightness of the lamp string according to the compensation data.
Optionally, the compensating step includes: if the actual brightness of the lamp strings does not meet the preset requirement, detecting whether two or more lamp strings with brightness problems exist in the lamp strings of the same compensation channel; if yes, simultaneously opening compensation wires corresponding to the plurality of lamp strings with brightness problems; outputting compensation data according to the detected brightness and standard brightness of a plurality of lamp strings, averaging the compensation data to output average compensation data, and performing brightness compensation on the lamp strings with brightness problems according to the average compensation data; if not, only conducting the compensation wiring corresponding to the light string; and meanwhile, outputting compensation data according to the detected brightness and the standard brightness of the lamp string, and performing brightness compensation on the lamp string with the brightness problem according to the average compensation data.
Optionally, the compensating step includes: when two or more than two lamp strings connected to the same compensation channel are detected to have brightness problems, judging the difference values of the plurality of lamp strings with the brightness problems, if the difference values are smaller than a threshold value, taking the lamp string with the most serious brightness problem as a main problem lamp string, and calculating main problem compensation data according to the detected brightness and standard brightness of the main problem lamp string; the switch unit simultaneously turns on the compensation wires corresponding to the plurality of light strings with brightness problems, and the compensation driving chip performs brightness compensation on the plurality of light strings with brightness problems according to the main problem compensation data.
Optionally, the compensating step includes: when two or more than two of the lamp strings connected to the same compensation channel are detected to have brightness problems, detecting the overall brightness of the plurality of lamp strings, and if the overall brightness meets the preset requirement, not compensating the plurality of lamp strings with brightness problems; and the lamp strings connected to the same compensation channel are arranged adjacently.
Optionally, the compensating step includes: when two or more than two of the lamp strings connected to the same compensation channel are detected to have brightness problems; judging whether the problems of high brightness and low brightness exist at the same time, if so, detecting the overall brightness of the plurality of lamp strings, and if the overall brightness meets the preset requirement, not compensating the plurality of lamp strings with brightness problems; if the difference value is smaller than the threshold value, the light string with the most serious brightness problem is taken as the main problem light string, and main problem compensation data are calculated according to the detected brightness and the standard brightness of the main problem light string; the switch unit simultaneously turns on compensation wires corresponding to the plurality of lamp strings with brightness problems, and the compensation driving chip performs brightness compensation on the plurality of lamp strings with brightness problems according to the main problem compensation data; if the difference value is larger than or equal to the threshold value, outputting compensation data according to the detected brightness and the standard brightness of the plurality of lamp strings respectively, and averaging the plurality of compensation data to output average compensation data; the switch unit simultaneously turns on compensation wires corresponding to the plurality of lamp strings with brightness problems, and the compensation driving chip performs brightness compensation on the plurality of lamp strings with brightness problems according to the average compensation data; and the plurality of lamp strings connected to the same compensation channel are adjacently arranged.
Optionally, the method for compensating the brightness of the backlight source further comprises a step of generating a compensation lookup table, wherein the step of generating the compensation lookup table comprises the steps of collecting the string lights as a unit, and detecting the detection brightness corresponding to each string light under all gray scales; after the collection is finished, the detected brightness of all the lamp strings under all the gray scales is respectively compared with the target brightness value, and the compensation lookup table is generated.
The compensation module is connected with the plurality of lamp strings in the backlight source to realize brightness compensation on the lamp strings with brightness difference, and the targeted compensation control on the target lamp strings is performed to improve the display uniformity, and particularly, the compensation module is characterized in that a plurality of compensation channels of the compensation module are respectively connected with the switch unit, and the switch unit is used for independently controlling the connection and disconnection between each compensation channel and the plurality of lamp strings, so that one compensation channel can meet the possible compensation requirements of the plurality of lamp strings, and the use of a compensation driving chip can be obviously reduced; the compensation chip can be additionally arranged instead of compensating the original driving chip, so that the situation that the compensation is carried out on the original chip but the output range of the original chip cannot meet the compensation requirement is avoided, and too much extra space is not occupied; the problem that the uniformity difference exists in the backlight brightness caused by the circuit wiring loss is effectively solved, and the display quality of the display equipment is further improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a block diagram of a first embodiment of a brightness compensation system for a backlight of the present application;
fig. 2 is a schematic view of a lamp panel in a first embodiment of a brightness compensation system of a backlight source of the present application;
FIG. 3 is a block diagram of a compensation module in a first embodiment of a brightness compensation system of a backlight according to the present application;
fig. 4 is a block diagram of a luminance compensation calculating unit in a luminance compensation system of a backlight according to the present application;
FIG. 5 is a flowchart illustrating the generation of a compensation lookup table in a first embodiment of a brightness compensation system of a backlight according to the present application;
FIG. 6 is a block diagram of a second embodiment of a brightness compensation system for a backlight according to the present application;
fig. 7 is a schematic partial view of a lamp panel in a third embodiment of a brightness compensation system of a backlight according to the present application;
FIG. 8 is a flowchart illustrating an embodiment of a method for compensating brightness of a backlight according to the present disclosure;
FIG. 9 is a flowchart illustrating a compensation step of a first embodiment of a method for compensating brightness of a backlight according to the present application;
FIG. 10 is a flowchart illustrating a compensation step of a second embodiment of a method for compensating brightness of a backlight according to the present application;
FIG. 11 is a flowchart illustrating a compensation step of a third embodiment of a brightness compensation method for a backlight according to the present application;
fig. 12 is a flowchart of a compensation step in a fourth embodiment of a brightness compensation method of a backlight source of the present application.
10, a brightness compensation system of the backlight source; 100. a lamp panel; 200. a string of lights; 210. a lamp bead; 300. a backlight driving module; 310. a driver chip; 320. a control channel; 400. a compensation module; 410. a control chip; 420. a compensation driving chip; 421. a compensation channel; 422. a switch unit; 440. a luminance compensation calculating unit; 441. a storage unit; 442. a compensation look-up table; 450. compensating routing; 500. a brightness detection module; 510. a brightness detection unit; 600. a separator.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The present application is described in detail below with reference to the figures and alternative embodiments.
FIG. 1 is a block diagram of a first embodiment of a brightness compensation system for a backlight of the present application; fig. 2 is a schematic view of a lamp panel in a first embodiment of a brightness compensation system of a backlight source of the present application; FIG. 3 is a block diagram of a compensation module in a first embodiment of a brightness compensation system of a backlight according to the present application; as shown in fig. 1 to 3, the present application discloses a brightness compensation system 10 of a backlight source, which includes a lamp panel 100, wherein the lamp panel 100 is provided with a plurality of lamp strings 200, each lamp string 200 is provided with a plurality of lamp beads 210 in series, and different lamp strings 200 are not connected with each other; the brightness compensation system 10 of the backlight further comprises: the backlight driving module 300 comprises a plurality of driving chips 310, each driving chip 310 comprises a plurality of control channels 320, and each control channel 320 is respectively and correspondingly connected with and controls one lamp string 200; the compensation module 400 includes a control chip 410, a compensation driving chip 420, a brightness compensation calculating unit 440, a plurality of switch units 422 and a compensation wire 450, wherein the brightness compensation calculating unit 440 is respectively connected with the control chip 410 and the compensation driving chip 420, and the control chip 410 is connected with and controls the switch units 422; the compensation driving chip 420 includes a plurality of compensation channels 421, each compensation channel 421 is connected to a plurality of compensation wires 450 through a switch unit 422, each compensation wire 450 is connected to one light string 200, and the switch unit 422 is used for controlling the connection or disconnection between the compensation channel 421 and the plurality of light strings 200; when detecting that the detected brightness of the string lights 200 does not meet the preset requirement, the control chip 410 controls the switch unit 422 to turn on the compensation wire 450 of the corresponding string light 200; the luminance compensation calculating unit 440 calculates and outputs compensation data according to the detected luminance and the standard luminance; the compensation driving chip 420 receives and performs brightness compensation on the string of lights 200 through the compensation channel 421 and the compensation trace 450 according to the compensation data.
It should be noted that the backlight driving module 300 and the compensation module 400 in fig. 1 are outside the lamp panel 100, but in fact, some of the backlight driving module 300 and the compensation module 400 may be completely disposed on the lamp panel 100 even if conditions allow.
The present application not only realizes brightness compensation for the strings 200 with brightness difference by connecting the compensation module 400 with the multiple strings 200 in the backlight source, and performs targeted compensation control on the target string 200 to improve the display uniformity, but also is particularly important in that the multiple compensation channels 421 of the compensation module 400 in the present application are respectively connected with the switch unit 422, and the switch unit 422 individually controls the connection and disconnection between each compensation channel 421 and the multiple strings 200, so that one compensation channel 421 can meet the possible compensation requirements of the multiple strings 200, and the use of the compensation driving chip 420 can be significantly reduced; the compensation chip can be additionally arranged instead of compensating the original driving chip 310, so that the situation that the compensation requirement cannot be met in the output range of the original chip and too much extra space cannot be occupied is avoided; the problem that the uniformity difference exists in the backlight brightness caused by the circuit wiring loss is effectively solved, and the display quality of the display equipment is further improved. The compensation data in this application can be that compensation driver chip 420 directly obtains the compensation data from luminance compensation calculating unit 440, of course, also can compensate driver chip 420 and be connected with control chip 410, is indirectly obtained through control chip 410, and control chip 410 overall control, better assurance synchronism.
Fig. 4 is a block diagram of a structure of a luminance compensation calculating unit in the luminance compensation system of the backlight according to the present application, as shown in fig. 4, the luminance compensation calculating unit 440 includes a storage unit 441, a compensation lookup table 442 is stored in the storage unit 441, and the luminance compensation calculating unit 440 generates compensation data according to the compensation lookup table 442.
The lamp string 200 with the brightness not meeting the preset requirement is set as the problem lamp string 200, the brightness value of the problem lamp string 200 is detected, the detected brightness value is stored in the storage unit 441, the compensation lookup table 442 in the storage unit 441 generates compensation data according to the detected brightness value, so that the compensation driving chip 420 can more quickly, more conveniently and more accurately obtain the compensation data, and according to the obtained compensation data, the brightness compensation is performed on the problem lamp string 200 with the brightness difference through the compensation channel 421 and the compensation wiring 450, so that the problem lamp string 200 can reach or approach the preset requirement, the whole brightness uniformity of the backlight source tends to be consistent, the problem that the backlight source brightness has the uniformity difference due to the circuit wiring loss is effectively solved, and the display quality of the display device is further improved.
In order to make the compensation data formed in the compensation look-up table 442 more accurate, the present application further provides a method for generating the compensation look-up table 442, which includes the following steps:
fig. 5 is a flowchart of generating a compensation lookup table in the first embodiment of the brightness compensation system of the backlight source of the present application, and as shown in fig. 5, the brightness compensation method of the backlight source further includes a step S3 of generating the compensation lookup table, where the step S3 of generating the compensation lookup table includes:
s31: collecting the strings 200 as a unit, and detecting the corresponding detection brightness of each string 200 under all gray scales;
s32: after the collection, the detected brightness of all the strings 200 under all the gray scales is compared with the target brightness value, and a compensation lookup table 442 is generated.
Firstly, a precise optical photographing instrument can be prepared in advance, the precision of the instrument can be used for photographing the display brightness of a block corresponding to each lamp string 200, so that precise image acquisition work is carried out, the acquisition work is carried out by taking one lamp string 200 as a unit, the acquisition work is carried out for multiple times until the brightness values of all the lamp strings 200 are acquired and then stored in a computer, and then the brightness values are compared with target brightness values in the computer to form a compensation lookup table; the compensation lookup table may be common, or of course, the compensation lookup table may be formed by grouping channels corresponding to one driver chip 310, so that the formed lookup table is adjusted more accurately.
An exemplary illustration is as follows: taking the gray scales from 0 to 255 as target images P1 to P255 and the brightness values from G0 to G255, collecting the brightness value of each light string 200 of each driving chip 310, filling in the brightness value, if the test gray scale at the moment is G255, sequentially obtaining a table of gray scale values from Y1 of the first light string 200 of the first driving chip 310 of the image to the last light string 200Y18 of the last driving chip 310, performing difference calculation on the table value at the moment and the table value of the standard target to obtain a difference table (x 1 to x 18), filling in the table to obtain tables of all light strings 200 with the gray scales from 0 to 255, and judging whether to implement the adjustment measures according to different rule solving measures of the values in the tables, wherein the judgment can be made by calculating the standard deviation S in the tables to measure the degree of the data values deviating from the arithmetic mean value, and the smaller the standard deviation is the mean value, and vice versa. The formula for the standard deviation is as follows:
where N is the number of strings 200, i.e., N x m, xi is the detected brightness of a string,
is the average of the detected brightness of all strings 200.
Based on the above formula, first, a plurality of output channels corresponding to one driving chip 310 are compared, and since the same group of driving voltages are shared, if S of the driving chip 310 is greater than a certain set value at a certain gray level, which indicates that different channels of the same driving chip 310 have uneven brightness, the current of the channels is adjusted, so that the finally calculated standard deviation is within a set range, and thus, the brightness of the area corresponding to the driving chip 310 is uniform.
Then, the standard deviation between different driving chips 310 is compared, if the standard deviation exceeds a set value, the compensation data of the compensation driving chip 420 is adjusted, so that the brightness of corresponding areas between the driving chips 310 with different brightness tends to be the same, the adjustment is started from 0 gray, and after one gray scale is adjusted, appropriate voltage and current values corresponding to different gray scales in different areas of the whole backlight can be obtained.
The scheme of the present application may be that a CCD (high precision camera) is used to detect the brightness in advance to control the compensation driving chip 420 to compensate; of course, the brightness detection module 500 may also be disposed in the display panel to realize real-time brightness detection and brightness compensation during the use process, so as to better improve the situation that the compensation data of the factory setting cannot compensate the brightness difference due to line aging and other reasons after the display panel is used for a period of time.
If the light string 200 that has been adjusted once still cannot be adjusted to the required brightness after compensation, the brightness detection module 500 can detect the adjustment again, and the compensation can be continuously increased until the brightness meets the requirement; in addition, when the compensation lookup table 442 is formed, brightness detection and compensation may be performed on a batch of display panels to form a first compensation lookup table; then, carrying out an aging test, and carrying out brightness detection and compensation again on the display panels of the same batch after the aging test to form a second compensation lookup table; in the actual use process, the first compensation lookup table is used in the previous period, and the display panel is switched to the second compensation lookup table after being used for a preset time, so that a more accurate compensation effect is achieved.
In addition to the above improvements, the present application makes the following improvements:
fig. 6 is a block diagram of a second embodiment of the brightness compensation system of the backlight source of the present application, where the embodiment shown in fig. 6 is based on the improvement of fig. 1, and as shown in fig. 6, the brightness compensation system 10 of the backlight source further includes a brightness detection module 500, the brightness detection module 500 is connected to a brightness compensation calculation unit 440, and the brightness detection module 500 includes a plurality of brightness detection units 510, which are respectively disposed on the lamp panel 100 corresponding to the lamp strings 200 and are used for detecting the detected brightness of the lamp strings 200.
In this embodiment, the brightness detection unit 510 may be a brightness sensor, or may be a photosensitive sensor or other devices that mainly collect light signals, and this application is not particularly limited, and only the brightness detection unit 510 is taken as the brightness sensor for illustration.
In this embodiment, a brightness sensor is additionally disposed corresponding to each light string 200, and the brightness of each light string 200 is detected by each brightness sensor, so that the detection error caused by the regional detection brightness can be reduced by the targeted detection of the brightness, and real-time detection can also be achieved, once a defective light string 200 is found, the brightness signal is transmitted by the brightness sensor and transmitted to the brightness compensation calculating unit 440, and the compensation data is calculated by the brightness compensation calculating unit 440, so that the compensation driving chip 420 can obtain more accurate compensation data, and according to the obtained compensation data, the brightness compensation is performed on the defective light string 200 having the brightness difference by the compensation channel 421 and the compensation wiring 450, so that the defective light string 200 can reach or approach the preset requirement, the overall brightness uniformity of the backlight tends to be consistent, the problem of the uniformity difference of the backlight brightness caused by the circuit wiring loss is effectively improved, and the display quality of the display device is further improved.
Further, in order to avoid crosstalk caused by light rays emitted from a plurality of light strings 200, and to prevent errors in brightness detection between the light strings 200 and the light strings 200, the present application also provides improvements to the plurality of light strings 200:
fig. 7 is a partial schematic view of a lamp panel in a third embodiment of a brightness compensation system of a backlight according to the present application, and the embodiment shown in fig. 7 is based on the improvement of fig. 2, as shown in fig. 7, the brightness compensation system 10 of the backlight further includes a plurality of spacers 600, the spacers 600 are made of a light-shielding material, and each spacer 600 is respectively disposed between two adjacent strings 200.
In this embodiment, the partition 600 made of the light-shielding material is disposed between two adjacent light strings 200 to separate light between the two adjacent light strings 200, so as to effectively improve the condition that the brightness of each light string 200 is not accurate due to crosstalk between the two adjacent light strings 200; further promote the accuracy of detecting the luminance value of the problem light string 200, thus can generate more accurate compensation data, the compensation driver chip 420 can obtain more accurate compensation data, and according to the obtained compensation data, carry out luminance compensation to the problem light string 200 with luminance difference through the compensation channel 421 and the compensation wiring 450, make the problem light string 200 reach or approach the preset requirement, realize that the whole luminance uniformity of the backlight tends to be consistent, effectively improve the problem that the backlight luminance has uniformity difference due to circuit wiring loss, further promote the display quality of the display device.
Fig. 8 is a flowchart of an embodiment of a luminance compensation method of a backlight according to the present application, which further discloses a luminance compensation method of a backlight, applied to the luminance compensation system 10 of a backlight, where the luminance compensation method of a backlight includes:
s1, a detection step: detecting the detected brightness of all the lamp strings 200, and comparing the detected brightness with the target brightness; and
s2: a compensation step: if the detected brightness of the light string 200 does not meet the preset requirement, the compensation wire 450 of the corresponding light string 200 is conducted; meanwhile, the compensation data is calculated and output according to the detected brightness and the standard brightness, and the brightness compensation is carried out on the brightness of the lamp string 200 according to the compensation data.
This may enable targeted compensation control of the target string 200; the problem that the uniformity of the brightness of the backlight source caused by the circuit wiring loss is different is effectively solved, and the display quality of the display equipment is further improved.
Fig. 9 is a flowchart of a compensation step in a first embodiment of a luminance compensation method of a backlight source of the present application, and as shown in fig. 9, the compensation step S2 includes:
s21: if the actual brightness of the light string 200 does not meet the preset requirement, detecting whether two or more light strings 200 with brightness problems exist in the light string 200 in the same compensation channel 421;
s22: if yes, the compensation wires 450 corresponding to the multiple light strings 200 with brightness problems are opened simultaneously; meanwhile, compensation data are output according to the detected brightness and the standard brightness of the plurality of lamp strings 200, the plurality of compensation data are averaged to output average compensation data, and the brightness compensation is carried out on the plurality of lamp strings 200 with the brightness problem according to the average compensation data;
s23: if not, only the compensation wire 450 of the corresponding lamp string 200 is conducted; meanwhile, compensation data is output according to the detected brightness and the standard brightness of the lamp string 200, and the brightness compensation is carried out on the lamp string 200 with the brightness problem according to the average compensation data.
In this embodiment, compensation data is formed according to the brightness difference between the detected brightness and the standard brightness of the plurality of light strings 200, and the average data of the plurality of compensation data is taken to perform brightness compensation on each light string 200, so that the overall brightness of the plurality of light strings 200 tends to meet a predetermined standard, thereby achieving the purpose of improving the brightness uniformity of the whole backlight source.
Fig. 10 is a flowchart of a compensation step in a second embodiment of the brightness compensation method of the backlight source of the present application, where the compensation step S2 includes:
s221: when two or more strings 200 connected to the same compensation channel 421 are detected to have brightness problems, the difference value of the strings 200 with brightness problems is determined;
s222, if the difference value is smaller than the threshold value, the lamp string 200 with the most serious brightness problem is taken as the lamp string 200 with the main problem, and the compensation data of the main problem is calculated according to the detected brightness and the standard brightness of the lamp string 200 with the main problem;
s223, the switch unit 422 simultaneously turns on the compensation trace 450 corresponding to the plurality of strings 200 with brightness problem, and the compensation driving chip 420 performs brightness compensation on the plurality of strings 200 with brightness problem according to the compensation data with main problem.
Different from the previous embodiment, when actually detecting the brightness values of the multiple light strings 200, if two or more problem light strings 200 exist, the difference value between the actual brightness value and the standard brightness value is set as the difference value among the multiple problem light strings 200, if the difference value is smaller than the preset threshold value, the light string 200 with the most serious brightness problem is set as the main problem light string 200, brightness compensation is performed only for the main problem light string 200, and the brightness of the main problem light string 200 mainly affecting the local brightness problem of the backlight source is improved to enable other light strings 200 with small brightness difference, when the main problem light string 200 is compensated and light is emitted together along with the main problem light string 200, the whole brightness uniformity of the backlight source can be integrally reached or close to the standard brightness, the problem that the uniformity difference exists in the backlight source brightness due to circuit wiring loss is effectively solved, and the display quality of the display device is further improved.
Fig. 11 is a flowchart of a compensation step in a third embodiment of the brightness compensation method of the backlight source of the present application, where the compensation step S2 includes:
s231: when two or more strings 200 connected to the same compensation channel 421 are detected to have brightness problems, detecting the overall brightness of a plurality of strings 200;
s232, if the overall brightness meets the preset requirement, the plurality of lamp strings 200 with brightness problems are not compensated;
wherein, the strings 200 connected to the same compensation channel 421 are adjacently arranged.
The difference between this embodiment and the previous embodiment is that the present embodiment performs an overall judgment on the regional brightness formed by a plurality of strings 200, for example: there are 6 light strings 200 connected to the same compensation channel 421, wherein one or two light strings 200 have brightness difference problem, but the brightness of other light strings 200 is displayed normally, and the brightness difference value of the problematic light strings 200 is not large, at this time, when the adjacent 6 light strings 200 emit light together, the brightness difference in the whole area formed by them may not be obvious, so it is not necessary to perform compensation adjustment, and it is also not necessary to perform brightness compensation on the light strings 200 having brightness problem, so that the whole power consumption of the backlight source can be effectively reduced.
In order to deal with different compensation problems of multiple light strings 200 in different states, the present application makes corresponding compensation method improvements for the actual possible situations of the light strings 200, specifically as follows:
fig. 12 is a flowchart of a compensation step in a fourth embodiment of the brightness compensation method of the backlight source of the present application, where the compensation step S2 further includes:
s241: when two or more of the strings 200 connected to the same compensation channel 421 are detected to have brightness problems, determining whether the brightness problems exist at the same time;
s242: if the brightness of the light strings 200 meets the preset requirement, the light strings 200 with the brightness problem are not compensated; if not, judging the difference values of the plurality of lamp strings 200 with the brightness problem;
s243, if the difference value is less than the threshold value, the lamp string 200 with the most serious brightness problem is taken as the main problem lamp string 200, and the main problem compensation data is calculated according to the detected brightness and the standard brightness of the main problem lamp string 200; the switch unit 422 simultaneously turns on the compensation wires 450 corresponding to the plurality of strings 200 with brightness problems, and the compensation driving chip 420 performs brightness compensation on the plurality of strings 200 with brightness problems according to the compensation data of the main problems;
s244, if the difference value is larger than or equal to the threshold value, respectively outputting compensation data according to the detected brightness and the standard brightness of the plurality of lamp strings 200, averaging the plurality of compensation data and outputting average compensation data; the switch unit 422 simultaneously turns on the compensation wires 450 corresponding to the plurality of light strings 200 with brightness problems, and the compensation driving chip 420 performs brightness compensation on the plurality of light strings 200 with brightness problems according to the average compensation data;
wherein strings 200 connected to the same compensation channel 421 are arranged adjacently.
The embodiment is directed to a plurality of lamp strings 200 which are adjacently arranged, when two or more problem lamp strings 200 exist, if the problem lamp strings 200 have a condition of high brightness or low brightness, the overall brightness of the plurality of lamp strings 200 is detected, if the overall brightness meets the preset requirement, the lamp strings 200 with the brightness problem are not compensated, the power consumption can be effectively reduced, if the problem lamp strings 200 do not have the problem of high brightness or low brightness, the difference values of the plurality of problem lamp strings 200 are judged, if the difference values are smaller than the preset threshold value, the lamp strings 200 with the most serious brightness problem are set as the main problem lamp strings 200, the brightness compensation is only performed on the main problem lamp strings 200, the brightness of the main problem lamp strings 200 which mainly affect the local brightness problem of the backlight source is improved, so that other lamp strings 200 with small brightness difference can be achieved or close to the standard brightness integrally when the main problem lamp strings 200 jointly emit light after the main problem lamp strings 200 are compensated, the uniformity of the overall brightness of the backlight source tends to be consistent, the problem of the brightness caused by circuit wiring loss is effectively improved, and the display quality of the display device is further improved.
If the difference value of the lamp string 200 in question is greater than or equal to the threshold value, compensation data is formed according to the brightness difference value between the detected brightness and the standard brightness of the plurality of lamp strings 200, and the average data of the plurality of compensation data is taken to perform brightness compensation on each lamp string 200, so that the overall brightness of the plurality of lamp strings 200 tends to meet the predetermined standard, and the purpose of improving the brightness uniformity of the whole backlight source is achieved.
It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.
The foregoing is a further detailed description of the present application in connection with specific alternative embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A brightness compensation system of a backlight source comprises a lamp panel, wherein a plurality of lamp strings are arranged on the lamp panel, a plurality of lamp beads are arranged in series in each lamp string, and different lamp strings are not communicated; characterized in that, the brightness compensation system of the backlight source further comprises:
the backlight driving module comprises a plurality of driving chips, each driving chip comprises a plurality of control channels, and each control channel is correspondingly connected with and controls one lamp string;
the compensation module comprises a control chip, a compensation driving chip, a brightness compensation calculation unit, a plurality of switch units and a plurality of compensation wires, wherein the brightness compensation calculation unit is respectively connected with the control chip and the compensation driving chip, and the control chip is connected with and controls the switch units;
the compensation driving chip comprises a plurality of compensation channels, each compensation channel is connected with a plurality of compensation wires through one switch unit, each compensation wire is connected with one lamp string, and the switch unit is used for controlling the connection or disconnection of the compensation channels and the plurality of lamp strings;
when the detected brightness of the lamp string does not meet the preset requirement, the control chip controls the switch unit to conduct the compensation wiring corresponding to the lamp string; the brightness compensation calculating unit calculates and outputs compensation data according to the detected brightness and the standard brightness; and the compensation driving chip receives the compensation data and carries out brightness compensation on the lamp string through the compensation channel and the compensation wiring according to the compensation data.
2. The system of claim 1, wherein the luminance compensation calculating unit comprises a storage unit, a compensation look-up table is stored in the storage unit, and the luminance compensation calculating unit generates the compensation data according to the compensation look-up table.
3. The system of claim 1, further comprising a brightness detection module, wherein the brightness detection module is connected to the brightness compensation calculation unit, and the brightness detection module comprises a plurality of brightness detection units, and the brightness detection units are respectively disposed on the lamp panel corresponding to the string of lights and configured to detect the detected brightness of the string of lights.
4. The brightness compensation system of claim 3, further comprising a plurality of partitions made of light-shielding material, wherein each partition is disposed between two adjacent strings of lights.
5. A method for compensating the brightness of a backlight source, which is applied to the brightness compensation system of the backlight source as claimed in any one of claims 1 to 4, characterized in that: the brightness compensation method of the backlight source comprises the following steps:
a detection step: detecting the detected brightness of all the lamp strings, and comparing the detected brightness with the target brightness; and
a compensation step: if the detected brightness of the light string does not meet the preset requirement, the compensation wiring corresponding to the light string is conducted; and meanwhile, calculating and outputting compensation data according to the detected brightness and the standard brightness, and performing brightness compensation on the brightness of the lamp string according to the compensation data.
6. The method for compensating the brightness of the backlight according to claim 5, wherein the compensating step comprises:
if the actual brightness of the lamp strings does not meet the preset requirement, detecting whether two or more lamp strings with brightness problems exist in the lamp strings of the same compensation channel;
if yes, simultaneously opening compensation wires corresponding to the plurality of lamp strings with brightness problems; outputting compensation data according to the detected brightness and standard brightness of a plurality of lamp strings, averaging the compensation data to output average compensation data, and performing brightness compensation on the lamp strings with brightness problems according to the average compensation data;
if not, only conducting the compensation wiring corresponding to the lamp string; and meanwhile, outputting compensation data according to the detected brightness and the standard brightness of the light string, and performing brightness compensation on the light string with the brightness problem according to the average compensation data.
7. The method of compensating for the brightness of a backlight according to claim 5, wherein the compensating step comprises:
when two or more than two of the lamp strings connected to the same compensation channel are detected to have brightness problems, judging difference values of the lamp strings with the brightness problems, if the difference values are smaller than a threshold value, taking the lamp string with the most serious brightness problem as a main problem lamp string, and calculating main problem compensation data according to the detected brightness and standard brightness of the main problem lamp string;
the switch unit simultaneously turns on the compensation wires corresponding to the plurality of light strings with brightness problems, and the compensation driving chip performs brightness compensation on the plurality of light strings with brightness problems according to the main problem compensation data.
8. The method for compensating the brightness of the backlight according to claim 5, wherein the compensating step comprises:
when two or more than two of the lamp strings connected to the same compensation channel are detected to have brightness problems, detecting the overall brightness of the plurality of lamp strings, and if the overall brightness meets the preset requirement, not compensating the plurality of lamp strings with brightness problems;
and the lamp strings connected to the same compensation channel are arranged adjacently.
9. The method for compensating the brightness of the backlight according to claim 5, wherein the compensating step comprises:
when two or more than two of the lamp strings connected to the same compensation channel are detected to have brightness problems, judging whether the problems of high brightness and low brightness exist at the same time;
if the brightness of the light strings is not the preset brightness, judging the difference value of the light strings with the brightness problem;
if the difference value is smaller than the threshold value, the lamp string with the most serious brightness problem is taken as the main problem lamp string, and main problem compensation data are calculated according to the detected brightness and the standard brightness of the main problem lamp string; the switch unit simultaneously turns on compensation wires corresponding to the plurality of lamp strings with brightness problems, and the compensation driving chip performs brightness compensation on the plurality of lamp strings with brightness problems according to the main problem compensation data;
if the difference value is larger than or equal to the threshold value, outputting compensation data according to the detected brightness and the standard brightness of the plurality of lamp strings respectively, and averaging the plurality of compensation data to output average compensation data; the switch unit simultaneously turns on compensation wires corresponding to the plurality of lamp strings with brightness problems, and the compensation driving chip performs brightness compensation on the plurality of lamp strings with brightness problems according to the average compensation data;
and a plurality of light strings connected to the same compensation channel are adjacently arranged.
10. The method for compensating the brightness of the backlight source according to claim 5, wherein the method for compensating the brightness of the backlight source further comprises a step of generating a compensation lookup table, wherein the step of generating the compensation lookup table comprises the steps of collecting the string lights as a unit, and detecting the detected brightness corresponding to each string light under all gray scales;
after the collection is finished, the detected brightness of all the lamp strings under all the gray scales is respectively compared with the target brightness value, and the compensation lookup table is generated.
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