CN112233626A - Backlight adjusting device, backlight adjusting method and display device - Google Patents
Backlight adjusting device, backlight adjusting method and display device Download PDFInfo
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- CN112233626A CN112233626A CN202011184210.2A CN202011184210A CN112233626A CN 112233626 A CN112233626 A CN 112233626A CN 202011184210 A CN202011184210 A CN 202011184210A CN 112233626 A CN112233626 A CN 112233626A
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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
- G09G3/3413—Details of control of colour illumination sources
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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
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Abstract
The application discloses a backlight adjusting device, a backlight adjusting method and a display device, wherein the backlight adjusting device comprises an ambient light sensor, a light source and a light source module, wherein the ambient light sensor is used for receiving ambient light and generating an ambient light signal; the microprocessor is connected with the ambient light sensor and used for acquiring an ambient light signal; and the time schedule controller is connected with the microprocessor and controls a first pulse width modulation signal output by the time schedule controller to be input to the microprocessor after the ambient light signal, wherein the microprocessor generates a second pulse width modulation signal according to the ambient light signal and the first pulse width modulation signal, and the second pulse width modulation signal is used for controlling backlight brightness. The backlight adjusting device can adjust the pulse width modulation signal according to the ambient light brightness when the system is started, so that backlight is adjusted, and backlight adjustment can be completed before the screen is lightened in backlight, so that the screen brightness is matched with the ambient light when the system is started.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a backlight adjusting device, a backlight adjusting method and a display device.
Background
Liquid Crystal Displays (LCDs) are widely used in electronic devices such as high-definition digital televisions and desktop computers because of their advantages such as being light, thin, energy-saving, and radiationless. With the recent development of display technology, the demand of users for liquid crystal modules has increased. The current common requirement is to realize automatic dimming under wide and narrow viewing angle display, that is, external ambient light data is sent to the liquid crystal module to be processed, so that the effect that the brightness of the liquid crystal module and the ambient light form a corresponding relation is realized.
The automatic backlight brightness adjustment automatically adjusts the backlight brightness of the screen according to the brightness of the ambient light, so that the backlight brightness of the screen and the ambient light are in positive correlation, namely, the backlight brightness of the screen is reduced when the ambient light is dark, and the backlight brightness of the screen is increased when the ambient light is strong, so that the comfort degree of watching by human eyes is improved, and meanwhile, the effect of protecting the vision is achieved.
However, because the screen of the current intelligent mobile terminal is lighted more and more quickly, the user opens the automatic backlight brightness adjusting function, and the situation that the current ambient light condition cannot be informed to the intelligent mobile terminal by the ambient light sensor when the intelligent mobile terminal is started is often caused, so that the backlight brightness is not matched with the ambient light, and the watching comfort level of human eyes is influenced.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a backlight adjusting device, a backlight adjusting method and a display device, in which a pulse width modulation signal is adjusted according to ambient light brightness, and signal adjustment is completed before backlight is turned on, so that module brightness is matched with current ambient light when a computer is turned on, thereby achieving a purpose of making human visual effect comfortable.
According to a first aspect of the present invention, there is provided a backlight adjustment apparatus, comprising:
an ambient light sensor to receive ambient light and generate an ambient light signal;
the microprocessor is connected with the ambient light sensor and used for acquiring the ambient light signal; and
the time schedule controller is connected with the microprocessor and controls the first pulse width modulation signal output by the time schedule controller to be input to the microprocessor after the ambient light signal,
the microprocessor generates a second pulse width modulation signal according to the ambient light signal and the first pulse width modulation signal, wherein the second pulse width modulation signal is used for controlling backlight brightness.
Optionally, the backlight adjusting apparatus further comprises:
the time sequence controller is connected with the memory and controls the sequence of the first pulse width modulation signal and the ambient light signal reaching the microcontroller according to the execution rule;
and the backlight driving module is connected with the microprocessor and used for receiving the second pulse width modulation signal and accordingly starting the backlight source.
Optionally, the timing controller, the memory and the ambient light sensor are connected to the microprocessor through the same IIC bus.
Optionally, the microprocessor comprises an MCU and the memory comprises an EEPROM.
Optionally, the microprocessor is further configured to initialize an ambient light measurement period of the ambient light sensor, and obtain the ambient light signal with different accuracies according to different ambient light measurement periods.
According to a second aspect of the present invention, there is provided a backlight adjusting method, comprising:
reading ambient light data corresponding to ambient light;
acquiring a first pulse width modulation signal transmitted via a timing controller;
generating a second pulse width modulated signal from the ambient light signal and the first pulse width modulated signal; and
and carrying out backlight driving according to the second pulse width modulation signal to control the backlight brightness.
Optionally, before reading the ambient light data corresponding to the ambient light, the method further includes:
initializing an ambient light measurement period with a first precision;
the timing controller downloads the internal code and the execution rule from the memory.
Optionally, before reading the ambient light data corresponding to the ambient light, the method further includes:
and establishing a data table, and storing the corresponding relation among the ambient light signal, the first pulse width modulation signal and the second pulse width modulation signal.
Optionally, after performing backlight driving according to the second pulse width modulation signal and controlling backlight brightness, the method further includes:
the ambient light measurement cycle is initialized with a second accuracy, the second accuracy being higher than the first accuracy.
According to a third aspect of the present invention, there is provided a display device comprising:
a display panel; and
the backlight adjusting device is connected with the display panel and provides a light source for the display panel.
The backlight adjusting device, the backlight adjusting method and the display device provided by the invention have the advantages that when the system is started, the environment light sensor is adopted to obtain the environment light signal corresponding to the external environment light, the environment light signal is read by the microprocessor, the time schedule controller controls the first pulse width modulation signal to be input to the microcontroller after the environment light, so that the microcontroller generates the second pulse width modulation signal according to the first pulse width modulation signal and the environment light signal, the backlight adjusting device realizes backlight brightness adjustment according to the second pulse width modulation signal, therefore, when the system is started, the backlight brightness can be automatically adjusted according to the environment light, the processing of the environment light signal is completed before the backlight is lightened, the backlight brightness of a screen is matched with the environment light brightness, and the watching comfort level is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a schematic block diagram of a backlight adjusting apparatus according to an embodiment of the present invention.
Fig. 2 shows a connection diagram of the backlight adjusting device on the same bus according to the embodiment of the invention.
Fig. 3a to 3d are chip configuration diagrams respectively illustrating a memory, a timing controller, a light sensor and a microprocessor of the backlight adjusting apparatus according to the embodiment of the invention.
Fig. 4 is a waveform diagram illustrating a backlight adjusting method according to an embodiment of the invention at power-on.
Fig. 5 illustrates a schematic structural diagram of a display device according to an embodiment of the present invention.
Fig. 6 shows a flowchart of a backlight adjusting method according to an embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. "known," "fixed," "given," and "predetermined" generally refer to a value, quantity, parameter, constraint, condition, state, flow, process, method, implementation, or various combinations thereof that is theoretically variable but, if set in advance, remains constant during subsequent use.
Fig. 1 shows a schematic block diagram of a backlight adjusting apparatus according to an embodiment of the present invention. Fig. 2 shows a connection diagram of the backlight adjusting device on the same bus according to the embodiment of the invention.
As shown in fig. 1, the backlight adjusting apparatus 100 mainly includes an ambient light sensor 110, a microprocessor 120, a timing controller 130, and a memory 140. The backlight adjusting device 100 is located outside the display panel of the display device, for example, in the backlight module, and is used for providing a driving signal of the backlight module, i.e. a pulse width modulation signal. The backlight module lights the backlight according to the pulse width modulation signal provided by the backlight adjusting device 100.
In this embodiment, the ambient light sensor 110 receives ambient light from the outside and generates an ambient light signal ALS; the microprocessor 120 is connected to the ambient light sensor 110 and obtains the ambient light signal ALS, for example, the microprocessor 120 reads the data generated by the ambient light sensor 110. The timing controller 130 is connected to the microprocessor 120, and controls the first pulse width modulation signal PWMO to be input to the microprocessor 120 after the ambient light signal ALS, that is, the timing controller 130 is used to control the timing of the signal reaching the microprocessor 120, and in the backlight adjusting device 100, the timing controller 130 controls the first pulse width modulation signal PWMO generated by the system to be transmitted to the microprocessor 120 after the ambient light signal ALS is read by the microprocessor 120. Accordingly, the microprocessor 120 generates a second pulse width modulation signal PWMO-M for lighting the backlight according to the ambient light signal ALS and the first pulse width modulation signal PWMO. The backlight adjusting apparatus 100 further includes a backlight driving module (not shown) and a backlight source, for example, an LED lamp. The second pulse width modulation signal PWMO-M generated by the microprocessor 120 is output to the backlight driving module, and the backlight driving module lights the corresponding LED lamp according to the second pulse width modulation signal PWMO-M, so that the backlight module emits light to provide a backlight source for the display panel.
The memory 140 stores internal codes and execution rules, and the timing controller 130 is connected to the memory 140 and controls the order in which the first pulse width modulation signal PWMO and the ambient light signal ALS reach the microcontroller 120 according to the execution rules. So that when the display device is turned on, the time sequence of reading ALS data by the control microprocessor 120 downloads the internal code and the time sequence of executing the rule by the timing controller 130, and completes data transmission before the backlight is turned on, thereby completing the processing of the ambient light before the backlight is turned on.
Further, the microprocessor 120 is also configured to initialize the ambient light measurement period of the ambient light sensor 110, and obtain the ambient light signal ALS with different accuracies according to different ambient light measurement periods.
As shown in fig. 2, the timing controller 130, the memory 140, and the ambient light sensor 110 are connected to the microprocessor 120 through the same IIC bus. In FIG. 2, the IIC bus consists of only two lines, one of which is called a Serial Clock Line (SCL); the other is called Serial Data Line (Serial Data Line) and is denoted by SDA. They are all led from the microprocessor 120 and the other circuit units are hung on both wires.
Referring to fig. 1 and fig. 2, in this embodiment, the microprocessor 120 initializes an ambient light detection period of the ambient light sensor 110, then the timing controller 130 downloads an internal code and an execution rule from the memory to implement signal transmission sequence control, and then the microprocessor 120 reads the ambient light signal ALS generated by the ambient light sensor 110 first, and then the microprocessor 120 obtains the first pulse width modulation signal PWMO transmitted by the timing controller 130, so as to avoid transmission confusion between the pulse width modulation signal and the ambient light signal. Then, the microprocessor 120 processes the received two signals, outputs a second pulse width modulation signal PWMO-M, and lights the backlight by the second pulse width modulation signal PWMO-M. Therefore, the display device equipped with the backlight adjusting device 100 of the present embodiment detects the ambient light before the backlight is not lit when the device is turned on, and uses the microprocessor 120 to process the ambient light signal ALS, and then processes the PWMO and the ambient light signal ALS sent by the system according to the algorithm, thereby achieving the effect of matching the brightness of the liquid crystal module with the ambient light when the device is turned on.
Further, the microprocessor 120 includes an MCU, the memory 140 includes an EEPROM, and the timing controller 130 is a TCON. This is described below in connection with fig. 3 a-3 d.
Fig. 3a to 3d are chip configuration diagrams respectively illustrating a memory, a timing controller, a light sensor and a microprocessor of the backlight adjusting apparatus according to the embodiment of the invention.
Referring to fig. 3a, which shows an exemplary chip structure of the memory 140, for example, an EEPROM, the chip U1 includes pins 1 to 9, and receives various signals, and the pin 5 and the pin 6 of the chip U1 are connected to the above-mentioned IIC bus, and transmits data, for example, signals output from two pins framed in an a1 frame, a first data signal MSDA and a first clock signal MSCL, to the timing controller 130. In addition, the pins 5 and 6 are connected to the voltage signal VDD through the resistor R3 and the resistor R2, respectively. Pin 2 and pin 8 are directly connected to the voltage signal VDD, pin 3, pin 4 and pin 9 are grounded, pin 1 is connected to the voltage signal VDD through the capacitor C0, and pin 7 is connected to the resistor R1 and outputs the WP signal. In this embodiment, only the signals output from the pins 5 and 6 of the chip U1 are obtained, so other pins and functions will not be described in detail.
Further, as shown in fig. 3b, which shows an exemplary chip structure of the timing controller 130, the chip U2 also includes a plurality of pins, wherein the pin 61 and the pin 62 are connected to the IIC bus, and the internal code and the execution rule are downloaded from the memory 140 through the two pins, so that the pin 61 and the pin 62 are respectively connected to the pin 6 and the pin 5 of the chip U1, and the pins in the a2 frame correspondingly receive the signals output from the pins in the a1 frame, that is, the pin 61 and the pin 62 respectively receive the first clock signal MSCL and the first data signal MSDA. Further, the chip U2 further includes a pin 6 and a pin 53, the pin 6 is connected to the resistor R8, receives the initial pwm signal PWMI generated by the system (block C0), and then outputs the first pwm signal PWMO to the microprocessor 120 through the pin 53 (block C1). Of course, as shown in fig. 3b, the chip U2 is further connected to a capacitor, a resistor, etc. through other pins, respectively, to implement different functions or data transmission, which will not be described in detail herein.
Further, as shown in fig. 3c, an exemplary chip structure of the ambient light sensor 110 is shown, the chip U3 includes pins 1-10, and pins 7, 9 and 10 are connected to the microprocessor 120 for transmitting data to the microprocessor 120, for example, signals provided in B1, and the second data signal MSDA, the second clock signal MSCL and the voltage signal INT are respectively input to the microprocessor 120 through pins 7, 10 and 9. For the same reasons as in fig. 3a and 3b, other pins and structures of the chip U3 will not be described in detail.
Further, as shown in fig. 3d, a chip structure of the microprocessor 120 is provided, here shown as a chip of the MCU. The chip U4 includes pins 30-32, and is connected to the ambient light sensor 110, signals in the frame B2 are all from the chip U3, and correspondingly, the pin 32, the pin 31, and the pin 30 of the chip U4 are respectively connected to the pin 7, the pin 10, and the pin 9 of the chip U3, and respectively receive the second data signal MSDA, the second clock signal MSCL, and the voltage signal INT, thereby implementing reading of ambient light data. The chip U4 further includes a pin 19 and a pin 20, and the pin 19 and the pin 20 corresponding to the signal in the C2 frame are connected to the pin 6 of the chip U2 in fig. 3b, which commonly receives the first pulse width modulation signal PWMO transmitted by the timing controller 130.
Further, the chip U4 also includes a pin 18 that outputs a second pulse width modulated signal PWMO-M, a signal shown in block D1.
Referring to fig. 2 and fig. 3a to 3d, the microprocessor 120 initializes the ambient light measurement period of the ambient light sensor 110, and then the timing controller 130 downloads the internal code and the execution rule from the memory 140, the microprocessor 120 reads the ambient light signal ALS from the ambient light sensor 110, the timing controller 130 controls the first pulse width modulation signal PWMO to reach the microprocessor 120, and the microprocessor 120 generates the second pulse width modulation signal PWMO-M output after processing. Therefore, the backlight brightness is adjusted according to the brightness of the ambient light, so that the screen brightness is adaptive to the ambient light brightness when the mobile phone is started, and the watching comfort level is improved.
Fig. 4 is a waveform diagram illustrating a backlight adjusting method according to an embodiment of the invention at power-on.
As in fig. 4, the abscissa represents time T and the ordinate represents voltage U. The M-IIC is the data transmission on the IIC bus, VLED/PWM/EN represents the backlight data, and the time from the power-on (time T1) to the backlight lighting (time T2) is about 200ms, and the backlight adjustment of the embodiment is completed within the 200 ms. t1, t2, and t3 respectively represent three phases that are elapsed from power-on to backlight lighting. Specifically, at time T1, the display device is powered on, and then at time T1, the ambient light measurement cycle is initialized for the ambient light sensor 110, and initialized with a first accuracy, e.g., a low accuracy. Precision here refers to the fineness of brightness indicated by ALS signals, and under the same light source brightness, light source data can be divided into 1000 parts at low precision, and more parts can be divided at higher precision; but the higher the accuracy, the longer the initialization requirement. To meet the VESA boot timing standard, we set the first read precision at boot to low precision. Then, in a period T2, the timing controller 130 downloads the internal code of the memory 140, and so on, and it takes about 100ms, in a period T3, the ambient light signal ALS is read for the first time, and then at a time T2, the backlight is turned on, and the screen displays the picture. Therefore, the backlight adjusting process can be completed within 200ms after the power is turned on and before the backlight is lightened, so that the screen brightness is matched with the ambient light brightness when the screen is lightened, and the effects of enabling the comfort degree and the experience degree of human eyes to be better are achieved. After the subsequent startup is completed, the ambient light sensor 110 is initialized with higher precision, and normal data is read.
Fig. 5 illustrates a schematic structural diagram of a display device according to an embodiment of the present invention.
As shown in fig. 5, the display device 200 includes a backlight adjusting device 100 and a display panel 210, and the backlight adjusting device 100 includes an ambient light sensor 110, a microprocessor 120, a timing controller 130, a memory 140, a backlight driving module 150, and a processor 160. The backlight adjusting device 100 is, for example, located in a backlight module, and the backlight module is connected to a display panel to provide a backlight source for the display panel. The processor 160 is, for example, an ARM for generating an initial pulse width modulation PWMI, the processor 160 is connected to the timing controller 130, and the timing controller 130 outputs the received signal as a first pulse width modulation signal PWMO and then is processed as a second pulse width modulation signal PWMO-M by the microprocessor 120. The backlight driving module 150 is connected to the microprocessor 120, receives the second pulse width modulation signal PWMO-M, and lights the corresponding LED lamp according to the PWMO-M signal, so as to light the backlight source, provide the backlight source for the display panel 210, and allow the liquid crystal molecules inside the display panel 210 to transmit light to display brightness. The timing controller 130 is also connected to the display panel 210, and controls the display of the picture on the display panel 210, for example, controls the gate driving signal and the source driving signal input to the display panel 210. Only a part of the structure related to the present invention is described, the structure of other display devices is not described in detail, and the backlight control and the liquid crystal display are referred to the prior art and not described in detail.
When the display device 200 is turned on, the ambient light is detected before the backlight is not lit, the microprocessor 120 processes the ambient light signal ALS, and then processes the first pulse width modulation signal PWMO and the ambient light signal ALS sent by the system according to the algorithm, thereby achieving the effect of matching the brightness of the liquid crystal module with the ambient light when the display device is turned on.
Fig. 6 shows a flowchart of a backlight adjusting method according to an embodiment of the present invention.
As shown in fig. 6, the backlight adjusting method includes steps S101 to S106, and in conjunction with fig. 4:
in step S101, an ambient light measurement period is initialized with a first accuracy.
And initializing an ambient light measuring period with low precision, so that the ambient light signal is read within 200ms before the backlight is turned on after the device is started.
In step S102, the timing controller downloads the internal code and the execution rule from the memory.
After the initialization is completed, the internal code and the execution rule stored in the memory are downloaded by the time schedule controller, and the sequence is limited for data transmission.
In step S103, ambient light data corresponding to ambient light is read.
The microprocessor reads the ambient light data ALS.
In step S104, a first pulse width modulation signal transmitted via the timing controller is acquired.
The microprocessor acquires a first pulse width modulation signal PWMO.
In step S105, a second pulse width modulation signal is generated from the ambient light signal and the first pulse width modulation signal.
In step S106, backlight driving is performed according to the second pulse width modulation signal, and backlight luminance is controlled.
The microprocessor processes the first pulse width modulation signal PWMO and the ambient light data ALS to generate a second pulse width modulation signal PWMO-M, and the backlight driving module lights the backlight.
Before step S101, the method further includes: and establishing a data table, and storing the corresponding relation among the ambient light signal, the first pulse width modulation signal and the second pulse width modulation signal.
Furthermore, a data table or a lookup table is established, and different second pulse width modulation signals are set for different signal pairs corresponding to different ambient light signals and first pulse width modulation signals, so that the corresponding second pulse width modulation signals can be quickly searched and output according to the data of the current ambient light signals and the first pulse width modulation signals.
Further included after step S106 is: the ambient light measurement cycle is initialized with a second accuracy, the second accuracy being higher than the first accuracy.
Further, after the backlight is turned on and the screen normally displays the picture, the ambient light measurement period is initialized with a second precision, for example, high precision, so that the collection precision of the ambient light is improved.
According to the backlight adjusting device, the backlight adjusting method and the display device, when the system is started, the environment light sensor is adopted to obtain the environment light signal corresponding to the external environment light, the environment light signal is read by the microprocessor, the time schedule controller controls the first pulse width modulation signal to be input to the microcontroller after the environment light, so that the microcontroller generates the second pulse width modulation signal according to the first pulse width modulation signal and the environment light signal, the backlight adjusting device realizes backlight brightness adjustment according to the second pulse width modulation signal, backlight brightness can be automatically adjusted according to the environment light when the system is started, the environment light signal is processed before the backlight is lightened, the screen backlight brightness corresponds to the environment light brightness when the system is started, and the watching comfort level is improved.
It will be understood that when an element is referred to as being "coupled" or "connected" to another element, it can be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present. Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
Finally, it should be noted that: while embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A backlight adjustment apparatus, comprising:
an ambient light sensor to receive ambient light and generate an ambient light signal;
the microprocessor is connected with the ambient light sensor and used for acquiring the ambient light signal; and
the time schedule controller is connected with the microprocessor and controls the first pulse width modulation signal output by the time schedule controller to be input to the microprocessor after the ambient light signal,
the microprocessor generates a second pulse width modulation signal according to the ambient light signal and the first pulse width modulation signal, wherein the second pulse width modulation signal is used for controlling backlight brightness.
2. The backlight adjusting apparatus according to claim 1, further comprising:
the time sequence controller is connected with the memory and controls the sequence of the first pulse width modulation signal and the ambient light signal reaching the microcontroller according to the execution rule;
and the backlight driving module is connected with the microprocessor and used for receiving the second pulse width modulation signal and accordingly starting the backlight source.
3. The backlight adjustment apparatus of claim 2, wherein the timing controller, the memory, and the ambient light sensor are connected to the microprocessor through the same IIC bus.
4. The backlight adjustment device of claim 2, wherein the microprocessor comprises an MCU and the memory comprises an EEPROM.
5. The backlight adjustment device according to claim 1, wherein the microprocessor is further configured to initialize an ambient light measurement period of the ambient light sensor, and to obtain the ambient light signal with different accuracies according to different ambient light measurement periods.
6. A backlight adjustment method, comprising:
reading ambient light data corresponding to ambient light;
acquiring a first pulse width modulation signal transmitted via a timing controller;
generating a second pulse width modulated signal from the ambient light signal and the first pulse width modulated signal; and
and carrying out backlight driving according to the second pulse width modulation signal to control the backlight brightness.
7. The backlight adjustment method of claim 6, wherein prior to reading the ambient light data corresponding to the ambient light, further comprising:
initializing an ambient light measurement period with a first precision;
the timing controller downloads the internal code and the execution rule from the memory.
8. The backlight adjustment method of claim 6, wherein prior to reading the ambient light data corresponding to the ambient light, further comprising:
and establishing a data table, and storing the corresponding relation among the ambient light signal, the first pulse width modulation signal and the second pulse width modulation signal.
9. The backlight adjusting method according to claim 7, wherein after the backlight driving according to the second pulse width modulation signal, controlling the backlight brightness, further comprising:
initializing an ambient light measurement cycle with a second accuracy, the second accuracy being higher than the first accuracy.
10. A display device, comprising:
a display panel; and
the backlight adjustment device of any of claims 1-8, coupled to the display panel to provide a light source for the display panel.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113920925A (en) * | 2021-10-20 | 2022-01-11 | 京东方科技集团股份有限公司 | Display screen brightness adjusting method, display, device and readable storage medium |
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