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WO2018120861A1 - Procédé et dispositif d'obtention et de traitement de données de luminosité de rétroéclairage, et dispositif d'affichage à cristaux liquides - Google Patents

Procédé et dispositif d'obtention et de traitement de données de luminosité de rétroéclairage, et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2018120861A1
WO2018120861A1 PCT/CN2017/098406 CN2017098406W WO2018120861A1 WO 2018120861 A1 WO2018120861 A1 WO 2018120861A1 CN 2017098406 W CN2017098406 W CN 2017098406W WO 2018120861 A1 WO2018120861 A1 WO 2018120861A1
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WIPO (PCT)
Prior art keywords
backlight
brightness data
data
dimming signal
pwm dimming
Prior art date
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Ceased
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PCT/CN2017/098406
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English (en)
Chinese (zh)
Inventor
骆俊谕
洪胜峰
刘明涛
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Hisense Electric Co Ltd
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Hisense Electric Co Ltd
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Publication of WO2018120861A1 publication Critical patent/WO2018120861A1/fr
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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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0613—The adjustment depending on the type of the information to be displayed
    • G09G2320/062—Adjustment of illumination source parameters

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a backlight brightness data acquisition and processing method and apparatus, and a liquid crystal display device.
  • the conventional display device includes a display component 101 , a backlight module 102 , a backlight driving device 103 , a PWM (Pulse Width Modulation) controller 104 , a photo sensor device 105 , and a brightness data processor 106 .
  • the display component 101 is configured to receive and display an image.
  • the backlight module 102 is used to provide a backlight for the display assembly 101 so that the display assembly 101 displays an image.
  • the backlight driving device 103 is configured to provide driving power to the backlight module according to the PWM dimming signal provided by the PWM controller 104, so that the backlight module 102 emits light to provide backlighting for the display component 101.
  • the brightness data processor 106 is configured to adjust the duty ratio of the PWM dimming signal provided by the PWM controller 104 according to the brightness data of the backlight provided by the backlight module 102 obtained by the photo sensor device 105, so that the backlight module 102 is adjusted.
  • a brightness-stabilized backlight is provided for display component 101.
  • the brightness of the backlight of the backlight module 102 is stabilized by the display device: the brightness data processor 106 sends a read command to the light sensor device 105, and the light sensor device 105 receives the read command and reads the backlight module 102.
  • the brightness data of the backlight is provided and sent to the brightness data processor 106.
  • the brightness data processor 106 acquires the brightness data of a certain number of times, calculates the average brightness data, and compares the calculated average brightness data with the current brightness data of the backlight module 102, and compares with the target brightness data, according to the comparison result.
  • the duty ratio of the PWM dimming signal provided by the PWM controller 104 is adjusted so that the backlight luminance data of the backlight module 102 is the target luminance data.
  • the present disclosure provides a method and apparatus for acquiring and processing backlight brightness data, and a liquid crystal display device.
  • a method for acquiring backlight luminance data is provided, which is applied to a liquid crystal display device incorporating a photosensor device, the method comprising: receiving a PWM dimming signal sent by a PWM controller; Whether the received PWM dimming signal includes a preset hopping; if the PWM dimming signal includes the preset hopping, sending a read to the optical sensor device at a set time after the preset hopping Taking instruction; receiving backlight brightness data acquired by the photo sensor device according to the read instruction.
  • a backlight brightness data processing method comprising: acquiring at least one backlight brightness data, wherein acquiring any one of the backlight brightness data comprises: obtaining by the embodiment of the first aspect described above a method for backlight luminance data, acquiring any one of the backlight luminance data; and determining, according to the at least one backlight luminance data, current luminance data corresponding to the PWM dimming signal at a current duty ratio.
  • a liquid crystal display device includes: a display component, a backlight module that provides a backlight for the display component, a backlight driving device, a PWM controller, a photo sensor device, a processor, And a memory for storing the program code; the backlight module is connected to the backlight driving device; the PWM controller is connected to the backlight driving device; the photo sensor device is disposed at the backlight module, and The processor is connected to the PWM controller and the memory, and is configured to read program code stored in the memory, and is configured to: receive PWM dimming sent by the PWM controller a signal; determining whether the received PWM dimming signal includes a preset hopping; if the PWM dimming signal includes the preset hopping, then setting the time after the preset hopping to the The light sensor device transmits a read command; and receives backlight brightness data acquired by the light sensor device according to the read command.
  • 1 is a schematic structural view of a display device
  • FIG. 2 is a schematic diagram of a sampling time of luminance data of a photosensor device
  • FIG. 3 is a schematic flowchart diagram of a method for acquiring backlight luminance data according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart diagram of a method for processing backlight luminance data according to an embodiment of the present disclosure
  • FIG. 5 is a schematic flowchart diagram of another method for processing backlight brightness data according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of an apparatus for acquiring backlight luminance data according to an embodiment of the present disclosure
  • FIG. 7 is a schematic structural diagram of a backlight luminance data processing apparatus according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present disclosure.
  • the brightness data processor 106 sends a read command to the light sensor device 105 to be randomly transmitted.
  • the transmission time at which the luminance data processor 106 sends the read command to the optical sensor device 105 is not completely the same, which will cause the sampling time point of the luminance data of the photosensor device 105 to change. That is, the sampling time point may start at any time in the time when the PWM signal is high level and low level, as shown in FIG. 2 .
  • FIG. 2 As can be seen from FIG.
  • the integration time TS0 and TS1 of the light sensor device 105 for each sampling of the luminance data are equal, the opening and closing times of the backlight module 102 corresponding to each sampling integration time are different, resulting in In the sampling integration times TS0 and TS1, the luminance data read by the photosensor device 105 is different.
  • the brightness data of the certain number of times acquired by the brightness data processor 106 has a large difference, and the calculated current brightness data of the backlight module 102 is inaccurate.
  • the current brightness data is different from the target brightness data, the brightness is different.
  • the adjustment of the duty cycle of the PWM dimming signal provided by the PWM controller 104 by the data processor 106 is also inaccurate, resulting in the backlight brightness of the backlight module 102 becoming more unstable.
  • FIG. 3 is a flowchart of a method of acquiring backlight luminance data, according to an embodiment of the present disclosure. This method is applied to a liquid crystal display device incorporating a photosensor device. As shown in FIG. 3, the method includes:
  • Step 201 Receive a PWM dimming signal sent by a PWM controller.
  • the PWM controller can periodically transmit the PWM dimming signal to the device for acquiring the backlight luminance data, so that the device for acquiring the backlight luminance data can know the duty ratio of the current PWM dimming signal.
  • the device that obtains the backlight luminance data can receive the PWM dimming signal sent by the PWM controller.
  • Step 202 Determine whether the received PWM dimming signal includes a preset hopping.
  • the brightness of the backlight provided by the backlight module is determined by the duty cycle of the PWM dimming signal. Therefore, when adjusting the brightness of the backlight of the backlight module, it is necessary to adjust the current duty ratio of the PWM dimming signal.
  • the adjustment of the duty ratio of the PWM dimming signal needs to be determined according to the brightness data of the backlight provided by the backlight module. In order to ensure the stability of the brightness of the backlight provided by the backlight module, it is necessary to periodically detect the brightness data of the backlight provided by the backlight module, and when the brightness data is not the target brightness data, the brightness of the backlight provided by the backlight module is illustrated.
  • the current duty ratio of the PWM dimming signal needs to be adjusted, so that the brightness data of the backlight provided by the backlight module is re-targeted to achieve the brightness of the backlight provided by the backlight module.
  • the device for acquiring the backlight brightness data needs to obtain the brightness data of the backlight provided by the backlight module.
  • the transmission time for transmitting the read command to the photosensor device is random and has no regularity. This causes the time of the read command received by the photosensor device to be unstable, so that the backlight luminance data collected each time is the backlight luminance data at different times of the PWM dimming period, as shown in FIG. 2 .
  • the set time for sending a read command requires a reference time, which is the start time of the time when the read command is sent.
  • the reference time needs to be the same for each time the read command is sent to the photosensor device, so that the device for obtaining the backlight luminance data can be realized to the photosensor device.
  • the time to send a read command is stable, rather than being sent randomly, so that the calculated brightness is accurate.
  • the device that acquires the backlight luminance data can periodically receive the PWM dimming signal, it can be detected that the received PWM dimming signal includes the preset hopping time as the reference time.
  • the device for acquiring the backlight luminance data needs to detect whether the PWM dimming signal includes a preset hopping.
  • the preset transition includes: a rising edge transition of the signal and/or a falling edge of the signal.
  • determining whether the received PWM dimming signal includes a preset jump includes:
  • the device that acquires the backlight luminance data detects whether the PWM dimming signal has a rising edge transition after receiving the PWM dimming signal.
  • the PWM dimming signal has a rising edge transition
  • the device for acquiring backlight luminance data detects whether the PWM dimming signal has a falling edge transition after receiving the PWM dimming signal.
  • the PWM dimming signal has a falling edge transition, it is determined that the PWM dimming signal includes a preset transition.
  • the device for acquiring the backlight luminance data detects whether the PWM dimming signal has a rising edge jump after receiving the PWM dimming signal. The change and the falling edge jump.
  • the PWM dimming signal has a rising edge transition and a falling edge transition, it is determined that the PWM dimming signal includes a preset transition.
  • the device may detect whether the received PWM dimming signal has a preset voltage change, that is, whether the PWM dimming signal has detection The voltage change corresponding to the rising edge transition and/or the voltage change corresponding to the falling edge transition.
  • the PWM dimming signal includes a preset hopping, which is not limited by the embodiment of the present disclosure.
  • the device for obtaining the backlight luminance data After receiving the PWM dimming signal sent by the PWM controller, the device for obtaining the backlight luminance data determines whether the PWM dimming signal includes a rising edge transition and a falling edge transition, that is, detecting whether the PWM dimming signal is a complete cycle. Dimming signal. If it is detected that the PWM dimming signal includes a rising edge transition and a falling edge transition, it can be determined that the PWM dimming signal is a full period dimming signal.
  • the dimming period of the PWM signal can be determined by detecting the time interval between the rising edge and the adjacent falling edge, or the dimming period of the PWM signal can be directly read from the pre-stored position.
  • Step 203 If the PWM dimming signal includes a preset jump, send a read command to the photosensor device at a set time after the preset jump.
  • the device that detects the PWM dimming signal including the preset hopping may be used as the reference time, and starts counting at the reference time, and reaches the setting. After the time, a read command is sent to the photosensor device. That is, the device for acquiring the backlight luminance data sends a read command to the photosensor after the interval is set after detecting that the PWM dimming signal includes the preset transition.
  • the set time for transmitting the read command may be the same for each backlight brightness data sample. That is to say, each time the backlight brightness data is acquired, after determining that the received PWM dimming signal includes a preset jump, when the set time is reached, a read command is sent to the photosensor device and sampled.
  • the sampling includes at least two batches of sampling, and the sampling time of each batch sampling is the same time point of the dimming period, and there is a corresponding delay between the samplings of different batches. Taking two batches of sampling as an example, in the adjacent multiple PWM dimming cycles, the first batch of samples is taken at the time T1 after the start of the rising edge, and then the second batch is performed at the time T2 after the start of the rising edge.
  • the duration of each sample described above may be set such that the sample of the duration reflects the brightness value at the current duty cycle.
  • the backlight luminance data is collected multiple times at a certain time interval, thereby calculating More accurate backlight brightness value.
  • the device for acquiring the backlight luminance data sends the read command to the photosensor device.
  • the time is the same time in each PWM dimming period, so that the time period in which the photosensor device collects the backlight luminance data is a fixed period of time in the PWM dimming period, so that the backlight luminance data collected by the photosensor device is stable. .
  • the apparatus for acquiring backlight luminance data can determine that the PWM dimming signal includes a rising edge jump after determining that the PWM dimming signal includes a rising edge transition and a falling edge transition. The time of the change and the falling edge jump starts, and after the set time is reached, a read command is sent to the photosensor device.
  • the read command is sent to the photosensor device, considering the time consumed by the signal transmission and the device response time.
  • the sampling period is compared with the dimming period. The time is relatively determined during the dimming cycle.
  • Step 204 Receive backlight brightness data acquired by the light sensor device according to the read instruction.
  • the light sensor device can collect the brightness data of the backlight provided by the backlight module, that is, the backlight brightness data, and send the acquired backlight brightness data to the device for acquiring the backlight brightness data.
  • the device for acquiring backlight luminance data receives backlight luminance data acquired by the light sensor device according to the read command.
  • the optical sensor device can collect the brightness data of the backlight provided by the backlight module, that is, the backlight brightness data, and send the acquired backlight brightness data to the device for acquiring the backlight brightness data.
  • a device that acquires backlight luminance data can acquire backlight luminance data.
  • the light sensor device can acquire backlight brightness data in a high level period in the PWM signal, and acquire backlight brightness data in a low level period in the PWM signal, so that the display can be calculated according to the dimming period of the PWM signal.
  • brightness As an implementation manner, in a statistical period, the ratio of the cumulative number of times the light sensor component collects the backlight luminance data in the corresponding period of the high level to the cumulative number of times the backlight luminance data is collected in the time period corresponding to the low level may be compared with the PWM. The ratio of the high level duration to the low level duration in the dimming cycle is equal.
  • the set time and the sampling time interval may be set, for example, to enable acquisition in the corresponding period of the high level.
  • the ratio of the cumulative number of times of the backlight luminance data to the cumulative number of times of collecting the backlight luminance data in the time period corresponding to the low level is also 3:1, and the accurate backlight brightness corresponding to the current PWM dimming signal can be calculated by using the sampled data. value.
  • multiple sampling at equal intervals may be performed during the dimming period, and then an average is obtained based on the sampling result.
  • the device for transmitting the backlight brightness data may send a read command to the photosensor device at the set time after determining that the received PWM dimming signal includes the preset jump, instead of Randomly transmitting, so that the sending read command has a time basis, that is, the time for transmitting the read command for the device for acquiring the backlight brightness data is more stable, so that the time for the optical sensor device to receive the read command is more stable, and the optical sensor device obtains The backlight brightness data is more stable, thereby improving the stability of the backlight brightness of the display device.
  • an embodiment of the present disclosure provides a method for processing backlight luminance data, including:
  • Step 301 Acquire at least one backlight brightness data.
  • the obtaining the backlight brightness data includes: obtaining the backlight brightness data by using the method for acquiring backlight brightness data according to the foregoing embodiment.
  • a backlight brightness data may be backlight brightness data obtained by each sampling, or may be backlight brightness data received after a read command is sent.
  • the backlight brightness data processing device needs to acquire at least one backlight brightness data.
  • the backlight luminance data may be acquired through the above steps 201-204.
  • steps 201 and 202 are not necessary to obtain some of the backlight luminance data(s).
  • the set time in the above step 203 may be the same or different.
  • the set time for transmitting the read command may be the same for at least one backlight luminance data. That is to say, when each backlight brightness data is acquired, after determining that the PWM dimming signal includes a preset jump, when the set time is reached, a read command is sent to the photosensor device and sampled.
  • the number of times of sampling of each of the backlight luminance data described above may be set such that the sampling of the number of times can reflect the luminance value at the current duty ratio.
  • the backlight brightness data is collected multiple times at a certain time interval, so that the calculation is accurate. The backlight brightness value.
  • the time period during which the photosensor device collects each backlight luminance data is a fixed period of time within the PWM dimming period.
  • the set time includes: the set time is based on the number of received backlight brightness data, using the formula definite.
  • T PWM is the period of the PWM dimming signal
  • x is the number of at least one backlight luminance data to be acquired for one period length
  • i is the number of received backlight luminance data.
  • one cycle length herein can mean that the x data needs to be acquired in one dimming cycle, or that the x data is acquired in multiple dimming cycles, but the manner of obtaining is obtained. It is equivalent to the case where all x data are acquired in one dimming cycle.
  • the set time is that the backlight luminance data processing device uses the formula according to the number of backlight luminance data that has been received before transmitting the read command. computational.
  • the read command sent by the backlight brightness data processing device corresponds to the sending time of different read commands, so that the light sensor device can read the backlight brightness data at different times in the length of one PWM dimming cycle and then pass, for example, averaging.
  • the value gives the average brightness of the backlight.
  • the period of the PWM dimming signal can be divided into x time segments, and the backlight brightness data processing device acquires the backlight brightness data in different periods of the period of the PWM dimming signal, that is, the backlight brightness data processing device converts the PWM dimming signal
  • the period is divided into at least one time period, and the backlight brightness data processing device acquires the backlight brightness data once in each time period, thereby acquiring at least one backlight brightness data.
  • the ratio of the cumulative number of acquisitions corresponding to the high-level position of the photosensor device in the dimming period to the cumulative number of acquisitions corresponding to the low-level position may be compared with the high-level duration and low-voltage of the PWM dimming period.
  • the ratio of the usual length is equal.
  • the set time includes: the set time is based on the number of backlight luminance data that has been received, and the formula is used. definite.
  • ⁇ T c represents the delay time between the PWM controller providing the PWM signal and the backlight module providing the backlight.
  • the backlight brightness data processing device acquires the read command transmission time corresponding to the qth backlight luminance data, that is, the set time is or,
  • the backlight brightness data processing device can be at intervals after the preset hopping Or, the interval
  • the read command is sent to the photo sensor device.
  • the photo sensor device can transmit the acquired backlight brightness data to the backlight brightness data processing device, and the backlight brightness data processing device can obtain the qth backlight brightness data.
  • the qth backlight brightness data is any one of the at least one backlight brightness data.
  • the backlight brightness data processing device may first detect that the PWM dimming signal sent by the received PWM controller includes a preset hopping, and preset the hopping time as a reference time. A read command is sent to the photosensor device and x backlight luminance data is sampled. That is to say, the x data can be acquired in one dimming cycle, and x read commands are sent in the dimming cycle, that is, x backlight luminance data are read.
  • the backlight brightness data processing apparatus may receive the PWM dimming signal from the PWM controller and determine whether the PWM dimming signal includes a preset hopping when acquiring each backlight luminance data, and detect PWM dimming.
  • the corresponding preset jump time is used as the reference time, and the interval time Sending a read command to the light sensor device and sampling corresponding backlight brightness data, where i is the number of received backlight brightness data, only one read command is sent in the dimming cycle, and only one backlight brightness is read. data. That is, the x data is acquired over multiple dimming cycles. It can be understood that, regardless of the response delay and other factors in the display device, the x sample data acquired according to the above two implementation manners are consistent under a certain duty cycle of the dimming cycle.
  • Step 302 Determine, according to the at least one backlight luminance data, current luminance data corresponding to the PWM dimming signal at the current duty ratio.
  • the current brightness data corresponding to the PWM dimming signal at the current duty ratio may be determined according to the acquired backlight brightness data. That is, in the When the backlight brightness data is obtained, the backlight brightness data processing device can use the acquired backlight brightness data as the current brightness data corresponding to the PWM dimming signal at the current duty ratio.
  • the backlight brightness data processing device may calculate an average value of the at least one backlight brightness data to obtain current brightness data corresponding to a current duty ratio of the PWM dimming signal. That is, the backlight luminance data processing device calculates the average value of the at least one backlight luminance data, and uses the calculated average value as the current luminance data corresponding to the current duty ratio of the PWM dimming signal.
  • the backlight luminance data processing device may increase the number of times the backlight luminance data is acquired, that is, obtain the first using at least one backlight luminance data.
  • the brightness data, and further the current brightness data corresponding to the PWM dimming signal at the current duty cycle is obtained from the first brightness data.
  • determining, according to the at least one backlight luminance data, current luminance data corresponding to the PWM dimming signal at the current duty ratio including:
  • the first brightness data is acquired according to the at least one backlight brightness data. It is determined whether the number of acquired first brightness data reaches a preset number. If the number of acquired first brightness data does not reach the preset number, the step of acquiring at least one backlight brightness data is performed again. If the number of the first brightness data that has been acquired reaches a preset number, the current brightness data corresponding to the PWM dimming signal at the current duty ratio is determined according to the acquired first brightness data.
  • the backlight brightness data processing device may calculate an average value of all or part of the data in the at least one backlight brightness data, and use the average value as a first brightness data.
  • the first brightness data After the first brightness data is obtained, it can be checked whether the number of the obtained first brightness data reaches a preset number. If not, the backlight brightness data processing device needs to continue to acquire the first brightness data, and The brightness data is obtained according to the at least one backlight brightness data. Therefore, the at least one backlight brightness data needs to be re-acquired.
  • step 301 is performed again, and the first brightness data is re-acquired according to the re-acquired at least one backlight brightness data.
  • the number of acquired first brightness data reaches a preset number.
  • the preset brightness data may be used to determine the current brightness data corresponding to the PWM dimming signal at the current duty ratio.
  • the backlight brightness data processing device only acquires one first brightness data, and the obtained first brightness data can be used as the PWM dimming signal at the current duty ratio. Current brightness data.
  • the backlight brightness data processing device may calculate an average value of the preset plurality of first brightness data to obtain current brightness data corresponding to the current duty ratio of the PWM dimming signal. That is, the backlight luminance data processing device calculates the average value of the preset first luminance data, and uses the calculated average value as the current luminance data corresponding to the current duty ratio of the PWM dimming signal.
  • each read command The delays sent to the photosensor device are not completely the same, resulting in a difference in the time each time the photosensor device receives the read command, which in turn causes the photosensor device to acquire the brightness data of the backlight at different times.
  • the accuracy of the current brightness data may be: when the first brightness data is acquired, the backlight brightness data with a larger value is selected in the acquired at least one backlight brightness data, and the first brightness is calculated by using the backlight brightness data with a larger value.
  • the data improves the accuracy of the first brightness data, thereby improving the accuracy of the current brightness data corresponding to the PWM dimming signal at the current duty cycle.
  • acquiring the first luminance data includes: selecting, in the at least one backlight luminance data, n backlight luminance data. The average value of the n backlight luminance data is calculated to obtain first luminance data.
  • the backlight luminance data of any one of the n backlight luminance data is not less than any one of the k backlight luminance data.
  • the k backlight luminance data is backlight luminance data other than n backlight luminance data in at least one backlight luminance data.
  • n is an integer greater than 0 and not greater than the total number of the at least one backlight luminance data, and k is an integer greater than or equal to zero.
  • the backlight brightness data may be selected from the at least one backlight brightness data acquired each time, and the average value of the n backlight brightness data is As the first brightness data.
  • the specific method for the backlight brightness data processing device to select n backlight brightness data from the at least one backlight brightness data may be: the backlight brightness data processing device according to the value of the at least one backlight brightness data, according to the value of the at least one backlight brightness data.
  • the sorting is performed from the largest to the smallest, so that the top n numerically large backlight luminance data is selected from the sorted at least one backlight luminance data.
  • the backlight brightness data processing device may also select n backlight brightness data in the at least one backlight brightness data by other means, which is not limited in the embodiment of the present disclosure.
  • the first brightness data can be obtained according to the maximum n backlight brightness data of the x backlight brightness data, so that the difference between the backlight brightness data used for calculating the first brightness data is small, and Increasing the accuracy of the current luminance data corresponding to the current duty cycle of the determined PWM dimming signal.
  • the backlight brightness data processing device acquires the backlight brightness data, it is necessary to send a read command to the photosensor device at a set time after determining that the received PWM dimming signal includes a preset jump, instead of randomly
  • the sending is such that the sending of the read command has a time basis, that is, the time for the backlight brightness data processing device to send the read command is more stable, so that the time for the optical sensor device to receive the read command is more stable, and the backlight of the light sensor device is obtained.
  • the brightness data is more stable, which makes the determined PWM dimming signal more accurate in the current brightness data corresponding to the current duty cycle, and improves the stability of the backlight brightness of the display device.
  • an embodiment of the present disclosure provides a method for processing backlight brightness data, including:
  • Step 401 Acquire first to xth backlight brightness data.
  • the obtaining the qth backlight luminance data includes: receiving a PWM dimming signal sent by the PWM controller; determining whether the received PWM dimming signal includes a preset transition; if included, setting the preset transition
  • the read command is sent to the photosensor device at a fixed time; and the backlight luminance data acquired by the photosensor device according to the read command is received.
  • the value of q is any value from 1 to x, and x is an integer greater than or equal to 1.
  • step 301 the step of receiving the PWM dimming signal sent by the PWM controller may be performed only once.
  • the backlight brightness data processing device receives the PWM dimming signal sent by the PWM controller, and the backlight brightness data processing device needs to first determine whether the PWM dimming signal is a full cycle PWM dimming signal.
  • the PWM dimming signal is a full-cycle PWM dimming signal. Since the backlight luminance data processing device does not receive the backlight luminance data, that is, the received backlight luminance data is 0, the formula is adopted. It can be determined that the read send command time is 0, that is, after the backlight brightness data processing device determines that the PWM dimming signal is a full cycle PWM dimming signal, the read command is sent to the photosensor device immediately.
  • the optical sensor device can read the brightness data of the backlight provided by the backlight module, that is, read the backlight brightness data, and send the read backlight brightness data to the backlight brightness data processing device.
  • the backlight brightness data processing device receives backlight brightness data acquired by the light sensor device.
  • the backlight luminance data processing device can acquire the first backlight luminance data.
  • the backlight brightness data processing device may update the number of received backlight brightness data, that is, update the number of received backlight brightness data to 1, and update the received data.
  • the number 1 of backlight luminance data is compared with the number 20 of backlight luminance data to be acquired. It is determined that the number of received backlight luminance data is less than the number of backlight luminance data 20 to be acquired, and the backlight luminance data processing device continues to acquire backlight luminance data.
  • the backlight luminance data processing device can continue to receive the PWM dimming signal sent by the PWM controller, and continue to determine whether the PWM dimming signal is a full cycle PWM modulation.
  • the optical signal is to detect whether the PWM dimming signal has rising and falling edges. If the PWM dimming signal has rising and falling edges, it can be determined that the PWM dimming signal is a full-cycle PWM dimming signal.
  • the backlight brightness data processing device can pass the formula according to the number of backlight luminance data that has been received by one.
  • the read send instruction time is And after determining that the PWM dimming signal has rising and falling edges, at intervals Sending a read command to the rear light sensor device, that is, waiting time
  • the read command is sent to the rear light sensor device.
  • the backlight luminance data acquired by the light sensor device according to the above read command is received.
  • the backlight luminance data processing device can acquire the second backlight luminance data.
  • the backlight brightness data processing device may update the number of received backlight luminance data, that is, update the number of received backlight luminance data to 2, and update the received data.
  • the number 2 of the backlight luminance data is compared with the number 20 of the backlight luminance data to be acquired, and it is determined that the number 2 of the received backlight luminance data does not reach the preset number of 20, and the backlight luminance data processing device continues to acquire the backlight luminance. Data until 20 backlight brightness data is acquired.
  • the backlight luminance data processing apparatus uses the preset transition time detected when acquiring the first backlight luminance data as the reference time, and sequentially intervals. A read command is sent to the photosensor device and the 2-20th backlight luminance data is sampled.
  • Step 402 Determine, according to the x backlight luminance data, current luminance data corresponding to the PWM dimming signal at the current duty ratio.
  • step 302 Reference may be made to step 302 above, and details are not described herein again.
  • the 20 backlight luminance data can be sorted according to the numerical value from the largest to the smallest, and the first two backlight luminance data are selected, that is, from 20 In the backlight brightness data, the values of the selected two backlight brightness data are not less than the values of the other 18 backlight brightness data.
  • the selected two backlight luminance data are averaged, and the calculated average value is used as the first first luminance data. It is determined whether the number of the first brightness data that has been acquired reaches a preset number, and the preset number is 10, and the number of the first brightness data obtained is 1 and the preset number 10 is not reached. It is necessary to continue to acquire the first brightness data.
  • the backlight brightness data processing device needs to re-execute the above step 401, re-acquire 20 backlight brightness data, and then obtain the second first brightness data according to the re-acquired 20 backlight brightness data, according to the above method until 10 pieces are acquired.
  • First brightness data After the 10 first brightness data are acquired, an average value of the 10 first brightness data may be calculated, and the average value is used as the current brightness data corresponding to the PWM dimming signal at the current duty ratio.
  • Step 403 Determine whether the current brightness data is equal to the target brightness data.
  • the brightness of the display component is preset, so that the brightness data of the backlight provided by the backlight module is also preset as the target brightness data.
  • the brightness data of the backlight provided by the backlight module is required to be the target brightness data.
  • the backlight luminance data processing device may compare the current luminance data with the target luminance data to determine whether the current luminance data is equal to the target luminance data.
  • the current brightness data when it is determined that the current brightness data is equal to the target brightness data, it indicates that the brightness of the backlight provided by the current backlight module is stable, and it is not necessary to adjust the duty ratio of the PWM dimming signal, and the following steps are not performed.
  • it is determined that the current brightness data is not equal to the target brightness data it indicates that the brightness of the backlight provided by the current backlight module is unstable, and the duty ratio of the PWM dimming signal needs to be adjusted, and the following steps are performed.
  • the current luminance data processing device calculates the current luminance data
  • the current luminance data is compared with the target luminance data, and if the current luminance data and the target luminance data are not equal, it is required to adjust the current occupation of the PWM dimming signal. Empty ratio, perform the following steps.
  • the target brightness data is acquired in advance.
  • the specific acquisition process is: adjusting the brightness of the display component of the display device to B0 by adjusting the duty ratio of the PWM dimming signal with the help of the external brightness detecting device before the display device leaves the factory.
  • the backlight brightness data processing device determines the brightness data corresponding to the current duty ratio of the PWM dimming signal by using the above steps 401-402, that is, determining the brightness data corresponding to the brightness of the display component of the display device adjusted to B0, and determining The brightness data is the target brightness data.
  • Step 404 If the current brightness data and the target brightness data are not equal, adjust the current duty ratio of the PWM dimming signal according to the current brightness data and the target brightness data.
  • the backlight brightness data processing device determines that the current brightness data is not equal to the target brightness data, it indicates that the brightness of the backlight provided by the current backlight module is not the preset brightness, and the brightness of the backlight provided by the backlight module needs to be adjusted. At this time, the backlight brightness data processing device can adjust the current duty ratio of the PWM dimming signal according to the relationship between the current brightness data and the target brightness data.
  • adjusting the current duty ratio of the PWM dimming signal according to the current brightness data and the target brightness data includes:
  • the duty cycle of the PWM dimming signal is increased.
  • the duty cycle of the PWM dimming signal is reduced.
  • the backlight brightness data processing device determines that the current brightness data is smaller than the target brightness data, it indicates that the brightness of the backlight provided by the current backlight module is too dark, and the brightness of the backlight provided by the backlight module needs to be improved.
  • the current PWM dimming signal can be reduced.
  • the duty ratio is used to reduce the time for the backlight module to be energized, thereby reducing the brightness of the backlight provided by the backlight module.
  • the backlight brightness data processing device performs the duty ratio adjustment of the PWM dimming signal, Adjusting the duty ratio of the PWM dimming signal in a small step size to prevent the backlight module from changing the brightness of the backlight according to the duty ratio of the adjusted PWM dimming signal too fast, causing the display device to be uncomfortable when viewed by the user. .
  • the backlight brightness data processing device can increase the current duty ratio of the PWM dimming signal, so as to increase the time for the backlight module to be energized, thereby improving The brightness of the backlight provided by the backlight module.
  • the duty ratio of the PWM dimming signal output by the PWM controller is a preset duty ratio
  • the brightness data of the backlight provided by the backlight module is smaller than Target brightness data
  • the duty ratio of the PWM dimming signal can be increased by the above steps 401-404, so that the brightness of the display device is stabilized to a preset brightness as soon as possible.
  • the display device is used for a long time, the backlight module is aging, and the brightness of the provided backlight is not the preset brightness.
  • the duty ratio of the PWM dimming signal can be adjusted through steps 401-404 to make the display device The brightness is stabilized at the preset brightness.
  • the backlight brightness data processing device obtains the backlight brightness data, it is determined that the received PWM dimming signal includes a preset jump, and is sent to the photosensor device at a set time after the preset jump.
  • Read command instead of random transmission, when the set time is the same, that is, the read command transmission time for sending the read command to the photosensor device is fixed time each time, the backlight brightness data read by the photo sensor device at a time It is the backlight brightness data in the same period of the dimming period, so that the current PWM data corresponding to the determined PWM dimming signal is more accurate at the current duty ratio, and the stability of the backlight brightness of the display device is improved.
  • the set time may be determined according to the number of backlight luminance data that has been received, each time the set time corresponding to the acquired backlight luminance data is different. That is, the light sensor device reads the backlight brightness data in different time periods, selects the first n backlight brightness data according to the numerical value from the largest to the smallest in the x backlight brightness data, and then obtains the first according to the n backlight brightness data.
  • the brightness data is obtained, and the first brightness data of the preset number is obtained by using the foregoing method, and the current brightness data corresponding to the PWM dimming signal at the current duty ratio is obtained according to the preset number of first brightness data.
  • the first luminance data is more accurate, thereby making the determined PWM dimming signal more current luminance data corresponding to the current duty ratio.
  • the accuracy of adjusting the current duty ratio of the PWM dimming signal is improved, and the brightness of the backlight module is adjusted by adjusting the current duty ratio of the PWM dimming signal in real time. Stable purpose.
  • FIG. 6 is a schematic structural diagram of an apparatus for acquiring backlight luminance data according to an embodiment of the present disclosure.
  • the apparatus 500 may include: at least one processor 501, and a memory. 502. Peripheral interface 503, input/output subsystem (I/O subsystem) 504, power line 505 and communication line 506.
  • I/O subsystem input/output subsystem
  • Memory 502 can include an operating system 512 and an acquisition backlight brightness routine 522.
  • the memory 502 may include a high-speed random access memory, a magnetic disk, a static random access memory (SRAM), a dynamic random access memory (DRAM), a read only memory (ROM), a flash memory, or a non-volatile memory. Volatile memory.
  • the memory 502 can store program code for the operating system 512 and the acquisition backlight brightness routine 522, that is, can include software modules, instruction set architectures, or a variety of data required for the actions of the device 500 that acquires backlight brightness. .
  • access of the other controllers such as the processor 501 or the peripheral device interface 503 and the memory 502 can be controlled by the processor 501.
  • the peripheral device interface 503 can combine the input and/or output peripherals of the device 500 that acquires backlight luminance data with the processor 501 and the memory 502. Also, input/output subsystem 504 can combine a variety of input/output peripherals with peripheral interface 503.
  • Power line 505 can supply power to all or part of the circuit components of the terminal device.
  • power line 505 can include more than one power source such as a power management system, battery or alternating current (AC), charging system, power failure detection circuit, power converter or inverter, power status tag Or any other circuit component used for power generation, management, and distribution.
  • a power management system such as a battery or alternating current (AC), charging system, power failure detection circuit, power converter or inverter, power status tag Or any other circuit component used for power generation, management, and distribution.
  • AC alternating current
  • Communication line 506 can communicate with other hosts using at least one interface.
  • the processor 501 can perform various functions of the device 500 for acquiring backlight luminance data and process the data by executing a software module or an instruction set architecture stored in the memory 502. That is, the processor 501 can be configured to process commands of a computer program by performing basic arithmetic, logic, and input/output calculations of a computer system.
  • the processor 501 is configured to perform the method of acquiring backlight luminance data in the above embodiment.
  • the device 500 for acquiring backlight luminance data is configured to acquire backlight luminance data, it is required to send a read command to the photosensor device at a set time after determining that the received PWM dimming signal includes a preset hopping. It is not randomly sent, so that the sending of the read command has a time basis, that is, the time for transmitting the read command for the device for acquiring the backlight brightness data is more stable, so that the time for the optical sensor device to receive the read command is more stable, and the optical sensor device is further stabilized.
  • the acquired backlight brightness data is more stable, thereby improving the stability of the backlight brightness of the display device.
  • FIG. 7 is a schematic structural diagram of a backlight luminance data processing apparatus according to an embodiment of the present disclosure.
  • the apparatus 600 may include: at least one processor 601 and a memory 602.
  • I/O subsystem input/output subsystem
  • Memory 602 can include an operating system 612 and backlight brightness data processing routine 622.
  • the memory 602 may include a high-speed random access memory, a magnetic disk, a static random access memory (SRAM), a dynamic random access memory (DRAM), a read only memory (ROM), a flash memory, or a non-volatile memory. Volatile Save.
  • the memory 602 can store program codes for the operating system 612 and the backlight brightness data processing routine 622, that is, can include software modules, instruction set architectures, or the like required for the actions of the backlight brightness data processing device 600. data. At this time, access of the other controllers such as the processor 601 or the peripheral device interface 603 and the memory 602 can be controlled by the processor 601.
  • Peripheral device interface 603 can combine the input and/or output peripherals of backlight brightness data processing device 600 with processor 601 and memory 602. Also, input/output subsystem 604 can combine a variety of input/output peripherals with peripheral interface 603.
  • Power line 605 can supply power to all or part of the circuit components of the terminal device.
  • power line 605 can include more than one power source such as a power management system, battery or alternating current (AC), a charging system, a power failure detection circuit, a power converter or inverter, and a power status flag. Or any other circuit component used for power generation, management, and distribution.
  • Communication line 606 can communicate with other hosts using at least one interface.
  • the processor 601 can perform various functions of the backlight luminance data processing device 600 and process the data by executing a software module or an instruction set architecture stored in the memory 602. That is, the processor 601 can be configured to process commands of a computer program by performing basic arithmetic, logic, and input/output calculations of the computer system.
  • the processor 601 is configured to perform the backlight luminance data processing method in the above embodiment.
  • the backlight brightness data processing device configured as described above obtains the backlight brightness data, it is determined that the received PWM dimming signal includes a preset jump, and is sent to the photosensor device at a set time after the preset jump.
  • the read command is not sent randomly, so that the current PWM data corresponding to the determined PWM dimming signal is more accurate at the current duty ratio, which improves the stability of the backlight brightness of the display device.
  • FIG. 8 is a block diagram of a liquid crystal display device 700 according to an exemplary embodiment.
  • an embodiment of the present disclosure provides a liquid crystal display device 700.
  • the liquid crystal display device 700 includes a display component 701, a backlight module 702 that provides a backlight for the display component 701, a backlight driving device 703, and PWM control.
  • the backlight module 702 is connected to the backlight driving device 703.
  • the PWM control device 704 is connected to the backlight driving device 703.
  • the photo sensor device 705 is disposed at the backlight module 702 and is connected to the processor 706.
  • Processor 706 is also coupled to PWM control device 704 and memory 707.
  • Memory 707 can include an operating system 712 and processing routine 722.
  • the memory 707 may include a high-speed random access memory, a magnetic disk, a static random access memory (SRAM), a dynamic random access memory (DRAM), a read only memory (ROM), a flash memory, or a non-volatile memory. Volatile memory.
  • Memory 707 can store program code for operating system 712 and processing routine 722, that is, can include software modules, instruction set architectures, or a variety of data required for the actions of liquid crystal display device 700. At this point, access by processor 706 or other components to memory 707 can be controlled by processor 706.
  • the processor 706 can perform various functions of the liquid crystal display device 700 and process data by executing a software module or an instruction set architecture stored in the memory 707. That is, the processor 706 can be configured to process commands for a computer program by performing basic arithmetic, logic, and input/output calculations of the computer system.
  • the processor 706 is configured to perform any of the processing methods of the above embodiments.
  • the backlight luminance data when the backlight luminance data is acquired, it is determined that the received PWM dimming signal includes a preset jump, and is sent to the optical sensor device at a set time after the preset jump.
  • the instruction rather than random transmission, further makes the determined PWM dimming signal more accurate at the current duty ratio corresponding to the current luminance data, thereby improving the stability of the backlight brightness of the display device.

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Abstract

La présente invention porte sur le domaine technique de l'affichage, et concerne un procédé d'obtention et de traitement de données de luminosité de rétroéclairage, et un dispositif d'affichage à cristaux liquides. Le procédé consiste : à recevoir un signal de gradation PWM envoyé par un contrôleur PWM (201) ; à déterminer si le signal de gradation PWM reçu comprend un saut prédéfini (202) ; si le signal de gradation PWM comprend le saut prédéfini, à envoyer une instruction de lecture à une unité de capteur optique dans le temps défini après le saut prédéfini (203) ; et à recevoir des données de luminosité de rétroéclairage obtenues par l'unité de capteur optique selon l'instruction de lecture (204). La solution permet d'améliorer la stabilité des données de luminosité de rétroéclairage.
PCT/CN2017/098406 2016-12-28 2017-08-22 Procédé et dispositif d'obtention et de traitement de données de luminosité de rétroéclairage, et dispositif d'affichage à cristaux liquides Ceased WO2018120861A1 (fr)

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CN107452344A (zh) 2017-08-18 2017-12-08 京东方科技集团股份有限公司 一种背光源的调节方法及装置
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