CN115294926B - Driving circuit, driving method, display device, and medium - Google Patents
Driving circuit, driving method, display device, and medium Download PDFInfo
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- CN115294926B CN115294926B CN202211169818.7A CN202211169818A CN115294926B CN 115294926 B CN115294926 B CN 115294926B CN 202211169818 A CN202211169818 A CN 202211169818A CN 115294926 B CN115294926 B CN 115294926B
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a driving circuit, a driving method, display equipment and a medium, wherein the driving method comprises the following steps: if the display screen block has temperature fluctuation, the resistor group in the driving module is controlled to be converted into a second resistor value from a first resistor value based on the current temperature, and after the first driving current of the driving module is controlled to be converted into a second driving current according to the second resistor value, the luminous intensity of the lamp area corresponding to the display screen block is compensated based on the second driving current so as to compensate the display screen brightness difference caused by the temperature fluctuation. The characteristic that the first resistor in the driving module changes along with the temperature change enables the driving current for driving the luminous intensity of the lamp area to dynamically change, so that abnormal variation of the luminous intensity of the lamp area caused by temperature fluctuation is compensated, the luminous intensity of the lamp area can be stabilized on a factory set value or a preset value, and the problem of color distortion of a display picture caused by temperature fluctuation is avoided.
Description
Technical Field
The present invention relates to the field of liquid crystal display, and more particularly, to a driving circuit, a driving method, a display device, and a computer readable storage medium.
Background
In the existing LED display screen, for example, a Mini-LED display screen, a driving module is often used for outputting fixed driving current to drive a Mini-LED lamp area, so that the luminous intensity of the same-color lamp area can tend to be consistent, and the consistency of the brightness and the color temperature of the display screen is further ensured.
However, in practical applications, it is found that the light emitting intensity of the light area is affected by the driving current, but also the working temperature of the corresponding display screen block, the white balance is shifted due to the working temperature of different blocks on the display screen, and the viewing value is deteriorated due to the fact that the driving current is fixed, when the working temperature of some blocks of the display screen is lower and the working temperature of other blocks is higher, the light emitting intensity of the light area corresponding to the lower working temperature is larger, the light emitting intensity of the light area corresponding to the higher working temperature is smaller, so that the brightness between the display screen blocks is different, and further the color distortion exists in the picture displayed by the display screen formed by the display screen blocks.
Disclosure of Invention
The main objective of the present invention is to provide a driving circuit, a driving method, a display device and a computer readable storage medium, which aim to solve the technical problem that the color distortion exists in the picture displayed by the display screen caused by the influence of the working temperature of the corresponding display screen block on the luminous intensity of the lamp area.
In order to achieve the above object, the present invention provides a driving circuit, which includes a plurality of control units, wherein the control units include a driving module, and the driving module includes a constant current driving chip, a first resistor, a second resistor and a light emitting diode;
the first resistor and the second resistor are connected in series on the current input end of the constant current driving chip, or the first resistor and the second resistor are connected in parallel on the current input end of the constant current driving chip;
the light emitting diode is connected with the constant current output end of the constant current driving chip.
Optionally, the driving module comprises a constant current driving chip, a second resistor, a temperature compensation circuit and a light emitting diode;
the second resistor and the temperature compensation circuit are connected in series on the current input end of the constant current driving chip, and the light emitting diode is connected with the constant current output end of the constant current driving chip;
the temperature compensation circuit comprises a first resistor, an operational amplifier and a triode;
the positive power pin of the operational amplifier is connected with the collector of the triode in parallel on the second resistor.
The invention also provides a driving method, which comprises the following steps:
if the temperature fluctuation exists in the display screen block, controlling a resistor group in the driving module to be converted from a first resistance value to a second resistance value based on the current temperature of the display screen block, wherein the resistor group comprises a first resistor and a second resistor;
and after the first driving current of the driving module is controlled to be converted into the second driving current according to the second resistance value, driving the luminous intensity of the lamp area corresponding to the display screen block based on the second driving current so as to compensate the brightness and color difference of the display screen caused by the temperature fluctuation.
Optionally, the step of driving the light intensity of the light area corresponding to the display screen block based on the second driving current to compensate the color temperature difference of the display screen caused by the temperature fluctuation includes:
after the second luminous intensity of the lamp area is obtained based on the second driving current, the first luminous intensity of the lamp area is compensated according to the second luminous intensity of the lamp area, and the compensated luminous intensity is obtained;
and driving the brightness of the display screen block according to the compensated luminous intensity so as to compensate the display screen brightness difference caused by the temperature fluctuation.
Optionally, the step of controlling the resistor group in the driving module to be changed from the first resistor value to the second resistor value based on the current temperature if the display screen block has temperature fluctuation includes:
if the temperature of the display screen block is detected to be increased, the resistance value of the first resistor in the driving module is controlled to be reduced based on the current temperature;
combining the reduced resistance value of the first resistor with the fixed resistance value of the second resistor so as to enable the resistance value of the resistor group to be converted from the first resistance value to the second resistance value, wherein the first resistance value is the sum of the resistance value before the first resistor is reduced and the fixed resistance value of the second resistor.
Optionally, after the step of combining the reduced resistance value of the first resistor with the fixed resistance value of the second resistor, so that the resistance value of the resistor group is changed from the first resistance value to the second resistance value, the method further includes:
controlling the driving current output of the driving module to be increased according to the second resistance value to obtain a second driving current;
and controlling the increase of the luminous intensity of the lamp area corresponding to the display screen block based on the second driving current so as to compensate the brightness decay and the color temperature deflection of the display screen block caused by the temperature increase.
Optionally, the first resistor is a negative temperature coefficient thermistor, and the step of controlling the resistor group in the driving module to be changed from the first resistor value to the second resistor value based on the current temperature if the temperature of the display screen block fluctuates includes:
if the temperature of the display screen block is detected to be reduced, the resistance value of the first resistor in the driving module is controlled to be increased based on the current temperature;
combining the raised resistance value of the first resistor with the fixed resistance value of the second resistor so as to enable the resistance value of the resistor group to be converted from the first resistance value to the second resistance value, wherein the first resistance value is the sum of the resistance value before the first resistor is raised and the fixed resistance value of the second resistor.
Optionally, after the step of combining the raised resistance value of the first resistor with the fixed resistance value of the second resistor, so that the resistance value of the resistor group is changed from the first resistance value to the second resistance value, the method further includes:
controlling the driving current output of the driving module to be reduced according to the second resistance value to obtain a second driving current;
and controlling the light-emitting intensity of the lamp area corresponding to the display screen block to be reduced based on the second driving current so as to compensate the brightness increase and the color temperature warming direction of the display screen block caused by the temperature reduction.
In addition, in order to achieve the above object, the present invention also provides a display device including the driving circuit, the memory, the processor, and the computer processing program stored on the memory and executable on the processor, the processor implementing the steps of the driving method when executing the computer processing program.
In addition, in order to achieve the above object, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which when executed by a processor, implements the steps of the above-described driving method.
According to the invention, the first resistor is connected to the control unit for controlling the luminous intensity of the single lamp area, namely the driving module, and the first resistor and the original second resistor of the driving module are connected to the constant current driving chip in series or in parallel, so that the characteristic that the resistance value of the first resistor can change along with the change of temperature is utilized to change the magnitude of the driving current which is output by the driving module and is used for controlling the luminous intensity of the single lamp area, the magnitude of the driving current can be dynamically changed in proportion to the temperature, the magnitude of the luminous intensity of the lamp area can be changed in proportion to the change of the driving current, and the abnormal change of the luminous intensity of the lamp area when the temperature fluctuates is counteracted, and the problem that the luminous intensity of the lamp area changes reversely along with the working temperature due to the fact that the driving current of the existing driving module is fixed is solved, so that the display screen which is displayed based on the luminous intensity of the lamp area has the situation of picture color distortion caused by the difference of the fluctuation of the temperature fluctuation.
Drawings
FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a driving circuit according to a first embodiment of the present invention, in which a first resistor and a second resistor are connected in series to a constant current driving chip;
FIG. 3 is a schematic diagram of a driving circuit according to a second embodiment of the present invention, in which a first resistor and a second resistor are connected in parallel to a constant current driving chip;
FIG. 4 is a schematic diagram of a third embodiment of a driving circuit according to the present invention, in which a temperature compensation circuit and a second resistor are connected in series to a constant current driving chip;
FIG. 5 is a flow chart of a driving method according to a first embodiment of the present invention;
FIG. 6 is a graph showing the change of the luminous intensity of the lamp area and the operating temperature of the display screen;
FIG. 7 is a graph showing the change of the luminous intensity and the temperature of the lamp area before compensation, after compensation and after compensation;
fig. 8 is a schematic diagram showing the change of the light emission intensity and the driving current of the lamp area.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| U1 | Constant current driving chip | D1 | Light emitting diode |
| Rext | Second resistor | C | Capacitance device |
| Rntc | |
10 | Temperature compensation circuit |
| U2 | Operational amplifier | Vref | Reference voltage |
| Q1 | Triode transistor | Vin | Current input terminal |
| R1 | Third resistor | D2 | Diode |
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The main solutions of the embodiments of the present invention are: the first resistor is added on the existing driving module, so that the first resistor and the second resistor are connected in series or in parallel to the current input end of the constant current driving chip, and the driving current output by the driving module dynamically changes in proportion to the temperature based on the characteristic that the resistance value of the first resistor can change along with the change of the temperature, so that the luminous intensity of the lamp area can change in proportion to the change of the driving current.
In the display of the existing Mini-LED display screen, the luminous intensity of a lamp area for controlling the display brightness is influenced by the operating temperature of the display screen besides the influence of driving current, and because the Mini-LED display screen is controlled by a plurality of lamp areas and display screen blocks corresponding to different lamp areas are controlled by a plurality of driving modules with the same driving current, when the display screen has the condition of uneven temperature, the brightness and the color of the display screen at the moment are different, and the problem of inconsistent blocky colors of the displayed picture is caused.
The invention provides a solution, which is characterized in that a first resistor is connected to an existing driving module for controlling the luminous intensity of a lamp area, so that the driving current output by the driving module can be changed in proportion to the change of the working temperature of a corresponding display screen block, the luminous intensity of the lamp area can be changed in proportion to the change of the driving current, and the brightness between the display screen blocks at different working temperatures can be kept consistent, thereby solving the problem that the luminous intensity of the lamp area is changed reversely along with the working temperature due to the fact that the driving current of the existing driving module is fixed, and the display screen brightness displayed based on the luminous intensity of the lamp area is distorted due to the difference of temperature fluctuation.
As shown in fig. 1, fig. 1 is a schematic diagram of a terminal structure of a hardware running environment according to an embodiment of the present invention.
The driving method of the embodiment of the present invention uses a display device as an application carrier, as shown in fig. 1, where the display device may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display area (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
Optionally, the display device may also include a camera, an RF (Radio Frequency) circuit, a sensor, an audio circuit, a WiFi module, and the like. Among other sensors, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display screen according to the brightness of ambient light, and a proximity sensor that may turn off the display screen and/or the backlight when the mobile terminal moves to the ear. As one of the motion sensors, the gravity acceleration sensor can detect the acceleration in all directions (generally three axes), and can detect the gravity and the direction when the mobile terminal is stationary, and the mobile terminal can be used for recognizing the gesture of the mobile terminal (such as horizontal and vertical screen switching, related games, magnetometer gesture calibration), vibration recognition related functions (such as pedometer and knocking), and the like; of course, the mobile terminal may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, and the like, which are not described herein.
It will be appreciated by those skilled in the art that the display device structure shown in fig. 1 is not limiting of the display device and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a computer processing program may be included in the memory 1005, which is a type of computer storage medium.
In the terminal shown in fig. 1, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call a computer processing program stored in the memory 1005 and perform the following operations:
if the temperature fluctuation exists in the display screen block, controlling a resistor group in the driving module to be converted from a first resistance value to a second resistance value based on the current temperature of the display screen block, wherein the resistor group comprises a first resistor and a second resistor;
and after the first driving current of the driving module is controlled to be converted into the second driving current according to the second resistance value, driving the luminous intensity of the lamp area corresponding to the display screen block based on the second driving current so as to compensate the brightness and color difference of the display screen caused by the temperature fluctuation.
Further, the processor 1001 may call a computer processing program stored in the memory 1005, and further perform the following operations:
And driving the luminous intensity of the lamp area corresponding to the display screen block based on the second driving current so as to compensate the color temperature difference of the display screen caused by temperature fluctuation, wherein the method comprises the following steps: after the second luminous intensity of the lamp area is obtained based on the second driving current, the first luminous intensity of the lamp area is compensated according to the second luminous intensity of the lamp area, and the compensated luminous intensity is obtained;
and driving the brightness of the display screen block according to the compensated luminous intensity so as to compensate the display screen brightness difference caused by the temperature fluctuation.
Further, the processor 1001 may call a computer processing program stored in the memory 1005, and further perform the following operations:
the step of controlling the resistor group in the driving module to be converted from the first resistor value to the second resistor value based on the current temperature comprises the following steps: if the temperature of the display screen block is detected to be increased, the resistance value of the first resistor in the driving module is controlled to be reduced based on the current temperature;
combining the reduced resistance value of the first resistor with the fixed resistance value of the second resistor so as to enable the resistance value of the resistor group to be converted from the first resistance value to the second resistance value, wherein the first resistance value is the sum of the resistance value before the first resistor is reduced and the fixed resistance value of the second resistor.
Further, the processor 1001 may call a computer processing program stored in the memory 1005, and further perform the following operations:
combining the reduced resistance value of the first resistor with the fixed resistance value of the second resistor, so that after the step of converting the resistance value of the resistor group from the first resistance value to the second resistance value, controlling the driving current output of the driving module to be increased according to the second resistance value to obtain a second driving current;
and controlling the increase of the luminous intensity of the lamp area corresponding to the display screen block based on the second driving current so as to compensate the brightness decay and the color temperature deflection of the display screen block caused by the temperature increase.
Further, the processor 1001 may call a computer processing program stored in the memory 1005, and further perform the following operations:
if the display screen block has temperature fluctuation, controlling the resistor group in the driving module to be converted from a first resistance value to a second resistance value based on the current temperature, wherein the method comprises the following steps of: if the temperature of the display screen block is detected to be reduced, the resistance value of the first resistor in the driving module is controlled to be increased based on the current temperature;
combining the raised resistance value of the first resistor with the fixed resistance value of the second resistor so as to enable the resistance value of the resistor group to be converted from the first resistance value to the second resistance value, wherein the first resistance value is the sum of the resistance value before the first resistor is raised and the fixed resistance value of the second resistor.
Further, the processor 1001 may call a computer processing program stored in the memory 1005, and further perform the following operations:
combining the raised resistance value of the first resistor with the fixed resistance value of the second resistor, so that after the step of converting the resistance value of the resistor group from the first resistance value to the second resistance value, controlling the driving current output of the driving module to be reduced according to the second resistance value to obtain a second driving current;
and controlling the light-emitting intensity of the lamp area corresponding to the display screen block to be reduced based on the second driving current so as to compensate the brightness increase and the color temperature warming direction of the display screen block caused by the temperature reduction.
Referring to fig. 2 and 3, the present invention provides a driving circuit including a plurality of control units including a driving module including a constant current driving chip (i.e., U1 in fig. 2 and 3), a first resistor (i.e., rntc in fig. 2, 3 and 4), a second resistor (i.e., rext in fig. 2, 3 and 4), and a light emitting diode (i.e., D1 in fig. 2 and 3);
in this embodiment, a single driving module includes a constant current driving chip, a first resistor, a second resistor, and a plurality of light emitting diodes.
The first resistor and the second resistor are connected in series on the current input end of the constant current driving chip, or the first resistor and the second resistor are connected in parallel on the current input end of the constant current driving chip;
the light emitting diode is connected with the constant current output end of the constant current driving chip.
Optionally, in this embodiment, the driving circuit drives and controls the display panel to display a corresponding picture, and the driving circuit includes a plurality of control units disposed on the control circuit of the display area, and in this embodiment, one control unit includes three driving modules for driving the three-color light emitting diodes respectively, where the first resistor is a thermistor, and the second resistor is a common resistor.
Further, referring to fig. 4, the driving module includes a constant current driving chip, a second resistor, a temperature compensation circuit and a light emitting diode;
the second resistor and the temperature compensation circuit are connected in series on the current input end of the constant current driving chip, and the light emitting diode is connected with the constant current output end of the constant current driving chip;
the temperature compensation circuit comprises a first resistor, an operational amplifier (namely U2 in fig. 4) and a triode (namely Q1 in fig. 4);
The non-inverting input end of the operational amplifier is connected with the first resistor, the inverting input end of the operational amplifier is connected with a reference voltage (namely Vref in figure 4), the output end of the operational amplifier is connected with the base electrode of the triode, and the positive power pin of the operational amplifier and the collector electrode of the triode are connected in parallel on the second resistor.
Alternatively, in the present embodiment, the calculation formula of the driving current of each constant current output channel of the constant current driving chip is formula (1):
Wherein, the liquid crystal display device comprises a liquid crystal display device,
in order to drive current, the coefficient A is a constant of the constant current driving chip, G is a current gain of a register in the constant current driving chip, rext is a resistance value of the driving module, and because the current gain G of the register is set by software, and the current gain G of the constant current driving chip corresponding to the same-color lamp area is required to be consistent, and the resistance value of the second resistor is fixed, the resistance value of the driving module can be dynamically changed by connecting a first resistor, namely the first resistor, on the basis of the second resistor under the condition that the Rext and the current gain are both fixed values.
Optionally, as shown in fig. 2, in the first embodiment of the driving circuit of the present invention, the first resistor and the second resistor are connected in series to the current input end of the constant current driving chip to form the driving module, where the total resistance value Rext' =rext+rntc of the driving module at this time, rext is the resistance value of the second resistor, rntc is the resistance value of the first resistor, where the influence of the first resistor on the driving current output by the driving module is greater, and in practical application, the first resistor with the resistance value less affected by temperature is selected as the best choice.
Optionally, as shown in fig. 3, in a second embodiment of the driving circuit of the present invention, the first resistor and the second resistor are connected in parallel to the current input end of the constant current driving chip to form a driving module, where the total resistance value Rext' =rext_rntc/rext+rntc of the driving module is the resistance value of the second resistor, and Rntc is the resistance value of the first resistor, where the influence of the first resistor on the driving current output by the driving module is smaller, and in practical application, the first resistor with the smaller resistance value affected by temperature is selected as the best choice.
In addition, OUT1-OUT16 in fig. 2 and 3 are constant current driving channels for outputting driving currents to the light emitting diode, GND is a ground pin, LE (LoadEnable) is a load enable function pin, DCLK is a clock input pin, SDI is a data input pin, SDO is a serial data output pin, VDD is a digital power supply pin, OE is an output enable terminal, and GCLK is a global clock pin.
Optionally, as shown in fig. 4, in the third embodiment of the driving circuit of the present invention, the temperature compensation circuit built by using the operational amplifier, the triode and the first resistor is connected in series with the second resistor at the current input end of the constant current driving chip, that is, vin, which essentially amplifies the temperature information of the first resistor by the operational amplifier, and sends the amplified temperature information to the base of the triode, so as to control the size of the collector load resistor of the triode, thereby realizing the dynamic change of the total resistance value of the driving module, wherein the third resistor (i.e. R1 in fig. 4) in the temperature compensation circuit plays a role of current limiting, and the parallel connection of the diode (i.e. D2 in fig. 4) and the capacitor (i.e. C in fig. 4) can filter the interference signal, prevent the influence of the interference signal on the temperature compensation circuit, and the reference voltage can provide a constant voltage for the operational amplifier.
In addition, the invention also provides a driving method. The driving method of the present invention is applied to the driving circuit in any of the above embodiments.
Referring to fig. 5, in a first embodiment of the driving method of the present invention, the driving method of the present invention includes the steps of;
step S10, if the temperature fluctuation exists in the display screen block, controlling a resistor group in the driving module to be converted from a first resistance value to a second resistance value based on the current temperature of the display screen block, wherein the resistor group comprises a first resistor and a second resistor;
The first resistor described below is exemplified by a negative temperature coefficient thermistor.
According to the graph of the change of the luminous intensity of the RGB light area and the operating temperature of the display screen shown in fig. 6, under the condition of fixed driving current, the luminous intensity of the RGB (Red, green, blue, red, green and blue) light area changes inversely with the operating temperature of the display screen, wherein the luminous intensity of the red light area (i.e. the red curve in fig. 6) is most sensitive, and when the temperature is lower, for example at-30 degrees, the luminous intensity of the red light area occupies a relatively large area, which can reach about 1.5cd, and the color temperature of the display screen at this time is warm; when the temperature is high, for example, at 70 degrees, the light intensity of the red light area is severely attenuated, and can be attenuated to about 0.5cd, the color temperature of the display screen is too cold, which causes color distortion of the played content and seriously affects the viewing experience of the user, and the sensitivity of the light intensities of the green light area (i.e., the green curve in fig. 6) and the blue light area (i.e., the blue curve in fig. 6) is low.
Because the Mini-LED display screen is taken as an example in the embodiment, according to the existing Mini-LED display screen, the brightness of the Mini-LED display screen is displayed based on the luminous intensity of the Mini-LED lamp panel, and a plurality of Mini-LED lamp areas are arranged on the Mini-LED lamp panel, wherein one Mini-LED lamp area corresponds to one display screen block on the Mini-LED display screen.
In terms of display screens, due to the distribution differences of the switching power supplies, the components and the like, the working temperatures of different display screen blocks on the same display screen are different, and the differences of the working temperatures of different display screen blocks of the same display screen can cause the differences of color temperatures displayed by the display screen blocks, so that the display screen formed by combining the display screen blocks has color distortion due to the fact that the color temperatures are inconsistent.
Based on this, in order to make the luminous intensity of RGB lamp district and the operating temperature of display screen be the forward variation, then need control the variation to drive current's size, but because the fixed unchangeable drive current who leads to of resistance of the second resistance that current drive module inserts, so through insert a first resistance that can change along with the change of temperature on the basis of second resistance for drive module output drive current can be the reverse variation along with the change of temperature, and then make the luminous intensity of RGB lamp district size and the operating temperature of display screen be the forward variation.
Therefore, when the first resistor in a certain driving module detects that the corresponding display screen block has temperature fluctuation (namely, the temperature rises or falls relative to the temperature at the previous moment), the first resistor carries out the fluctuation of the resistance value based on the current temperature after the temperature fluctuation, so that the total resistance value of the driving module can be updated based on the resistance value of the first resistor after the fluctuation, and the total resistance value which accords with the current temperature is output, namely, the second resistance value, wherein the first resistance value is the total resistance value obtained based on the first resistor before the fluctuation, a certain display screen block is taken as an example, the temperature of the display screen block at the first moment is assumed to be 22 ℃, and the temperature of the display screen block rises from 22 ℃ to 28 ℃ when the temperature of the display screen block reaches the second moment, and in order to avoid the situation, the first resistor in the driving module corresponding to the display screen block can reduce the resistance value at the moment, and the total resistance value of the driving module is converted from a high resistance value (namely, the first resistance value) to a low resistance value, namely, the second resistance value is increased to the second resistance value, and the color temperature of the display screen block is correspondingly increased to 28 ℃, so that the color temperature of the display screen block is correspondingly increased, and the color temperature is correspondingly reduced.
It should be noted that the first resistance refers to the total resistance of the driving module before the temperature fluctuation, and the second resistance refers to the total resistance of the driving module after the temperature fluctuation makes the first resistance change.
And step S20, after the first driving current of the driving module is controlled to be converted into the second driving current according to the second resistance value, driving the luminous intensity of the lamp area corresponding to the display screen block based on the second driving current so as to compensate the brightness and color difference of the display screen caused by the temperature fluctuation.
Because the drive current output by the drive module is influenced by the blocking value, when the resistance value is changed, the corresponding drive current is also changed, and the resistance value and the drive current are in a inversely related change relation, namely, when the resistance value is increased, the drive current is correspondingly reduced, and vice versa.
The light intensity of the light area is affected by the driving current, so when the driving current varies, the light intensity of the light area also varies correspondingly, and when the driving current increases, the light intensity of the light area correspondingly increases, because the light intensity of the light area decreases due to the temperature fluctuation of the display screen block corresponding to the light area, for example, the temperature increase, the light intensity of the light area decreases, so in order to avoid the light intensity decrease of the light area caused by the temperature increase, the driving current at this time needs to increase the light intensity of the light area (that is, offset the light intensity decrease of the light area caused by the temperature increase), so that the light intensity of the light area can be stably maintained at a factory set value or a preset value of a user.
When the resistance value in the driving module is converted, namely, the first resistance value is converted into the second resistance value, the corresponding driving module can also be converted based on the driving current output by the resistance value, namely, the first driving current is converted into the second driving current, so that the luminous intensity of the lamp area can compensate the first driving current which cannot meet the temperature fluctuation based on the converted second driving current, the compensated driving current can meet the requirement of the luminous intensity of the lamp area after the temperature fluctuation, the driving current which is output by the driving module and used for driving the luminous intensity of a single lamp area is changed, the driving current can be dynamically changed in proportion to the temperature, and the luminous intensity of the lamp area can be dynamically changed in proportion to the change of the driving current, so that the brightness and the color temperature of a display screen formed by the display blocks can be kept unchanged.
It should be noted that, the first driving current is a driving current value that is output based on the total resistance of the driving module before the temperature fluctuation, and the second driving current is a driving current value that is output based on the total resistance of the driving module after the temperature fluctuation makes the resistance of the first resistor change.
Optionally, in step S20, driving the light emitting intensity of the light area corresponding to the display screen block based on the second driving current to compensate the color temperature difference of the display screen caused by the temperature fluctuation, including:
step S21, after obtaining the second luminous intensity of the lamp area based on the second driving current, compensating the first luminous intensity of the lamp area according to the second luminous intensity of the lamp area to obtain the compensated luminous intensity;
and S22, driving the brightness and the chrominance of the display screen block according to the compensated luminous intensity so as to compensate the brightness and chrominance difference of the display screen caused by the temperature fluctuation.
In this embodiment, the driving current output by each constant current driving channel of the driving module after the first resistor is connected is shown in formula (2):
Wherein, the coefficient A is the constant of the constant current driving chip, G is the current gain of the internal register of the constant current driving chip, and Rext' is the total resistance of the first resistor and the second resistor in the driving module, so
For the sake of convenience of explanation, the driving current value of the tree pool is set as the second driving current outputted by the driving module after the temperature fluctuation in the following example.
When there is a fluctuation in temperature T/°c, for example, there is a temperature rise, the emission intensity not yet compensated at this time is shown as Line3 in fig. 7, the emission intensity L/cd corresponding to T1 before the temperature rise is L1, the emission intensity corresponding to T2 after the temperature rise is L2, because Line3 approximates a straight Line, it is known from the two points a, b that the expression of the attenuation of the emission intensity not yet compensated with the temperature rise is shown as formula (3):
L3 (T) represents uncompensated light emission intensity L3 at temperature T.
Since the first resistor varies with temperature variation, the resistance of the first resistor decreases after the temperature rise is detected,the driving module is based on the total resistance value after the first resistance is reduced, and the second driving current
As can be seen from fig. 8, the driving current outputted by the driving module and the light emitting intensity of the corresponding lamp area are approximately in a proportional variation relationship, and when the first resistance is reduced, the second driving current outputted by the corresponding driving module
The light intensity of the corresponding lamp area increases, and thus, based on FIG. 8, the second driving current can be seen
The relation with the luminous intensity L of the lamp area is shown in formula (4):
L (I) represents a driving current according to a second
The magnitude of the light emission intensity L of the outputted lamp region, B is the slope of the straight line in fig. 6 (the red/green/blue curve in fig. 6 is regarded as a straight line because it approaches the straight line), because
For a known amount, B is a fixed value, so that the luminous intensity L of the lamp area at this time can be calculated, since the luminous intensity L is based on the second driving current
The output is such that the light emission intensity L at this time is the second light emission intensity, i.e., the compensation value for the first light emission intensity.
After the second light emission intensity L is obtained, the uncompensated light emission intensity L3, i.e., the first light emission intensity is compensated, and the second light emission intensity at different temperatures is changed as shown by Line2 in fig. 7, because the purpose is that the light emission intensity of the lamp region does not change with the change of temperature, it can be understood that the light emission intensity of the lamp region is always stabilized at the original light emission intensity, i.e., L1, when the temperature fluctuates between T1-T2, and thus it can be assumed that the compensated light emission intensity is changed to Line1 in fig. 7, i.e., formula (5):
Wherein L1 (T) represents the light emission intensity L1 after compensation at the temperature T.
Since Line1 is obtained by compensating Line3 with Line2, the relationship of Line2 is as shown in formula (6):
The light intensity of the compensated light area, i.e., L1 (T), can be obtained by substituting the known amounts L2 (T) and L3 (T) for the second light intensity, which is the compensated light intensity value of the first light intensity when the temperature is T, and the brightness of the corresponding display screen area is displayed based on the light intensity at this time, so that the problem of color distortion of the picture due to the brightness difference caused by the change of the light intensity of the light area along with the change of the temperature can be avoided.
In this embodiment, when detecting that the temperature fluctuation exists in the corresponding display screen block, the first resistor performs corresponding resistance value conversion according to the temperature corresponding to the temperature fluctuation, that is, the current temperature, when detecting that the temperature fluctuation exists in the corresponding display screen block, so that the driving module where the first resistor is located performs driving current conversion based on the converted total resistance value, the driving current output by the driving module can be changed in proportion to the change of the working temperature of the corresponding display screen block, the luminous intensity of the lamp area can be changed in proportion to the change of the driving current, abnormal change of the luminous intensity of the lamp area caused by the temperature fluctuation is counteracted, and further, the conditions of color distortion of the picture displayed by the display screen formed by combining the display screen blocks caused by brightness increase and color temperature bias caused by temperature bias of the display screen block when the temperature rise are avoided.
Further, based on the above-described first embodiment of the driving method of the present invention, a second embodiment of the driving method of the present invention is proposed.
In a second embodiment of the driving method of the present invention, step S10, if there is a temperature fluctuation in the display screen block, may include:
step S11, if the temperature of the display screen block is detected to be increased, controlling the resistance value of the first resistor in the driving module to be reduced based on the current temperature;
step S12, combining the reduced resistance value of the first resistor with the fixed resistance value of the second resistor, so that the resistance value of the resistor group is changed from the first resistance value to the second resistance value, wherein the first resistance value is the sum of the resistance value before the reduction of the first resistor and the fixed resistance value of the second resistor.
Step S13, if the temperature of the display screen block is detected to be reduced, the resistance value of the first resistor in the driving module is controlled to be increased based on the current temperature;
step S14, combining the raised resistance value of the first resistor with the fixed resistance value of the second resistor so as to enable the resistance value of the resistor group to be converted from the first resistance value to the second resistance value, wherein the first resistance value is the sum of the resistance value before the first resistor is raised and the fixed resistance value of the second resistor.
Optionally, after the step of combining the reduced resistance value of the first resistor with the fixed resistance value of the second resistor in step S12, so that the resistance value of the resistor group is changed from the first resistance value to the second resistance value, the method further includes:
step S15, controlling the driving current output of the driving module to be increased according to the second resistance value to obtain a second driving current;
and S16, controlling the luminous intensity of the lamp area corresponding to the display screen block to be increased based on the second driving current so as to compensate the brightness attenuation and the color temperature deflection of the display screen block caused by the temperature increase.
Optionally, after the step of combining the raised resistance value of the first resistor with the fixed resistance value of the second resistor in step S14, so that the resistance value of the resistor group is changed from the first resistance value to the second resistance value, the method further includes:
step S17, controlling the driving current output of the driving module to be reduced according to the second resistance value to obtain a second driving current;
and S18, controlling the light-emitting intensity of the lamp area corresponding to the display screen block to be reduced based on the second driving current so as to compensate the brightness increase and the color temperature warming direction of the display screen block caused by the temperature reduction.
Because the first resistor selected in this embodiment is a negative temperature coefficient thermistor, the resistance change of the negative temperature coefficient thermistor is inversely related to temperature, and the resistance value of the negative temperature coefficient thermistor can be approximated to the formula (7):
Wherein, rntc (T) is the first resistance value when the temperature fluctuation is T, rntc (T0) is the first resistance value when the temperature fluctuation is pre-T0, exp is the natural constant e, and Bn is the material constant of the first resistor.
The display screen is divided into a display screen block a and a display screen block b by way of example, when the first resistor a detects that the temperature of the corresponding display screen block a is increased, the resistance of the first resistor a can be correspondingly reduced, so that the total resistance of the driving module a is reduced, namely, after the first resistance is reduced to a second resistance, the current of the driving current output by the driving module a is increased based on the second resistance, the luminous intensity of the lamp area a is dynamically adjusted based on the increased driving current, so that the luminous intensity is correspondingly increased, and further, the brightness attenuation and the color temperature deflection of the display screen block a caused by the temperature increase are compensated, so that the normal picture color can be displayed.
When the temperature of the corresponding display screen block b is detected to be reduced by the first resistor b, the resistance of the first resistor b is correspondingly increased, so that the total resistance of the driving module b is increased, namely, after the first resistance is increased to a second resistance, the current of the driving current output by the driving module b is reduced based on the second resistance, the luminous intensity of the lamp area b is dynamically adjusted based on the reduced driving current, so that the luminous intensity is correspondingly reduced, the brightness increase and the color temperature warming direction of the display screen block b caused by the temperature reduction are further compensated, normal picture colors can be displayed, and further, the picture brightness and the color temperature displayed by a display screen formed by the display screen block a and the display screen block b can be unified on a unified value, and the picture color distortion problem caused by the difference of the brightness and the color temperature between the display screen blocks is avoided.
It should be noted that, the first resistor may also be a positive temperature coefficient thermistor, and when the first resistor is a positive temperature coefficient thermistor, the driving module at this time needs to select a constant current driving type in which the output driving current increases with the increase of the resistor, so that the output driving current is in direct proportion to the total resistance of the constant current driving level, thereby achieving the purpose that the light emitting intensity of the lamp area is positively correlated with the temperature.
In this embodiment, based on the characteristic that the first resistor in the driving module changes along with the change of temperature, the effect that the driving current output by the driving module can dynamically change is achieved, and further the effect that the luminous intensity of the lamp area changes along with the change of temperature in a positive correlation manner is achieved, the brightness difference caused by temperature fluctuation is compensated, and the consistency of brightness under different temperatures is achieved.
In addition, the embodiment of the invention also provides a display device, which comprises a driving circuit, a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of the driving method when executing the computer program.
The present invention also proposes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above-described driving method.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method of the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (9)
1. The driving circuit is characterized by comprising a plurality of control units, wherein each control unit comprises a driving module, one driving module corresponds to one display screen block, and each driving module comprises a constant current driving chip, a first resistor, a second resistor and a light emitting diode;
the first resistor and the second resistor are connected in series on the current input end of the constant current driving chip, or the first resistor and the second resistor are connected in parallel on the current input end of the constant current driving chip;
the light emitting diode is connected with the constant current output end of the constant current driving chip; or alternatively, the process may be performed,
the driving module comprises a constant current driving chip, a second resistor, a temperature compensation circuit and a light emitting diode;
the second resistor and the temperature compensation circuit are connected in series on the current input end of the constant current driving chip, and the light emitting diode is connected with the constant current output end of the constant current driving chip;
The temperature compensation circuit comprises a first resistor, an operational amplifier and a triode;
the positive power pin of the operational amplifier is connected with the collector of the triode in parallel on the second resistor;
the first resistor is used for changing the first resistance into the second resistance based on the current temperature of the display screen block after the temperature fluctuation after detecting that the temperature fluctuation exists in the display screen block corresponding to the first resistor;
and the constant current driving chip is used for driving the luminous intensity of the light emitting diode based on the second driving current after converting the first driving current into the second driving current according to the second resistance value.
2. A driving method, wherein the driving method is applied to the driving circuit as claimed in claim 1, a plurality of driving modules are arranged in the driving circuit, one driving module corresponds to each display screen block, and the driving method comprises the following steps:
If the temperature fluctuation exists in the display screen block, controlling a resistor group in the driving module to be converted from a first resistance value to a second resistance value based on the current temperature of the display screen block, wherein the resistor group comprises a first resistor and a second resistor;
and after the first driving current of the driving module is controlled to be converted into the second driving current according to the second resistance value, driving the luminous intensity of the lamp area corresponding to the display screen block based on the second driving current so as to compensate the brightness and color difference of the display screen caused by the temperature fluctuation.
3. The driving method according to claim 2, wherein the light emission intensity of the light area is proportional to the driving current of the corresponding driving module, and the step of driving the light emission intensity of the light area corresponding to the display screen block based on the second driving current to compensate for the color temperature difference of the display screen caused by the temperature fluctuation comprises:
after the second luminous intensity of the lamp area is obtained based on the second driving current, the first luminous intensity of the lamp area is compensated according to the second luminous intensity of the lamp area, and the compensated luminous intensity is obtained;
And driving the brightness of the display screen block according to the compensated luminous intensity so as to compensate the display screen brightness difference caused by the temperature fluctuation.
4. The driving method as claimed in claim 2, wherein the first resistor is a negative temperature coefficient thermistor, and the step of controlling the resistor group in the driving module to be changed from the first resistor to the second resistor based on the current temperature if the temperature of the display screen block fluctuates, comprises:
if the temperature of the display screen block is detected to be increased, the resistance value of the first resistor in the driving module is controlled to be reduced based on the current temperature;
combining the reduced resistance value of the first resistor with the fixed resistance value of the second resistor so as to enable the resistance value of the resistor group to be converted from the first resistance value to the second resistance value, wherein the first resistance value is the sum of the resistance value before the first resistor is reduced and the fixed resistance value of the second resistor.
5. The driving method according to claim 4, wherein after the step of combining the reduced resistance value of the first resistor with the fixed resistance value of the second resistor so that the resistance value of the resistor group is changed from the first resistance value to the second resistance value, the method further comprises:
Controlling the driving current output of the driving module to be increased according to the second resistance value to obtain a second driving current;
and controlling the increase of the luminous intensity of the lamp area corresponding to the display screen block based on the second driving current so as to compensate the brightness decay and the color temperature deflection of the display screen block caused by the temperature increase.
6. The driving method according to claim 2, wherein the first resistor is a negative temperature coefficient thermistor, and the step of controlling the resistor group in the driving module to be changed from the first resistor value to the second resistor value based on the current temperature if the temperature of the display screen block fluctuates, comprises:
if the temperature of the display screen block is detected to be reduced, the resistance value of the first resistor in the driving module is controlled to be increased based on the current temperature;
combining the raised resistance value of the first resistor with the fixed resistance value of the second resistor so as to enable the resistance value of the resistor group to be converted from the first resistance value to the second resistance value, wherein the first resistance value is the sum of the resistance value before the first resistor is raised and the fixed resistance value of the second resistor.
7. The driving method according to claim 6, wherein after the step of combining the raised resistance value of the first resistor with the fixed resistance value of the second resistor so that the resistance value of the resistor group is changed from the first resistance value to the second resistance value, the method further comprises:
Controlling the driving current output of the driving module to be reduced according to the second resistance value to obtain a second driving current;
and controlling the light-emitting intensity of the lamp area corresponding to the display screen block to be reduced based on the second driving current so as to compensate the brightness increase and the color temperature warming direction of the display screen block caused by the temperature reduction.
8. A display device, the display device comprising: the drive circuit of claim 1, a memory, a processor and a computer processing program stored on the memory and executable on the processor, the processor implementing the steps of the drive method of any of claims 2 to 7 when the computer processing program is executed.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the driving method according to any of claims 2 to 7.
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| CN103177692A (en) * | 2013-03-27 | 2013-06-26 | 深圳市光祥科技有限公司 | Temperature compensation control circuit for automatically adjusting color temperature of LED (Light Emitting Diode) display screen and control method |
| CN204190975U (en) * | 2014-09-12 | 2015-03-04 | 上海欣丰电子有限公司 | There is overheat protector LED constant current source drive circuit |
| CN110896574A (en) * | 2018-09-13 | 2020-03-20 | 华域视觉科技(上海)有限公司 | OLED light source drive control circuit and OLED lamp |
| CN109546529A (en) * | 2019-01-14 | 2019-03-29 | 南京信息工程大学 | A kind of semiconductor laser constant current-supplying circuit |
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