CN106782378B - Backlight brightness acquisition method and device, data processing method and device thereof and liquid crystal display device - Google Patents
Backlight brightness acquisition method and device, data processing method and device thereof and liquid crystal display device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0613—The adjustment depending on the type of the information to be displayed
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Abstract
The invention relates to a method and a device for acquiring backlight brightness and processing data thereof and liquid crystal display equipment, and relates to the technical field of display. The method comprises the following steps: receiving a PWM dimming signal sent by a PWM controller; judging whether the received PWM dimming signal comprises preset jump or not; if yes, sending a reading instruction to the optical sensing device at the set time after the preset jump; and receiving backlight brightness data acquired by the optical sensing device according to the reading instruction. The embodiment of the invention achieves the purpose of improving the stability of the acquired backlight brightness data.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method and a device for acquiring backlight brightness and processing data thereof and liquid crystal display equipment.
Background
The existing display device requires more and more accurate display of image content, and the accurate display of the image content of the display device needs to ensure the stable brightness of the display device.
As shown in fig. 1, the conventional display apparatus includes: a display module 101, a backlight module 102, a backlight driver device 103, a PWM (Pulse Width Modulation) controller 104, a photo sensor device 105, and a luminance data processor 106. The display component 101 is configured to receive and display an image. The backlight module 102 is used for providing a backlight source for the display module 101, so that the display module 101 displays an image. The backlight driving device 103 is used for providing a driving power supply for 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 backlight illumination for the display assembly 101. The brightness data processor 106 is configured to adjust a duty ratio of the PWM dimming signal provided by the PWM controller 104 according to the brightness data of the backlight source provided by the backlight module 102, which is acquired by the light sensing device 105, so that the backlight module 102 provides the backlight source with stable brightness for the display module 101.
At present, the display device realizes the backlight brightness stabilization of the backlight module 102 by the following method: the brightness data processor 106 sends a reading instruction to the light sensing device 105, and the light sensing device 105 receives the reading instruction, reads the brightness data of the backlight source provided by the backlight module 102, and sends the brightness data to the brightness data processor 106. In this way, the luminance data processor 106 obtains luminance data for a certain number of times, calculates average luminance data, compares the calculated average luminance data with target luminance data as current luminance data of the backlight module 102, and adjusts the duty ratio of the PWM dimming signal provided by the PWM controller 104 according to the comparison result so that the backlight luminance data of the backlight module 102 is the target luminance data.
However, in the prior art, whether the luminance data processor 106 sends the reading instruction to the photo-sensing device 105 is sent randomly. Thus, the sending time of each time the luminance data processor 106 sends the reading instruction to the photo-sensor device 105 is not exactly the same, which causes the sampling time point of the luminance data of the photo-sensor device 105 to change each time, as shown in fig. 2. Although the sampling integration time T of the luminance data of the photo-sensor device 105S0And TS1Equal to each other, but the on and off times of the backlight module 102 are different for each sampling integration time, resulting in the sampling integration time TS0And TS1In addition, the brightness data read by the photo sensor device 105 has a difference. Thus, the difference between the luminance data obtained by the luminance data processor 106 for a certain number of times is large, which results in the calculated current luminance data of the backlight module 102 being inaccurate, and if the current luminance data is different from the target luminance data, the luminance data processor 106 adjusts the duty ratio of the PWM dimming signal provided by the PWM controller 104 also being inaccurate, which results in the backlight luminance of the backlight module 102 becoming more unstable.
Disclosure of Invention
In order to overcome the problems in the related art, the invention provides a method and a device for acquiring backlight brightness and data processing thereof, and a liquid crystal display device.
According to a first aspect of the embodiments of the present invention, there is provided a method for obtaining backlight brightness, which is applied to a liquid crystal display device with a built-in photo sensor device, the method including: receiving a PWM dimming signal sent by a Pulse Width Modulation (PWM) controller; judging whether the received PWM dimming signal comprises preset jump or not; if yes, sending a reading instruction to the optical sensing device at the set time after the preset jump; and receiving backlight brightness data acquired by the optical sensing device according to the reading instruction.
According to a second aspect of the embodiments of the present invention, there is provided a backlight luminance data processing method, including acquiring at least one backlight luminance data, wherein acquiring any one of the backlight luminance data includes: acquiring any backlight brightness data by the method for acquiring backlight brightness in the embodiment; and determining the current brightness data corresponding to the PWM dimming signal under the current duty ratio according to the at least one piece of backlight brightness data.
According to a third aspect of the embodiments of the present invention, there is provided an apparatus for obtaining backlight luminance, including: the processor, the memory and the communication interface are connected with a communication bus; the communication interface is used for sending and receiving signals; the memory for storing program code; the processor is configured to read the program code stored in the memory, and execute the method for acquiring the backlight brightness according to the embodiment of the first aspect.
According to a fourth aspect of the embodiments of the present invention, there is provided a backlight luminance data processing apparatus including: the processor, the memory and the communication interface are connected with a communication bus; the communication interface is used for sending and receiving signals; the memory for storing program code; the processor is configured to read the program code stored in the memory and execute the processing method of the backlight brightness according to the embodiment of the second aspect.
According to a fifth aspect of embodiments of the present invention, there is provided a liquid crystal display device including: the display device comprises a display component, a backlight module for providing a backlight source for the display component, a backlight driver component, a PWM controller, a light sensing component and a processor; the processor comprises the device for acquiring the backlight brightness and the backlight brightness data processing device; the backlight module is connected with the backlight driver device; the PWM control device is connected with the backlight driver device; the light sensing device is arranged at the backlight module and is connected with the device for acquiring backlight brightness; the device for acquiring the backlight brightness is connected with the backlight brightness data processing device; the backlight brightness data processing device and the device for acquiring the backlight brightness are both connected with the PWM control device.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects: receiving a PWM dimming signal sent by a PWM controller, and judging whether the received PWM dimming signal comprises preset jump or not; if yes, sending a reading instruction to the optical sensing device at the preset time after the jump; and receiving backlight brightness data acquired by the optical sensing device according to the reading instruction. Therefore, when the device for acquiring the backlight brightness acquires the backlight brightness data each time, after the received PWM dimming signal is judged to include the preset jump, the read instruction is sent to the optical sensing device at the set time instead of being sent randomly, so that the time for sending the read instruction is provided with a time basis, that is, the time for sending the read instruction by the device for acquiring the backlight brightness is more stable, the time for receiving the read instruction by the optical sensing device is more stable, and further, the backlight brightness data acquired by the optical sensing device is more stable, thereby improving the stability of the backlight brightness of the display device.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a display device in the prior art;
FIG. 2 is a schematic diagram of the sampling time of luminance data of a prior art photo-sensing device;
fig. 3 is a flowchart illustrating a method for obtaining backlight brightness according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating another backlight luminance data processing method according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating another backlight luminance data processing method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an apparatus for obtaining backlight brightness according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a backlight brightness data processing apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 3 is a flowchart illustrating a method of obtaining backlight brightness according to an exemplary embodiment. The method is applied to the liquid crystal display device with the built-in optical sensing device. As shown in fig. 3, the method includes:
step 201, receiving a PWM dimming signal sent by a PWM controller.
Specifically, the PWM (Pulse Width Modulation) controller may periodically send the PWM dimming signal to the backlight luminance acquiring device, so that the backlight luminance acquiring device may know the duty ratio of the current PWM dimming signal. The device for acquiring the backlight brightness may receive a PWM dimming signal transmitted by the PWM controller.
Step 202, determining whether the received PWM dimming signal includes a preset jump.
Specifically, the brightness of the backlight source provided by the backlight module is determined by the duty ratio of the PWM dimming signal. Therefore, when adjusting the brightness of the backlight module, the current duty ratio of the PWM dimming signal needs to be adjusted. The adjustment of the duty ratio of the PWM dimming signal needs to determine how to adjust according to the luminance data of the backlight source provided by the backlight module. In order to ensure the stability of the brightness of the backlight source provided by the backlight module, the brightness data of the backlight source provided by the backlight module needs to be periodically detected, when the brightness data is not the target brightness data, it indicates that the brightness of the backlight source provided by the backlight module is changed, and the current duty ratio of the PWM dimming signal needs to be adjusted, so that the brightness data of the backlight source provided by the backlight module is the target brightness data again, and the purpose of stabilizing the brightness of the backlight source provided by the backlight module is achieved. For the above reasons, the device for acquiring the backlight brightness needs to acquire the brightness data of the backlight source provided by the backlight module.
In the prior art, the sending time of the reading instruction to the light sensing device is random and irregular. Therefore, the time for the light sensing device to receive the reading instruction is unstable, and the collected backlight brightness data are the backlight brightness data in different time of the PWM dimming cycle. In the embodiment of the present invention, in order to regularly send the reading instruction to the optical sensor device, it is necessary to set the time for sending the reading instruction. The set time of the read command needs a reference time, which is the starting timing time of the time of sending the read command. Since the device for acquiring the backlight brightness needs to send the reading instruction to the light sensing device for multiple times, the last reference time needs to be the same every time the reading instruction is sent to the light sensing device, so that the purpose that the time for the device for acquiring the backlight brightness to send the reading instruction to the light sensing device is stable, rather than random sending, can be achieved. Since the device for acquiring the backlight brightness may periodically receive the PWM dimming signal, a time when the received PWM dimming signal is detected to protect the preset jump may be used as the reference time.
At this time, after receiving the PWM dimming signal sent by the PWM controller, the device for obtaining the backlight brightness needs to detect whether the PWM dimming signal includes a preset jump.
Further, the preset jump includes: a rising edge transition of the signal and/or a falling edge transition of the signal.
At this time, determining whether the received PWM dimming signal includes a preset jump includes:
whether the received PWM dimming signal contains the rising edge jump of the signal and/or the falling edge jump of the signal is detected.
That is, when the preset transition includes a rising edge transition, the backlight luminance obtaining apparatus detects whether the PWM dimming signal has the rising edge transition after receiving the PWM dimming signal. And when the PWM dimming signal has rising edge jump, determining that the PWM dimming signal comprises preset jump. When the preset jump comprises a falling edge jump, the device for acquiring the backlight brightness detects whether the PWM dimming signal has the falling edge jump after receiving the PWM dimming signal. And when the PWM dimming signal has the falling edge jump, determining that the PWM dimming signal comprises the preset jump. When the preset jump comprises a rising edge jump and a falling edge jump, the device for acquiring the backlight brightness detects whether the PWM dimming signal has the rising edge jump and the falling edge jump after receiving the PWM dimming signal. And when the PWM dimming signal has rising edge jump and falling edge jump, determining that the PWM dimming signal comprises preset jump.
It should be noted that, when determining whether the PWM dimming signal includes the preset jump, the device for obtaining the backlight brightness may detect whether the received PWM dimming signal has the preset voltage change, that is, detect whether the PWM dimming signal has the voltage change corresponding to the rising edge jump and/or the voltage change corresponding to the falling edge jump. Of course, other manners may also be used to determine whether the PWM dimming signal includes the preset jump, which is not limited in the embodiment of the present invention.
For example, assume that the preset transition is a rising edge transition and a falling edge transition of the signal. After receiving the PWM dimming signal sent by the PWM controller, the device for obtaining the backlight brightness detects whether the PWM dimming signal includes a rising edge transition and a falling edge transition, that is, detects whether the PWM dimming signal is a dimming signal of a complete cycle. If the PWM dimming signal is detected to contain rising edge jump and falling edge jump, the PWM dimming signal can be determined to be a dimming signal of a complete period.
And 203, if the step is included, sending a reading instruction to the optical sensing device at the set time after the preset jump.
Specifically, after determining that the PWM dimming signal includes the preset jump, the device for obtaining the backlight brightness may use a time when the PWM dimming signal is detected to include the preset jump as a reference time, and start timing with the reference time and send a reading instruction to the optical sensing device after reaching the set time. That is, the device for obtaining backlight brightness sends a reading instruction to the light sensing device after detecting that the PWM dimming signal includes the preset jump at intervals of a set time.
Further, the set time for each backlight luminance data sending reading instruction may be the same. That is, each time the backlight brightness data is obtained, after it is determined that the received PWM dimming signal includes the preset jump, the read instruction is sent to the photo sensor device when the set time is reached. Therefore, the time for the device for acquiring the backlight brightness to send the reading instruction to the light sensing device each time is the same time period in the PWM dimming cycle, so that the time period for the light sensing device to acquire the backlight brightness data is the fixed time period in the PWM dimming cycle, and the stability of the backlight brightness data acquired by the light sensing device is high.
As described in the above example, after determining that the PWM dimming signal includes the rising edge transition and the falling edge transition, the apparatus for obtaining the backlight brightness may start timing by determining that the PWM dimming signal includes the rising edge transition and the falling edge transition, and send the read instruction to the light sensing device after the set time is reached.
And step 204, receiving the backlight brightness data acquired by the optical sensing device according to the reading instruction.
Specifically, after receiving the reading instruction, the optical sensor device may collect luminance data of the backlight source provided by the backlight module, that is, the backlight luminance data, and send the obtained backlight luminance data to the device for obtaining the backlight luminance. The backlight brightness device receives backlight brightness data acquired by the light sensing device according to the reading instruction.
As described in the above example, after receiving the reading instruction, the optical sensor device may collect luminance data of the backlight source provided by the backlight module, that is, the backlight luminance data, and send the obtained backlight luminance data to the device for obtaining backlight luminance. The device that acquires the backlight luminance may acquire backlight luminance data.
Therefore, when the device for acquiring the backlight brightness acquires the backlight brightness data each time, after the received PWM dimming signal is judged to include the preset jump, the read instruction is sent to the optical sensing device at the set time instead of being sent randomly, so that the time for sending the read instruction is provided with a time basis, that is, the time for sending the read instruction by the device for acquiring the backlight brightness is more stable, the time for receiving the read instruction by the optical sensing device is more stable, and further, the backlight brightness data acquired by the optical sensing device is more stable, thereby improving the stability of the backlight brightness of the display device.
As shown in fig. 4, an embodiment of the present invention provides a method for processing backlight luminance data, including:
step 301, at least one backlight brightness data is obtained.
Wherein acquiring any one of the backlight luminance data comprises: by the method for acquiring the backlight brightness described in the above embodiment, the backlight brightness data of any one of the above embodiments is acquired.
Specifically, the backlight luminance data processing apparatus needs to obtain at least one backlight luminance data, and when obtaining each backlight luminance data, the backlight luminance data can be obtained through the steps 201 and 204.
Further, when at least one backlight luminance data is obtained, the setting time in step 202 may be the same or different.
When the setting time is different, the setting time comprises the following steps: setting the time based on the received timeThe number of the backlight luminance data of (1) is calculated by using a formulaAnd (4) determining.
Wherein, TPWMFor the period of the PWM dimming signal, x is the number of at least one backlight luminance data, and i is the number of received backlight luminance data.
That is, the set time is the number of the backlight brightness data that have been received before the backlight brightness data processing device sends the reading instruction, and the formula is usedAnd (4) calculating. Therefore, each time the reading instruction sent by the backlight brightness data processing device corresponds to the sending time of different reading instructions, so that the light sensing device can read the backlight brightness data at different times. By the formulaThe period of the PWM dimming signal may be divided into x time periods, the backlight luminance data processing device obtains the backlight luminance data in different time periods of the period of the PWM dimming signal, that is, the backlight luminance data processing device divides the period of the PWM dimming signal into at least one time period, and the backlight luminance data processing device obtains the backlight luminance data once in each time period, thereby obtaining at least one backlight luminance data.
Or, considering that there is a delay time between the PWM controller providing the PWM signal and the backlight module providing the backlight source, the setting time includes: the setting time is determined by the number of the received backlight brightness data and using a formulaAnd (4) determining.
Wherein, Delta TcThe time delay between the PWM controller providing the PWM signal and the backlight source provided by the backlight module is shown.
Thus, the backlight brightness data processing device can obtain the q-th backlight brightness numberWhen the received PWM dimming signal sent by the PWM controller is detected to include the preset jump, the sending time of the reading instruction corresponding to the q-th backlight brightness data is the set timeOr,thus, the backlight brightness data processing device can determine the interval time after the PWM dimming signal comprises the preset jumpOr, interval of time
The optical sensing device sends a reading instruction, at this time, the optical sensing device can send the acquired backlight brightness data to the backlight brightness data processing device, and the backlight brightness data processing device can acquire the q-th backlight brightness data. Wherein the q-th backlight luminance data is any one of at least one backlight luminance data.
Step 302, determining current brightness data corresponding to the PWM dimming signal at the current duty ratio according to the at least one backlight brightness data.
Specifically, after the backlight luminance data processing device acquires at least one piece of backlight luminance data, the current luminance data corresponding to the PWM dimming signal at the current duty ratio may be determined according to the number of the acquired backlight luminance data. That is, when acquiring one piece of backlight luminance data, the backlight luminance data processing device may use the acquired piece of backlight luminance data as current luminance data corresponding to the PWM dimming signal at the current duty ratio.
When the at least two backlight brightness data are obtained, the backlight brightness data processing device may calculate an average value of the at least two backlight brightness data, so as 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 an average value of at least two pieces of backlight luminance data, and uses the calculated average value as current luminance data corresponding to the current duty ratio of the PWM dimming signal.
Further, in order to increase the accuracy of the current luminance data corresponding to the PWM dimming signal at the current duty ratio, the backlight luminance data processing apparatus may increase the number of times of obtaining the backlight luminance data, that is, obtain the first luminance data by using at least one backlight luminance data, and further obtain the current luminance data corresponding to the PWM dimming signal at the current duty ratio from the first luminance data.
At this time, determining current brightness data corresponding to the PWM dimming signal at the current duty ratio according to at least one backlight brightness data includes:
and acquiring first brightness data according to at least one piece of backlight brightness data. And judging whether the number of the acquired first brightness data reaches a preset number. And if the number of the acquired first brightness data does not reach the preset number, re-executing to acquire at least one backlight brightness data. And if the number of the acquired first brightness data reaches the preset number, determining the current brightness data corresponding to the PWM dimming signal under the current duty ratio according to the acquired first brightness data.
That is, after acquiring the at least one backlight luminance data, the backlight luminance data processing device may calculate an average value of all or part of the at least one backlight luminance data, and use the average value as one first luminance data. After the first luminance data is obtained, whether the number of the first luminance data obtained by the obtaining device reaches a preset number or not can be checked, if not, the backlight luminance data processing device needs to continuously obtain the first luminance data, and since the first luminance data is obtained according to at least one backlight luminance data, at least one backlight luminance data needs to be obtained again, at this moment, the step 301 needs to be executed again, and then the first luminance data is obtained again according to at least one backlight luminance data obtained again until the number of the obtained first luminance data reaches the preset number. When the number of the acquired first brightness data reaches the preset number, the preset number of the first brightness data can be utilized to determine the current brightness data corresponding to the PWM dimming signal under the current duty ratio.
When the preset number is 1, the backlight brightness data processing device only acquires one first brightness data, and at this time, the acquired first brightness data may be used as the current brightness data corresponding to the PWM dimming signal at the current duty ratio.
When the preset number is an integer greater than 1, the backlight brightness data processing device may calculate an average value of the preset number of first brightness data to obtain current brightness data corresponding to the current duty ratio of the PWM dimming signal. That is, the backlight brightness data processing device calculates an average value of a preset number of first brightness data, and uses the calculated average value as current brightness data corresponding to the current duty ratio of the PWM dimming signal.
Furthermore, because there is a delay in the process of sending the reading instruction to the light sensing device, the delay in sending the reading instruction to the light sensing device each time is not completely the same, so that there is a difference in the time for the light sensing device to receive the reading instruction each time, and further, the time for the light sensing device to acquire the luminance data of the backlight source is different. However, in the liquid crystal display device, the difference between the maximum values of the luminance data of the backlight sources in different PWM dimming periods is small, and therefore, in order to improve the accuracy of the current luminance data corresponding to the determined PWM dimming signal at the current duty ratio, when the first luminance data is acquired each time, the backlight luminance data with a large value may be selected from the acquired at least one backlight luminance data, and the first luminance data is calculated by using the backlight luminance data with the large value, so as to improve the accuracy of the first luminance data, and further improve the accuracy of the current luminance data corresponding to the PWM dimming signal at the current duty ratio.
At this time, acquiring the first luminance data according to the at least one backlight luminance data includes: and selecting n backlight brightness data from the at least one backlight brightness data. And calculating the average value of the n backlight brightness data to obtain first brightness data.
Wherein, any backlight brightness data in the n backlight brightness data is not less than any backlight brightness data in the k backlight brightness data. The k pieces of backlight luminance data are backlight luminance data other than the n pieces of backlight luminance data among the at least one piece of 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 0.
In order to further increase the stability of the first luminance data, the backlight luminance data processing apparatus may select n backlight luminance data having a large value from at least one backlight luminance data acquired each time, and use an average value of the n backlight luminance data as the first luminance data.
Further, a specific method for selecting n backlight luminance data from the at least one backlight luminance data by the backlight luminance data processing device may be that the backlight luminance data processing device sorts the at least one backlight luminance data according to a numerical value of the at least one backlight luminance data in a descending order of the numerical value, so as to select the first n backlight luminance data with a large numerical value from the sorted at least one backlight luminance data.
It should be noted that the backlight luminance data processing apparatus may also select n pieces of backlight luminance data from at least one piece of backlight luminance data in other ways, which is not limited in this embodiment of the present invention.
In this way, the first luminance data can be obtained according to the largest n backlight luminance data of the x backlight luminance data each time, so that the difference between the backlight luminance data used for calculating the first luminance data each time is small, and the accuracy of the current luminance data corresponding to the determined current duty ratio of the PWM dimming signal can be improved.
Therefore, when the backlight brightness data processing device acquires the backlight brightness data each time, after the received PWM dimming signal is judged to include the preset jump, the reading instruction is sent to the light sensing device at the set time instead of being sent randomly, so that the time for sending the reading instruction is provided with a time basis, that is, the time for sending the reading instruction by the backlight brightness acquiring device is more stable, the time for receiving the reading instruction by the light sensing device is more stable, the backlight brightness data acquired by the light sensing device is more stable, the current brightness data corresponding to the determined PWM dimming signal at the current duty ratio is more accurate, and the stability of the backlight brightness of the display device is improved.
As shown in fig. 5, an embodiment of the present invention provides a method for processing backlight luminance data, including:
step 401, first to xth backlight brightness data are obtained.
Wherein, obtaining the q-th backlight brightness data comprises: receiving a PWM dimming signal sent by a PWM controller; judging whether the received PWM dimming signal comprises preset jump or not; if yes, sending a reading instruction to the optical sensing device at the preset time after the preset jump; and receiving backlight brightness data acquired by the optical sensing device according to the reading instruction. The value of q is any one of 1 to x, and x is an integer greater than or equal to 1.
Specifically, refer to step 301, which is not described herein again.
For example, it is assumed that the set reading instruction corresponding to each time of acquiring the backlight luminance data is different, and the sending time of the reading instruction is determined by using a formula according to the number of the received backlight luminance dataAnd (4) setting. If the backlight brightness data processing device needs to obtain 20 pieces of backlight brightness data. At this time, the backlight luminance data processing means can acquire 20 pieces of backlight luminance data by the following steps. When the 1 st backlight brightness data is obtained, the backlight brightness data processing device receives a PWM dimming signal sent by PWM control, at this time, the backlight brightness data processing device needs to first determine whether the PWM dimming signal is a PWM dimming signal of a complete cycle, that is, to detect whether the PWM dimming signal has a rising edge and a falling edge, and if the PWM dimming signal has a rising edge and a falling edge, it may be determined that the PWM dimming signal is a PWM dimming signal of a complete cycle. The backlight brightness data processing device does not receive the backlight brightness data, namely the received backlight brightness numberWhen the value is 0, the value is obtained by the formulaThe time for reading and sending the instruction can be determined to be 0, that is, after the backlight brightness data processing device determines that the PWM dimming signal is a complete-period PWM dimming signal, the reading instruction is sent to the light sensing device immediately. After receiving the reading instruction, the optical sensing device can read the brightness data of the backlight source provided by the backlight module, namely 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 the backlight brightness data acquired by the light sensing device. At this time, the backlight luminance data processing device may acquire the 1 st backlight luminance data. After acquiring the 1 st backlight brightness data, the backlight brightness data processing device may update the number of the received backlight brightness data, that is, update the number of the received backlight brightness data to 1, and compare the updated number 1 of the received backlight brightness data with the number 20 of the backlight brightness data to be acquired. And judging that the number of the received backlight brightness data is less than 20 of the number of the backlight brightness data to be acquired, and continuing to acquire the backlight brightness data by the backlight brightness data processing device.
That is, the backlight brightness data processing device receives the PWM dimming signal sent by the PWM control, and continuously determines whether the PWM dimming signal is a PWM dimming signal of a complete cycle, that is, detects whether the PWM dimming signal has a rising edge and a falling edge, and if the PWM dimming signal has a rising edge and a falling edge, it may be determined that the PWM dimming signal is a PWM dimming signal of a complete cycle. The backlight brightness data processing device can receive the number 1 of the backlight brightness data through a formulaIt can be determined that the read send command time isAnd after determining that the PWM dimming signal has a rising edge and a falling edge, at an interval timeSending a reading instruction to the optical sensing device, namely waiting timeAnd sending a reading instruction to the light sensing device. And receiving the backlight brightness data acquired by the light sensing device according to the reading instruction. At this time, the backlight luminance data processing device may acquire the 2 nd backlight luminance data. After the backlight brightness data processing device acquires the 2 nd backlight brightness data, the number of the received backlight brightness data can be updated, that is, the number of the received backlight brightness data is updated to 2, the updated number 2 of the received backlight brightness data is compared with the number 20 of the backlight brightness data to be acquired, it is judged that the number 2 of the received backlight brightness data does not reach the preset number 20, and the backlight brightness data processing device continues to acquire the backlight brightness data until 20 backlight brightness data are acquired.
And step 402, determining current brightness data corresponding to the PWM dimming signal under the current duty ratio according to the x pieces of backlight brightness data.
Specifically, refer to step 302 above, and will not be described herein again.
As described in the above example, after the backlight luminance data processing apparatus obtains 20 pieces of backlight luminance data, the backlight luminance data processing apparatus may sort the 20 pieces of backlight luminance data in order of magnitude, and select the first two pieces of backlight luminance data, that is, the values of the selected 2 pieces of backlight luminance data are not less than the values of the other 18 pieces of backlight luminance data from the 20 pieces of backlight luminance data. And calculating the average value of the selected 2 backlight brightness data, and taking the calculated average value as the 1 st first brightness data. And judging whether the number of the acquired first brightness data reaches a preset number, assuming that the preset number is 10, and continuing to acquire the first brightness data when the number of the acquired first brightness data does not reach the preset number of 10 because the number of the acquired first brightness data is 1. At this time, the backlight luminance data processing apparatus needs to re-execute the step 401, re-acquire 20 pieces of backlight luminance data, further acquire the 2 nd first luminance data according to the re-acquired 20 pieces of backlight luminance data, and acquire 10 pieces of first luminance data according to the method. After the 10 pieces of first brightness data are obtained, an average value of the 10 pieces of first brightness data may be calculated, and the average value is used as current brightness data corresponding to the PWM dimming signal at the current duty ratio.
Step 403, determining whether the current luminance data is equal to the target luminance data.
Specifically, when the display device leaves the factory, the brightness of the display module is preset, and thus, the preset brightness data of the backlight source provided by the backlight module is the target brightness data. In order to stabilize the brightness of the display module of the display device at the preset brightness, the brightness data of the backlight source provided by the backlight module is required to be the target brightness data. After calculating the current luminance data corresponding to the PWM dimming signal at the current duty ratio, the backlight luminance data processing apparatus may compare the current luminance data with the target luminance data, and determine whether the current luminance data is equal to the target luminance data.
Further, when the current brightness data is judged to be equal to the target brightness data, it is indicated that the brightness of the backlight source provided by the current backlight module is stable, the duty ratio of the PWM dimming signal does not need to be adjusted, and the following steps are not executed. When the current brightness data is judged to be not equal to the target brightness data, the backlight source brightness provided by the current backlight module is not stable, the duty ratio of the PWM dimming signal needs to be adjusted, and the following steps are executed.
As described in the above example, after the backlight 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 is not equal to the target luminance data, it indicates that the current duty ratio of the PWM dimming signal needs to be adjusted, and the following steps are performed.
Note that the target luminance data is acquired in advance. The specific acquisition process comprises the following steps: before the display device leaves factory, with the help of external brightness detection device, the PWM is adjusted to adjust lightDuty ratio of signal, adjusting brightness of display component of display device to B0. The backlight brightness data processing device determines the brightness data corresponding to the current duty ratio of the PWM dimming signal through the steps 401 and 402, that is, determines that the brightness of the display module of the display device is adjusted to B0And determining the brightness data as the target brightness data according to the corresponding brightness data.
And step 404, if the current brightness data is not equal to 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.
Specifically, when the backlight luminance data processing device determines that the current luminance data is not equal to the target luminance data, it indicates that the luminance of the backlight source provided by the backlight module is not the preset luminance, and the luminance of the backlight source provided by the backlight module needs to be adjusted. At this time, the backlight luminance data processing apparatus may adjust the current duty ratio of the PWM dimming signal according to a relationship between the current luminance data and the target luminance data.
That is, if the current luminance data is not equal to the target luminance data, adjusting the current duty ratio of the PWM dimming signal according to the current luminance data and the target luminance data includes:
and if the current brightness data is less than the target brightness data, increasing the duty ratio of the PWM dimming signal.
And if the current brightness data is larger than the target brightness data, reducing the duty ratio of the PWM dimming signal.
That is to say, when 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 source provided by the backlight module is too dark, and the brightness of the backlight source provided by the backlight module needs to be improved.
When the current brightness data is larger than the target brightness data, the brightness of the backlight source provided by the current backlight module is over-bright, the brightness of the backlight source provided by the backlight module needs to be reduced, and at the moment, the current duty ratio of the P PWM dimming signal can be reduced, so that the power-on time of the backlight module is reduced, and the brightness of the backlight source provided by the backlight module is further reduced.
Furthermore, when the duty ratio of the PWM dimming signal is adjusted, the backlight brightness data processing apparatus can adjust the duty ratio of the PWM dimming signal with a small step length, so as to prevent the backlight module from providing too fast brightness change of the backlight source according to the adjusted duty ratio of the PWM dimming signal, which causes discomfort to the eyes of the display device when the user watches the backlight module.
As described in the above example, if the backlight luminance data processing device determines that the current luminance data is smaller than the target luminance data, the backlight luminance data processing device may increase the current duty ratio of the PWM dimming signal, so as to increase the power-on time of the backlight module, thereby increasing the luminance of the backlight source provided by the backlight module.
It should be noted that, when the display device is just started up, due to the influence of temperature and the like, when the duty ratio of the PWM dimming signal output by the PWM controller is the preset duty ratio, the luminance data of the backlight source provided by the backlight module is smaller than the target luminance data, and at this time, the duty ratio of the PWM dimming signal can be increased through the above step 401 and step 404, so as to achieve that the luminance of the display device is stabilized to the preset luminance as soon as possible.
It should be noted that, if the display device is used for a long time, the backlight module is aged, so that the brightness of the provided backlight source is not the preset brightness, and the duty ratio of the PWM dimming signal can be adjusted through steps 401 and 404, so that the brightness of the display device is stabilized at the preset brightness.
Therefore, when the backlight brightness data processing device acquires the backlight brightness data each time, the backlight brightness data processing device sends the reading instruction to the light sensing device at the preset time after the preset jump instead of sending the reading instruction randomly after judging that the received PWM dimming signal comprises the preset jump, and when the set time is the same, namely the sending time of the reading instruction sending the reading instruction to the light sensing device each time is the fixed time, the backlight brightness data read by the light sensing device each time is the backlight brightness data in the same time period of the dimming cycle, so that the current brightness data corresponding to the determined PWM dimming signal under the current duty ratio is more accurate, and the stability of the backlight brightness of the display device is improved.
The setting time corresponding to each acquisition of the backlight brightness data is different, and the setting time is determined according to the number of the received backlight brightness data. The backlight brightness data under different time periods are read by the light sensing device, the first n backlight brightness data are selected from the x backlight brightness data according to the numerical value from large to small, the first brightness data are obtained according to the n backlight brightness data, the first brightness data with the preset number can be obtained by the method, and the current brightness data corresponding to the PWM dimming signal under the current duty ratio are obtained according to the first brightness data with the preset number. The difference between n backlight brightness data among any one first brightness data is calculated to be small, so that the first brightness data is more accurate, the current brightness data corresponding to the determined PWM dimming signal under the current duty ratio is more accurate, when the current brightness data is not equal to the target brightness data, the accuracy of adjusting the current duty ratio of the PWM dimming signal is improved, and the purpose of stabilizing the brightness of the backlight module by adjusting the current duty ratio of the PWM dimming signal in real time is achieved.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Referring to fig. 6, a schematic structural diagram of an apparatus for obtaining backlight brightness according to an embodiment of the present invention is shown, and as shown in fig. 6, the apparatus 500 may include: at least one processor (processor)501, memory 502, peripheral interface 503, input/output subsystem (I/O subsystem)504, power lines 505, and communication lines 506.
The memory 502 may include an operating system 512 and a get backlight brightness routine 522. For example, memory 502 may include a high-speed random access memory (high-speed random access memory), a magnetic disk, a static random access memory (SPAM), a Dynamic Random Access Memory (DRAM), a Read Only Memory (ROM), a flash memory, or a non-volatile memory. The memory 502 may store program code for the operating system 512 and the get backlight brightness routine 522, that is, may include software modules, instruction set architectures, or a variety of data beyond that required for the operation of the device 500 to get backlight brightness. In this case, the access to the memory 502 and other controllers such as the processor 501 and the peripheral interface 506 may be controlled by the processor 501.
The peripherals interface 503 may combine input and/or output peripherals of the apparatus 500 for obtaining backlight brightness with the processor 501 and the memory 502. Also, input/output subsystem 504 may combine a variety of input/output peripherals with peripheral interface 506.
The power line 505 may supply power to all or part of the circuit elements of the terminal device. For example, the power line 505 may include, for example, a power management system, a battery or one or more power sources for Alternating Current (AC), a charging system, a power failure detection circuit (power failure detection circuit), a power converter or inverter, a power status marker, or any other circuit element for power generation, management, distribution.
The communication line 506 may utilize at least one interface to communicate with other hosts.
The processor 501 may perform various functions of the apparatus 500 for obtaining backlight brightness and process data by executing a software module or an instruction set architecture stored in the memory 502. That is, the processor 501 is configured to process commands of a computer program by performing basic arithmetic, logic, and input/output operations of the computer system.
The processor 501 is configured to execute the method of acquiring the backlight brightness in the above embodiment.
When the device 500 for acquiring backlight brightness configured as described above acquires backlight brightness data each time, it is necessary to send a read instruction to the light sensing device at a set time instead of sending the read instruction randomly after determining that the received PWM dimming signal includes a preset jump, so that sending the read instruction has a time basis, that is, the time for sending the read instruction by the device for acquiring backlight brightness is more stable, the time for receiving the read instruction by the light sensing device is more stable, and further, the backlight brightness data acquired by the light sensing device is more stable, thereby improving the stability of the backlight brightness of the display device.
Referring to fig. 7, which is a schematic structural diagram of a backlight brightness data processing apparatus according to an embodiment of the present invention, as shown in fig. 7, the apparatus 600 may include: at least one processor (processor)601, memory 602, peripheral interface 603, input/output subsystem 604, power lines 605, and communication lines 606.
The memory 602 may include an operating system 612 and a backlight brightness data processing routine 622. For example, the memory 602 may include a high-speed random access memory (high-speed random access memory), a magnetic disk, a static random access memory (SPAM), a Dynamic Random Access Memory (DRAM), a Read Only Memory (ROM), a flash memory, or a non-volatile memory. The memory 602 may store program code for the operating system 612 and the backlight brightness data processing routine 622, that is, may include software modules, instruction set architectures, or a variety of data other than those required for the operation of the backlight brightness data processing apparatus 600. In this case, the access to the memory 602 and other controllers such as the processor 601 and the peripheral interface 606 may be controlled by the processor 601.
The peripherals interface 603 may combine input and/or output peripherals of the backlight brightness data processing apparatus 600 with the processor 601 and the memory 602. Also, the input/output subsystem 604 may combine a variety of input/output peripherals with the peripheral interface 606.
The power line 605 may supply power to all or part of the circuit elements of the terminal device. For example, the power line 605 may include, for example, a power management system, a battery or one or more power supplies for Alternating Current (AC), a charging system, a power failure detection circuit (power failure detection circuit), a power converter or inverter, a power status marker, or any other circuit element for power generation, management, distribution.
The communication line 606 may utilize at least one interface to communicate with other hosts.
The processor 601 may perform various functions of the backlight brightness data processing apparatus 600 and process data by executing software modules or instruction set architectures 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 operations of a computer system.
The processor 601 is configured to execute the backlight luminance data processing method in the above-described embodiment.
When the backlight brightness data processing device with the structure acquires the backlight brightness data each time, after the received PWM dimming signal is judged to include the preset jump, the reading instruction is sent to the light sensing device at the set time after the preset jump instead of being sent randomly, when the set time is the same, namely the sending time of the reading instruction sending the reading instruction to the light sensing device each time is the fixed time, the backlight brightness data read by the light sensing device each time is the backlight brightness data in the same time period of the dimming cycle, so that the current brightness data corresponding to the determined PWM dimming signal under the current duty ratio is more accurate, and the stability of the backlight brightness of the display device is improved.
In addition, fig. 8 is a block diagram illustrating a liquid crystal display device 700 according to an exemplary embodiment. As shown in fig. 8, an embodiment of the present invention provides a liquid crystal display device 700, where the liquid crystal display device 700 includes: a display module 701, a backlight module 702 for providing a backlight source for the display module 701, a backlight driver device 703, a PWM controller 704, a photo sensor device 705 and a processor 706.
The processor 706 includes the device 500 for acquiring backlight brightness and the backlight brightness data processing device 600 described in the above embodiments. The backlight module 702 is connected to the backlight driver device 703. The PWM control device 704 is connected 703 to the backlight driver device. The light sensor 705 is disposed at the backlight module 702 and connected to the device 500 for obtaining backlight brightness. The device 500 for acquiring backlight brightness is connected with the backlight brightness data processing device 600. The backlight brightness data processing device 600 and the device 500 for obtaining backlight brightness are connected with the PWM control device 504.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in a plurality of software and/or hardware when implementing the invention.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A method for obtaining backlight brightness is applied to a liquid crystal display device with a built-in optical sensing device, and the method comprises the following steps:
receiving a PWM dimming signal sent by a Pulse Width Modulation (PWM) controller;
judging whether the received PWM dimming signal comprises preset jump or not, wherein the preset jump comprises: a rising edge transition of the signal and/or a falling edge transition of the signal;
if yes, sending a reading instruction to the optical sensing device at the set time after the preset jump;
and receiving backlight brightness data acquired by the optical sensing device according to the reading instruction.
2. The method of claim 1,
the judging whether the received PWM dimming signal includes a preset jump includes:
and detecting whether the received PWM dimming signal contains a rising edge jump of the signal and/or a falling edge jump of the signal.
3. A backlight brightness data processing method is characterized by comprising the following steps:
acquiring at least one backlight brightness data, wherein acquiring any one of the backlight brightness data comprises: acquiring any one of the backlight brightness data by the method for acquiring backlight brightness according to any one of claims 1 or 2;
and determining the current brightness data corresponding to the PWM dimming signal under the current duty ratio according to the at least one piece of backlight brightness data.
4. The method according to claim 3, wherein determining the current brightness data corresponding to the PWM dimming signal at the current duty cycle according to the at least one backlight brightness data comprises:
acquiring first brightness data according to the at least one backlight brightness data;
judging whether the number of the acquired first brightness data reaches a preset number or not;
if the number of the acquired first brightness data does not reach the preset number, re-executing to acquire at least one backlight brightness data;
and if the number of the acquired first brightness data reaches a preset number, determining the current brightness data corresponding to the PWM dimming signal under the current duty ratio according to the acquired first brightness data.
5. The method of claim 4, wherein obtaining first luminance data according to the at least one backlight luminance data comprises:
selecting n backlight brightness data from the at least one backlight brightness data; wherein, the numerical value of any one of the n backlight brightness data is not less than the numerical value of any one of the k backlight brightness data; the k pieces of backlight brightness data are other backlight brightness data except the n pieces of backlight brightness data in the at least one piece of backlight brightness data;
and calculating the average value of the n backlight brightness data to obtain the first brightness data.
6. The method of claim 4 or 5, wherein the setting the time comprises:
the set time is determined by the number of the received backlight brightness data and using a formulaDetermining; wherein, TPWMFor the period of the PWM dimming signal, x is the number of the at least one backlight luminance data, and i is the number of the received backlight luminance data.
7. The method of claim 4 or 5, wherein the setting the time comprises:
the set time is determined by the number of the received backlight brightness data and using a formulaDetermining; wherein, Delta TcThe time delay T between the PWM controller providing PWM signal and the backlight source provided by the backlight modulePWMFor the period of the PWM dimming signal, x is the number of the at least one backlight luminance data, and i is the number of the received backlight luminance data.
8. An apparatus for obtaining backlight brightness, comprising: the processor, the memory and the communication interface are connected with a communication bus;
the communication interface is used for sending and receiving signals;
the memory for storing program code;
the processor for reading the program code stored in the memory and executing the method of any of claims 1 to 2.
9. A backlight luminance data processing apparatus, comprising: the processor, the memory and the communication interface are connected with a communication bus;
the communication interface is used for sending and receiving signals;
the memory for storing program code;
the processor configured to read the program code stored in the memory and execute the method according to any one of claims 3 to 7.
10. A liquid crystal display device, comprising: the display device comprises a display component, a backlight module for providing a backlight source for the display component, a backlight driver component, a PWM controller, a light sensing component and a processor; wherein, the processor comprises the device for acquiring backlight brightness according to claim 8 and the backlight brightness data processing device according to claim 9;
the backlight module is connected with the backlight driver device;
the PWM controller is connected with the backlight driver device;
the light sensing device is arranged at the backlight module and is connected with the device for acquiring the backlight brightness;
the device for acquiring the backlight brightness is connected with the backlight brightness data processing device;
the backlight brightness data processing device and the device for acquiring the backlight brightness are both connected with the PWM controller.
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| PCT/CN2017/098406 WO2018120861A1 (en) | 2016-12-28 | 2017-08-22 | Method and device for obtaining and processing backlight brightness data, and liquid crystal display device |
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| CN107452344A (en) * | 2017-08-18 | 2017-12-08 | 京东方科技集团股份有限公司 | The adjusting method and device of a kind of backlight |
| CN110648634B (en) * | 2018-06-26 | 2021-04-23 | 青岛海信医疗设备股份有限公司 | Backlight brightness determining and adjusting method and device, storage medium and electronic equipment |
| CN109801601B (en) | 2019-03-21 | 2020-11-03 | 京东方科技集团股份有限公司 | Backlight driving method, control circuit and display device |
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| CN101777322B (en) * | 2010-01-21 | 2012-05-30 | 四川长虹电器股份有限公司 | Liquid crystal display television system |
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