WO2023028895A1 - 背光控制方法及背光控制电路 - Google Patents

背光控制方法及背光控制电路 Download PDF

Info

Publication number
WO2023028895A1
WO2023028895A1 PCT/CN2021/115842 CN2021115842W WO2023028895A1 WO 2023028895 A1 WO2023028895 A1 WO 2023028895A1 CN 2021115842 W CN2021115842 W CN 2021115842W WO 2023028895 A1 WO2023028895 A1 WO 2023028895A1
Authority
WO
WIPO (PCT)
Prior art keywords
backlight
block
uniformity
blocks
group
Prior art date
Application number
PCT/CN2021/115842
Other languages
English (en)
French (fr)
Inventor
王丽斐
谢侑霖
方圣凯
高佩龄
Original Assignee
瑞仪(广州)光电子器件有限公司
瑞仪光电股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 瑞仪(广州)光电子器件有限公司, 瑞仪光电股份有限公司 filed Critical 瑞仪(广州)光电子器件有限公司
Priority to CN202180007975.5A priority Critical patent/CN116235240A/zh
Priority to PCT/CN2021/115842 priority patent/WO2023028895A1/zh
Priority to TW110143276A priority patent/TWI818359B/zh
Priority to US17/897,243 priority patent/US11769461B2/en
Priority to TW111132599A priority patent/TWI822281B/zh
Priority to PCT/CN2022/115661 priority patent/WO2023030283A1/zh
Priority to EP22863418.4A priority patent/EP4379704A1/en
Priority to CN202280018146.1A priority patent/CN117083662A/zh
Publication of WO2023028895A1 publication Critical patent/WO2023028895A1/zh
Priority to US18/402,645 priority patent/US20240144890A1/en

Links

Images

Classifications

    • 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
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the invention relates to a backlight control method and a backlight control circuit, in particular to a backlight control method and a backlight control circuit capable of improving display uniformity.
  • liquid crystal displays have become an indispensable part of users' lives, such as notebook computers, tablet computers, mobile phones, televisions and so on.
  • the configured display can play and display images for users to watch.
  • a backlight device is usually used to provide the backlight required by the display panel when displaying images.
  • light emitting diodes Light Emitting Diode, LED
  • LED Light Emitting Diode
  • the current backlight device often has the problem of uneven brightness and darkness, resulting in dark bands or dark lines at the corners of the appearance, and the uniformity cannot meet the required specifications. Furthermore, as the size of the display device becomes larger, the power consumption of the backlight device also becomes larger.
  • One of the current common solutions is to change the arrangement of the light sources, for example, to improve the uniformity by changing the spacing of the light source arrays.
  • Another way is to use light source binning (Bin) technology to adopt configurations of light sources of different levels.
  • the existing methods still have the disadvantages of high material cost and high man-hours for the light source components. Therefore, how to effectively solve the aforementioned problems has become an important issue in this technical field.
  • the object of the present invention is to provide a backlight control method and a backlight control circuit capable of improving display uniformity, so as to solve the above problems.
  • the present invention provides a backlight control method for a surface-emitting device.
  • the surface-emitting device includes a plurality of first groups and a plurality of second groups. Each group includes at least one backlight block along a first direction.
  • the arranged backlight blocks are defined as a first group, the backlight blocks arranged along a second direction are defined as a second group, and the first direction and the second direction are non-parallel
  • the backlight control method includes: generating A plurality of driving currents are used to drive the surface emitting device so that a plurality of backlight blocks generate a plurality of luminance values; a plurality of luminance values of a plurality of backlight blocks are measured; a plurality of backlight blocks are calculated according to a plurality of luminance values A plurality of uniformity and a plurality of target uniformity are set; a plurality of adjustment values are generated according to the plurality of uniformity, the plurality of target uniformity, and the plurality of adjustment coefficients corresponding to the pluralit
  • the present invention also provides a backlight control circuit for driving a surface-emitting device
  • the surface-emitting device includes a plurality of first groups and a plurality of second groups, each group includes at least one backlight block, along the first
  • the backlight blocks arranged in one direction are defined as a first group
  • the backlight blocks arranged in a second direction are defined as a second group
  • the first direction and the second direction are non-parallel
  • the backlight control circuit includes : a drive circuit, used to generate a plurality of driving currents to drive the surface emitting device, so that a plurality of backlight blocks generate a plurality of luminance values; a measurement circuit, used to measure a plurality of luminance values of a plurality of backlight blocks; and
  • the processing circuit is used to calculate the plurality of uniformity degrees of the plurality of backlight blocks according to the plurality of luminance values and set the plurality of target uniformity degrees, and to calculate the plurality of uniformity degrees according to the plurality of
  • FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a surface emitting device according to an embodiment of the present invention.
  • Fig. 3 is a schematic diagram of the process of the embodiment of the present invention.
  • FIG. 4 is a schematic diagram of uniformity of backlight blocks according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of target uniformity of backlight blocks according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of target luminance calculation according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a curve used for a curve fitting operation of a surface-emitting device with an aspect ratio according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of the adjusted driving current of the backlight block according to the embodiment of the present invention.
  • FIG. 9 is a schematic diagram of another process of the embodiment of the present invention.
  • Fig. 10 is a schematic diagram of another embodiment of the surface emitting device according to the embodiment of the present invention.
  • FIG. 11 is a schematic diagram of the corresponding relationship between the backlight block and the light emitting block according to the embodiment of the present invention.
  • Fig. 12 is a schematic diagram of another process of the embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a display device 1 according to an embodiment of the present invention.
  • the display device 1 includes a display panel 10 , a surface emitting device 20 and a backlight control circuit 30 .
  • the display panel 10 can be a liquid crystal display (Liquid Crystal Display, LCD) panel, but not limited thereto.
  • the display panel 10 is disposed above the surface emitting device 20 .
  • the surface emitting device 20 is used to provide the backlight required by the display panel 10 .
  • FIG. 2 which is a schematic diagram of an embodiment of a surface light emitting device 20 according to an embodiment of the present invention.
  • the surface emitting device 20 can be divided into a plurality of backlight blocks B. As shown in FIG.
  • the plurality of backlight blocks of the light emitting device 20 correspond to the display area of the display panel 10 to provide the backlight required by the display area of the display panel 10 .
  • the backlight blocks arranged along the direction D1 can be defined as a block row, or called a first group.
  • the backlight blocks arranged along the direction D2 (the second direction) can be defined as a block row, or called a second group.
  • the direction D1 and the direction D2 are non-parallel.
  • Each block column and block row includes at least one backlight block.
  • the surface emitting device 20 includes block columns BR1 -BRn and block rows BC1 -BCm.
  • Each block column includes m backlight blocks, and each block row includes n backlight blocks.
  • Each backlight block includes at least one light source for emitting light. The light emitted by the light source illuminates the display panel 10 when it is turned on.
  • the backlight control circuit 30 is coupled to the surface emitting device 20 for driving the surface emitting device 20 to provide a uniform backlight for the display panel 10 .
  • the backlight control circuit 30 includes a processing circuit 302 , a measuring circuit 304 and a driving circuit 306 .
  • the measuring circuit 304 is used for measuring the luminance value of the backlight block of the surface emitting device 20 .
  • the measurement circuit 304 includes an image sensor (not shown in the figure), and the image sensor may include a charge coupled device (Charge Coupled Device, CCD) image sensor or a complementary metal oxide semiconductor (CMOS) image sensor, but not limited thereto .
  • CCD Charge Coupled Device
  • CMOS complementary metal oxide semiconductor
  • the driving circuit 306 is used to generate a plurality of driving currents, a plurality of pre-driving currents or a plurality of adjusted driving currents to drive the surface emitting device 20 .
  • the driving circuit 306 can be a pulse width modulation (Pulse Width Modulation, PWM) circuit.
  • the processing circuit 302 is coupled to the measurement circuit 304 and the driver circuit 306 .
  • the processing circuit 302 is used to generate adjustment values corresponding to the plurality of backlight blocks, so that the driving circuit 306 generates a plurality of adjusted driving currents to drive the plurality of backlight blocks according to the adjustment values and the driving current.
  • the display device 1 further includes a display driving circuit (not shown in the figure) for controlling the image display operation of the display panel 10 .
  • FIG. 3 is a schematic diagram of the process 3 according to an embodiment of the present invention.
  • Process 3 includes the following steps:
  • Step S300 start.
  • Step S302 Generate a plurality of driving currents to drive the surface emitting device, so that a plurality of backlight blocks generate a plurality of luminance values.
  • Step S304 Measure a plurality of luminance values of a plurality of backlight blocks.
  • Step S306 Calculate a plurality of uniformity of the plurality of backlight blocks according to the plurality of luminance values and set a plurality of target uniformity.
  • Step S308 Generate a plurality of adjustment values according to the plurality of uniformity, the plurality of target uniformity, and the plurality of adjustment coefficients corresponding to the plurality of backlight blocks.
  • Step S310 Generate a plurality of adjusted driving currents to drive a plurality of backlight blocks according to the adjustment value and the plurality of driving currents.
  • Step S312 end.
  • step S302 the driving circuit 306 generates a plurality of driving currents to drive the surface emitting device 10, so that the plurality of backlight blocks of the surface emitting device 10 generate a plurality of luminance values.
  • step S304 the measurement circuit 304 measures a plurality of luminance values of a plurality of backlight blocks of the surface light emitting device 10 .
  • the measurement circuit 304 measures the corresponding luminance value for each backlight block.
  • Each backlight block has a corresponding luminance value.
  • step S306 the processing circuit 302 calculates a plurality of uniformity of the plurality of backlight blocks of the surface light emitting device 10 and sets a plurality of target uniformity according to the plurality of luminance values.
  • the processing circuit 302 calculates the uniformity of each backlight block according to the plurality of luminance values corresponding to the plurality of backlight blocks measured by the measurement circuit 304 . For example, for each backlight block, the processing circuit 302 sets a target luminance value, and calculates the ratio of the luminance value of each backlight block to the maximum luminance value among a plurality of target luminance values to obtain each backlight The uniformity of the blocks. As shown in FIG.
  • the surface light emitting device 20 with 5x5 backlight blocks is taken as an example for illustration.
  • the surface light emitting device 20 includes block columns BR1 - BR5 and block rows BC1 - BC5 .
  • the processing circuit 302 calculates the uniformity of each backlight block. As shown in FIG. 4 , the numbers in each backlight block indicate the uniformity of the backlight block. Wherein, part of the uniformity greater than 1 represents that the luminance value of the backlight block is greater than the maximum luminance value among the plurality of target luminance values.
  • the processing circuit 302 uses the target luminance value table to query the corresponding target luminance values of each backlight block.
  • the target luminance value table can be stored in a storage device (not shown in the figure) of the display device 1 in the form of a look-up table.
  • the processing circuit 302 can query the target luminance value table stored in the storage device to find out the target luminance value corresponding to each backlight block. After setting the target luminance value of each backlight block, the processing circuit 302 calculates the target uniformity of each backlight block according to the plurality of target luminance values corresponding to the plurality of backlight blocks.
  • the processing circuit 30 determines the maximum target luminance value among the plurality of target luminance values of the plurality of backlight blocks of the surface-emitting device 10 .
  • the processing circuit 302 calculates the ratio of the target luminance value of the backlight block to the maximum target luminance value among the plurality of target luminance values to obtain the target uniformity of the backlight block.
  • the processing circuit 302 sets and calculates the target uniformity of each backlight block.
  • the number in each backlight block indicates the target uniformity of the backlight block. Among them, only the uniformity in the middle is equal to 1, and all other uniformities are less than 1, which means that the backlight block is designed to have the maximum brightness in the middle according to requirements, and the brightness in the surrounding direction decreases gradually.
  • the processing circuit 302 first obtains the target uniformity of the central backlight block of the surface light emitting device 20 .
  • the central backlight block may be a backlight block located at the center or near the center of the surface light-emitting device 20 and at the junction of block columns and block rows.
  • the processing circuit 302 obtains the target uniformity of the backlight blocks located on both sides of the block row including the central backlight block among the plurality of block rows, and then calculates according to the formula to obtain each of the block rows.
  • the target luminance value of the backlight block is a backlight block located at the center or near the center of the surface light-emitting device 20 and at the junction of block columns and block rows.
  • the processing circuit 302 obtains the target uniformity of the backlight blocks located on the two side edges of the block row including the central backlight block in the plurality of block rows, and matches the target uniformity of the central backlight block, Then, the target luminance value of each backlight block of the block row is obtained by calculating according to the formula.
  • FIG. 6 is a schematic diagram of target luminance value calculation according to an embodiment of the present invention.
  • the backlight block B33 is the central backlight block.
  • the backlight block B33 is located at the junction of the block row BR3 and the block row BC3 of the surface emitting device 20 .
  • the processing circuit 302 obtains the target uniformity of the backlight block B33 (the central backlight block) and obtains the backlight blocks (backlight blocks B31, B35) corresponding to the two side edges of the block row BR3 of the backlight block B33 target uniformity.
  • the processing circuit 302 can calculate the target luminance values of the backlight blocks B33 , B31 and B35 according to the default target luminance values of the backlight blocks B33 , B31 and B35 by using the aforementioned calculation method of the target luminance values.
  • the default target luminance value can be set in advance.
  • the target uniformity of the backlight blocks B33, B31 and B35 can be set in advance or obtained by using a look-up table.
  • the processing circuit 302 can obtain the target uniformity of each backlight block of the block row BR3 by calculating according to the formula F1 and the target uniformity of the backlight blocks B33 , B31 and B35 .
  • the processing circuit 302 may perform a curve fitting operation on the target uniformity of the backlight blocks B33 , B31 and B35 based on the formula F1 to obtain the target uniformity of the backlight blocks B32 and B34 .
  • the curve C1 represents the curve of the formula F1.
  • the curve C1 is adopted as the curve of the normal distribution formula F1, but it is not limited thereto.
  • the processing circuit 302 obtains the target uniformity of the backlight blocks (backlight blocks B13, B53) corresponding to the two side edges of the block row BC3 of the backlight block B33, and the obtained result of the previous paragraph.
  • the target uniformity of the backlight block B33 central backlight block.
  • the processing circuit 302 may perform a curve fitting operation on the target uniformity of the backlight blocks B33 , B13 and B53 based on the formula F2 to obtain the target uniformity of the backlight blocks B23 and B43 .
  • the curve C2 represents the curve of the formula F2.
  • the curve C2 is adopted as the curve of the normal distribution formula F2, but it is not limited thereto.
  • the processing circuit 302 can set the target uniformity of the backlight blocks on the block column BR3 and the block row BC3 corresponding to the central backlight block (backlight block B33 ). Similarly, the processing circuit 302 can set the target uniformity of the backlight blocks on each block column and block row of the front-facing light-emitting device 20 . Moreover, the target uniformity of the central backlight block located at the junction of the block row BR3 and the block row BC3 is the same value whether it is on the curve C1 or the curve C2, which can ensure that the backlight block is designed according to the requirement.
  • the middle is the maximum brightness, and the brightness toward the surrounding direction will produce a decreasing effect according to the formulas F1 and F2, and if the formulas F1 and F2 are in a normal distribution, the decreasing effect will be smoother and there will be no steep drop.
  • the backlight block located at the center or near the center of the surface light-emitting device 20 and at the junction of block columns and block rows is defined as the central backlight block.
  • the maximum distance between the backlight block of the nearest edge and the central backlight block in the plurality of block rows of the surface light emitting device 20 may be greater than the backlight block of the nearest edge in the plurality of block rows of the surface light emitting device 20
  • the maximum distance from the central backlight block, and the adjustment value of the backlight block corresponding to the nearest edge of the plurality of block rows is greater than the adjustment value of the backlight block corresponding to the nearest edge of the plurality of block rows.
  • FIG. 7 is a schematic diagram of curves C1 and C2 applied to a surface light-emitting device with an aspect ratio for curve fitting calculation according to an embodiment of the present invention.
  • the number of block rows is greater than the number of block columns, so as shown in Figure 7, the curve C1 can span a large number of block rows, and the distance between the edge backlight block and the central backlight block is relatively long.
  • the curve C1 can rise from the edge backlight area to the central backlight area through a curve with a small curvature (smooth).
  • the curve C2 spans a small number of block columns. Relatively, the distance between the edge backlight blocks and the central backlight block is relatively short, so it is necessary to quickly pull out from the low brightness of the edge backlight blocks.
  • the high luminance of the central backlight block causes the curve C2 to rise from the edge backlight block to the central backlight block through a larger (steeper) curve.
  • the surface light-emitting device 20 with an aspect ratio will first use the curve C1 with a smaller curvature (relatively gentle) and the corresponding formula based on the uniformity of the central backlight block and the edge backlight block on the same block row.
  • F1 is used to determine the uniformity of the backlight blocks at other positions in the same block row.
  • a curve fitting operation is performed to determine the uniformity of the backlight blocks at other positions on the same block row.
  • the result of the curve fitting is the curve C2 with a larger (steeper) curvature.
  • the surface-emitting device 20 when the surface-emitting device 20 is designed with an aspect ratio of 16:9 or 16:10, the user can have a relatively gentle uniformity change in the direction of the long axis on the horizontal side, which is suitable for applications in visual Products with large angles, such as TVs, monitors, laptops, or car computers.
  • step S308 the processing circuit 302 generates a plurality of adjustment values according to the plurality of uniformity, the plurality of target uniformity, and the plurality of adjustment coefficients corresponding to the plurality of backlight blocks.
  • the backlight blocks of each block row correspond to corresponding adjustment coefficients.
  • the plurality of adjustment factors may be different.
  • the processing circuit 302 can calculate a plurality of adjustment values corresponding to a plurality of backlight blocks of the surface-emitting device 20 according to formula (1):
  • a i,k represents the adjustment value of the i-th backlight block in the k-th block row (BR k )
  • UT i,k represents the i-th backlight in the k-th block row (BR k )
  • the target uniformity of the block U i,k represents the uniformity of the i-th backlight block in the k-th block row (BR k )
  • G k represents the uniformity corresponding to the k-th block row (BR k ) .
  • G k is a real number.
  • the adjustment coefficients G1 - G5 correspond to the block rows BR1 - BR5 .
  • the processing circuit 302 can divide the target uniformity of the backlight block of each block column by the uniformity of the backlight block to generate a uniformity ratio, and calculate the uniformity ratio with the corresponding adjustment factor as an index. Exponential operation is performed to generate the adjustment value of the backlight block corresponding to the block row. For example, taking the block row BR1 as an example, the processing circuit 302 can calculate the adjustment value of each backlight block in the block row BR1 according to the formula (2).
  • a i,1 represents the adjustment value of the i-th backlight block in the block row BR1
  • UT i,1 represents the target uniformity of the i-th backlight block in the block row BR1
  • U i,1 represents the uniformity of the ith backlight block in the block row BR1
  • the processing circuit 302 can calculate the adjustment values corresponding to all the backlight blocks of the surface emitting device 20 .
  • the adjustment coefficient is an index, the change in the adjustment value is reflected in an exponential increase rather than a simple linear increase.
  • the uniformity ratio of the backlight block is greater than 1, the adjustment value can be enlarged more violently to increase the backlight.
  • the current value of the block is used to reinforce the insufficient brightness.
  • the adjustment coefficient G3 is based on the curve C1.
  • the adjustment coefficient G3 is the curvature of the curve C1.
  • the block row BC1 ⁇ BC5 taking the block row BC3 as an example, its adjustment coefficient is the curvature of the curve C2.
  • the curvatures of the curves C1 and C2 are the same; when the surface light-emitting device is a rectangle as shown in Figure 7, the curvature of the curve C1 on the long axis is small, and the curvature of the curve C2 on the short axis Large curvature.
  • the backlight blocks of each block column correspond to corresponding adjustment coefficients.
  • the plural adjustment coefficients are real numbers.
  • the plurality of adjustment factors may be different.
  • the adjustment coefficient G1 is different from the adjustment coefficient G2.
  • the backlight block located at the center or near the center of the surface light-emitting device 20 and at the junction of the block column and the block row can be defined as the central backlight block.
  • the backlight block B33 can be the central backlight block.
  • the minimum distance between the backlight block of the first block row and the central backlight block in the plurality of block rows of the surface-emitting device 20 is smaller than that of the plurality of block rows of the surface-emitting device 20.
  • the adjustment factor corresponding to the backlight block of the first block row in the plurality of block rows is greater than that corresponding to the plurality of block rows
  • the adjustment factor for the backlight block of the second block column in .
  • the backlight block B33 as the central backlight block as an example for illustration, since the minimum distance L1 from the block row BR1 to the backlight block B33 (ie, The vertical distance of the backlight block B33) is 2 backlight blocks.
  • the minimum distance L2 between the block row BR2 and the backlight block B33 ie, the vertical distance between the block row BR2 and the backlight block B33 ) is one backlight block.
  • the adjustment coefficient G2 of the backlight block corresponding to the block row BR2 is greater than the adjustment coefficient G1 of the backlight block corresponding to the block row BR1.
  • Fig. 10 Please also refer to Fig. 10.
  • the main purpose of this design is that the closer the light source 208 is to the edge, the less the luminance will be affected (the closer the range of the dotted line of the triangle in Fig. 10 is to the edge, the less light will be present), and the response will be gentler, so use
  • the adjustment factor with a smaller value on the contrary, the closer the light source 208 is to the center, the greater the influence of the luminance (the area of the dotted triangle line in Figure 10 produces a part of light overlap in the central area), and the adjustment factor with a larger value can be used .
  • the uniformity or luminance of the backlight blocks at different positions can be locally fine-tuned, and the luminance distribution performance of the surface light emitting device 20 can be effectively optimized, thereby significantly improving the problem of uneven luminance. question.
  • step S310 the driving circuit 306 generates a plurality of adjusted driving currents according to the plurality of adjustment values and the plurality of driving currents to drive the plurality of backlight blocks.
  • the processing circuit 302 calculates the current value of the plurality of adjusted driving currents according to the adjustment value obtained in step S308 and the plurality of driving currents used in step S302, and enables the driving circuit 306 to generate a plurality of adjusted driving currents to drive A plurality of backlight blocks of the surface emitting device 20 .
  • the driving circuit 306 For each backlight block, the driving circuit 306 generates an adjusted driving current corresponding to the backlight block.
  • the adjusted driving current of each backlight block may be the product of the adjusted value corresponding to the backlight block and the driving current corresponding to the backlight block.
  • the adjusted driving current I' of each backlight block can be expressed as follows:
  • I' i,k represents the adjusted driving current of the i-th backlight block in the k-th block column (BR k ), and A i,k represents the adjusted driving current of the k-th block column (BR k ).
  • the processing circuit 302 calculates the adjusted driving current corresponding to each backlight block.
  • the driving circuit 306 generates an adjusted driving current corresponding to each backlight block to drive the backlight block of the surface emitting device 20 .
  • the number in each backlight block represents the adjusted driving current corresponding to the backlight block, and the unit is mA.
  • the embodiment of the present invention uses the corresponding adjustment coefficient and adjustment value to generate the adjusted driving current, which can improve the uniformity of the display, realize the brightness of the dark area and the appearance compensation of the entire light-emitting surface, and can effectively optimize the surface light-emitting device 20. Luminance distribution performance to solve the problem of uneven brightness, but also make the adjusted driving current curve smoother and can effectively reduce the overall power consumption.
  • FIG. 9 is a schematic diagram of a process 9 of an embodiment of the present invention. Since the steps with the same step numbers in the flow charts of FIG. 3 and FIG. 9 have similar operation methods and functions, for the sake of brevity in the description, detailed descriptions are omitted here and will not be repeated here. As shown in FIG. 9, after step S308, step S902 is executed next.
  • step S902 the processing circuit 302 can further determine whether the uniformity of each backlight block is greater than its target uniformity, if the uniformity of the backlight block is greater than the target uniformity, that is, the uniformity If the ratio is less than 1, then step S310 is not executed, and the above-mentioned step of generating a plurality of adjusted driving currents by the driving circuit 306 is not executed for the backlight block, which means that the backlight block has sufficient brightness, and there is no need to lower the backlight block block's current value, reducing its brightness.
  • step S904 is executed, and the driving circuit 306 generates a driving current to drive the backlight blocks, wherein step S904 is similar to step S302. That is to say, for the backlight block whose uniformity is greater than the target uniformity, the driving circuit 306 generates an original driving current to drive the backlight block without adjustment. However, if the uniformity of other backlight blocks is still less than or equal to the target uniformity, that is, when the uniformity ratio is greater than or equal to 1, then the other backlight blocks still execute the above-mentioned driving circuit 306 to generate a plurality of adjusted driving currents. step, that is, step S310 is executed.
  • the adjustment coefficient is an index, it is reflected that the change of the adjustment value increases exponentially, rather than a simple linear increase.
  • the uniformity ratio of the backlight block is greater than 1, the adjustment value can be enlarged more drastically to improve the backlight area.
  • the current value of the block to reinforce the insufficient luminance.
  • FIG. 10 is a schematic diagram of another embodiment of a surface light emitting device 20 according to an embodiment of the present invention.
  • the surface emitting device 20 includes a light source module 202 and a backlight module 204 .
  • the light source module 202 includes a substrate 206 and a plurality of light sources 208 disposed on the substrate 206 .
  • the light source 208 is used for emitting light.
  • the light source 208 can be implemented by a light emitting diode (LED), a mini LED (mini LED) or any other device capable of emitting light.
  • the light emitted by the light source 208 illuminates the display panel 10 when it is turned on. As shown in Figure 10, the dotted lines are ray trajectories.
  • the backlight module 204 includes a diffusion plate 210 and an optical film 212 . Please refer to FIG. 11 .
  • FIG. 11 is a schematic diagram of the corresponding relationship between the backlight blocks and the light emitting blocks of the surface light emitting device 20 according to the embodiment of the present invention.
  • the backlight module 204 is disposed above the plurality of light sources 208 , and the backlight module 204 can define a plurality of backlight blocks B.
  • the light source module 202 can define a plurality of light-emitting blocks L, and at least one light source 208 is disposed in each light-emitting block L, and the number of the light-emitting blocks L is greater than or equal to the number of the backlight blocks.
  • FIG. 12 is a schematic diagram of the process 12 of the embodiment of the present invention. Process 12 includes the following steps:
  • Step S1200 start.
  • Step S1202 Generate a plurality of pre-driving currents to drive the surface-emitting device, so that the plurality of light-emitting blocks generate a plurality of luminance values.
  • Step S1204 Measure a plurality of luminance values of a plurality of light-emitting blocks.
  • Step S1206 Calculate the average value of the plurality of luminance values generated by the plurality of light-emitting blocks of the light source module, and calculate the standard deviation of the plurality of luminance values according to the average value of the plurality of luminance values.
  • Step S1208 Generate a plurality of compensation values when the standard deviation is greater than or equal to a threshold value and generate a plurality of compensation driving currents to drive a plurality of light-emitting blocks, until the standard deviation is less than the threshold value, stop generating the plurality of compensation values and The plurality of compensating driving currents are used as the plurality of driving currents to drive the surface emitting device.
  • Step S1210 end.
  • step 1202 the driving circuit 306 generates a plurality of pre-driving currents to drive the surface light emitting device 10, so that the plurality of backlight blocks of the surface light emitting device 10 generate a plurality of luminance values.
  • step S1204 the measurement circuit 304 measures a plurality of luminance values of a plurality of backlight blocks of the surface light emitting device 10 .
  • step S1206 the processing circuit 302 calculates the average value of the plurality of luminance values generated by the plurality of light-emitting blocks of the light source module 202 and calculates the standard deviation of the plurality of luminance values according to the average value of the plurality of luminance values .
  • step S1208 when the standard deviation is greater than or equal to the threshold value, the processing circuit 302 generates a plurality of compensation values to convert the plurality of pre-driving currents and the plurality of compensation values into a plurality of compensation driving currents.
  • the driving circuit 306 generates a plurality of compensating driving currents to drive a plurality of light emitting blocks of the surface emitting device 10 . In this way, it will be able to reinforce whether the bright area and the dark area are within the standard and solve the problem of the bright area being too bright and the dark area being too dark.
  • the processing circuit 302 stops generating the plurality of compensation values, and uses the plurality of compensation driving currents as the plurality of driving currents generated in step S302 of the aforementioned process 3 .
  • the aforementioned process 12 can be applied before the execution of process 3 to obtain a plurality of driving currents. In this way, the requirement of uniform brightness can be achieved more quickly and effectively.
  • Hardware can include analog, digital, and mixed circuits (ie, microcircuits, microchips, or silicon chips).
  • the electronic system may include a system on chip (SoC), a system in package (SiP), a computer on module (CoM) and a display device 1 .
  • SoC system on chip
  • SiP system in package
  • CoM computer on module
  • the process steps and embodiments of the present invention may exist in the form of program codes or instructions and be stored in a storage device.
  • the storage device may be a computer-readable storage medium, and the storage device may include read-only memory (ROM), flash memory (Flash Memory), random-access memory (random-access memory, RAM), user identification Module (Subscriber Identity Module, SIM), hard disk, floppy disk or CD-ROM (CD-ROM/DVD-ROM/BD-ROM), but not limited thereto.
  • ROM read-only memory
  • flash Memory Flash Memory
  • random-access memory random-access memory
  • SIM Subscriber Identity Module
  • CD-ROM/DVD-ROM/BD-ROM compact discs Read Only Memory
  • the processing circuit 302 can be used to read and execute program codes or instructions stored in the storage device to realize all the aforementioned steps and functions.
  • the processing circuit 302 can be a central processing unit (central processing unit, CPU), a microprocessor (microprocessor), a digital signal processor (digital signal processor, DSP), a programmable controller (programmable controller), a graphics processor (Graphic Processing Unit, GPU), programmable logic device (programmable logic device, PLD), or other similar devices, or a combination of these devices, but not limited thereto.
  • CPU central processing unit
  • microprocessor microprocessor
  • DSP digital signal processor
  • programmable controller programmable controller
  • graphics processor Graphic Processing Unit, GPU
  • PLD programmable logic device
  • driving the surface light-emitting device 20 through the adjusted driving current provided by the backlight control circuit of the embodiment of the present invention can improve display uniformity, achieve brightness compensation in dark areas and the appearance of the entire light-emitting surface, and effectively optimize
  • the luminance distribution performance of the surface light-emitting device 20 can significantly improve the problem of uneven brightness, effectively improve the contrast ratio and effectively reduce power consumption.
  • BC1-BC5 BCm: block row

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

本发明提供一种背光控制方法，用于面发光装置。背光控制方法包括产生复数个驱动电流以驱动面发光装置，以使复数个背光区块产生复数个辉度值；测量复数个背光区块的复数个辉度值；根据复数个辉度值计算出复数个背光区块的复数个均齐度以及设定复数个目标均齐度；根据复数个均齐度、复数个目标均齐度以及对应于复数个背光区块的复数个调整系数产生复数个调整值；以及根据调整值以及复数个驱动电流产生复数个调整后驱动电流以驱动复数个背光区块。

Description

背光控制方法及背光控制电路 技术领域
本发明涉及一种背光控制方法及背光控制电路，尤其涉及一种可提升显示均齐度的背光控制方法及背光控制电路。
背景技术
随着科技的发展与产业的进步，配置有液晶显示器的各式电子产品已成为用户生活中不可或缺的一部分，例如笔记本电脑、平板计算机、移动电话、电视等等。电子产品在使用时可通过所配置的显示器来播放显示影像让用户观看。由于显示面板本身不会发光，通常会利用背光装置来提供显示面板在显示影像时所需的背光源。举例来说，发光二极管(Light Emitting Diode，LED)由于具有省电、组件寿命长、无汞、色域丰富、无需暖灯时间以及反应速度快等优势，因此发光二极管已被广泛应用于背光装置。不过目前背光装置常见会有亮暗不均的问题而导致外观角落出现暗带或边缘出现暗线，同时均齐度也无法达到所需规格。再者，由于显示设备的尺寸越来越大，背光装置的功耗也变大。目前常见的解决方式之一为改变光源的排列方式，例如通过改变光源数组的间距来改善均齐度。另一种方式为利用光源分选(Bin)技术，采用不同等级光源的配置。然而，现有方式仍存有光源组件入料成本高与制程工时高的缺点。因此，如何能有效解决前述问题，便成为此技术领域的重要课题。
发明内容
本发明的目的在于提供一种可提升显示均齐度的背光控制方法及背光控制电路，以解决上述问题。
本发明提供一种背光控制方法，用于面发光装置，该面发光装置包括复数个第一群组与复数个第二群组，每一群组包括至少一个背光区块，沿着第一方向排列的背光区块被界定为第一群组，沿着第二方向排列的背光区块被界定为第二群组，且第一方向与第二方向是非平行的，该背光控制方法包括︰产生复数个驱动电流以驱动面发光装置，以使复数个背光区块产生复数个辉度值；测量复数个背光区块的复数个辉度值；根据复数个辉度值计算出复数个背光区块的复数个均齐度以及设定复数个目标均齐度；根据复数个均齐度、复数个目标均齐度以及对应于复数个背光区块的复数个调整系数产生复数个调整值；以及根据调整值以及复数个驱动电流产生复数个调整后驱动电流以驱动复数个背光区块。
本发明还提供一种背光控制电路，用以驱动面发光装置，该面发光装置包括复数个第一群组与复数个第二群组，每一群组包括至少一个背光区块，沿着第一方向排列的背光区块被界定为第一群组，沿着第二方向排列的背光区块被界定为第二群组，且第一方向与第二方向是非平行的，该背光控制电路包括︰驱动电路，用来产生复数个驱动电流以驱动面发光装置，以使复数个背光区块产生复数个辉度值；测量电路，用来测量复数个背光区块的复数个辉度值；以及处理电路，用来根据复数个辉度值计算出复数个背光区块的复数个均齐度以及设定复数个目标均齐度，以及根据复数个均齐度、复数个目标均齐度以及对应于复数个背光区块的复数个调整系数产生复数个调整值，以使得驱动电路根据调整值以及复数个驱动电流产生复数个调整后驱动电流以驱动复数个背光区块。
附图说明
图1为本发明实施例的显示装置的示意图。
图2为本发明实施例的面发光装置的示意图。
图3为本发明实施例的流程的示意图。
图4为本发明实施例的背光区块的均齐度的示意图。
图5为本发明实施例的背光区块的目标均齐度的示意图。
图6为本发明实施例的目标辉度值运算的示意图。
图7为本发明实施例的用于具有长宽比的面发光装置的曲线拟合运算的曲线的示意图。
图8为本发明实施例的背光区块的调整后驱动电流的示意图。
图9为本发明实施例的另一流程的示意图。
图10为本发明实施例的面发光装置的另一实施例的示意图。
图11为本发明实施例的背光区块与发光区块对应关系的示意图。
图12为本发明实施例的再一流程的示意图。
具体实施方式
请参考图1，图1为本发明实施例的显示装置1的示意图。显示装置1包含有显示面板10、面发光装置20以及背光控制电路30。显示面板10可为液晶显示器(Liquid Crystal Display，LCD)面板，但不以此为限。显示面板10设置于面发光装置20的上方。面发光装置20用来提供显示面板10所需的背光源。例如，请参考图2，图2为本发明实施例的面发光装置20的实施例的示意图。面发光装置20可分成复数个背光区块B。发光装置20的复数个背光区块对应于显示面板10的显示区域，以提供显示面板10的显示区域所需的背光源。其中，沿着方向D1(第一方向)排列的背光区块可界定为区 块列，或称为第一群组。沿着方向D2(第二方向)排列的背光区块可界定为区块行，或称为第二群组。方向D1与方向D2是非平行的。每一区块列以及区块行包括至少一个背光区块。如图2所示，面发光装置20包括区块列BR1～BRn以及区块行BC1～BCm。每一区块列包括m个背光区块，每一区块行包括n个背光区块。每一背光区块包含有至少一个光源，用以发射光线。光源点亮时所发射的光线照射至显示面板10。
背光控制电路30耦接到面发光装置20，用来驱动面发光装置20，以对显示面板10提供均匀背光源。背光控制电路30包含有处理电路302、测量电路304以及驱动电路306。测量电路304用以测量面发光装置20的背光区块的辉度值。测量电路304包含有影像传感器(未绘示于图中)，影像传感器可包含电荷耦合器件(Charge Coupled Device，CCD)影像传感器或互补金属氧化物半导体(CMOS)影像传感器，但不以此为限。驱动电路306用来产生复数个驱动电流、复数个预驱动电流或复数个调整后驱动电流以驱动面发光装置20。驱动电路306可为脉冲宽度调制(Pulse Width Modulation，PWM)电路。处理电路302耦接到测量电路304以及驱动电路306。处理电路302用来产生对应于复数个背光区块的调整值，以使得驱动电路306根据调整值以及驱动电流产生复数个调整后驱动电流以驱动复数个背光区块。此外，显示装置1还包括显示驱动电路(未绘示于图中)用以控制显示面板10的影像显示操作。
请参考图3，关于显示装置1的操作方法，可归纳为流程3，请参考图3，图3为本发明实施例的流程3的示意图。流程3包含以下步骤：
步骤S300：开始。
步骤S302：产生复数个驱动电流以驱动面发光装置，以使复数个背光区块产生复数个辉度值。
步骤S304：测量复数个背光区块的复数个辉度值。
步骤S306：根据复数个辉度值计算出复数个背光区块的复数个均齐度以及设定复数个目标均齐度。
步骤S308：根据复数个均齐度、复数个目标均齐度以及对应于复数个背光区块的复数个调整系数产生复数个调整值。
步骤S310：根据调整值以及复数个驱动电流产生复数个调整后驱动电流以驱动复数个背光区块。
步骤S312：结束。
根据流程3，在步骤S302中，驱动电路306产生复数个驱动电流以驱动面发光装置10，以使面发光装置10的复数个背光区块产生复数个辉度值。在步骤S304中，测量电路304测量出面发光装置10的复数个背光区块的复数个辉度值。例如，测量电路304针对每一背光区块测量出对应辉度值。每一背光区块具有对应的辉度值。
在步骤S306中，处理电路302根据复数个辉度值计算出面发光装置10的复数个背光区块的复数个均齐度以及设定复数个目标均齐度。处理电路302根据测量电路304所测量出对应于复数个背光区块的复数个辉度值计算出每一背光区块的均齐度。例如，针对每一背光区块，处理电路302设定目标辉度值，并且计算每一背光区块的辉度值与复数个目标辉度值当中的最大辉度值的比值以得到每一背光区块的均齐度。如图4所示，以具有5x5个背光区块的面发光装置20为例来做说明，面发光装置20包括区块列BR1～BR5以及区块行BC1～BC5。处理电路302计算出每一背光区块的均齐度。如图4所示，每一背光区块中的数字表示该背光区块的均齐度。其中，部分大于1的均齐度代表的即是背光区块的辉度值大于复数个目标辉度值当中的最大辉度值。
进一步地，在步骤S306中，在实施例中，处理电路302利用目标辉度值表来查询各背光区块的相应目标辉度值。其中目标辉度值表可以查找表形式被储存于显示设备1的储存装置(未绘示于图中)中。处理电路302可查询储存装置所储存的目标辉度值表，以查找出对应于各背光区块的目标辉度值。在设定各背光区块的目标辉度值后，处理电路302根据对应于复数个背光区块的复数个目标辉度值计算出每一背光区块的目标均齐度。例如，处理电路30判断出面发光装置10的复数个背光区块的复数个目标辉度值当中的最大目标辉度值。针对每一背光区块，处理电路302计算该背光区块的目标辉度值与复数个目标辉度值当中的最大目标辉度值的比值以得到该背光区块的目标均齐度。如图5所示，处理电路302设定并计算出每一背光区块的目标均齐度。每一背光区块中的数字表示该背光区块的目标均齐度。其中，只有正中间的均齐度等于1，其他所有均齐度皆小于1，代表的即是背光区块依需求是设计在正中间为最大亮度，往四周方向的亮度则递减。
在另一实施例中，处理电路302首先求得面发光装置20的中央背光区块的目标均齐度。中央背光区块可为位于面发光装置20的中央或邻近中央处且位于区块列与区块行的交界处的背光区块。处理电路302求得位于复数个区块列中包含有中央背光区块的区块列的两侧边缘的背光区块的目标均齐度，再依据公式来运算而获得该区块列的每一背光区块的目标辉度值。接着，处理电路302求得位于复数个区块行中包含有中央背光区块的区块行的两侧边缘的背光区块的目标均齐度，并搭配中央背光区块的目标均齐度，再依据公式来运算而获得该区块行的每一背光区块的目标辉度值。
例如，请参考图6，图6为本发明实施例的目标辉度值运算的示意图。以具有5x5个背光区块的面发光装置20为例来做说明，如图6所示，假设背光区块B33为中央背光区块。背光区块B33位于面发光装置20的区块列BR3 与区块行BC3的交界处。首先，处理电路302取得背光区块B33(中央背光区块)的目标均齐度以及取得对应于背光区块B33的区块列BR3的两侧边缘的背光区块(背光区块B31、B35)的目标均齐度。例如，处理电路302可依据背光区块B33、B31及B35的默认目标辉度值，利用前述目标辉度值的计算方式来计算出背光区块B33、B31及B35的目标辉度值。默认目标辉度值可以事先设定。例如，背光区块B33、B31及B35的目标均齐度可以是事先设定的或是利用查找表方式取得。处理电路302可依据公式F1与背光区块B33、B31及B35的目标均齐度来运算而获得区块列BR3的每一背光区块的目标均齐度。例如，处理电路302可基于公式F1对背光区块B33、B31及B35的目标均齐度进行曲线拟合(curve fitting)运算以得到背光区块B32及B34的目标均齐度。如图6所示，曲线C1表示公式F1的曲线，在本实施例中是采用曲线C1为常态分布公式F1的曲线，但不以此为限。
接着，请继续参考图6，处理电路302取得对应于背光区块B33的区块行BC3的两侧边缘的背光区块(背光区块B13、B53)的目标均齐度，以及前一段落所得到的背光区块B33(中央背光区块)的目标均齐度。例如，处理电路302可基于公式F2对背光区块B33、B13及B53的目标均齐度进行曲线拟合运算以得到背光区块B23及B43的目标均齐度。如图6所示，曲线C2表示公式F2的曲线，在本实施例中是采用曲线C2为常态分布公式F2的曲线，但不以此为限。如此一来，处理电路302可设定出对应于中央背光区块(背光区块B33)的区块列BR3以及区块行BC3上的背光区块的目标均齐度。同理，处理电路302可设定出面发光装置20各区块列及区块行上的背光区块的目标均齐度。而且位于区块列BR3以及区块行BC3交界处的中央背光区块，其目标均齐度不论是在曲线C1或是曲线C2都是相同的值，可确保背光区块依需求是设计在正中间为最大亮度，往四周方向的亮度则依照公式F1、 F2产生递减的效果，且公式F1、F2如果是常态分布，更能让递减效果较为平滑而不会有陡降的情况产生。
当应用在具有长宽比的面发光装置20时，定义位于面发光装置20的中央或邻近中央处且为区块列与区块行的交界处的背光区块为中央背光区块。面发光装置20的复数个区块列中的最邻近边缘的背光区块与中央背光区块之间的最大距离可大于面发光装置20的复数个区块行中的最邻近边缘的背光区块与中央背光区块之间的最大距离，并且对应于复数个区块列的最邻近边缘的背光区块的调整值大于对应于复数个区块行的最邻近边缘的背光区块的调整值。也就是说，区块列是沿着短轴方向排列设置，区块行则是沿着长轴方向排列设置。请参考图7，图7为本发明实施例应用于具有长宽比的面发光装置进行曲线拟合运算的曲线C1、C2的示意图。其中，区块行的数量是大于区块列的数量，所以如图7所示，曲线C1可以横跨数量较多的区块行，边缘背光区块与中央背光区块的距离较长，不需要从边缘背光区块的低辉度迅速拉升到中央背光区块的高辉度，造成曲线C1可以通过曲率较小(较平缓)的曲线从边缘背光区块朝向中央背光区块的方向上升。而如图7所示，曲线C2则横跨数量较少的区块列，相对地，边缘背光区块与中央背光区块的距离较短，有必要从边缘背光区块的低辉度迅速拉升到中央背光区块的高辉度，造成曲线C2需要通过曲率较大(较陡峭)的曲线从边缘背光区块朝向中央背光区块的方向上升。
因此，具有长宽比的面发光装置20，会先基于同一区块列上的中央背光区块与边缘背光区块的均齐度，以曲率较小(较平缓)的曲线C1及对应的公式F1来决定出同一区块列的其他位置背光区块的均齐度。然后再基于中央背光区块，以及同一区块行的边缘背光区块的均齐度，进行曲线拟合运算以决定出同一区块行上的其他位置背光区块的均齐度。而曲线拟合的呈现结果， 便是曲率较大(较陡峭)的曲线C2。利用此设计，当面发光装置20采用16：9或16：10的长宽比设计时，可以让使用者在水平侧的长轴方向，可以有较平缓的均齐度变化，适合应用在可视角度较大的产品，例如电视、屏幕、笔记本电脑或车载电脑等产品。
在步骤S308中，处理电路302根据复数个均齐度、复数个目标均齐度以及对应于复数个背光区块的复数个调整系数产生复数个调整值。例如，每一区块列的背光区块对应于相应调整系数。复数个调整系数可以是不同的。处理电路302可依据式(1)计算出对应于面发光装置20的复数个背光区块的复数个调整值︰
Figure PCTCN2021115842-appb-000001
其中，A i,k表示第k个区块列(BR k)中的第i个背光区块的调整值，UT i,k表示第k个区块列(BR k)中的第i个背光区块的目标均齐度，U i,k表示第k个区块列(BR k)中的第i个背光区块的均齐度，G k表示对应于第k个区块列(BR k)的调整系数，i＝1～m，k＝1～n，G k为实数。
请继续参考图4及图5，调整系数G1～G5对应于区块列BR1～BR5。处理电路302可将每一区块列的背光区块的目标均齐度除以该背光区块的均齐度以产生均齐度比值，并以相应调整系数为指数将该均齐度比值进行指数运算以产生对应于该区块列的背光区块的调整值。例如，以区块列BR1为例，处理电路302可依据式(2)计算出区块列BR1中的每一背光区块的调整值。
Figure PCTCN2021115842-appb-000002
其中，A i,1表示区块列BR1中的第i个背光区块的调整值，UT i,1表示区块列BR1中的第i个背光区块的目标均齐度，U i,1表示区块列BR1中的第i 个背光区块的均齐度，G 1表示对应于区块列BR1的调整系数，i＝1～m。
至于其他区块列BR2～BR5中的背光区块产生调整值的方式，则如同前述区块列BR1的产生方式，故不再赘述。如此一来，处理电路302可计算出对应于面发光装置20的所有背光区块的调整值。而且由于调整系数是指数，反应到调整值的变化是呈指数增加，而非单纯的线性增加，当背光区块的均齐度比值大于1时，可以更为剧烈地放大调整值，提高该背光区块的电流值，补强辉度不足之处。
至于如何决定调整系数的数值，则如下所述，请参阅图6，以调整系数G3来说，是依据曲线C1而来，例如调整系数G3即为曲线C1的曲率，如果是区块行BC1～BC5，以区块行BC3来说，其调整系数即为曲线C2的曲率。当面发光装置为图6所示的矩形时，曲线C1、C2的曲率相同，当面发光装置为图7所示的长方形时，在长轴的曲线C1的曲率较小，在短轴的曲线C2的曲率较大。
每一区块列的背光区块对应于相应调整系数。复数个调整系数为实数。复数个调整系数可以是不同的。例如，调整系数G1不同于调整系数G2。可定义位于面发光装置20的中央或邻近中央处且为区块列与区块行的交界处的背光区块为中央背光区块。例如，请继续参考图6，背光区块B33可为中央背光区块。在此情况下，在面发光装置20的复数个区块列中的第一区块列的背光区块与中央背光区块之间的最小距离小于面发光装置20的复数个区块列中的第二区块列的背光区块与中央背光区块之间的最小距离时，对应于复数个区块列中的第一区块列的背光区块的调整系数大于对应于复数个区块列中的第二区块列的背光区块的调整系数。
举例来说，请继续参考图4至图6，以背光区块B33为中央背光区块为例来做说明，由于区块列BR1到背光区块B33的最小距离L1(即区块列BR1 至背光区块B33的垂直距离)为2个背光区块。区块列BR2到背光区块B33的最小距离L2(即区块列BR2至背光区块B33的垂直距离)为1个背光区块。在此情况下，对应于区块列BR2的背光区块的调整系数G2大于对应于区块列BR1的背光区块的调整系数G1。
请一并参阅图10，此设计的主要目的是，越靠近边缘的光源208，辉度的影响幅度较少(图10的三角形虚线范围越靠近边缘就越少光线)，反应较为平缓，因此使用较小数值的调整系数，反之，越靠近中央的光源208，辉度的影响幅度较多(图10的三角形虚线范围在中央区域产生有一部分的光线重叠)，就可以使用较大数值的调整系数。如此一来，就可以依据实际辉度表现，局部微调不同位置的背光区块的均齐度或辉度，有效地优化面发光装置20的辉度分布表现，进而得以明显地改善亮度不均的问题。
在步骤S310中，驱动电路306根据复数个调整值以及复数个驱动电流产生复数个调整后驱动电流以驱动复数个背光区块。处理电路302根据步骤S308所得到的调整值以及步骤S302所使用的复数个驱动电流计算出复数个调整后驱动电流的电流值大小，并使驱动电路306据以产生复数个调整后驱动电流以驱动面发光装置20的复数个背光区块。针对每一背光区块，驱动电路306产生对应于该背光区块的调整后驱动电流。每一背光区块的调整后驱动电流可为对应于该背光区块的调整值与对应于该背光区块的驱动电流的乘积。例如，每一背光区块的调整后驱动电流I'可表示如下：
I′ i,k＝A i,k×I i,k      (3)
其中，I' i,k表示第k个区块列(BR k)中的第i个背光区块的调整后驱动电流，A i,k表示第k个区块列(BR k)中的第i个背光区块的调整值，I i,k表示第k个区块列(BR k)中的第i个背光区块的原始驱动电流(例如步骤S302 中所使用的驱动电流)，i＝1～m，k＝1～n。
因此，处理电路302计算出对应于每一背光区块的调整后驱动电流。驱动电路306据以产生对应于每一背光区块的调整后驱动电流以驱动面发光装置20的背光区块。如图8所示，每一背光区块中的数字表示对应于该背光区块的调整后驱动电流，单位为毫安。简言之，本发明实施例利用相应调整系数及调整值来产生调整后驱动电流将能提升显示均齐度、实现暗区亮度及整体发光面的外观补偿并能有效地优化面发光装置20的辉度分布表现，以解决亮度不均的问题，同时也使调整后驱动电流曲线更驱平滑而能有效地降低整体消耗功率。
在其他实施例中，请参考图9，图9为本发明实施例的流程9的示意图。由于图3与图9的流程中具有相同步骤编号的步骤具有类似的操作方式与功能，因此为求说明书内容简洁起见，详细说明便在此省略，在此不再赘述。如图9所示，在步骤S308后，接着执行步骤S902。在步骤S902中，处理电路302还可以再进一步判断每一背光区块的均齐度是否大于其目标均齐度，如果该背光区块的均齐度大于目标均齐度，也就是均齐度比值小于1，则不执行步骤S310，该背光区块不执行上述驱动电路306产生复数个调整后驱动电流的步骤，意指该背光区块已有足够辉度，不需要再调低该背光区块的电流值，降低其辉度。例如，在背光区块的均齐度大于目标均齐度时，执行步骤S904，驱动电路306产生驱动电流以驱动背光区块，其中步骤S904类似于步骤S302。也就是说，针对均齐度大于目标均齐度的背光区块，驱动电路306产生原始的驱动电流来驱动该背光区块而不做调整。但是如果其他背光区块的均齐度仍是小于或等于目标均齐度，也就是均齐度比值大于或等于1时，则其他背光区块依然执行上述驱动电路306产生复数个调整后驱动电流的步骤，亦即执行步骤S310。而且由于调整系数是指数，反应到调整值的变 化是呈指数增加，而非单纯的线性增加，当背光区块的均齐度比值大于1时，可以更为剧烈地放大调整值，提高背光区块的电流值，补强辉度不足之处。
请参考图10，图10为本发明实施例的面发光装置20的另一实施例的示意图。面发光装置20包括光源模块202与背光模块204。光源模块202包含有基板206与布设在基板206的复数个光源208。光源208用以发射光线。例如光源208可由发光二极管(LED)、迷你LED(mini LED)或是其他任何可发射光线的装置来实现。光源208点亮时所发射的光线照射至显示面板10。如图10所示，虚线为光线轨迹。背光模块204包括扩散板210及光学膜212。请参考图11，图11为本发明实施例的面发光装置20的背光区块与发光区块对应关系的示意图。背光模块204设置于复数个光源208的上方，且背光模块204可定义出复数个背光区块B。光源模块202可定义出复数个发光区块L，每一发光区块L内设置至少一个光源208，且复数个发光区块L的数量大于或等于复数个背光区块的数量。
前述图3所揭露的流程3是以光源模块202为均匀发光为前提来设计的，如果光源模块202本身有不均匀发光的缺陷，则需要先校正光源模块202使其均匀发光。如何产生校正后具有均匀发光特性的光源模块202则请参考图12，图12为本发明实施例的流程12的示意图。流程12包含以下步骤：
步骤S1200：开始。
步骤S1202：产生复数个预驱动电流以驱动面发光装置，以使复数个发光区块产生复数个辉度值。
步骤S1204：测量复数个发光区块的复数个辉度值。
步骤S1206：计算出光源模块的复数个发光区块所产生的复数个辉度值的平均值且根据复数个辉度值的平均值计算出复数个辉度值的标准差。
步骤S1208：在标准差大于或等于临限值时产生复数个补偿值并据以产生复数个补偿驱动电流以驱动复数个发光区块，直到标准差小于临限值时停止产生复数个补偿值并将复数个补偿驱动电流作为复数个驱动电流以驱动面发光装置。
步骤S1210：结束。
根据流程12，在步骤1202中，驱动电路306产生复数个预驱动电流以驱动面发光装置10，以使面发光装置10的复数个背光区块产生复数个辉度值。在步骤S1204中，测量电路304测量出面发光装置10的复数个背光区块的复数个辉度值。在步骤S1206中，处理电路302计算出光源模块202的复数个发光区块所产生的复数个辉度值的平均值并且根据复数个辉度值的平均值计算出复数个辉度值的标准差。在步骤S1208中，在标准差大于或等于临限值时，处理电路302产生复数个补偿值，以将复数个预驱动电流与复数个补偿值结合后转化为复数个补偿驱动电流。驱动电路306产生复数个补偿驱动电流以驱动面发光装置10的复数个发光区块。如此一来，将能补强亮区与暗区是否在标准之内而能解决亮区过亮及暗区太暗的问题。直到标准差小于临限值时，处理电路302停止产生复数个补偿值，并将复数个补偿驱动电流作为前述流程3的步骤S302所产生的复数个驱动电流。前述流程12可应用在流程3执行之前，以取得复数个驱动电流，如此一来，更能快速且有效达到亮度均匀的需求。
本领域普通技术人员可依本发明的精神加以结合、修饰或变化以上所述的实施例，而不限于此。上述所有的说明、步骤、及/或流程(包含建议步骤)，可通过硬件、软件、固件(即硬件装置与计算机指令的组合，硬件装置中的数据为只读软件数据)、电子系统、或上述装置的组合等方式实现。硬件可包含模拟、数字及混合电路(即微电路、微芯片或硅芯片)。电子系统可包含系 统级芯片(system on chip，SoC)、系统级封装(system in package，SiP)、计算机模块(computer on module，CoM)及显示装置1。本发明的流程步骤与实施例可以程序代码或指令的型态存在而储存于储存装置中。该储存装置可为计算机可读存储介质，该储存装置可包括只读存储器(read-only memory，ROM)、闪存(Flash Memory)、随机存取存储器(random-access memory，RAM)、用户身份识别模块(Subscriber Identity Module，SIM)、硬盘、软盘或光盘只读存储器(CD-ROM/DVD-ROM/BD-ROM)，但不以此为限。上述流程及实施例可被编译成程序代码或指令并储存于储存装置。处理电路302可用于读取与执行储存装置中所储存的程序代码或指令以实现前述所有步骤与功能。处理电路302可为中央处理器(central processing unit，CPU)、微处理器(microprocessor)、数字信号处理器(digital signal processor，DSP)、可编程控制器(programmable controller)、图形处理器(Graphic Processing Unit，GPU)、可编程逻辑器件(programmable logic device，PLD)、或其他类似的装置，或是该些装置的组合，但不以此为限。
综上所述，传统采用定电流调光的背光控制电路的显示设备常会有亮度不均(例如grid Mura明显)、四周暗带且对比度低的问题。相较之下，通过本发明实施例的背光控制电路所提供的调整后驱动电流来驱动面发光装置20将能提升显示均齐度、实现暗区亮度与整体发光面的外观补偿以及有效地优化面发光装置20的辉度分布表现，进而得以明显地改善亮度不均的问题，有效地提升对比度并有效地降低消耗功率。
以上所述仅为本发明的较佳实施例，凡依本发明申请专利范围所做的等同变化与修饰，皆应属本发明的覆盖范围。
【符号说明】
1:显示装置
10:显示面板
20:面发光装置
202:光源模块
204:背光模块
206:基板
208:光源
210:扩散板
212:光学膜
3,9,12:流程
30:背光控制电路
302:处理电路
304:测量电路
306:驱动电路
B,B13,B23,B31,B32,B33,B34,B35,B43,B53:背光区块
BC1-BC5,BCm:区块行
BR1-BR5,BRn:区块列
C1,C2:曲线
D1,D2:方向
G1-G5:调整系数
L:发光区块
S300,S302,S304,S306,S308,S310,S312,S902,S904,S1200,S1202,S1204,S1206,S1208,S1210:步骤

Claims (26)

  1. 一种背光控制方法，用于面发光装置，该面发光装置包括复数个第一群组与复数个第二群组，每一群组包括至少一个背光区块，沿着第一方向排列的背光区块被界定为所述第一群组，沿着第二方向排列的背光区块被界定为所述第二群组，且所述第一方向与所述第二方向是非平行的，所述背光控制方法包括︰
    产生复数个驱动电流以驱动所述面发光装置，以使复数个背光区块产生复数个辉度值；
    测量所述复数个背光区块的所述复数个辉度值；
    根据所述复数个辉度值计算出所述复数个背光区块的复数个均齐度以及设定复数个目标均齐度；
    根据所述复数个均齐度、所述复数个目标均齐度以及对应于所述复数个背光区块的复数个调整系数产生复数个调整值；以及
    根据所述调整值以及所述复数个驱动电流产生复数个调整后驱动电流以驱动所述复数个背光区块。
  2. 如权利要求1所述的背光控制方法，其中根据所述复数个辉度值计算出所述复数个背光区块的复数个均齐度以及设定复数个目标均齐度的步骤包括︰
    针对每一背光区块，设定目标辉度值，并且计算该背光区块的辉度值与所述复数个背光区块的所述复数个目标辉度值中的最大值的比值以得到该背光区块的均齐度。
  3. 如权利要求1所述的背光控制方法，其中根据所述复数个辉度值计算出所述复数个背光区块的复数个均齐度以及设定复数个目标均齐度的步骤包括︰
    针对每一背光区块，设定目标辉度值，并且计算该背光区块的目标辉度值与所述复数个背光区块的所述复数个目标辉度值中的最大值的比值以得到该背光区块的目标均齐度。
  4. 如权利要求1所述的背光控制方法，其中根据所述复数个辉度值计算出所述复数个背光区块的复数个均齐度以及设定复数个目标均齐度的步骤包括︰
    求得位于所述面发光装置的中央或邻近中央处且其中一个第一群组与其中一个第二群组的交界处的中央背光区块的目标均齐度，以及求得位于所述复数个第一群组中包含有所述中央背光区块的第一群组的两侧边缘背光区块的目标均齐度，再依据第一公式来运算而获得所述第一群组的每一背光区块的目标辉度值；
    求得位于所述复数个第二群组中包含有所述中央背光区块的第二群组的两侧边缘背光区块的目标均齐度，并搭配所述中央背光区块的目标均齐度，再依据第二公式来运算而获得所述第二群组的每一背光区块的目标辉度值；
    其中，所述第一公式所形成的曲线具有第一曲率，所述第二公式所形成的曲线具有第二曲率，所述第一曲率小于或等于所述第二曲率。
  5. 如权利要求4所述的背光控制方法，其中，定义位于所述面发光装置的中央或邻近中央处且其中一个第一群组与其中一个第二群组的交界处的背 光区块为中央背光区块，所述复数个第一群组的最邻近边缘的背光区块与所述中央背光区块之间的最大距离大于所述复数个第二群组的最邻近边缘的背光区块与所述中央背光区块之间的最大距离，以及所述第一曲率小于所述第二曲率。
  6. 如权利要求1所述的背光控制方法，其中所述复数个调整系数的第一调整系数对应于所述复数个第一群组中的第一个第一群组的背光区块，所述复数个调整系数的第二调整系数对应于所述复数第一个群组中的第二个第一群组的背光区块，以及所述第一调整系数不同于所述第二调整系数。
  7. 如权利要求6所述的背光控制方法，其中根据所述复数个均齐度、所述复数个目标均齐度以及对应于所述复数个背光区块的所述复数个调整系数产生所述复数个调整值的步骤包括︰
    针对所述复数个第一群组中的所述第一个第一群组的每一背光区块，将所述第一个第一群组的该背光区块的目标均齐度除以所述第一个第一群组的该背光区块的均齐度以产生第一均齐度比值，并以所述第一调整系数为指数将所述第一均齐度比值进行第一指数运算以产生对应于所述第一个第一群组的该背光区块的调整值；以及
    针对所述复数个第一群组中的所述第二个第一群组的每一背光区块，将所述第二个第一群组的该背光区块的目标均齐度除以所述第二个第一群组的该背光区块的均齐度以产生第二均齐度比值，并以所述第二调整系数为指数将所述第二均齐度比值进行第二指数运算以产生对应于所述第二个第一群组的该背光区块的调整值。
  8. 如权利要求6所述的背光控制方法，其中根据所述复数个均齐度、所述复数个目标均齐度以及对应于所述复数个背光区块的所述复数个调整系数产生所述复数个调整值的步骤依据下式来得到所述复数个调整值︰
    Figure PCTCN2021115842-appb-100001
    其中，A i,k表示第k个第一群组中的第i个背光区块的调整值，UT i,k表示所述第k个第一群组中的所述第i个背光区块的目标均齐度，U i,k表示所述第k个第一群组中的所述第i个背光区块的均齐度，G k表示对应于所述第k个第一群组的调整系数，i＝1～m，k＝1～n。
  9. 如权利要求6所述的背光控制方法，其中定义位于所述面发光装置的中央或邻近中央处且所述复数个第一群组的其中一个与所述复数个第二群组的其中一个的交界处的背光区块为中央背光区块，其中所述复数个第一群组中的第一个第一群组的背光区块与所述中央背光区块之间的最小距离小于所述复数个第一群组中的第二个第一群组的背光区块与所述中央背光区块之间的最小距离，以及对应于所述复数个第一群组中的所述第一个第一群组的背光区块的所述第一调整系数大于对应于所述复数个第一群组中的所述第二个第一群组的背光区块的所述第二调整系数。
  10. 如权利要求1所述的背光控制方法，其中根据所述调整值以及所述复数个驱动电流产生复数个调整后驱动电流以驱动所述复数个背光区块的步骤包括︰
    针对每一背光区块，产生对应于该背光区块的调整后驱动电流，其中该背光区块的调整后驱动电流为对应于该背光区块的调整值与对应于该背光区 块的驱动电流的乘积。
  11. 如权利要求1所述的背光控制方法，其中根据所述调整值以及所述复数个驱动电流产生复数个调整后驱动电流以驱动所述复数个背光区块的步骤包括︰
    针对每一背光区块，判断该背光区块的均齐度是否大于该背光区块的目标均齐度；
    在判断出该背光区块的均齐度大于该背光区块的目标均齐度时，产生对应于该背光区块的驱动电流以驱动该背光区块；以及
    在判断出该背光区块的均齐度小于或等于该背光区块的目标均齐度时，产生对应于该背光区块的调整后驱动电流以驱动该背光区块，其中对应于该背光区块的调整后驱动电流为对应于该背光区块的调整值与对应于该背光区块的驱动电流的乘积。
  12. 如权利要求1所述的背光控制方法，其中，所述面发光装置具有光源模块与背光模块，所述光源模块具有基板与布设在所述基板的复数个发光二极管，所述背光模块设置于所述复数个发光二极管的上方，且所述背光模块定义出所述复数个背光区块，所述光源模块定义出复数个发光区块，每一发光区块内设置至少一个发光二极管，且所述复数个发光区块的数量大于或等于所述复数个背光区块的数量。
  13. 如权利要求12所述的背光控制方法，还包括︰
    产生复数个预驱动电流以驱动所述面发光装置，以使所述复数个发光区块产生复数个辉度值；
    测量所述复数个发光区块的所述复数个辉度值；
    计算出所述光源模块的所述复数个发光区块所产生的所述复数个辉度值的平均值且根据所述复数个辉度值的平均值计算出所述复数个辉度值的标准差；
    在所述标准差大于或等于临限值时，产生复数个补偿值，以将所述复数个预驱动电流与所述复数个补偿值结合后转化为复数个补偿驱动电流以驱动所述复数个发光区块，直到所述标准差小于该临限值时，停止产生所述复数个补偿值，并将所述复数个补偿驱动电流作为前述产生所述复数个驱动电流以驱动所述面发光装置，以使所述复数个背光区块产生复数个辉度值的步骤中的所述复数个驱动电流。
  14. 一种背光控制电路，用以驱动面发光装置，所述面发光装置包括复数个第一群组与复数个第二群组，每一群组包括至少一个背光区块，沿着第一方向排列的背光区块被界定为所述第一群组，沿着第二方向排列的背光区块被界定为所述第二群组，且所述第一方向与所述第二方向是非平行的，该背光控制电路包括︰
    驱动电路，用来产生复数个驱动电流以驱动所述面发光装置，以使复数个背光区块产生复数个辉度值；
    测量电路，用来测量所述复数个背光区块的所述复数个辉度值；以及
    处理电路，用来根据所述复数个辉度值计算出所述复数个背光区块的复数个均齐度以及设定复数个目标均齐度，以及根据所述复数个均齐度、所述复数个目标均齐度以及对应于所述复数个背光区块的复数个调整系数产生复 数个调整值，以使得所述驱动电路根据所述调整值以及所述复数个驱动电流产生复数个调整后驱动电流以驱动所述复数个背光区块。
  15. 如权利要求14所述的背光控制电路，其中针对每一背光区块设定目标辉度值，并且所述处理电路计算该背光区块的辉度值与所述复数个背光区块的所述复数个目标辉度值中的最大值的比值以得到该背光区块的均齐度。
  16. 如权利要求14所述的背光控制电路，其中所述处理电路针对每一背光区块设定目标辉度值，并且计算该背光区块的目标辉度值与所述复数个背光区块的所述复数个目标辉度值中的最大值的比值以得到该背光区块的目标均齐度。
  17. 如权利要求14所述的背光控制电路，其中所述处理电路取得位于所述面发光装置的中央或邻近中央处且其中一个第一群组与其中一个第二群组的交界处的中央背光区块的目标均齐度以及取得位于所述复数个第一群组中包含所述中央背光区块的第一群组的两侧边缘背光区块的目标均齐度，再依据第一公式来运算而获得所述第一群组的每一背光区块的目标辉度值，以及所述处理电路取得位于所述复数个第二群组中包含所述中央背光区块的第二群组的两侧边缘背光区块的目标均齐度并搭配所述中央背光区块的目标均齐度，再依据第二公式来运算而获得所述第二群组的每一背光区块的目标辉度值；其中，所述第一公式所形成的曲线具有第一曲率，所述第二公式所形成的曲线具有第二曲率，所述第一曲率小于或等于所述第二曲率。
  18. 如权利要求17所述的背光控制电路，其中，定义位于所述面发光装 置的中央或邻近中央处且其中一个第一群组与其中一个第二群组的交界处的背光区块为中央背光区块，所述复数个第一群组的最邻近边缘的背光区块与所述中央背光区块之间的最大距离大于所述复数个第二群组的最邻近边缘的背光区块与所述中央背光区块之间的最大距离，以及所述第一曲率小于所述第二曲率。
  19. 如权利要求14所述的背光控制电路，其中所述复数个调整系数的第一调整系数对应于所述复数个第一群组中的第一个第一群组的背光区块，所述复数个调整系数的第二调整系数对应于所述复数第一个群组中的第二个第一群组的背光区块，以及所述第一调整系数不同于所述第二调整系数。
  20. 如权利要求19所述的背光控制电路，其中针对所述复数个第一群组中的所述第一个第一群组的每一背光区块，所述处理电路将所述第一个第一群组的该背光区块的目标均齐度除以所述第一个第一群组的该背光区块的均齐度以产生第一均齐度比值，并以所述第一调整系数为指数将所述第一均齐度比值进行第一指数运算以产生对应于所述第一个第一群组的该背光区块的调整值，以及针对所述复数个第一群组中的所述第二个第一群组的每一背光区块，所述处理电路将所述第二个第一群组的该背光区块的目标均齐度除以所述第二个第一群组的该背光区块的均齐度以产生第二均齐度比值，并以所述第二调整系数为指数将所述第二均齐度比值进行第二指数运算以产生对应于所述第二个第一群组的该背光区块的调整值。
  21. 如权利要求19所述的背光控制电路，其中所述处理电路根据所述复数个均齐度、所述复数个目标均齐度以及对应于所述复数个背光区块的所述 复数个调整系数产生所述复数个调整值，其中所述处理单元依据下式计算所述复数个调整值︰
    Figure PCTCN2021115842-appb-100002
    其中，A i,k表示第k个第一群组中的第i个背光区块的调整值，UT i,k表示所述第k个第一群组中的所述第i个背光区块的目标均齐度，U i,k表示所述第k个第一群组中的所述第i个背光区块的均齐度，G k表示对应于所述第k个第一群组的调整系数，i＝1～m，k＝1～n。
  22. 如权利要求19所述的背光控制电路，其中定义位于所述面发光装置的中央或邻近中央处且其中一个第一群组与其中一个第二群组的交界处的背光区块为中央背光区块，其中所述复数个第一群组中的第一个第一群组的背光区块与所述中央背光区块之间的最小距离小于所述复数个第一群组中的第二个第一群组的背光区块与所述中央背光区块之间的最小距离，以及对应于所述复数个第一群组中的所述第一个第一群组的背光区块的所述第一调整系数大于对应于所述复数个第一群组中的所述第二个第一群组的背光区块的所述第二调整系数。
  23. 如权利要求14所述的背光控制电路，其中针对每一背光区块，所述驱动电路产生对应于该背光区块的调整后驱动电流，其中该背光区块的调整后驱动电流为对应于该背光区块的调整值与对应于该背光区块的驱动电流的乘积。
  24. 如权利要求14所述的背光控制电路，其中针对每一背光区块，所述处理电路判断该背光区块的均齐度是否大于该背光区块的目标均齐度，在 所述处理电路判断出该背光区块的均齐度大于该背光区块的目标均齐度时所述驱动电路产生对应于该背光区块的驱动电流以驱动该背光区块，以及在所述处理电路判断出该背光区块的均齐度小于或等于该背光区块的目标均齐度时所述驱动电路产生对应于该背光区块的调整后驱动电流以驱动该背光区块，其中对应于该背光区块的调整后驱动电流为对应于该背光区块的调整值与对应于该背光区块的驱动电流的乘积。
  25. 如权利要求14所述的背光控制电路，其中，所述面发光装置包括光源模块与背光模块，所述光源模块包括基板与布设在所述基板的复数个发光二极管，所述背光模块设置于所述复数个发光二极管的上方，且所述背光模块定义出所述复数个背光区块，所述光源模块定义出复数个发光区块，每一发光区块内设置至少一个发光二极管，且所述复数个发光区块的数量大于或等于所述复数个背光区块的数量。
  26. 如权利要求25所述的背光控制电路，其中所述驱动电路产生复数个预驱动电流以驱动所述面发光装置，以使所述复数个发光区块产生复数个辉度值，所述测量电路测量所述复数个发光区块的所述复数个辉度值，所述处理电路计算出所述光源模块的所述复数个发光区块所产生的所述复数个辉度值的平均值且根据所述复数个辉度值的平均值计算出所述复数个辉度值的标准差，其中在所述标准差大于或等于临限值时所述处理电路产生复数个补偿值，以将所述复数个预驱动电流与所述复数个补偿值结合后转化为复数个补偿驱动电流，所述驱动电路产生所述复数个补偿驱动电流以驱动所述复数个发光区块，直到所述标准差小于所述临限值时，所述处理电路停止产生所 述复数个补偿值，并且将所述复数个补偿驱动电流作为所述复数个驱动电流以驱动所述面发光装置。
PCT/CN2021/115842 2021-08-31 2021-08-31 背光控制方法及背光控制电路 WO2023028895A1 (zh)

Priority Applications (9)

Application Number Priority Date Filing Date Title
CN202180007975.5A CN116235240A (zh) 2021-08-31 2021-08-31 背光控制方法及背光控制电路
PCT/CN2021/115842 WO2023028895A1 (zh) 2021-08-31 2021-08-31 背光控制方法及背光控制电路
TW110143276A TWI818359B (zh) 2021-08-31 2021-11-19 背光控制方法及背光控制電路
US17/897,243 US11769461B2 (en) 2021-08-31 2022-08-29 Backlight control method and backlight control circuit
TW111132599A TWI822281B (zh) 2021-08-31 2022-08-30 背光控制電路
PCT/CN2022/115661 WO2023030283A1 (zh) 2021-08-31 2022-08-30 背光控制电路
EP22863418.4A EP4379704A1 (en) 2021-08-31 2022-08-30 Backlight control circuit
CN202280018146.1A CN117083662A (zh) 2021-08-31 2022-08-30 背光控制电路
US18/402,645 US20240144890A1 (en) 2021-08-31 2024-01-02 Backlight control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/115842 WO2023028895A1 (zh) 2021-08-31 2021-08-31 背光控制方法及背光控制电路

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/897,243 Continuation US11769461B2 (en) 2021-08-31 2022-08-29 Backlight control method and backlight control circuit

Publications (1)

Publication Number Publication Date
WO2023028895A1 true WO2023028895A1 (zh) 2023-03-09

Family

ID=85386397

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/CN2021/115842 WO2023028895A1 (zh) 2021-08-31 2021-08-31 背光控制方法及背光控制电路
PCT/CN2022/115661 WO2023030283A1 (zh) 2021-08-31 2022-08-30 背光控制电路

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/115661 WO2023030283A1 (zh) 2021-08-31 2022-08-30 背光控制电路

Country Status (5)

Country Link
US (2) US11769461B2 (zh)
EP (1) EP4379704A1 (zh)
CN (2) CN116235240A (zh)
TW (2) TWI818359B (zh)
WO (2) WO2023028895A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111128081B (zh) * 2019-12-31 2021-10-01 深圳Tcl数字技术有限公司 电视背光调节方法、装置、设备及计算机可读存储介质

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101055376A (zh) * 2007-05-30 2007-10-17 友达光电股份有限公司 背光模块及其校正方法
CN101192375A (zh) * 2006-12-01 2008-06-04 索尼株式会社 用于控制背光的设备和方法以及液晶显示器
JP2010054726A (ja) * 2008-08-27 2010-03-11 Panasonic Corp バックライト装置およびこれを用いた映像表示装置
CN103606353A (zh) * 2013-11-19 2014-02-26 四川长虹电器股份有限公司 一种提升液晶显示产品亮度均匀性的方法
CN104011786A (zh) * 2011-12-26 2014-08-27 夏普株式会社 视频显示装置
CN212516503U (zh) * 2020-06-30 2021-02-09 宸盛光电有限公司 辉度均匀补偿系统

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8278846B2 (en) * 2005-11-18 2012-10-02 Cree, Inc. Systems and methods for calibrating solid state lighting panels
KR20070079455A (ko) * 2006-02-02 2007-08-07 삼성전자주식회사 복수 개의 발광소자를 구비한 백라이트 유닛 및 그 제어방법
US7717601B2 (en) * 2007-09-28 2010-05-18 Dell Products Lp Systems and methods for compensating brightness uniformity of backlit image displays
KR101289653B1 (ko) 2008-12-26 2013-07-25 엘지디스플레이 주식회사 액정표시장치
EP2378511A4 (en) 2009-01-20 2012-05-23 Panasonic Corp DISPLAY DEVICE AND DISPLAY CONTROL METHOD
TWI427598B (zh) 2009-12-29 2014-02-21 Au Optronics Corp 背光模組以及設定其驅動電流之方法
CN101763838B (zh) 2010-01-15 2013-11-06 友达光电股份有限公司 背光模块以及设定其驱动电流的方法
CN101894524B (zh) 2010-06-24 2012-05-09 彩虹集团公司 一种直下式白光led背光源控制方法
TW201305668A (zh) * 2011-04-15 2013-02-01 Semiconductor Energy Lab 導光元件，背光單元，及顯示裝置
JP2013148870A (ja) 2011-12-19 2013-08-01 Canon Inc 表示装置及びその制御方法
CN106205506B (zh) 2016-08-29 2019-07-09 青岛海信电器股份有限公司 减少液晶显示边缘偏色的方法及液晶显示装置
CN108428436B (zh) * 2018-05-08 2019-12-10 京东方科技集团股份有限公司 亮度补偿方法、亮度补偿装置、显示装置及存储介质
US11211018B1 (en) * 2020-06-25 2021-12-28 Xianyang Caihong Optoelectronics Technology Co., Ltd Grayscale compensation method and apparatus of display device
CN113870797A (zh) * 2020-06-30 2021-12-31 宸盛光电有限公司 辉度均匀补偿系统及方法
US11475865B2 (en) * 2020-08-28 2022-10-18 Apple Inc. Backlight reconstruction and compensation
US11594189B2 (en) * 2020-09-14 2023-02-28 Apple Inc. Backlight reconstruction and compensation-based throttling
CN114333707A (zh) * 2020-09-29 2022-04-12 中强光电股份有限公司 背光模块的驱动装置与驱动方法
CN113129846B (zh) 2021-04-13 2022-08-09 北京显芯科技有限公司 背光控制方法、设备、系统及存储介质
US11651744B2 (en) * 2021-10-14 2023-05-16 Dell Products L.P. Systems and methods for increasing backlight uniformity for backlit display panels

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101192375A (zh) * 2006-12-01 2008-06-04 索尼株式会社 用于控制背光的设备和方法以及液晶显示器
CN101055376A (zh) * 2007-05-30 2007-10-17 友达光电股份有限公司 背光模块及其校正方法
JP2010054726A (ja) * 2008-08-27 2010-03-11 Panasonic Corp バックライト装置およびこれを用いた映像表示装置
CN104011786A (zh) * 2011-12-26 2014-08-27 夏普株式会社 视频显示装置
CN103606353A (zh) * 2013-11-19 2014-02-26 四川长虹电器股份有限公司 一种提升液晶显示产品亮度均匀性的方法
CN212516503U (zh) * 2020-06-30 2021-02-09 宸盛光电有限公司 辉度均匀补偿系统

Also Published As

Publication number Publication date
EP4379704A1 (en) 2024-06-05
US20230077136A1 (en) 2023-03-09
US11769461B2 (en) 2023-09-26
WO2023030283A1 (zh) 2023-03-09
US20240144890A1 (en) 2024-05-02
CN116235240A (zh) 2023-06-06
TWI822281B (zh) 2023-11-11
CN117083662A (zh) 2023-11-17
TWI818359B (zh) 2023-10-11
TW202311829A (zh) 2023-03-16
TW202311827A (zh) 2023-03-16

Similar Documents

Publication Publication Date Title
US10504453B1 (en) Displays with adjustable direct-lit backlight units
JP5600387B2 (ja) 光源アセンブリ及びそれを有する液晶表示装置
US10964275B2 (en) Displays with adjustable direct-lit backlight units and adaptive processing
JP5950520B2 (ja) 光源装置
US10571744B1 (en) Displays with adjustable direct-lit backlight units and power consumption compensation
US20120105509A1 (en) Image display device, control device for same, and integrated circuit
CN109389947B (zh) 显示设备
US10192520B2 (en) Backlight unit, display panel and display device
CN103354935A (zh) 发光控制装置和方法、发光装置、图像显示装置、程序以及记录介质
US10986707B2 (en) Display device
US20240144890A1 (en) Backlight control circuit
CN109407409B (zh) 背光模组及其制作方法、显示装置
TW200935394A (en) Liquid crystal display device controlling method, liquid crystal display device, and electronic apparatus
US10923079B2 (en) Dual-cell display apparatus
US20140327708A1 (en) Display device
JP2008250174A (ja) バックライト装置、バックライト制御方法、および液晶表示装置
CN110534063B (zh) 区域调光的背光源调整方法与显示装置
WO2022222969A1 (zh) 一种背光模组的亮度调节方法及相关装置
US11972739B2 (en) Luminance control of backlight in display of image
US20220277699A1 (en) Color balancing in display of multiple images
US20220277700A1 (en) Gradation control in display of image
KR20240095161A (ko) 백라이트 제어 회로
US11869407B2 (en) Methods for compensating colors based on luminance adjustment parameters and the related display devices
TWI757078B (zh) 電子裝置及其亮度調整方法
US20240021145A1 (en) Display apparatus

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21955445

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE