WO2018205629A1 - 背光亮度控制方法及装置 - Google Patents

背光亮度控制方法及装置 Download PDF

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Publication number
WO2018205629A1
WO2018205629A1 PCT/CN2017/117481 CN2017117481W WO2018205629A1 WO 2018205629 A1 WO2018205629 A1 WO 2018205629A1 CN 2017117481 W CN2017117481 W CN 2017117481W WO 2018205629 A1 WO2018205629 A1 WO 2018205629A1
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WIPO (PCT)
Prior art keywords
brightness
backlight
value
display panel
module
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Application number
PCT/CN2017/117481
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English (en)
French (fr)
Inventor
殷新社
冈村政和
Original Assignee
京东方科技集团股份有限公司
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.)
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US16/076,436 priority Critical patent/US10706791B2/en
Publication of WO2018205629A1 publication Critical patent/WO2018205629A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • 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
    • G09G2380/00—Specific applications
    • G09G2380/08—Biomedical applications

Definitions

  • Embodiments of the present disclosure relate to a backlight brightness control method and a backlight brightness control device.
  • medical imaging diagnostics have been converted from traditional hard reading films, such as film to soft reading, such as medical displays.
  • DR, CR, CT, and 3D images and images are displayed on a medical display and then diagnosed.
  • Consistency means that the display quality (brightness, grayscale, contrast, etc.) of the medical display needs to be consistent for the same image when the medical display is used for different times.
  • integrity means that the display quality (brightness, grayscale, contrast, etc.) of the same image displayed on the medical display of the workstation at different locations is exactly the same to ensure that the images seen by doctors in different locations are the same.
  • Embodiments of the present disclosure provide a backlight brightness control method and a backlight brightness control device.
  • the backlight brightness control method includes: obtaining a light output brightness value of the display panel; the brightness control circuit determines a magnitude relationship between the light output brightness value and the preset brightness value; the brightness control circuit calculates a current value to be adjusted according to the size relationship, and Transmitting the adjusted current value to the backlight driving module; and the backlight driving module generates a current having the adjusted current value to drive the backlight module in the display panel to emit light.
  • the backlight brightness control method firstly determines the relationship between the brightness value of the light emitted by the display panel and the preset brightness value, and then adjusts the brightness of the backlight module by adjusting the magnitude of the current, thereby achieving stability of the backlight brightness. control.
  • At least one embodiment of the present disclosure provides a backlight brightness control method, including: acquiring a display surface a brightness value of the brightness of the board; the brightness control circuit determines a magnitude relationship between the brightness value of the light output and a preset brightness value; the brightness control circuit calculates a current value to be adjusted according to the size relationship, and transmits the adjusted current value to the backlight driving module a current value; and the backlight driving module generates a current having the adjusted current value to drive the backlight module in the display panel to emit light.
  • the backlight brightness control method provided by an embodiment of the present disclosure further includes: the brightness control circuit transmits a duty value to the backlight driving module; and the backlight driving module controls the having the The duty cycle of the current of the adjusted current value.
  • the duty ratio is 100%.
  • the backlight brightness control method provided by an embodiment of the present disclosure further includes: the brightness control circuit transmitting an initial current value to the backlight driving module before acquiring the light output brightness value of the display panel.
  • the brightness control circuit transmits the adjusted current value to the backlight driving module according to the magnitude relationship: if the light output brightness value is greater than the preset brightness a value, the brightness control circuit subtracting a current change value from the initial current value to obtain the adjusted current value and transmitting the adjusted current value to the backlight driving module, if The brightness brightness value is less than the preset brightness value, and the brightness control circuit adds a current change value to the initial current value to obtain the adjusted current value and transmits the adjusted current value to the backlight driving module.
  • the adjusted current value is adjusted according to the relationship between the light output brightness value and the preset brightness value, so that the light output brightness of the display panel reaches the preset brightness value.
  • the obtaining the brightness value of the light output of the display panel includes: setting the brightness sensor on the light emitting side of the backlight module or the light emitting side of the display module in the display panel. And outputting a brightness sensing signal; and acquiring an output brightness value of the display panel according to the brightness sensing signal.
  • the obtaining the brightness value of the light output of the display module further includes: setting a standard brightness tester on the light exiting side of the display panel and measuring the light output brightness of the display panel.
  • adjusting the display panel to change the brightness of the light; obtaining a plurality of light-emitting brightness values of different light-emitting brightness measured by the standard brightness tester; and acquiring a plurality of brightness sensings of the different light-emitting brightness sensed by the brightness sensor a signal; establishing a correspondence between the plurality of light-emitting luminance values and the plurality of brightness sensing signals; and determining a light-emitting luminance value of the display panel according to the brightness sensing signal output by the brightness sensor and the corresponding relationship.
  • the plurality of light output brightness values include the preset brightness value
  • the brightness control circuit determines that the size relationship between the light output brightness value and the preset brightness value includes: Determining, according to the preset brightness value and the corresponding relationship, a brightness sensing signal corresponding to the preset brightness value; and comparing a brightness sensing signal output by the brightness sensor with a brightness sensing corresponding to the preset brightness value The size relationship of the signal.
  • the preset brightness value is smaller than a maximum brightness value of the display panel.
  • At least one embodiment of the present disclosure provides a backlight brightness control apparatus including: a brightness sensor configured to acquire a brightness sensing signal of a display panel; a brightness control circuit communicatively coupled to the brightness sensor; and a backlight driving module, and The brightness control circuit is connected in communication and electrically connected to the backlight module for the display module, and the brightness control circuit is configured to acquire the brightness value of the light output of the display panel according to the brightness sensing signal, and determine a relationship between the brightness value of the light emission and a preset brightness value, and transmitting an adjusted current value to the backlight driving module according to the magnitude relationship, wherein the backlight driving module generates a current having the adjusted current value to drive the current The backlight module in the display panel emits light.
  • the brightness sensor is disposed on a light emitting side of a backlight module in the display panel or a light emitting side of a display module in the display panel.
  • the brightness control circuit is further configured to transmit a duty value to the backlight driving module, and the backlight driving module is configured to be according to the duty value Controlling a duty cycle of the current having the adjusted current value.
  • the duty ratio value includes 100%.
  • the backlight driving module includes: a driving power source configured to generate a driving voltage and adjust a current for driving the backlight module by adjusting the driving voltage;
  • the current feedback circuit includes a feedback resistor connected in series with the backlight module, and the current feedback circuit is configured to feedback a current for driving the backlight module according to a feedback voltage feedback on the feedback resistor.
  • the backlight driving module further includes: a current limiting resistor; and a digital potentiometer communicatively coupled to the brightness control circuit and configured to adjust the The current value is converted into a resistor, and one end of the current limiting resistor is connected to a standard reference power Pressing, the other end is connected to the digital potentiometer to generate an adjustment voltage at an end of the digital potentiometer connected to the current limiting resistor when the digital potentiometer is input with the adjusted current value,
  • the driving power source is configured to compare the feedback voltage and the adjustment voltage value and adjust the driving voltage according to a comparison result.
  • the backlight driving module further includes: a power interface configured to be connected to the input power; and a PWM interface configured to be connected to the PWM bus, the input A power supply is configured to provide power to the backlight drive module, the PWM bus configured to transmit a duty cycle value transmitted by the brightness control circuit to the backlight drive module.
  • a display device including: a display panel including a display module and a backlight module; and a backlight brightness control device, wherein the backlight brightness control device includes the backlight brightness control according to any one of the above Device.
  • 1 is a graph showing the brightness of a display device as a function of boot time
  • FIG. 2 is a graph showing the brightness of a display device as a function of time of use
  • Figure 3 is a graph showing the brightness of a display device as a function of ambient temperature
  • FIG. 4 is a schematic diagram of a backlight brightness control device
  • FIG. 5 is a flowchart of a backlight brightness control method according to an embodiment of the present disclosure
  • FIG. 6 is a graph showing changes in brightness of a display device according to a backlight brightness control method according to an embodiment of the present disclosure
  • FIG. 7 is a graph showing changes in brightness of a display device according to a backlight brightness control method according to an embodiment of the present disclosure
  • FIG. 8 is a graph showing changes in brightness of a display device according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of obtaining a light output brightness value of a display panel according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of another backlight brightness control apparatus according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic diagram of another backlight brightness control apparatus according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic diagram of a backlight driving module according to an embodiment of the present disclosure.
  • Figure 1 shows a graph of the brightness of a display device as a function of turn-on time.
  • the driving elements in the backlight module and the light-emitting elements such as LEDs
  • the brightness of the backlight generated by the backlight module cannot be Achieving stable brightness usually takes half an hour to an hour to reach a stable brightness. Therefore, the usual display device has a low brightness within half an hour to one hour after power-on.
  • Fig. 2 is a graph showing the variation of the brightness of a display device with time of use. As shown in FIG.
  • FIG. 3 is a graph showing the brightness of a display device as a function of ambient temperature. As shown in FIG. 3, when the ambient temperature changes, the brightness of the backlight generated by the backlight module also changes. Therefore, in order to make the medical display meet the requirements of consistency and integrity of display quality, it is necessary to stably control the brightness of the medical display.
  • the backlight brightness control device includes a brightness sensor 10, a brightness control circuit 20, and a backlight driving module 30.
  • the brightness sensor 10 is configured to acquire the brightness sensing signal of the display panel 200.
  • the brightness control circuit 20 obtains the brightness value of the light output of the display panel 200 according to the brightness sensing signal, determines the relationship between the brightness value and the preset brightness value, and then passes the pulse width.
  • Modulation (PWM) adjustment backlight driving module 30 drives display panel 200
  • the duty ratio of the current of the backlight module 220 is such that the brightness of the backlight is controlled.
  • the backlight driving module needs to set the current of the backlight module in the driving display panel to a maximum value, thereby causing the backlight module to always drive under the maximum current, thereby reducing the backlight module. Reliability and longevity.
  • Embodiments of the present disclosure provide a backlight brightness control method and a backlight brightness control device.
  • the backlight brightness control method includes: obtaining a light output brightness value of the display panel; the brightness control circuit determines a magnitude relationship between the light output brightness value and the preset brightness value; the brightness control circuit calculates a current value to be adjusted according to the size relationship, and Transmitting the adjusted current value to the backlight driving module; and the backlight driving module generates a current having the adjusted current value to drive the backlight module in the display panel to emit light.
  • the backlight brightness control method firstly determines the relationship between the brightness value of the light emitted by the display panel and the preset brightness value, and then adjusts the brightness of the backlight module by adjusting the magnitude of the current, thereby achieving stability of the backlight brightness. control.
  • FIG. 5 shows a flow chart of a backlight brightness control method according to the present embodiment. As shown in FIG. 5, the backlight brightness control method includes the following steps S101-S104.
  • Step S101 Acquire an output brightness value of the display panel.
  • the brightness value of the display panel is obtained by the brightness sensor.
  • Step S102 The brightness control circuit determines the magnitude relationship between the brightness value of the light output of the display panel and the preset brightness value.
  • Step S103 The brightness control circuit calculates the current value to be adjusted according to the relationship between the brightness value of the light output of the display panel and the preset brightness value, and transmits the adjusted current value to the backlight driving module.
  • the adjusted current value can be obtained by subtracting a change value from the current current value of the backlight module; when the light output brightness value is less than the preset brightness value, The current value of the backlight module is added with a change value to obtain an adjusted current value.
  • Step S104 The backlight driving module generates a current having an adjusted current value to drive the backlight module in the display panel to emit light.
  • the preset brightness value is a value set according to actual requirements, and is also a target brightness value to be achieved by the backlight brightness control method provided in this embodiment.
  • the brightness control circuit can include a processor and a memory, and the memory is stored to implement the above steps Program, the processor can execute a program stored in the memory. It should be noted that the embodiments of the present disclosure include but are not limited thereto, and the brightness control circuit may also be a circuit that can implement the above-mentioned judgment function.
  • FIG. 6 is a graph showing the brightness of the display device according to the backlight brightness control method provided by the embodiment according to the boot time, as shown in FIG.
  • FIG. 7 is a graph showing the variation of the brightness of the display device according to the backlight brightness control method provided by the embodiment with the use time. As shown in FIG.
  • FIG. 8 is a graph showing changes in brightness of a display device according to the backlight brightness control method provided by the present embodiment as a function of ambient temperature. As shown in FIG. 8 , the current driving the backlight module can be increased or decreased by the above method, so that the backlight brightness generated by the backlight module is kept stable, thereby achieving stable control of the backlight brightness.
  • the preset brightness value is smaller than the maximum brightness value of the display panel.
  • the backlight brightness control when the backlight brightness control is performed by adjusting the ratio of the current driving the backlight module, the maximum current is required to drive the light-emitting elements (such as LEDs) in the backlight module of the display panel;
  • the backlight brightness control method provided by the embodiment performs the backlight brightness control, and the current of the light-emitting element (for example, LED) in the backlight module of the display panel is small, avoiding long-term high-current driving, thereby improving the reliability of the light-emitting element (such as LED). And stability.
  • the preset brightness value can be set within a range of 50% to 75% of the maximum brightness value of the display panel, thereby ensuring sufficient brightness on the one hand and keeping the brightness stable throughout the life cycle of the display device on the other hand.
  • the current value required for the display panel to reach the preset brightness value may be a lower current value, thereby illuminating with the backlight module. The aging of components and the like, the luminous efficiency is lowered, and the current of the driving backlight module is gradually increased when the brightness is lowered.
  • the components of the backlight module such as the light-emitting elements (such as LEDs) do not need to operate at the maximum current for a long time, thereby ensuring the operation. Reliability of devices such as light-emitting elements (such as LEDs) of a backlight module.
  • the backlight brightness control method provided in this example may further include: the brightness control circuit transmits a duty value to the backlight driving module; and the backlight driving module controls the duty ratio of the current having the adjusted current value according to the duty value.
  • the backlight brightness control method provided by the present embodiment also provides a way to adjust the brightness of the backlight by adjusting the duty ratio of the current having the adjusted current value. That is to say, the backlight brightness control method provided in this embodiment can stably control the brightness of the backlight, and can also adjust the brightness of the backlight.
  • the backlight brightness control method provided in this embodiment can not only stably control the brightness of the backlight, but also ensure the medical image or image displayed by the display device. Consistency and integrity of (for example, DR, CR, CT, and 3D images or images); when the display device using the backlight brightness control method provided by the embodiment is used for other conventional purposes, the user can pass the implementation according to his or her preference.
  • the backlight brightness control method provided by the example adjusts the brightness.
  • the above-mentioned space-to-occupancy ratio is 100%, thereby ensuring medical images or images displayed by the display panel (for example, DR, CR). Consistency and integrity of CT, CT and 3D images or images.
  • the display panel is used for medical diagnosis
  • the gamma curve of the displayed screen is applied to the DICOM standard; in this case, the empty ratio is required to be 100%, and the contrast is also 100%.
  • the backlight brightness control method provided by the embodiment can ensure that the medical display displays maximum brightness under 255 gray scales, and other gray scales satisfy the DICOM standard. It is worth noting that when the display panel is used for medical diagnosis, the user cannot adjust the brightness, contrast and duty cycle to ensure consistency and integrity of medical images or images such as DR, CR, CT and 3D images or images. .
  • the backlight brightness control method provided by the example of the embodiment further includes: the brightness control circuit transmits an initial current value to the backlight driving module before acquiring the light output brightness value of the display panel.
  • the above initial current value can be set according to actual conditions.
  • the initial current value may be determined by a technical parameter of the light-emitting element in the backlight module, or the initial current value may be set to a current value determined by a test to reach a preset brightness value (according to the use of the display panel and Aging, the current value that reaches the preset brightness value will change).
  • the brightness control circuit transmits the adjusted to the backlight driving module according to the relationship between the brightness value of the light output of the display panel and the preset brightness value.
  • the current value may include: if the brightness value of the light is greater than the preset brightness value, the brightness control circuit subtracts a current change value from the initial current value to obtain the adjusted current value and transmits the adjusted current value to the backlight driving module.
  • the brightness control circuit adds a current change value to the initial current value to obtain the adjusted current value and transmits the adjusted current value to the backlight driving module; the adjusted current The value is adjusted according to the relationship between the brightness value of the light and the preset brightness value (for example, multiple adjustments), so that the brightness of the light emitted by the display panel reaches a preset brightness value.
  • the obtaining the brightness value of the display panel includes: setting the brightness sensor on the light emitting side of the backlight module in the display panel or the light emitting side of the display module in the display panel; And outputting a brightness sensing signal; and acquiring a light output brightness value of the display panel according to the brightness sensing signal.
  • the light-emitting luminance value of the display panel is obtained by a brightness sensor provided on the light-emitting side of the backlight module or the light-emitting side of the display module.
  • the brightness of the light output of the display panel is equal to the brightness of the light-emitting side of the display module. If the brightness sensor is disposed on the light-emitting side of the backlight module, the backlight mode is The brightness of the light exiting side of the group is several to several tens of times the brightness of the light output of the display panel.
  • the obtaining the brightness value of the light output of the display module further includes: setting the standard brightness tester 500 on the light exit side of the display module 210 and measuring as shown in FIG.
  • the brightness value of the display panel 200 is adjusted; the display panel is adjusted to change the brightness of the light; the plurality of light-emitting brightness values measured by the standard brightness tester 500 are obtained; and the plurality of brightnesses of the different light-emitting brightness sensed by the brightness sensor 110 are acquired.
  • the brightness sensing signal and the corresponding relationship of the brightness sensor output can be established by the brightness value of the light output of the display panel measured by the standard brightness tester under different light brightness and the brightness sensing signal measured by the brightness sensor;
  • the brightness sensor can be calibrated by a standard brightness tester.
  • Table 1 is a table of correspondence between a plurality of light-emitting luminance values and a plurality of luminance sensing signals.
  • the plurality of brightness sensing signals may be hexadecimal digital signals, such as A5, AA, AE; the correspondence between the plurality of brightness values and the plurality of brightness sensing signals in Table 1
  • the brightness sensing signal sensed by the brightness sensor is A5
  • the brightness value of the light output of the display panel is 490 nit
  • the brightness sensing signal sensed by the brightness sensor is AA, the brightness value of the light output of the display panel at this time.
  • the brightness sensing signal sensed by the brightness sensor is AE
  • the brightness value of the light output of the display panel is 510 nit.
  • the pair of light-emitting brightness values shown in Table 1 and the pair of brightness sensing signals The relationship table only exemplarily illustrates the correspondence relationship between the plurality of light-emitting luminance values and the plurality of luminance sensing signals, and the embodiments of the present disclosure include but are not limited thereto.
  • the plurality of light exiting brightness values include a preset brightness value.
  • the step of determining, by the brightness control circuit, the relationship between the brightness value and the preset brightness value comprises: determining a brightness sensing signal corresponding to the preset brightness value according to the preset brightness value and the corresponding relationship, for example, when the preset brightness value is 500 nit, according to
  • the correspondence table between the plurality of light-emitting brightness values and the plurality of brightness sensing signals shown in Table 1 can determine that the brightness sensing signal (hexadecimal) corresponding to the preset brightness value is AA; and the brightness sensing of the brightness sensor output is compared.
  • the magnitude relationship between the signal and the brightness sensing signal corresponding to the preset brightness value For example, when the brightness sensing signal output by the brightness sensor is A5, A5 is smaller than AA, that is, the light output brightness value is less than the preset brightness value; the brightness sensor output is When the brightness sensing signal is AA, AA is equal to AA, that is, the light output brightness value is equal to the preset brightness value; when the brightness sensing signal outputted by the brightness sensor is AE, AE is greater than AA, that is, the light output brightness value is greater than Preset brightness value.
  • FIG. 10 shows a backlight brightness control device according to the present embodiment.
  • the backlight brightness control device includes a brightness sensor 110, a brightness control circuit 120, and a backlight driving module 130.
  • the brightness sensor 110 is used to acquire the brightness sensing signal of the display panel 200;
  • the brightness control circuit 120 is communicatively coupled to the brightness sensor 110;
  • the backlight driving module 130 is communicatively coupled to the brightness control circuit 120 and electrically connected to the backlight module 220 of the display panel 200.
  • the brightness control circuit 120 acquires the light output brightness value of the display panel 200 according to the brightness sensing signal, determines the magnitude relationship between the light brightness value and the preset brightness value, and transmits the light brightness value to the backlight driving module according to the magnitude relationship between the light output brightness value and the preset brightness value.
  • the adjusted current value, the backlight driving module generates a current having an adjusted current value to drive the backlight module 220 in the display panel 200 to emit light.
  • the backlight control module first determines the relationship between the brightness value of the light emitted by the display panel and the preset brightness value, and then adjusts the brightness of the backlight module by adjusting the current. To achieve stable control of backlight brightness.
  • the preset brightness value is smaller than the display brightness.
  • the maximum brightness value of the display panel is provided in the example of the embodiment.
  • the backlight brightness control is performed by adjusting the ratio of the current driving the backlight module, the maximum current is required to drive the light-emitting elements (such as LEDs) in the backlight module of the display panel;
  • the backlight brightness control device provided by the embodiment performs backlight brightness control, the current of the light-emitting element (for example, LED) in the backlight module of the display panel is small, and long-term high-current driving is avoided, thereby improving the reliability of the light-emitting element (for example, LED). And stability.
  • the brightness control circuit 120 is connected to the brightness sensor 110 via an I2C bus.
  • I2C is an integrated circuit (Inter-Integrated Circuit), which is a data exchange serial data interface line between two chips, so that a small amount of digital data signals can be transmitted between two chips in both directions.
  • the backlight driving module 130 is connected to the brightness control circuit 120 via an I2C bus.
  • the brightness sensor is disposed on the light emitting side of the backlight module in the display panel or the light emitting side of the display module in the display panel, and the embodiment of the present disclosure is not limited herein.
  • FIG. 11 shows another backlight brightness control device according to the present embodiment.
  • the brightness control circuit may further transmit a duty value to the backlight driving module, and the backlight driving module is configured to control the adjusted current according to the duty value.
  • the duty cycle of the value of the current is configured to control the adjusted current according to the duty value.
  • the backlight brightness control apparatus provided in the present embodiment also provides a way to adjust the brightness of the backlight by adjusting the duty ratio of the current having the adjusted current value. That is to say, the backlight brightness control device provided in this embodiment can not only stably control the brightness of the backlight, but also adjust the brightness of the backlight.
  • the backlight brightness control device provided in this embodiment can stably control the brightness of the backlight to ensure the medical image or image displayed by the display device ( For example, the consistency and integrity of the DR, CR, CT, and 3D images or images; when the display device using the backlight brightness control device provided in this embodiment is used for other conventional purposes, the user can pass the embodiment according to his or her preference.
  • the backlight brightness control method is provided to adjust the brightness.
  • the backlight driving module 130 and the brightness control circuit 120 are also connected by PWM (Pulse Width Modulation) bus communication.
  • PWM Pulse Width Modulation
  • the duty ratio value is 100%, thereby ensuring consistency of medical images or images (such as DR, CR, CT, and 3D images or images) displayed on the display panel. And integrity.
  • FIG. 12 shows a schematic diagram of a backlight driving module according to the present embodiment.
  • the backlight driving module 130 includes a driving power source 131 and a current feedback circuit 132.
  • the driving power source 131 generates a driving voltage and adjusts the driving voltage to adjust the current for driving the backlight module 220;
  • the current feedback circuit 132 includes a feedback resistor 1320 connected in series with the backlight module 220, and the current feedback circuit 132 can be based on the feedback on the feedback resistor 1320.
  • the voltage VFDB feeds back the current that drives the backlight module 220 to emit light. Thereby, the driving current on the backlight module 220 can be monitored by the feedback voltage VFDB.
  • the backlight driving module 130 further includes a current limiting resistor 133 and a digital potentiometer 134.
  • the digital potentiometer 134 is communicatively coupled to a brightness control circuit (not shown) and can convert the adjusted current value into a resistor.
  • One end of the current limiting resistor 133 is coupled to a standard reference voltage Vref and the other end is coupled to the digital potentiometer 134.
  • the adjustment voltage Vad is generated at one end of the digital potentiometer 134 connected to the current limiting resistor 133, and the driving power source 131 can compare the feedback voltage VFDB and the adjustment voltage Vad and adjust the driving voltage according to the comparison result. . For example, if the feedback voltage VFDB is greater than the adjustment voltage Vad, the driving current of the backlight module 220 is greater than the adjusted current, and the driving power source 131 reduces the driving voltage; if the feedback voltage VFDB is smaller than the adjustment voltage Vad, the driving current of the backlight module 220 is illustrated. Less than the adjusted current, the driving power source 131 increases the driving voltage.
  • the backlight driving module 130 further includes: a power interface 135 and a PWM interface 136, which are respectively connected to the input power source 300 and the PWM bus.
  • the input power supply provides power to the drive module, and the PWM bus is used to transmit the duty cycle value of the brightness control circuit to the backlight drive module.
  • the input power can be 24V or 48V.
  • the driving power supply can be a boost circuit, that is, the voltage required to boost the 24V to 48V to the backlight module, such as 65V.
  • the backlight module may be an LED backlight module.
  • embodiments of the present disclosure include but are not limited thereto.
  • the display module may be a liquid crystal display panel.
  • embodiments of the present disclosure include but are not limited thereto.
  • An embodiment of the present disclosure provides a display device including a display panel including a display module and a backlight module, and a backlight brightness control device.
  • the backlight brightness control device can be the backlight brightness control described in any of the second embodiment. Device. Thereby, the display device can stably control the brightness of the backlight, thereby being usable for medical diagnosis.

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Abstract

一种背光亮度控制方法以及背光亮度控制装置。背光亮度控制方法包括获取显示面板(200)的出光亮度值(S101)；亮度控制电路(20、120)判断出光亮度值与预设亮度值的大小关系(S102)；亮度控制电路(20、120)根据大小关系向背光驱动模块(30、130)传输调整后的电流值(S103)；以及背光驱动模块(30、130)产生具有调整后的电流值的电流以驱动显示面板(200)中的背光模组(220)发光(S104)。由此，该背光亮度控制方法先通过判断显示面板(200)的出光亮度值与预设的亮度值的大小关系，然后通过调整电流的大小来调整背光模组(220)的发光亮度，从而实现对背光亮度的稳定控制。

Description

背光亮度控制方法及装置
交叉引用
本申请要求于2017年05月12日递交的中国专利申请第201710333211.0号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开的实施例涉及一种背光亮度控制方法和背光亮度控制装置。
背景技术
随着医疗显示技术的发展，医疗影像诊断由传统的硬读片，例如胶片转为软读片，例如医疗显示器。通过医疗显示器来显示DR、CR、CT以及3D图像以及影像，然后进行诊断。
除了高亮度、高对比度、高分辨率、大尺寸、高灰阶等要求外，医疗显示器必须满足显示质量的一致性和整体性的要求。一致性是指当医疗显示器在使用不同的时间后，针对同一图像，医疗显示器的显示质量(亮度、灰度和对比度等)需要保持一致。另外，整体性指在不同地点的工作站的医疗显示器显示的同一图像的显示质量(亮度、灰度、对比度等)是完全一样的，以保证不同地点的医生所看到的图像都是一样的。
发明内容
本公开实施例提供一种背光亮度控制方法以及背光亮度控制装置。该背光亮度控制方法包括获取显示面板的出光亮度值；亮度控制电路判断所述出光亮度值与预设亮度值的大小关系；所述亮度控制电路根据所述大小关系计算需调整的电流值，并向背光驱动模块传输调整后的电流值；以及所述背光驱动模块产生具有所述调整后的电流值的电流以驱动所述显示面板中的背光模组发光。由此，该背光亮度控制方法先通过判断显示面板的出光亮度值与预设的亮度值的小大关系，然后通过调整电流的大小来调整背光模组的发光亮度，从而实现对背光亮度的稳定控制。
本公开至少一个实施例提供一种背光亮度控制方法，其包括：获取显示面 板的出光亮度值；亮度控制电路判断所述出光亮度值与预设亮度值的大小关系；所述亮度控制电路根据所述大小关系计算需调整的电流值，并向背光驱动模块传输调整后的电流值；以及所述背光驱动模块产生具有所述调整后的电流值的电流以驱动所述显示面板中的背光模组发光。
例如，本公开一实施例提供的背光亮度控制方法还包括：所述亮度控制电路向所述背光驱动模块传输占空比值；以及所述背光驱动模块根据所述占空比值控制所述具有所述调整后的电流值的电流的占空比。
例如，本公开一实施例提供的背光亮度控制方法中，所述占空比值为100％。
例如，本公开一实施例提供的背光亮度控制方法还包括：在获取显示面板的出光亮度值之前，所述亮度控制电路向所述背光驱动模块传输初始电流值。
例如，在本公开一实施例提供的背光亮度控制方法中，所述亮度控制电路根据所述大小关系向背光驱动模块传输调整后的电流值包括：若所述出光亮度值大于所述预设亮度值，所述亮度控制电路在所述初始电流值的基础上减去一电流变化值以获取所述调整后的电流值并向所述背光驱动模块传输所述调整后的电流值，若所述出光亮度值小于所述预设亮度值，所述亮度控制电路在所述初始电流值的基础上加上一电流变化值以获取所述调整后的电流值并向所述背光驱动模块传输所述调整后的电流值，所述调整后的电流值根据所述出光亮度值和所述预设亮度值之间的关系进行调整，以使所述显示面板的出光亮度达到所述预设亮度值。
例如，在本公开一实施例提供的背光亮度控制方法中，获取显示面板的出光亮度值包括：将亮度传感器设置在所述背光模组的出光侧或所述显示面板中显示模组的出光侧并输出亮度感测信号；以及根据所述亮度感测信号获取所述显示面板的出光亮度值。
例如，在本公开一实施例提供的背光亮度控制方法中，获取显示模组的出光亮度值还包括：将标准亮度测试仪设置在所述显示面板的出光侧并测量所述显示面板的出光亮度值；调整所述显示面板以改变出光亮度；获取所述标准亮度测试仪测量的不同出光亮度下的多个出光亮度值；获取所述亮度传感器感测的不同出光亮度下的多个亮度感测信号；建立所述多个出光亮度值与所述多个亮度感测信号的对应关系；以及根据所述亮度传感器输出的亮度感测信号和所述对应关系确定所述显示面板的出光亮度值。
例如，在本公开一实施例提供的背光亮度控制方法中，所述多个出光亮度值包括所述预设亮度值，亮度控制电路判断所述出光亮度值与预设亮度值的大小关系包括：根据所述预设亮度值和所述对应关系确定所述预设亮度值对应的亮度感测信号；以及比较所述亮度传感器输出的亮度感测信号与所述预设亮度值对应的亮度感测信号的大小关系。
例如，在本公开一实施例提供的背光亮度控制方法中，所述预设亮度值小于所述显示面板的最大亮度值。
本公开至少一个实施例提供一种背光亮度控制装置，其包括：亮度传感器，被配置为获取显示面板的亮度感测信号；亮度控制电路，与所述亮度传感器通信相连；以及背光驱动模块，与所述亮度控制电路通信相连并与用于所述显示模组的背光模组电性相连，所述亮度控制电路被配置为根据所述亮度感测信号获取所述显示面板的出光亮度值，判断所述出光亮度值与预设亮度值的大小关系，以及根据所述大小关系向背光驱动模块传输调整后的电流值，所述背光驱动模块产生具有所述调整后的电流值的电流以驱动所述显示面板中的背光模组发光。
例如，在本公开一实施例提供的背光亮度控制装置中，所述亮度传感器设置在所述显示面板中的背光模组的发光侧或所述显示面板中的显示模组的发光侧。
例如，在本公开一实施例提供的背光亮度控制装置中，所述亮度控制电路还被配置为向所述背光驱动模块传输占空比值，所述背光驱动模块被配置为根据所述占空比值控制所述具有所述调整后的电流值的电流的占空比。
例如，在本公开一实施例提供的背光亮度控制装置中，所述占空比值包括100％。
例如，在本公开一实施例提供的背光亮度控制装置中，所述背光驱动模块包括：驱动电源，被配置产生驱动电压并通过调整所述驱动电压来调节驱动所述背光模组发光的电流；电流反馈电路，包括与所述背光模组串联的反馈电阻，所述电流反馈电路被配置为根据所述反馈电阻上的反馈电压反馈驱动所述背光模组发光的电流。
例如，在本公开一实施例提供的背光亮度控制装置中，所述背光驱动模块还包括：限流电阻；以及数字电位器，与所述亮度控制电路通信相连并被配置为将所述调整后的电流值转变为电阻，所述限流电阻的一端连接一标准参考电 压，另一端连接到所述数字电位器，从而在所述数字电位器被输入所述调整后的电流值时在所述数字电位器与所述限流电阻连接的一端产生调整电压，所述驱动电源被配置为比较所述反馈电压和所述调整电压值并根据比较结果调节所述驱动电压。
例如，在本公开一实施例提供的背光亮度控制装置中，所述背光驱动模块还包括：电源接口，被配置为与输入电源相连；以及PWM接口，被配置为与PWM总线相连，所述输入电源被配置为所述背光驱动模块提供电源，所述PWM总线被配置为将所述亮度控制电路传输的占空比值传输给所述背光驱动模块。本公开至少一个实施例提供一种显示装置，其包括：显示面板，包括显示模组和背光模组；以及背光亮度控制装置，所述背光亮度控制装置包括上述任一项所述的背光亮度控制装置。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1为一种显示装置的亮度随开机时间的变化曲线图；
图2为一种显示装置的亮度随使用时间的变化曲线图；
图3为一种显示装置的亮度随环境温度的变化曲线图；
图4为一种背光亮度控制装置的示意图；
图5为本公开一实施例提供的一种背光亮度控制方法的流程图；
图6为采用本公开一实施例提供的背光亮度控制方法的显示装置的亮度随开机时间的变化曲线图；
图7为采用本公开一实施例提供的背光亮度控制方法的显示装置的亮度随使用时间的变化曲线图；
图8为采用本公开一实施例提供的背光亮度控制方法的显示装置的亮度随环境温度的变化曲线图；
图9为本公开一实施例提供的一种获取显示面板的出光亮度值的示意图；
图10为本公开一实施例提供的另一种背光亮度控制装置的示意图；
图11为本公开一实施例提供的另一种背光亮度控制装置的示意图；以及
图12为本公开一实施例提供的一种背光驱动模块的示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。
本申请的发明人注意到：图1示出了一种显示装置的亮度随开机时间的变化曲线图。如图1所示，通常的显示装置的背光模组在冷启动时，背光模组中的驱动元件以及发光元件(例如LED)的工作时温度比较低，因此背光模组产生的背光的亮度不能一下达到稳定的亮度，通常需要经过半个小时到一个小时才能达到稳定的亮度。因此，通常的显示装置在开机的半个小时到一个小时内的亮度较低。图2示出了一种显示装置的亮度随使用时间的变化曲线图。如图2所示，当该显示装置使用较长的时间之后，例如几年，背光模组中的发光元件(例如LED)的发光效率会降低，从而导致背光模组产生的背光的亮度下降。因此，通常的显示装置在使用较长的时间后亮度会降低。图3示出了一种显示装置的亮度随环境温度的变化曲线图。如图3所示，当环境温度发生变化时，背光模组产生背光的亮度也会发生变化。所以，为了使得医疗显示器满足显示质量的一致性和整体性的要求，需要对医疗显示器的亮度进行稳定控制。
图4为一种背光亮度控制装置的示意图。如图4所示，该背光亮度控制装置包括：亮度传感器10、亮度控制电路20以及背光驱动模块30。亮度传感器10用于获取显示面板200的亮度感测信号；亮度控制电路20根据亮度感测信号获取显示面板200的出光亮度值，判断出光亮度值与预设亮度值的大小关系，然后通过脉冲宽度调制(PWM)调节背光驱动模块30驱动显示面板200中的 背光模组220的电流的占空比，从而实现对背光亮度的控制。然而，在上述的背光亮度控制装置中，背光驱动模块需要将驱动显示面板中的背光模组的电流设置为最大值，从而导致背光模组始终在最大的电流驱动下，进而降低了背光模组的可靠性和使用寿命。
本公开实施例提供一种背光亮度控制方法以及背光亮度控制装置。该背光亮度控制方法包括获取显示面板的出光亮度值；亮度控制电路判断所述出光亮度值与预设亮度值的大小关系；所述亮度控制电路根据所述大小关系计算需调整的电流值，并向背光驱动模块传输调整后的电流值；以及所述背光驱动模块产生具有所述调整后的电流值的电流以驱动所述显示面板中的背光模组发光。由此，该背光亮度控制方法先通过判断显示面板的出光亮度值与预设的亮度值的小大关系，然后通过调整电流的大小来调整背光模组的发光亮度，从而实现对背光亮度的稳定控制。
下面结合附图对本公开实施例提供的背光亮度控制方法以及背光亮度控制装置进行说明。
本公开一实施例提供一种背光亮度控制方法。图5示出了根据本实施例的一种背光亮度控制方法的流程图。如图5所示，该背光亮度控制方法包括以下步骤S101-S104。
步骤S101：获取显示面板的出光亮度值。
例如，通过亮度传感器来获取显示面板的出光亮度值。
步骤S102：亮度控制电路判断显示面板的出光亮度值与预设亮度值的大小关系。
步骤S103：亮度控制电路根据显示面板的出光亮度值与预设亮度值的大小关系计算需调整的电流值，并向背光驱动模块传输调整后的电流值。
例如，当出光亮度值大于预设亮度值时，可在背光模组的当前电流值的基础上减去一个变化值得到调整后的电流值；当出光亮度值小于预设亮度值时，可在背光模组的当前电流值的基础上增加一个变化值得到调整后的电流值。
步骤S104：背光驱动模块产生具有调整后的电流值的电流以驱动显示面板中的背光模组发光。
需要说明的是，上述的预设亮度值为根据实际需求进行设定的值，也是本实施例提供的背光亮度控制方法所要达到的目标亮度值。
例如，亮度控制电路可包括处理器和存储器，存储器存储有实现上述步骤 的程序，处理器可执行存储器中存储的程序。需要说明的是，本公开实施例包括但不限于此，亮度控制电路也可为可实现上述判断功能的电路。
在本实施例提供的背光亮度控制方法中，先通过判断显示面板的出光亮度值与预设的亮度值的小大关系，然后通过调整电流的大小来调整背光模组的发光亮度，从而实现对背光亮度的稳定控制。当采用本实施例提供的背光亮度控制方法的显示装置冷启动，图6为采用本实施例提供的背光亮度控制方法的显示装置的亮度随开机时间的变化曲线图，如图6所示，在开机的半个小时到一个小时之内，可通过上述方法增大驱动背光模组的电流，从而使得背光模组产生的背光亮度增加以达到预设亮度值；而当背光模组的发光效率稳定之后，可通过上述方法降低驱动背光模组的电流，从而使得背光模组不会产生较高的亮度以保持预设亮度值，进而实现对背光亮度的稳定控制。图7示出了一种采用本实施例提供的背光亮度控制方法的显示装置的亮度随使用时间的变化曲线图。如图7所示，可在显示装置刚开始使用时，设定预设亮度值小于该显示装置的最大亮度值，当采用本实施例提供的背光亮度控制方法的显示装置使用较长的时间之后，例如几年之后，可通过上述方法降低驱动背光模组的电流，从而使得背光模组不会产生较高的亮度以保持预设亮度值。图8示出了一种采用本实施例提供的背光亮度控制方法的显示装置的亮度随环境温度的变化曲线图。如图8所示，可通过上述方法增大或减小驱动背光模组的电流，从而使得背光模组产生的背光亮度保持稳定，进而实现对背光亮度的稳定控制。
例如，在本实施例一示例提供的背光亮度控制方法中，预设亮度值小于显示面板的最大亮度值。由此，可在显示装置的使用寿命不长的时候，保证一个冗余度，从而确保显示装置在整个使用寿命周期中保持亮度稳定。另外，采用调节驱动背光模组的电流的空占比的方式来进行背光亮度控制时，需要采用最大的电流来驱动显示面板的背光模组中的发光元件(例如LED)；然而，在采用本实施例提供的背光亮度控制方法进行背光亮度控制时显示面板的背光模组中的发光元件(例如LED)的电流较小，避免长期高电流驱动，从而可提高发光元件(例如LED)的可靠性和稳定性。
例如，可将预设亮度值设置为显示面板的最大亮度值的50％-75％的范围内，从而可一方面保证足够的亮度，另一方面可显示装置在整个使用寿命周期中保持亮度稳定。需要说明的是，当预设亮度值设置得较低时，显示面板要达到预设亮度值所需要的电流值可为较低的电流值，从而随着背光模组中的发光 元件等器件的老化，发光效率降低，亮度降低时，逐步提升驱动背光模组的电流，因此，背光模组的发光元件(例如LED)等器件不需要长期在最大电流状态下工作，从而确保了背光模组的发光元件(例如LED)等器件的可靠性。
例如，本实施例一示例提供的背光亮度控制方法还可包括：亮度控制电路向背光驱动模块传输占空比值；以及背光驱动模块根据占空比值控制具有调整后的电流值的电流的占空比。由此，除了对背光亮度的稳定控制之外，本实施例提供的背光亮度控制方法还提供了通过调节具有调整后的电流值的电流的占空比来调节背光亮度的方式。也就是说，本实施例提供的背光亮度控制方法可对背光亮度进行稳定控制，还可对背光亮度进行调节。例如，当采用本实施例提供的背光亮度控制方法的显示装置用于诊断治疗时，本实施例提供的背光亮度控制方法不仅可对背光亮度进行稳定控制，以保证显示装置显示的医疗图像或影像(例如DR、CR、CT以及3D图像或影像)的一致性和整体性；当采用本实施例提供的背光亮度控制方法的显示装置用于其他常规用途时，用户可根据自己的喜好通过本实施例提供的背光亮度控制方法对亮度进行调节。
例如，在本实施例一示例提供的背光亮度控制方法中，在显示面板用于医疗诊断时，上述的空占比为100％，从而可保证显示面板显示的医疗图像或影像(例如DR、CR、CT以及3D图像或影像)的一致性和整体性。需要说明的是，当显示面板用于医疗诊断时，其显示的画面的伽马(gamma)曲线应用DICOM标准；在这种情况下，要求空占比为100％，对比度也是100％，通过本实施例提供的背光亮度控制方法可确保医疗显示器在255灰阶下显示最大亮度，其他灰阶满足DICOM标准。值得注意的是，当显示面板用于医疗诊断时，用户不能调整亮度、对比度和占空比，从而保证医疗图像或影像(例如DR、CR、CT以及3D图像或影像)的一致性和整体性。
例如，本实施例一示例提供的背光亮度控制方法还包括：在获取显示面板的出光亮度值之前，亮度控制电路向背光驱动模块传输初始电流值。需要说明的是，上述的初始电流值可根据实际情况进行设置。例如，上述的初始电流值可通过背光模组中发光元件的技术参数来确定，或者将上述的初始电流值设置为通过试验确定的达到预设亮度值的电流值(随着显示面板的使用和老化，达到预设亮度值的电流值会产生变化)。
例如，在本实施例一示例提供的背光亮度控制方法中，亮度控制电路根据显示面板的出光亮度值与预设亮度值的大小关系向背光驱动模块传输调整后 的电流值可包括：若出光亮度值大于预设亮度值，亮度控制电路在初始电流值的基础上减去一电流变化值以获取调整后的电流值并向背光驱动模块传输调整后的电流值；若出光亮度值小于预设亮度值，亮度控制电路在初始电流值的基础上加上一电流变化值以获取调整后的电流值并向背光驱动模块传输调整后的电流值；调整后的电流值根据出光亮度值和预设亮度值之间的关系进行调整(例如，多次调整)，以使显示面板的出光亮度达到预设亮度值。
例如，在本实施例一示例提供的背光亮度控制方法中，获取显示面板的出光亮度值包括：将亮度传感器设置在显示面板中背光模组的出光侧或显示面板中显示模组的出光侧并输出亮度感测信号；以及根据亮度感测信号获取所述显示面板的出光亮度值。由此，通过设置在背光模组的出光侧或显示模组的出光侧的亮度传感器来获取显示面板的出光亮度值。需要说明的是，如果将亮度传感器设置在显示面板的出光侧，此时显示面板的出光亮度等于显示模组出光侧的亮度，如果将亮度传感器设置在背光模组的出光侧，此时背光模组出光侧的亮度为显示面板的出光亮度的几倍到几十倍。
例如，在本实施例一示例提供的背光亮度控制方法中，获取显示模组的出光亮度值还包括：如图9所示，将标准亮度测试仪500设置在显示模组210的出光侧并测量显示面板200的出光亮度值；调整显示面板以改变出光亮度；获取标准亮度测试仪500测量的不同出光亮度下的多个出光亮度值；获取亮度传感器110感测的不同出光亮度下的多个亮度感测信号；建立多个出光亮度值与多个亮度感测信号的对应关系；以及根据亮度传感器110输出的亮度感测信号和对应关系确定显示面板的出光亮度值。由此，一方面，可通过在不同出光亮度下标准亮度测试仪测量的显示面板的出光亮度值与亮度传感器测量的亮度感测信号建立亮度传感器输出的亮度感测信号和对应关系；另一方面，可通过标准亮度测试仪对亮度传感器进行校正。
例如，表1为一种根据多个出光亮度值与多个亮度感测信号的对应关系表。如表1所示，多个亮度感测信号可为十六进制的数字信号，例如A5、AA、AE；通过表1中的多个出光亮度值与多个亮度感测信号的对应关系表，当亮度传感器感测到的亮度感测信号为A5时，此时显示面板的出光亮度值为490nit，当亮度传感器感测到的亮度感测信号为AA时，此时显示面板的出光亮度值为500nit，当亮度传感器感测到的亮度感测信号为AE时，此时显示面板的出光亮度值为510nit。当然，表1所示的多个出光亮度值与多个亮度感测信号的对 应关系表仅为示例性地说明多个出光亮度值与多个亮度感测信号的对应关系，本公开实施例包括但不限于此。
表1-多个出光亮度值与多个亮度感测信号的对应关系表
Figure PCTCN2017117481-appb-000001
例如，在本实施例一示例提供的背光亮度控制方法中，多个出光亮度值包括预设亮度值。亮度控制电路判断出光亮度值与预设亮度值的大小关系的步骤包括：根据预设亮度值和对应关系确定预设亮度值对应的亮度感测信号，例如当预设亮度值为500nit时，根据表1所示的多个出光亮度值与多个亮度感测信号的对应关系表可确定预设亮度值对应的亮度感测信号(十六进制)为AA；比较亮度传感器输出的亮度感测信号与预设亮度值对应的亮度感测信号的大小关系，例如，亮度传感器输出的亮度感测信号为A5时，A5小于AA，也就是说，出光亮度值小于预设亮度值；亮度传感器输出的亮度感测信号为AA时，AA等于AA，也就是说，出光亮度值等于预设亮度值；亮度传感器输出的亮度感测信号为AE时，AE大于AA，也就是说，出光亮度值大于预设亮度值。
本公开一实施例提供一种背光亮度控制装置。图10示出了根据本实施例的一种背光亮度控制装置。如图10所示，该背光亮度控制装置包括：亮度传感器110、亮度控制电路120以及背光驱动模块130。亮度传感器110用于获取显示面板200的亮度感测信号；亮度控制电路120与亮度传感器110通信相连；背光驱动模块130与亮度控制电路120通信相连并与显示面板200的背光模组220电性相连；亮度控制电路120根据亮度感测信号获取显示面板200的出光亮度值，判断出光亮度值与预设亮度值的大小关系，以及根据出光亮度值与预设亮度值的大小关系向背光驱动模块传输调整后的电流值，背光驱动模块产生具有调整后的电流值的电流以驱动显示面板200中的背光模组220发光。
在本实施例提供的背光亮度控制装置中，背光控制模组先通过判断显示面板的出光亮度值与预设的亮度值的小大关系，然后通过调整电流的大小来调整背光模组的发光亮度，从而实现对背光亮度的稳定控制。
例如，在本实施例一示例提供的背光亮度控制装置中，预设亮度值小于显 示面板的最大亮度值。由此，可在显示装置的使用寿命不长的时候，保证一个冗余度，从而确保显示装置在整个使用寿命周期中保持亮度稳定。另外，采用调节驱动背光模组的电流的空占比的方式来进行背光亮度控制时，需要采用最大的电流来驱动显示面板的背光模组中的发光元件(例如LED)；然而，在采用本实施例提供的背光亮度控制装置进行背光亮度控制时显示面板的背光模组中的发光元件(例如LED)的电流较小，避免长期高电流驱动，从而可提高发光元件(例如LED)的可靠性和稳定性。
例如，如图10所示，亮度控制电路120与亮度传感器110通过I2C总线通信相连。需要说明的是，I2C是集成电路总线(Inter-Integrated Circuit)，是两个芯片之间数据交换串行数据接口线，从而使得两个芯片之间可以双向传送少量的数字数据信号。例如，如图10所示，背光驱动模块130与亮度控制电路120通过I2C总线通信相连。
例如，亮度传感器设置在显示面板中的背光模组的发光侧或显示面板中的显示模组的发光侧，本公开实施例在此不作限制。
例如，图11示出了根据本实施例的另一种背光亮度控制装置。如图10所示，在本实施例一示例提供的背光亮度控制装置中，亮度控制电路还可向背光驱动模块传输占空比值，背光驱动模块被配置为根据占空比值控制具有调整后的电流值的电流的占空比。由此，除了对背光亮度的稳定控制之外，本实施例提供的背光亮度控制装置还提供了通过调节具有调整后的电流值的电流的占空比来调节背光亮度的方式。也就是说，本实施例提供的背光亮度控制装置不仅可对背光亮度进行稳定控制，还可对背光亮度进行调节。例如，当采用本实施例提供的背光亮度控制装置的显示装置用于诊断治疗时，本实施例提供的背光亮度控制装置可对背光亮度进行稳定控制，以保证显示装置显示的医疗图像或影像(例如DR、CR、CT以及3D图像或影像)的一致性和整体性；当采用本实施例提供的背光亮度控制装置的显示装置用于其他常规用途时，用户可根据自己的喜好通过本实施例提供的背光亮度控制方法对亮度进行调节。
例如，如图11所示，背光驱动模块130与亮度控制电路120还通过PWM(脉冲宽度调制)总线通信相连。
例如，在本实施例一示例提供的背光亮度控制装置中，占空比值包括100％，从而可保证显示面板显示的医疗图像或影像(例如DR、CR、CT以及3D图像或影像)的一致性和整体性。
例如，图12示出了根据本实施例的一种背光驱动模块的示意图。如图11所示，背光驱动模块130包括驱动电源131以及电流反馈电路132。驱动电源131产生驱动电压并通过调整驱动电压来调节驱动背光模组220发光的电流；电流反馈电路132包括与背光模组220串联的反馈电阻1320，电流反馈电路132可根据反馈电阻1320上的反馈电压VFDB反馈驱动背光模组220发光的电流。由此，可通过反馈电压VFDB来监测背光模组220上的驱动电流。
例如，在本实施例一示例提供的背光驱动模块中，如图12所示，背光驱动模块130还包括：限流电阻133以及数字电位器134。数字电位器134与亮度控制电路(未示出)通信相连并可将调整后的电流值转变为电阻，限流电阻133的一端连接一标准参考电压Vref，另一端连接到数字电位器134，从而在数字电位器134被输入调整后的电流值时在数字电位器134与限流电阻133连接的一端产生调整电压Vad，驱动电源131可比较反馈电压VFDB和调整电压Vad并根据比较结果调节驱动电压。例如，若反馈电压VFDB大于调整电压Vad，说明背光模组220的驱动电流大于调整后的电流，驱动电源131则降低驱动电压；若反馈电压VFDB小于调整电压Vad，说明背光模组220的驱动电流小于调整后的电流，驱动电源131则增加驱动电压。
例如，在本实施例一示例提供的背光驱动模块中，如图12所示，背光驱动模块130还包括：电源接口135以及PWM接口136，分别与输入电源300以及PWM总线相连。输入电源为驱动模块提供电源，PWM总线用于将亮度控制电路的占空比值传输给背光驱动模块。例如，输入电源可为24V或者48V，此时驱动电源可为升压电路，也就是把24V获48V提升到背光模组所需要的电压，比如65V。
例如，在本实施例一示例提供的背光驱动模块中，背光模组可为LED背光模组。当然，本公开实施例包括但不限于此。
例如，在本实施例一示例提供的背光驱动模块中，显示模组可为液晶显示面板。当然，本公开实施例包括但不限于此。
本公开一实施例提供一种显示装置，其包括显示面板，包括显示模组和背光模组；以及背光亮度控制装置，背光亮度控制装置可为实施例二中任一示例所描述的背光亮度控制装置。由此，该显示装置可对背光亮度进行稳定控制，从而可用于医疗诊断。
有以下几点需要说明：
(1)本公开实施例附图中，只涉及到与本公开实施例涉及到的结构，其他结构可参考通常设计。
(2)在不冲突的情况下，本公开同一实施例及不同实施例中的特征可以相互组合。
以上所述，仅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，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (17)

  1. 一种背光亮度控制方法，包括：
    获取显示面板的出光亮度值；
    亮度控制电路判断所述出光亮度值与预设亮度值的大小关系；
    所述亮度控制电路根据所述大小关系计算需调整的电流值，并向背光驱动模块传输调整后的电流值；以及
    所述背光驱动模块产生具有所述调整后的电流值的电流以驱动所述显示面板中的背光模组发光。
  2. 根据权利要求1所述的背光亮度控制方法，还包括：
    所述亮度控制电路向所述背光驱动模块传输占空比值；以及
    所述背光驱动模块根据所述占空比值控制所述具有所述调整后的电流值的电流的占空比。
  3. 根据权利要求2所述的背光亮度控制方法，其中，所述占空比值为100％。
  4. 根据权利要求1-3中任一项所述的背光亮度控制方法，还包括：在所述获取显示面板的出光亮度值之前，所述亮度控制电路向所述背光驱动模块传输初始电流值。
  5. 根据权利要求4所述的背光亮度控制方法，其中，所述亮度控制电路根据所述大小关系向背光驱动模块传输调整后的电流值包括：
    若所述出光亮度值大于所述预设亮度值，所述亮度控制电路在所述初始电流值的基础上减去一电流变化值以获取所述调整后的电流值并向所述背光驱动模块传输所述调整后的电流值，
    若所述出光亮度值小于所述预设亮度值，所述亮度控制电路在所述初始电流值的基础上加上一电流变化值以获取所述调整后的电流值并向所述背光驱动模块传输所述调整后的电流值，
    其中，所述调整后的电流值根据所述出光亮度值和所述预设亮度值之间的关系进行调整，以使所述显示面板的出光亮度达到所述预设亮度值。
  6. 根据权利要求1-5中任一项所述的背光亮度控制方法，其中，获取显示面板的出光亮度值包括：
    将亮度传感器设置在所述背光模组的出光侧或所述显示面板中显示模组的出光侧并输出亮度感测信号；以及
    根据所述亮度感测信号获取所述显示面板的出光亮度值。
  7. 根据权利要求6所述的背光亮度控制方法，其中，获取显示模组的出光亮度值还包括：
    将标准亮度测试仪设置在所述显示面板的出光侧并测量所述显示面板的出光亮度值；
    调整所述显示面板以改变出光亮度；
    获取所述标准亮度测试仪测量的不同出光亮度下的多个出光亮度值；
    获取所述亮度传感器感测的不同出光亮度下的多个亮度感测信号；
    建立所述多个出光亮度值与所述多个亮度感测信号的对应关系；以及
    根据所述亮度传感器输出的亮度感测信号和所述对应关系确定所述显示面板的出光亮度值。
  8. 根据权利要求7所述的背光亮度控制方法，其中，所述多个出光亮度值包括所述预设亮度值,亮度控制电路判断所述出光亮度值与预设亮度值的大小关系包括：
    根据所述预设亮度值和所述对应关系确定所述预设亮度值对应的亮度感测信号；以及
    比较所述亮度传感器输出的亮度感测信号与所述预设亮度值对应的亮度感测信号的大小关系。
  9. 根据权利要求1-8中任一项所述的背光亮度控制方法，其中，所述预设亮度值小于所述显示面板的最大亮度值。
  10. 一种背光亮度控制装置，包括：
    亮度传感器，被配置为获取显示面板的亮度感测信号；
    亮度控制电路，与所述亮度传感器通信相连；以及
    背光驱动模块，与所述亮度控制电路通信相连并与用于所述显示模组的背光模组电性相连，
    其中，所述亮度控制电路被配置为根据所述亮度感测信号获取所述显示面板的出光亮度值，判断所述出光亮度值与预设亮度值的大小关系，以及根据所述大小关系向背光驱动模块传输调整后的电流值，所述背光驱动模块产生具有所述调整后的电流值的电流以驱动所述显示面板中的背光模组发光。
  11. 根据权利要求10所述背光亮度控制装置，其中，所述亮度传感器设置在所述显示面板中的背光模组的发光侧或所述显示面板中的显示模组的发 光侧。
  12. 根据权利要求10所述背光亮度控制装置，其中，所述亮度控制电路还被配置为向所述背光驱动模块传输占空比值，所述背光驱动模块被配置为根据所述占空比值控制所述具有所述调整后的电流值的电流的占空比。
  13. 根据权利要求12所述的背光亮度控制装置，其中，所述占空比值包括100％。
  14. 根据权利要求10-13中任一项所述的背光亮度控制装置，其中，所述背光驱动模块包括：
    驱动电源，被配置产生驱动电压并通过调整所述驱动电压来调节驱动所述背光模组发光的电流；
    电流反馈电路，包括与所述背光模组串联的反馈电阻，
    其中，所述电流反馈电路被配置为根据所述反馈电阻上的反馈电压反馈驱动所述背光模组发光的电流。
  15. 根据权利要求14所述的背光亮度控制装置，其中，所述背光驱动模块还包括：
    限流电阻；以及
    数字电位器，与所述亮度控制电路通信相连并被配置为将所述调整后的电流值转变为电阻，
    其中，所述限流电阻的一端连接一标准参考电压，另一端连接到所述数字电位器，从而在所述数字电位器被输入所述调整后的电流值时在所述数字电位器与所述限流电阻连接的一端产生调整电压，所述驱动电源被配置为比较所述反馈电压和所述调整电压值并根据比较结果调节所述驱动电压。
  16. 根据权利要求15所述的背光亮度控制装置，其中，所述背光驱动模块还包括：
    电源接口，被配置为与输入电源相连；以及
    PWM接口，被配置为与PWM总线相连，
    其中，所述输入电源被配置为所述背光驱动模块提供电源，所述PWM总线被配置为将所述亮度控制电路传输的占空比值传输给所述背光驱动模块。
  17. 一种显示装置，包括：
    显示面板，包括显示模组和背光模组；以及
    背光亮度控制装置，
    其中，所述背光亮度控制装置包括根据权利要求10-16中任一项所述的背光亮度控制装置。
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