WO2018228325A1 - 用于调节背光源的亮度的电路、系统及方法、背光源和显示装置 - Google Patents

用于调节背光源的亮度的电路、系统及方法、背光源和显示装置 Download PDF

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WO2018228325A1
WO2018228325A1 PCT/CN2018/090615 CN2018090615W WO2018228325A1 WO 2018228325 A1 WO2018228325 A1 WO 2018228325A1 CN 2018090615 W CN2018090615 W CN 2018090615W WO 2018228325 A1 WO2018228325 A1 WO 2018228325A1
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Prior art keywords
brightness
terminal
backlight
partitions
programmable voltage
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PCT/CN2018/090615
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English (en)
French (fr)
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陈硕
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京东方科技集团股份有限公司
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Priority to US16/330,585 priority Critical patent/US10986710B2/en
Publication of WO2018228325A1 publication Critical patent/WO2018228325A1/zh

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/12—Controlling the intensity of the light using optical feedback
    • 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
    • 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
    • G09G3/36—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 using liquid crystals
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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

Definitions

  • the present disclosure relates to the field of display technologies, and more particularly to circuits, systems, and methods for adjusting the brightness of a backlight.
  • a backlight module typically includes a backlight and a driving circuit for driving the backlight.
  • the backlight typically includes multiple partitions, each partition including a plurality of light emitting diodes (LEDs) as a light source. In operation, there may be differences in the brightness of different partitions of the backlight.
  • LEDs light emitting diodes
  • an electrical circuit for adjusting the brightness of a backlight includes a plurality of partitions that are independent of each other.
  • Each of the partitions includes a plurality of light emitting diodes (LEDs) arranged in an array and connected in series.
  • the circuit includes: a plurality of LED drivers, each LED driver configured to supply a respective one of a plurality of LEDs of a respective one of the plurality of partitions; and a plurality of programmable voltage generators, It is configured to receive a respective control command and to supply a respective reference voltage to the plurality of LED drivers based on the respective control command.
  • Each of the LED drivers is further configured to set a level of the drive current supplied by the LED driver in response to the reference voltage supplied to the LED driver.
  • each of the LED drivers has a first terminal for outputting an internal reference voltage and a second terminal for receiving the reference voltage supplied to the LED driver.
  • Each of the programmable voltage generators includes a resistor and a digital potentiometer connected in series between the first terminal and a ground terminal via the second terminal. The digital potentiometer is configured to set the reference voltage supplied by the programmable voltage generator by changing a resistance of the digital potentiometer in response to the control command received by the programmable voltage generator.
  • the resistor is coupled between the first terminal and the second terminal
  • the digital potentiometer is coupled between the second terminal and the ground terminal.
  • the digital potentiometer is coupled between the first terminal and the second terminal, and the resistor is coupled between the second terminal and the ground terminal.
  • the plurality of programmable voltage generators includes at least one programmable voltage source configured to generate the respective reference voltage in response to the respective control command.
  • a system for adjusting the brightness of a backlight includes a plurality of partitions that are independent of each other.
  • Each of the partitions includes a plurality of light emitting diodes (LEDs) arranged in an array and connected in series.
  • LEDs light emitting diodes
  • the system includes a luminance meter configured to measure respective brightness of the plurality of partitions of the backlight, and a controller configured to generate a respective control command based on the measured respective brightness and a target brightness;
  • the circuit includes: a plurality of LED drivers, each LED driver configured to supply a respective one of a plurality of LEDs of a respective one of the plurality of partitions; and a plurality of programmable voltage generators Configuring to receive the respective control command and to supply a respective reference voltage to the plurality of LED drivers based on the respective control command.
  • Each of the LED drivers is further configured to set a level of the drive current supplied by the LED driver in response to the reference voltage supplied to the LED driver.
  • the controller is further configured to: receive a first input indicative of the measured respective brightness and a second input indicative of the target brightness; determine whether the measured corresponding brightness is related to the target The brightness is the same; and in response to determining that at least one of the measured respective brightness is different from the target brightness, generating the plurality of the difference between the measured corresponding brightness and the target brightness.
  • the respective control command of the programmable voltage generator the respective control command configured to instruct the plurality of programmable voltage generators to adjust the respective reference voltages supplied to the plurality of LED drivers such that The respective brightness of the plurality of partitions is substantially equal to the target brightness.
  • the circuitry is local to the backlight, the controller is located remotely from the backlight, and the system further includes a signal converter configured to generate the controller The respective control command is programmed into the plurality of programmable voltage generators.
  • the luminance meter comprises a charge coupled device (CCD) based optical illuminometer.
  • CCD charge coupled device
  • a method for adjusting brightness of a backlight includes a plurality of partitions that are independent of each other.
  • Each of the partitions includes a plurality of light emitting diodes (LEDs) arranged in an array and connected in series.
  • the method includes measuring a respective brightness of the plurality of partitions of the backlight; generating a corresponding control command based on the measured respective brightness and a target brightness; and adjusting the supply to the according to the corresponding control command Driving currents of the plurality of LEDs of at least one of the plurality of partitions such that respective brightnesses of the plurality of partitions are substantially equal to the target brightness.
  • the generating the corresponding control command comprises: receiving a first input indicating the measured corresponding brightness and a second input indicating the target brightness; determining whether the measured corresponding brightness is Generating the target brightnesses; and in response to determining that at least one of the measured respective brightnesses is not equal to the target brightness, generating the corresponding one based on the measured difference between the respective brightness and the target brightness control commands.
  • a backlight comprising: a plurality of partitions independent of each other, each of the partitions comprising a plurality of light emitting diodes (LEDs) arranged in an array and connected in series; The circuit described.
  • LEDs light emitting diodes
  • a display device comprising the backlight as described above.
  • FIG. 1 is a schematic diagram of a typical display device including a backlight having a plurality of partitions
  • FIG. 2 is a schematic diagram of a system for adjusting brightness of a backlight, in accordance with an embodiment of the present disclosure
  • 3A is a schematic diagram of a brightness adjustment circuit for a single partition of a backlight in the system of FIG. 2;
  • Figure 3B is a schematic illustration of a variation of the circuit of Figure 3A;
  • FIG. 3C is a schematic diagram of another variation of the circuit of FIG. 3A;
  • FIG. 4 is a flowchart of a method for adjusting brightness of a backlight, in accordance with an embodiment of the present disclosure
  • FIG. 5 is a flow chart of the steps of generating a control command in the method of FIG.
  • the present disclosure proposes to open an interface for adjusting the brightness of the backlight source to a user of the backlight (e.g., a display manufacturer) to enable the user to modify the original settings of the backlight according to his or her own needs. This is advantageous in eliminating the factory defects of the backlight and improving the display quality of the display as the final product.
  • FIG. 1 is a schematic diagram of a typical display device 100 including a backlight B having a plurality of partitions.
  • the display device 100 includes a backlight B including a plurality of mutually independent partitions B 1 , B 2 , B 3 . . . B n-2 , B n-1 , B n , each of which includes A plurality of light emitting diodes (LEDs) arranged in series and connected in series.
  • LEDs light emitting diodes
  • display device 100 can be any display incorporating backlight B as shown and described, such as a liquid crystal display, an electronic ink display, and the like. However, other details of the display device 100 are not shown in order not to obscure the subject matter of the present disclosure. It will also be understood that the arrangement of the various partitions shown and the number of LEDs included in each partition are exemplary, and other embodiments are possible.
  • system 200 is a schematic diagram of a system 200 for adjusting the brightness of a backlight, in accordance with an embodiment of the present disclosure. As shown in FIG. 2, system 200 includes display device 210, luminance meter 220, and controller 230.
  • the display device 210 can take the form of the display device 100 of FIG. 1 and includes a backlight including the plurality of mutually independent partitions B 1 , B 2 , B 3 . . . B n-2 , B n-1 , B n . Partitions B 1 and B n are shown in FIG. 2.
  • the backlight of Figure 2 is also provided with circuitry for adjusting the brightness of the partition, comprising a plurality of LED drivers 211 1 ... 211 n and a plurality of programmable voltage generators 212 1 ... 212 n .
  • the partition B 1 is provided with a LED driver 2111 and the programmable voltage generator 2121, B n and the partition is provided with an LED driver 211 and n-programmable voltage generator 212 n.
  • the LED drivers 211 1 . . . 211 n are configured to supply respective drive currents I LED1 . . . I LEDn to the plurality of partitions B 1 . . . B n .
  • the programmable voltage generators 212 1 . . . 212 n are configured to receive respective control commands CMD 1 . . . CMD n and to the LED driver 211 1 based on the respective control commands CMD 1 . . . CMD n ...
  • the LED drivers 211 1 . . . 211 n are also configured to set the levels of respective drive currents I LED1 . . . I LEDn in response to respective reference voltages VREF 1 . . . VREF n .
  • the luminance meter 220 is configured to measure a respective brightness of the plurality of partitions B 1 . . . B n .
  • Examples of the luminance meter 220 include various charge coupled device (CCD) based optical illuminometers that are commercially available. Other types of luminance meters are also possible.
  • CCD charge coupled device
  • the controller 230 is configured to generate the respective control commands CMD 1 . . . CMD n based on the measured respective brightness and a target brightness. Specifically, the controller 230 receives a first input IN1 indicating the measured respective brightness and a second input IN2 indicating the target brightness. In some embodiments, the controller 230 can receive the first input IN via a data transfer interface or a human interface. The controller 230 can also receive the second input IN2 entered by the user via the human machine interaction interface. Alternatively, the second input IN may be pre-built in a memory accessible by the controller 230. Controller 230 then determines if the measured corresponding brightness is equal to the target brightness.
  • the controller 230 in response to the determination that at least one of the measured respective brightnesses is not equal to the target brightness, the controller 230 generates a value for the difference between the measured corresponding brightness and the target brightness the plurality of the programmable voltage generator 212 1 ?? 212 n corresponding to the control command CMD 1 ?? CMD n.
  • the respective control commands CMD 1 . . . CMD n are configured to instruct the programmable voltage generators 212 1 . . . 212 n to adjust the respective reference voltages VREF supplied to the LED drivers 211 1 . . . 211 n 1 ... VREF n such that the respective brightness of the plurality of partitions B 1 . . . B n is substantially equal to the target brightness.
  • controller is used herein to describe a variety of different devices related to the operation of a backlight.
  • Controller 230 can be implemented in a number of ways (e.g., such as with dedicated hardware) to perform the various functions discussed herein.
  • a "processor” is an example of a controller 230 that employs one or more microprocessors that can be programmed using software (e.g., microcode) to perform the various functions discussed herein.
  • the controller 230 can be implemented with or without a processor, and can also be implemented as dedicated hardware that performs some functions and a processor that performs other functions (eg, one or more programmed microprocessors and associated circuits) System) combination.
  • controller components that may be employed in various different embodiments of the present disclosure include, but are not limited to, conventional microprocessors, application specific integrated circuits (ASICs), and field programmable gate arrays (FPGAs).
  • controller 230 can be associated with one or more storage media (collectively referred to herein as "memory”, such as volatile and nonvolatile, such as RAM, PROM, EPROM, and EEPROM. Sexual computer memory, floppy disk, compact disk, optical disk, tape, etc.) associated.
  • the storage medium can be encoded with one or more programs that, when executed on one or more processors, perform at least some of the functions discussed herein.
  • programs may be fixed in the processor or may be transportable such that the one or more programs stored thereon can be loaded into the processor to implement various aspects discussed herein.
  • program or "computer program” is used herein in a generic sense to refer to any type of computer code (eg, software or microcode) that can be employed to program one or more processors.
  • the circuitry including LED drivers 211 1 . . . 211 n and programmable voltage generators 212 1 . . . 212 n is local to the backlight, such as LEDs integrated with the backlight, and The controller 230 is located remotely from the backlight, for example, separate from the display device 210.
  • the system 200 further includes a signal converter 240 configured to program the respective control commands CMD 1 . . . CMD n generated by the controller 230 to the programmable voltage generation 212 1 ... 212 n .
  • An example of signal converter 240 is a programmer.
  • the controller 230 can also be local to the backlight or display device 210, in which case the signal converter 240 is optional because the control commands CMD 1 ... CMD n can be programmed directly to the bus via the bus The programmable voltage generators 212 1 . . . 212 n .
  • 3A is a schematic diagram of a brightness adjustment circuit for a single partition of a backlight in the system 200 of FIG. 2. Specifically, LED driver 2111 and the programmable voltage generator 212 1 is shown in FIG. 3A.
  • the LED driver 2111 may be a reference voltage VREF 1 can be adjusted according to the output current I LED1 any commercially available LED driver chip, such as a switch mode LED driver chip of HV9911 from Supertex TM.
  • any commercially available LED driver chip such as a switch mode LED driver chip of HV9911 from Supertex TM.
  • the LED driver HV9911 2111 having a first output terminal of the internal voltage reference V con and a second terminal for receiving the voltage of the VREF reference 1
  • the output current I HV9911 LED1 is proportional to the reference voltage VREF 1 . More information about HV9911 can be found at www.supertex.com .
  • the programmable voltage generator 212 1 is used to provide the LED driver 211 1 with a variable reference voltage VREF 1 .
  • the programmable voltage generator 2121 comprises a second terminal via the HV9911 series resistors R con and the digital potentiometer R var HV9911 between the first terminal and a ground terminal.
  • the resistor R con is connected between the first terminal and the second terminal
  • the digital potentiometer R var is connected between the second terminal and the ground terminal.
  • the digital potentiometer 2121 is configured to in response to the received control command CMD 1 changes the resistance of the digital potentiometer 2121 is set to the reference voltage VREF 1.
  • FIG. 3B is a schematic illustration of a variation of the circuit of Figure 3A.
  • the circuit of Figure 3B is similar to the circuit of Figure 3A except that the resistor Rcon and the digital potentiometer Rvar are now swapped.
  • the digital potentiometer R var is connected between the first terminal and the second terminal of the HV9911, and the resistor R con is connected to the second terminal of the HV 9911 and the Between the ground terminals.
  • FIG. 3C is a schematic diagram of another variation of the circuit of FIG. 3A.
  • LED drivers 2111 may take the same form in FIG. 3A
  • the programmable voltage generator 2121 is a programmable voltage source U var.
  • a voltage source U var response to a control command CMD 1 and providing a reference voltage VREF 1 directly to the LED driver 2111.
  • One or more voltage sources U var may be implemented by a commercially available chip voltage generator, such as a multi-channel from intersil TM chip programmable voltage generator ISL24853A. More information about the ISL24853A can be found at www.intersil.com .
  • FIG. 4 is a flow chart of a method 400 for adjusting the brightness of a backlight, in accordance with an embodiment of the present disclosure.
  • the method 400 can be implemented by the system 200 described above with respect to FIG. 2, wherein the backlight includes a plurality of partitions B 1 . . . B n independent of each other, each of the partitions being arranged in an array And a plurality of LEDs connected in series.
  • a respective brightness of the plurality of partitions of the backlight is measured. This can be performed by the luminance meter 220 of FIG.
  • a corresponding control command is generated based on the measured respective brightness and a target brightness.
  • the control commands CMD 1 . . . CMD n are configured to instruct the programmable voltage generators 212 1 . . . 212 n to adjust the supply to the LED drivers 211 1 . . . 211 n
  • Corresponding reference voltages VREF 1 . . . VREF n such that the respective brightness of the partitions B 1 . . . B n is substantially equal to the target brightness.
  • a drive current of the plurality of LEDs supplied to at least one of the plurality of partitions is adjusted according to the respective control command such that respective brightnesses of the plurality of partitions are substantially equal to the target brightness.
  • this can be performed by the programmable voltage generators 212 1 . . . 212 n of FIG. 2 and the LED drivers 211 1 . . . 211 n .
  • steps 410-430 may need to be performed iteratively before the respective brightness of the plurality of partitions is substantially equal to the target brightness.
  • FIG. 5 is a flow diagram of step 420 in method 400 of FIG.
  • controller 230 can receive the measured luminance data from luminance meter 220 via a data transfer interface such as a universal serial bus (USB) interface, a wireless or wired network interface.
  • the controller 230 may receive brightness data entered by the user via a human interface such as a keyboard, touch screen, or the like.
  • the controller 230 can also receive luminance data indicating the target brightness.
  • the corresponding control is generated based on the measured difference between the respective brightness and the target brightness command.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract

一种用于调节背光源（B）的亮度的电路。背光源（B）包括相互独立的多个分区（B1,B2,B3,…,Bn-2,Bn-1,Bn）。分区（B1,B2,B 3,…,Bn-2,Bn-1,Bn）中的每一个包括呈阵列排布且串联的多个发光二极管（LED）。电路包括：多个LED驱动器（2111,..., 211n），每个LED驱动器（2111,..., 211n）被配置成向多个分区（B1,B2,B3,…,Bn-2,Bn-1,Bn）中的相应一个分区（B1,B2,B3,…,Bn-2, n-1,Bn）的多个发光二极管（LED）供应一相应的驱动电流（ILED1,..., ILEDn）；以及多个可编程电压生成器（2111,...,212n），被配置成接收相应的控制命令（CMD1,...,CMDn）并且基于相应的控制命令（CMD1,...,CMDn）向多个LED驱动器（2111,...,211n）供应相应的参考电压（VREF1,...,VREF n）。LED驱动器（2111,...,211n）中的每一个还被配置成响应于供应给该LED驱动器（2111,...,211n）的参考电压（VREF 1,...,VREF n）而设定由该LED驱动器（2111,..., 211n）供应的驱动电流（ILED1,..., ILEDn）的水平。

Description

用于调节背光源的亮度的电路、系统及方法、背光源和显示装置
相关申请的交叉引用
本申请要求2017年6月14日提交的中国专利申请No.201710447956.X的权益，其全部公开内容通过引用合并于此。
技术领域
本公开涉及显示技术领域，尤其涉及用于调节背光源发光亮度的电路、系统及方法。
背景技术
作为液晶显示器的组成部分，背光模组典型地包括背光源和用于驱动背光源的驱动电路。对于大尺寸液晶显示器来说，背光源通常包括多个分区，每个分区包括多个发光二极管(LED)作为光源。在操作中，背光源不同分区的亮度可能存在差异。
发明内容
根据本公开的一方面，提供了一种用于调节背光源的亮度的电路。所述背光源包括相互独立的多个分区。所述分区中的每一个包括呈阵列排布且串联的多个发光二极管(LED)。所述电路包括：多个LED驱动器，每个LED驱动器被配置成向所述多个分区中的相应一个分区的所述多个LED供应一相应的驱动电流；以及多个可编程电压生成器，被配置成接收相应的控制命令并且基于所述相应的控制命令向所述多个LED驱动器供应相应的参考电压。所述LED驱动器中的每一个还被配置成响应于供应给该LED驱动器的所述参考电压而设定由该LED驱动器供应的所述驱动电流的水平。
在一些实施例中，所述LED驱动器中的每一个具有用于输出内部参考电压的第一端子和用于接收供应给该LED驱动器的所述参考电压的第二端子。所述可编程电压生成器中的每一个包括经由所述第二端子串联在所述第一端子与一接地端子之间的电阻器和数字电位器。所述数字电位器被配置成通过响应于由该可编程电压生成器接收的所述控制命令改变该数字电位器的电阻而设定由该可编程电压生成器供应 的所述参考电压。
在一些实施例中，所述电阻器连接在所述第一端子与所述第二端子之间，并且所述数字电位器连接在所述第二端子与所述接地端子之间。
在一些实施例中，所述数字电位器连接在所述第一端子与所述第二端子之间，并且所述电阻器连接在所述第二端子与所述接地端子之间。
在一些实施例中，所述多个可编程电压生成器包括至少一个可编程电压源，其被配置成响应于所述相应的控制命令生成所述相应的参考电压。
根据本公开的另一方面，提供了一种用于调节背光源的亮度的系统。所述背光源包括相互独立的多个分区。所述分区中的每一个包括呈阵列排布且串联的多个发光二极管(LED)。所述系统包括：亮度计，被配置成测量所述背光源的所述多个分区的相应亮度；控制器，被配置成基于所测得的相应亮度和一目标亮度生成相应的控制命令；以及电路，包括：多个LED驱动器，每个LED驱动器被配置成向所述多个分区中的相应一个分区的所述多个LED供应一相应的驱动电流；以及多个可编程电压生成器，被配置成接收所述相应的控制命令并且基于所述相应的控制命令向所述多个LED驱动器供应相应的参考电压。所述LED驱动器中的每一个还被配置成响应于供应给该LED驱动器的所述参考电压而设定由该LED驱动器供应的所述驱动电流的水平。
在一些实施例中，所述控制器还被配置成：接收指示所测得的相应亮度的第一输入和指示所述目标亮度的第二输入；确定所测得的相应亮度是否与所述目标亮度相同；以及响应于所测得的相应亮度中的至少一个不同于所述目标亮度的确定，根据所测得的相应亮度与所述目标亮度之间的差值，生成用于所述多个可编程电压生成器的所述相应的控制命令，所述相应的控制命令被配置成指示所述多个可编程电压生成器调节供应给所述多个LED驱动器的所述相应的参考电压，使得所述多个分区的相应亮度基本上等于所述目标亮度。
在一些实施例中，所述电路位于所述背光源本地，所述控制器位于距所述背光源远程处，并且所述系统还包括信号转换器，其被配置成将所述控制器生成的所述相应的控制命令编程到所述多个可编程电压生成器中。
在一些实施例中，所述亮度计包括基于电荷耦合器件(CCD)的光学照度计。
根据本公开的又另一方面，提供了一种用于调节背光源的亮度的方法。所述背光源包括相互独立的多个分区。所述分区中的每一个包括呈阵列排布且串联的多个发光二极管(LED)。所述方法包括：测量所述背光源的所述多个分区的相应亮度；基于所测得的相应亮度和一目标亮度生成相应的控制命令；以及根据所述相应的控制命令调节供应给所述多个分区中的至少一个分区的所述多个LED的驱动电流，使得所述多个分区的相应亮度基本上等于所述目标亮度。
在一些实施例中，所述生成所述相应的控制命令包括：接收指示所测得的相应亮度的第一输入和指示所述目标亮度的第二输入；确定所测得的相应亮度是否与所述目标亮度相等；以及响应于所测得的相应亮度中的至少一个不等于所述目标亮度的确定，根据所测得的相应亮度与所述目标亮度之间的差值，生成所述相应的控制命令。
根据本公开的再另一方面，提供了一种背光源，包括：相互独立的多个分区，所述分区中的每一个包括呈阵列排布且串联的多个发光二极管(LED)；以及如上所述的电路。
根据本公开的再另一方面，提供了一种显示装置，包括如上所述的背光源。
根据在下文中所描述的实施例，本发明的这些和其它方面将是清楚明白的，并且将参考在下文中所描述的实施例而被阐明。
附图说明
附图被提供用于对本公开的进一步理解，构成本公开的一部分。在附图中：
图1为包括具有多个分区的背光源的典型显示装置的示意图；
图2为根据本公开实施例的用于调节背光源的亮度的系统的示意图；
图3A为图2所示的系统中用于背光源的单个分区的亮度调节电路的示意图；
图3B为图3A的电路的变型的示意图；
图3C为图3A的电路的另一变型的示意图；
图4为根据本公开实施例的用于调节背光源的亮度的方法的流程图；并且
图5为图4的方法中生成控制命令的步骤的流程图。
具体实施方式
将理解的是，尽管术语第一、第二、第三等等在本文中可以用来描述各种元件、部件和/或部分，但是这些元件、部件和/或部分不应当由这些术语限制。这些术语仅用来将一个元件、部件或部分与另一个相区分。因此，下面讨论的第一元件、部件或部分可以被称为第二元件、部件或部分而不偏离本公开的教导。
本文中使用的术语仅出于描述特定实施例的目的并且不意图限制本公开。如本文中使用的，单数形式“一个”、“一”和“该”意图也包括复数形式，除非上下文清楚地另有指示。将进一步理解的是，术语“包括”和/或“包含”当在本说明书中使用时指定所述及特征、整体、步骤、操作、元件和/或部件的存在，但不排除一个或多个其他特征、整体、步骤、操作、元件、部件和/或其群组的存在或添加一个或多个其他特征、整体、步骤、操作、元件、部件和/或其群组。如本文中使用的，术语“和/或”包括相关联的列出项目中的一个或多个的任意和全部组合。
将理解的是，当元件被称为“连接到另一个元件”或“耦合到另一个元件”时，其可以直接连接到另一个元件或直接耦合到另一个元件，或者可以存在中间元件。相反，当元件被称为“直接连接到另一个元件”或“直接耦合到另一个元件”时，没有中间元件存在。
除非另有定义，本文中使用的所有术语(包括技术术语和科学术语)具有与本公开所属领域的普通技术人员所通常理解的相同含义。将进一步理解的是，诸如那些在通常使用的字典中定义的之类的术语应当被解释为具有与其在相关领域和/或本说明书上下文中的含义相一致的含义，并且将不在理想化或过于正式的意义上进行解释，除非本文中明确地如此定义。
下面结合附图对本公开的实施例进行详细描述。
背光源不同分区之间的亮度差异可以影响作为整体的背光源的亮度的均匀性，进而影响作为最终产品的显示器的显示效果。鉴于此，本公开提出向背光源的用户(例如，显示器制造商)开放用于调节背 光源的亮度的接口以使得用户能够根据自己的需要修改背光源的原始设置。这有利于消除背光源的出厂缺陷并且提升作为最终产品的显示器的显示质量。
图1为包括具有多个分区的背光源B的典型显示装置100的示意图。如图1所示，显示装置100包括背光源B，其包括多个相互独立的分区B 1、B 2、B 3……B n-2、B n-1、B n，其每一个包括呈阵列排布且串联的多个发光二极管(LED)。这允许所述多个分区B 1、B 2、B 3……B n-2、B n-1、B n的亮度的单独可控的调节。将理解的是，显示装置100可以是并入所示出和描述的背光源B的任何显示器，例如液晶显示器、电子墨水显示器等。然而，为了不模糊本公开的主题，显示装置100的其他细节未被示出。还将理解的是，所示出的各个分区的排列和每个分区所包括的LED的数目是示例性的，并且其他实施例是可能的。
图2为根据本公开实施例的用于调节背光源的亮度的系统200的示意图。如图2所示，系统200包括显示装置210、亮度计220和控制器230。
显示装置210可以采取图1的显示装置100的形式，其包括背光源，该背光源包括所述多个相互独立的分区B 1、B 2、B 3……B n-2、B n-1、B n。分区B 1和B n在图2中被示出。图2的背光源还被提供有用于调节所述分区的亮度的电路，其包括多个LED驱动器211 1……211 n和多个可编程电压生成器212 1……212 n。具体地，分区B 1被提供有LED驱动器211 1和可编程电压生成器212 1，并且分区B n被提供有LED驱动器211 n和可编程电压生成器212 n。所述LED驱动器211 1……211 n被配置成向所述多个分区B 1……B n供应相应的驱动电流I LED1……I LEDn。所述可编程电压生成器212 1……212 n被配置成接收相应的控制命令CMD 1……CMD n并且基于所述相应的控制命令CMD 1……CMD n向所述LED驱动器211 1……211 n供应相应的参考电压VREF 1……VREF n。所述LED驱动器211 1……211 n还被配置成响应于相应的参考电压VREF 1……VREF n而设定相应的驱动电流I LED1……I LEDn的水平。
亮度计220被配置成测量所述多个分区B 1……B n的相应亮度。亮度计220的示例包括商业可用的各种基于电荷耦合器件(CCD)的光学照度计。其他类型的亮度计也是可能的。
控制器230被配置成基于所测得的相应亮度和一目标亮度生成所 述相应的控制命令CMD 1……CMD n。具体地，控制器230接收指示所测得的相应亮度的第一输入IN1和指示所述目标亮度的第二输入IN2。在一些实施例中，控制器230可以经由数据传输接口或者人机交互接口接收第一输入IN。控制器230还可以经由人机交互接口接收由用户键入的第二输入IN2。替换地，第二输入IN可以被预先内建在可由控制器230访问的存储器中。然后，控制器230确定所测得的相应亮度是否与所述目标亮度相等。接下来，响应于所测得的相应亮度中的至少一个不等于所述目标亮度的确定，控制器230根据所测得的相应亮度与所述目标亮度之间的差值，生成用于所述多个可编程电压生成器212 1……212 n的所述相应的控制命令CMD 1……CMD n。所述相应的控制命令CMD 1……CMD n被配置成指示所述可编程电压生成器212 1……212 n调节供应给所述LED驱动器211 1……211 n的所述相应的参考电压VREF 1……VREF n，使得所述多个分区B 1……B n的相应亮度基本上等于所述目标亮度。
将理解的是，如本文中使用的术语“相等”和“基本上相等”不一定意指确切地相同，而是允许一定的容差，例如±5％。术语“控制器”在本文中用来描述与背光源的操作有关的各种不同的装置。控制器230可以以许多方式(例如诸如利用专用硬件)实现以便执行本文讨论的各种不同的功能。“处理器”是采用一个或多个微处理器的控制器230的一个示例，所述微处理器可以使用软件(例如微代码)进行编程以便执行本文讨论的各种不同的功能。控制器230可以在采用或者在不采用处理器的情况下实现，并且也可以实现为执行一些功能的专用硬件和执行其他功能的处理器(例如一个或多个编程的微处理器和关联的电路系统)的组合。可以在本公开的各个不同的实施例中采用的控制器部件的示例包括但不限于常规的微处理器、专用集成电路(ASIC)以及现场可编程门阵列(FPGA)。
在各种不同的实现方式中，控制器230可以与一种或多种存储介质(在本文中统称为“存储器”，例如诸如RAM、PROM、EPROM和EEPROM之类的易失性和非易失性计算机存储器、软盘、致密盘、光盘、磁带等等)关联。在一些实现方式中，存储介质可以利用一个或多个程序进行编码，所述程序在一个或多个处理器上执行时执行本文讨论的功能中的至少一些。各种不同的存储介质可以固定在处理器内， 或者可以是可运输的，使得存储于其上的所述一个或多个程序可以被加载到处理器中以便实现本文讨论的各个不同的方面。术语“程序”或者“计算机程序”在本文中在一般意义上用来指可以被采用以便对一个或多个处理器编程的任何类型的计算机代码(例如软件或微代码)。
在一些实施例中，包括LED驱动器211 1……211 n和可编程电压生成器212 1……212 n的所述电路位于所述背光源本地，例如与背光源的LED集成在一起，并且所述控制器230位于距所述背光源远程处，例如，与显示装置210相分离。在这样的实施例中，所述系统200还包括信号转换器240，其被配置成将所述控制器230生成的所述相应的控制命令CMD 1……CMD n编程到所述可编程电压生成器212 1……212 n中。信号转换器240的示例是编程器。在一些实施例中，控制器230也可以位于背光源或显示装置210本地，在该情况下，信号转换器240是可选的，因为控制命令CMD 1……CMD n可以通过总线被直接编程到所述可编程电压生成器212 1……212 n中。
图3A为图2所示的系统200中用于背光源的单个分区的亮度调节电路的示意图。具体地，LED驱动器211 1和可编程电压生成器212 1被示出在图3A中。
LED驱动器211 1可以是能够根据参考电压VREF 1调节输出电流I LED1的任何商业可用的LED驱动器芯片，例如来自Supertex TM的开关模式LED驱动器芯片HV9911。在图3A的示例中，作为所述LED驱动器211 1的HV9911具有用于输出内部参考电压V con的第一端子和用于接收所述参考电压VREF 1的第二端子，并且HV9911的输出电流I LED1与参考电压VREF 1成正比。关于HV9911的更多信息可以在 www.supertex.com中找到。
可编程电压生成器212 1被用于为LED驱动器211 1提供可变的参考电压VREF 1。在图3A的示例中，可编程电压生成器212 1包括经由HV9911的所述第二端子串联在HV9911的所述第一端子与一接地端子之间的电阻器R con和数字电位器R var。具体地，所述电阻器R con连接在所述第一端子与所述第二端子之间，并且所述数字电位器R var连接在所述第二端子与所述接地端子之间。所述数字电位器212 1被配置成通过响应于接收的所述控制命令CMD 1改变该数字电位器212 1的电阻而 设定所述参考电压VREF 1。在该示例中，参考电压VREF 1可以表示为VREF 1＝(R var/(R con+R var))V con。借助于LED驱动器211 1，供应给背光源的分区B 1的驱动电流I LED1将响应于控制命令CMD 1而被改变。
图3B为图3A的电路的变型的示意图。图3B的电路类似于图3A的电路，只不过电阻器R con和数字电位器R var现在被调换。如图3B所示，所述数字电位器R var连接在HV9911的所述第一端子与所述第二端子之间，并且所述电阻器R con连接在HV9911的所述第二端子与所述接地端子之间。在该示例中，参考电压VREF 1可以表示为VREF 1＝(R con/(R con+R var))V con。借助于LED驱动器211 1，供应给背光源的分区B 1的驱动电流I LED1将响应于控制命令CMD 1而被改变。
图3C为图3A的电路的另一变型的示意图。在图3C的示例中，LED驱动器211 1可以采取与图3A相同的形式，并且可编程电压生成器212 1为可编程的电压源U var。在这种情况下，电压源U var可以响应于控制命令CMD 1而直接为LED驱动器211 1提供参考电压VREF 1。一个或多个电压源U var可以由商业可用的电压生成器芯片来实现，例如来自intersil TM的多通道可编程电压生成器芯片ISL24853A。关于ISL24853A的更多信息可以在 www.intersil.com中找到。
图4为根据本公开实施例的用于调节背光源的亮度的方法400的流程图。方法400可以由上面关于图2所描述的系统200来实现，所述系统中所述背光源包括相互独立的多个分区B 1……B n，所述分区中的每一个包括呈阵列排布且串联的多个LED。
在步骤410处，测量所述背光源的所述多个分区的相应亮度。这可以由图2的亮度计220来执行。
在步骤420处，基于所测得的相应亮度和一目标亮度生成相应的控制命令。这可以由图2的控制器230来执行。在图2的示例中，所述控制命令CMD 1……CMD n被配置成指示所述可编程电压生成器212 1……212 n调节供应给所述LED驱动器211 1……211 n的所述相应的参考电压VREF 1……VREF n，使得所述分区B 1……B n的相应亮度基本上等于所述目标亮度。
在步骤430处，根据所述相应的控制命令调节供应给所述多个分区中的至少一个分区的所述多个LED的驱动电流，使得所述多个分区的相应亮度基本上等于所述目标亮度。如上所述，这可以由图2的可编 程电压生成器212 1……212 n和LED驱动器211 1……211 n来执行。
将理解的是，在实践中，在所述多个分区的相应亮度基本上等于所述目标亮度之前，步骤410-430可能需要被反复地执行。
图5为图4的方法400中的步骤420的流程图。在步骤422处，接收指示所测得的相应亮度的第一输入和指示所述目标亮度的第二输入。在图2的示例中，控制器230可以经由通用串行总线(USB)接口、无线或有线网络接口之类的数据传输接口从亮度计220接收所测得的亮度数据。替换地或附加地，控制器230可以经由诸如键盘、触摸屏之类的人机交互接口接收由用户键入的亮度数据。控制器230还可以接收指示所述目标亮度的亮度数据。在步骤424处，确定所测得的相应亮度是否与所述目标亮度相等。在步骤426处，响应于所测得的相应亮度中的至少一个不等于所述目标亮度的确定，根据所测得的相应亮度与所述目标亮度之间的差值，生成所述相应的控制命令。
以上所述为本公开的具体实施方式，但本公开的保护范围并不局限于此。对所公开的实施例的变型或修改可以由本领域的技术人员做出而不脱离本公开的范围。因此，本公开的保护范围应以所附的权利要求为准。

Claims (17)

  1. 一种用于调节背光源的亮度的电路，所述背光源包括相互独立的多个分区，所述分区中的每一个包括呈阵列排布且串联的多个发光二极管(LED)，所述电路包括：
    多个LED驱动器，每个LED驱动器被配置成向所述多个分区中的相应一个分区的所述多个LED供应一相应的驱动电流；以及
    多个可编程电压生成器，被配置成接收相应的控制命令并且基于所述相应的控制命令向所述多个LED驱动器供应相应的参考电压，
    其中所述LED驱动器中的每一个还被配置成响应于供应给该LED驱动器的所述参考电压而设定由该LED驱动器供应的所述驱动电流的水平。
  2. 根据权利要求1所述的电路，其中所述LED驱动器中的每一个具有用于输出内部参考电压的第一端子和用于接收供应给该LED驱动器的所述参考电压的第二端子，其中所述可编程电压生成器中的每一个包括经由所述第二端子串联在所述第一端子与一接地端子之间的电阻器和数字电位器，并且其中所述数字电位器被配置成通过响应于由该可编程电压生成器接收的所述控制命令改变该数字电位器的电阻而设定由该可编程电压生成器供应的所述参考电压。
  3. 根据权利要求2所述的电路，其中所述电阻器连接在所述第一端子与所述第二端子之间，并且其中所述数字电位器连接在所述第二端子与所述接地端子之间。
  4. 根据权利要求2所述的电路，其中所述数字电位器连接在所述第一端子与所述第二端子之间，并且其中所述电阻器连接在所述第二端子与所述接地端子之间。
  5. 根据权利要求1所述的电路，其中所述多个可编程电压生成器包括至少一个可编程电压源，其被配置成响应于所述相应的控制命令生成所述相应的参考电压。
  6. 一种用于调节背光源的亮度的系统，所述背光源包括相互独立的多个分区，所述分区中的每一个包括呈阵列排布且串联的多个发光二极管(LED)，所述系统包括：
    亮度计，被配置成测量所述背光源的所述多个分区的相应亮度；
    控制器，被配置成基于所测得的相应亮度和一目标亮度生成相应的控制命令；以及
    电路，包括：
    多个LED驱动器，每个LED驱动器被配置成向所述多个分区中的相应一个分区的所述多个LED供应一相应的驱动电流；以及
    多个可编程电压生成器，被配置成接收所述相应的控制命令并且基于所述相应的控制命令向所述多个LED驱动器供应相应的参考电压，
    其中所述LED驱动器中的每一个还被配置成响应于供应给该LED驱动器的所述参考电压而设定由该LED驱动器供应的所述驱动电流的水平。
  7. 根据权利要求6所述的系统，其中所述控制器还被配置成：
    接收指示所测得的相应亮度的第一输入和指示所述目标亮度的第二输入；
    确定所测得的相应亮度是否与所述目标亮度相同；以及
    响应于所测得的相应亮度中的至少一个不同于所述目标亮度的确定，根据所测得的相应亮度与所述目标亮度之间的差值，生成用于所述多个可编程电压生成器的所述相应的控制命令，所述相应的控制命令被配置成指示所述多个可编程电压生成器调节供应给所述多个LED驱动器的所述相应的参考电压，使得所述多个分区的相应亮度基本上等于所述目标亮度。
  8. 根据权利要求6所述的系统，其中所述电路位于所述背光源本地，其中所述控制器位于距所述背光源远程处，并且其中所述系统还包括信号转换器，其被配置成将所述控制器生成的所述相应的控制命令编程到所述多个可编程电压生成器中。
  9. 根据权利要求6所述的系统，其中所述LED驱动器中的每一个具有用于输出内部参考电压的第一端子和用于接收供应给该LED驱动器的所述参考电压的第二端子，其中所述可编程电压生成器中的每一个包括经由所述第二端子串联在所述第一端子与一接地端子之间的电阻器和数字电位器，并且其中所述数字电位器被配置成通过响应于由该可编程电压生成器接收的所述控制命令改变该数字电位器的电阻而设定由该可编程电压生成器供应的所述参考电压。
  10. 根据权利要求7所述的系统，其中所述电阻器连接在所述第一端子与所述第二端子之间，并且其中所述数字电位器连接在所述第二端子与所述接地端子之间。
  11. 根据权利要求7所述的系统，其中所述数字电位器连接在所述第一端子与所述第二端子之间，并且其中所述电阻器连接在所述第二端子与所述接地端子之间。
  12. 根据权利要求6所述的系统，其中所述多个可编程电压生成器包括至少一个可编程电压源，其被配置成响应于所述相应的控制命令生成所述相应的参考电压。
  13. 根据权利要求6所述的系统，其中所述亮度计包括基于电荷耦合器件(CCD)的光学照度计。
  14. 一种用于调节背光源的亮度的方法，所述背光源包括相互独立的多个分区，所述分区中的每一个包括呈阵列排布且串联的多个发光二极管(LED)，所述方法包括：
    测量所述背光源的所述多个分区的相应亮度；
    基于所测得的相应亮度和一目标亮度生成相应的控制命令；以及
    根据所述相应的控制命令调节供应给所述多个分区中的至少一个分区的所述多个LED的驱动电流，使得所述多个分区的相应亮度基本上等于所述目标亮度。
  15. 根据权利要求14所述的方法，其中所述生成所述相应的控制命令包括：
    接收指示所测得的相应亮度的第一输入和指示所述目标亮度的第二输入；
    确定所测得的相应亮度是否与所述目标亮度相等；以及
    响应于所测得的相应亮度中的至少一个不等于所述目标亮度的确定，根据所测得的相应亮度与所述目标亮度之间的差值，生成所述相应的控制命令。
  16. 一种背光源，包括：
    相互独立的多个分区，所述分区中的每一个包括呈阵列排布且串联的多个发光二极管(LED)；以及
    如权利要求1-5中任一项所述的电路。
  17. 一种显示装置，包括如权利要求16所述的背光源。
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