CN114038398B - Gray scale compensation circuit, display device and gray scale compensation method - Google Patents
Gray scale compensation circuit, display device and gray scale compensation method Download PDFInfo
- Publication number
- CN114038398B CN114038398B CN202110950582.XA CN202110950582A CN114038398B CN 114038398 B CN114038398 B CN 114038398B CN 202110950582 A CN202110950582 A CN 202110950582A CN 114038398 B CN114038398 B CN 114038398B
- Authority
- CN
- China
- Prior art keywords
- signal
- gray scale
- control
- control switch
- data line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The gray scale compensation circuit comprises a signal synchronization unit, a signal generation unit and a first control switch, wherein the signal synchronization unit is used for receiving a clock signal transmitted by an output end of the clock signal, carrying out frequency multiplication on the clock signal to obtain a frequency multiplication signal, transmitting the frequency multiplication signal to the signal generation unit, outputting at least one control signal in the period of the frequency multiplication signal by the signal generation unit, and switching on or switching off the first control switch by the control signal; when the first control switch is in a conducting state, the signal generating unit changes the gray scale of the LED on the column tube data line through the voltage transmission circuit, so that the column tube data line can output finer gray scale, and the display effect of the display unit is improved.
Description
Technical Field
The present invention relates to the field of semiconductor devices, and in particular, to a gray scale compensation circuit, a display device, and a gray scale compensation method.
Background
The Light-emitting diode (LED) display technology has the advantages of high brightness, high response speed, low power consumption, long service life, and the like, can be applied to ultra-large screen high-definition display, such as professional fields like monitoring and commanding, high-definition broadcasting, high-end cinema, medical detection, and the like, or commercial fields like outdoor advertising, conference exhibition, office display, and the like, and becomes a research hotspot for people to pursue a new generation of display technology.
With the development of small spacing, the LED display device puts higher requirements on row driving, from the current switching of a pure P-MOSFET (P-type Metal Oxide Semiconductor Field Effect Transistor) to the multifunctional row driving with higher integration and stronger function, now, the gray scale of the display unit in the display device is controlled by a clock signal, and the gray scale output by the column tube data line cannot be flexibly changed, so that the gray scale display of the display unit on the column tube data line is not fine and smooth enough, and the display Effect of the display unit is poor.
Therefore, how to make the gray scale display of the display unit more exquisite is an urgent problem to be solved.
Disclosure of Invention
In view of the above-mentioned shortcomings of the related art, the present application aims to provide a gray scale compensation circuit, a display device and a gray scale compensation method, which are used to solve the problems that the gray scale display of the display unit is not fine enough and the display effect of the display unit is poor.
A gray scale compensation circuit, comprising: the device comprises a signal synchronization unit, a signal generation unit and a first control switch; one end of the signal synchronization unit is connected with the output end of a clock signal, the other end of the signal synchronization unit is connected with the input end of the signal generation unit, the signal generation unit is connected with the control end of the first control switch through a signal transmission circuit, the signal generation unit is also connected with the first end of the first control switch through a voltage transmission circuit, and the second end of the first control switch is connected with the output end of the tube array data line; the signal synchronization unit is used for receiving a clock signal transmitted by an output end of the clock signal, performing frequency multiplication on the clock signal to obtain a frequency multiplication signal, and transmitting the frequency multiplication signal to the signal generation unit, wherein the signal generation unit outputs at least one control signal in a period of the frequency multiplication signal, and the control signal is used for switching on or switching off the first control switch; and the signal generating unit changes the gray scale of the LED on the column tube data line through the voltage transmission circuit when the first control switch is in a conducting state.
The gray scale compensation circuit comprises a signal synchronization unit, a signal generation unit and a first control switch, wherein the signal synchronization unit is used for receiving a clock signal transmitted by an output end of the clock signal, carrying out frequency multiplication on the clock signal to obtain a frequency multiplication signal, and transmitting the frequency multiplication signal to the signal generation unit, the signal generation unit outputs at least one control signal in a period of the frequency multiplication signal, and the control signal is used for switching on or switching off the first control switch; when the first control switch is in a conducting state, the signal generating unit changes the gray scale of the LED on the column tube data line through the voltage transmission circuit, so that the column tube data line can output finer gray scale, and the display effect of the display unit is improved.
Optionally, the signal synchronization unit includes: and the frequency divider is used for dividing the frequency of the clock signal to obtain the frequency-multiplied signal, wherein the frequency of the frequency-multiplied signal is N times of the clock signal, and N is an integer not less than 2.
Optionally, the signal generating unit includes: the first voltage limiting module is connected with the first end of the first control switch through the voltage transmission circuit and used for pulling down the driving voltage of the column tube data line when the first control switch is conducted so as to increase the gray scale of the LED on the column tube data line; the first time sequence controller is used for outputting at least one first control signal in the period of the frequency doubling signal when the gray scale needs to be increased, and transmitting the first control signal to the control end of the first control switch through the signal transmission circuit, wherein the first control signal is used for conducting the first control switch; the first time schedule controller is also used for outputting at least one second control signal in the period of the frequency doubling signal when the gray scale does not need to be increased, and transmitting the second control signal to the control end of the first control switch through the signal transmission circuit, wherein the second control signal is used for cutting off the first control switch.
Optionally, the signal generating unit further comprises: a voltage speed controller; the voltage speed controller is arranged between the first voltage limiting module and the voltage transmission circuit and used for controlling the speed of pulling down the driving voltage of the column tube data line when the first control switch is conducted.
Optionally, the signal generating unit includes: the second voltage limiting module is connected with the first end of the first control switch through the voltage transmission circuit and used for pulling up the driving voltage of the column tube data line when the first control switch is conducted so as to reduce the gray scale of the LED on the column tube data line; the second time schedule controller is used for outputting at least one first control signal in the period of the frequency doubling signal when the gray scale needs to be reduced, and transmitting the first control signal to the control end of the first control switch through the signal transmission circuit, wherein the first control signal is used for conducting the first control switch; the second time schedule controller is also used for outputting at least one second control signal in the period of the frequency doubling signal when the gray scale does not need to be reduced, and transmitting the second control signal to the control end of the first control switch through the signal transmission circuit, wherein the second control signal is used for cutting off the first control switch.
Optionally, the first control switch comprises: the control end of the field effect transistor is connected with the signal generating unit through the signal transmission circuit, the first end of the field effect transistor is connected with the signal generating unit through the voltage transmission circuit, and the second end of the field effect transistor is connected with the output end of the column tube data line; the field effect transistor is used for being switched on or switched off according to the control signal, so that the signal generation unit changes the gray scale of the LED on the column tube data line through the voltage transmission circuit when the field effect transistor is in a switching-on state.
Based on the same inventive concept, the present application further provides a display device, where the display device includes a plurality of row pipe data lines and a plurality of column pipe data lines, a display unit is disposed between each row pipe data line and each column pipe data line, and an output end of at least one column pipe data line is provided with the gray scale compensation circuit as described in any one of the above.
According to the display device, through a signal synchronization unit, a signal generation unit and a first control switch in a gray level compensation circuit, when a clock signal transmitted by an output end of the clock signal is received, the clock signal is subjected to frequency multiplication to obtain a frequency multiplication signal, the frequency multiplication signal is transmitted to the signal generation unit, the signal generation unit outputs at least one control signal in a period of the frequency multiplication signal, and the control signal is used for switching on or switching off the first control switch; when the first control switch is in a conducting state, the signal generating unit changes the gray scale of the LED on the column tube data line through the voltage transmission circuit, so that the column tube data line can output finer gray scale, and the display effect of the display unit is improved.
Optionally, the display unit comprises a red light display unit, a green light display unit and a blue light display unit; or the display unit comprises a red light display unit, a green light display unit, a blue light display unit and a yellow light display unit.
Based on the same inventive concept, the present application further provides a gray scale compensation method applied to the gray scale compensation circuit as described above, the gray scale compensation method comprising: receiving a clock signal transmitted by an output end of the clock signal through a signal synchronization unit, carrying out frequency multiplication on the clock signal to obtain a frequency multiplication signal, and transmitting the frequency multiplication signal to a signal generation unit; outputting at least one control signal to a control end of a first control switch in the period of the frequency doubling signal through the signal generating unit, wherein the control signal is used for switching on or switching off the first control switch; and the signal generating unit changes the gray scale of the LED on the column tube data line when the first control switch is in a conducting state.
According to the gray scale compensation method, when a clock signal transmitted by an output end of the clock signal is received, the clock signal is subjected to frequency multiplication to obtain a frequency multiplication signal, and the frequency multiplication signal is transmitted to the signal generation unit, the signal generation unit outputs at least one control signal in the period of the frequency multiplication signal, and the control signal is used for switching on or switching off the first control switch; when the first control switch is in a conducting state, the signal generating unit changes the gray scale of the LED on the column tube data line through the voltage transmission circuit, so that the column tube data line can output finer gray scale, and the display effect of the display unit is improved.
Optionally, when the first control switch is in an on state, the changing the gray scale of the LED on the column tube data line by the signal generating unit includes: when the first control switch is switched on, the signal generating unit pulls down the driving voltage of the column tube data line to increase the gray scale of the LED on the column tube data line.
Drawings
FIG. 1 is a waveform diagram of a gray scale output at an output terminal of a data line of a column transistor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a display unit according to an embodiment of the present invention;
FIG. 3 is a basic diagram of a gray scale and a width of 1 cycle of 1 clock signal according to an embodiment of the present invention;
FIG. 4 is a basic diagram illustrating a gray scale comparison between a gray scale N and a gray scale N +1 according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a basic structure of a gray scale compensation circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a basic structure of a signal synchronization unit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a basic structure of a signal generating unit according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a basic structure of a first voltage limiting module according to an embodiment of the present invention;
fig. 9 is a basic schematic diagram of a newly added gray t2 according to an embodiment of the present invention;
fig. 10 is a basic schematic diagram of another newly added gray scale t2 according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a basic structure of a voltage-speed controller according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a basic structure of another signal generating unit according to an embodiment of the present invention;
FIG. 13 is a basic diagram of reducing gray scale t2 according to an embodiment of the present invention;
fig. 14 is a schematic diagram of a basic structure of a first control switch according to an embodiment of the present invention;
fig. 15 is a schematic diagram of a basic structure of a display device according to an embodiment of the present invention;
fig. 16 is a schematic basic flowchart of a gray scale compensation method according to another alternative embodiment of the present invention;
description of reference numerals:
the display device comprises a 1-gray level compensation circuit, a 2-signal synchronization unit, a 3-signal generation unit, a 4-first control switch, a 5-clock signal output end, a 6-signal transmission circuit, a 7-voltage transmission circuit, an 8-column tube data line, a 21-frequency divider, a 31-first voltage limiting module, a 32-first timing controller, a 33-voltage speed controller, a 34-second voltage limiting module, a 35-second timing controller and a 9-display unit.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In the related art, with the development of small spacing, the LED display screen puts higher requirements on the line driving, from the implementation of the line switching by a simple P-MOSFET to the multifunctional line driving with higher integration and stronger function, which is introduced only by taking the common anode of the display unit 9 (taking the display unit 9 as an LED) (i.e. the anode of the display unit 9 is on the Row tube data line) as the background, as shown in fig. 1, fig. 1 is a waveform diagram of the gray scale output by the output end of the column tube data line 8, when the signal Row (n +1) output by the Row tube data line is low, the driving voltage of the Row tube data line is pulled high, and the LED on the Row tube data line is displayed; as shown in fig. 2, when the pulse widths of the output signals Out of the column pipe data lines 8 are different, the gray scales displayed by the display units 9 are different, where the pulse width of Out (m) is the narrowest, and the pulse width of Out (m +2) is the widest, so the gray scale displayed by the display unit 9 at Out (m) is lower than the gray scale displayed by the display unit 9 at Out (m + 2);
wherein, the gray scale of the LED on the column tube data line 8 is controlled by the clock signal, the column tube data line 8 performs gray scale control according to the period of the clock signal, 1 period of 1 clock signal corresponds to 1 gray scale, as shown in fig. 3, the pulse width of gray scale 1 is the period of 1 GCLK (gray scale clock signal), and so on, the pulse width of gray scale 2 is the period of 2 GCLK, the pulse width of gray scale 3 is the period of 3 GCLK, as shown in fig. 4, gray scale n +1 is increased by 1 t1 gray scale compared with gray scale n +1, gray scale t1 is the period of one GCLK in fig. 3, at present, the driving chip Driver IC cannot output the signal of gray scale width lower than one period of the clock signal, and further the column tube data line 8 cannot output the width of n + x between the gray scale n and the width of gray scale n +1, so that the display unit 9 is not fine enough to display according to the gray scale LED on the column tube data line 8, the display effect of the display unit 9 is poor.
Wherein, the value of x is greater than 0 and less than 1, for example, the value of x may be 0.5.
Of course, the value of x may also be 0.1, 0.2, 0.3, 0.4, 0.6, 0.7, 0.8, 0.9, etc. Of course, the value of x may also be a percentage (e.g., 0.55 or 65%), and is not particularly limited herein.
It is understood that the specific value of x can be determined by time t2 (see below for details).
Based on this, the present application intends to provide a solution to the above technical problem, the details of which will be explained in the following embodiments.
Examples of the invention
An embodiment of the present invention provides a gray scale compensation circuit 1, as shown in fig. 5, where the gray scale compensation circuit 1 includes: the device comprises a signal synchronization unit 2, a signal generation unit 3 and a first control switch 4;
one end of the signal synchronization unit 2 is connected with an output end 5 of a clock signal, the other end of the signal synchronization unit 2 is connected with an input end of the signal generation unit 3, the signal generation unit 3 is connected with a control end of the first control switch 4 through a signal transmission circuit 6, the signal generation unit 3 is further connected with a first end of the first control switch 4 through a voltage transmission circuit 7, and a second end of the first control switch 4 is connected with an output end of a column pipe data line 8;
the signal synchronization unit 2 is configured to receive a clock signal transmitted by an output terminal 5 of the clock signal, perform frequency multiplication on the clock signal to obtain a frequency-multiplied signal, and transmit the frequency-multiplied signal to the signal generation unit 3, where the signal generation unit 3 outputs at least one control signal in a period of the frequency-multiplied signal, and the control signal is used to turn on or turn off the first control switch 4; when the first control switch 4 is in a conducting state, the signal generating unit 3 changes the LED gray scale on the column tube data line 8 through the voltage transmission circuit 7.
The gray scale compensation circuit 1 provided in this embodiment includes a signal synchronization unit 2, a signal generation unit 3, and a first control switch 4, where the signal synchronization unit 2 is configured to receive a clock signal transmitted by an output end 5 of the clock signal, perform frequency multiplication on the clock signal to obtain a frequency multiplication signal, and transmit the frequency multiplication signal to the signal generation unit 3, and the signal generation unit 3 outputs at least one control signal in a period of the frequency multiplication signal, where the control signal is configured to turn on or off the first control switch 4; when the first control switch 4 is in a conducting state, the signal generating unit 3 changes the gray scale of the LEDs on the column tube data line 8 through the voltage transmission circuit 7, so that the LEDs on the column tube data line 8 can output finer gray scales, and the display effect of the display unit 9 is improved.
It will be appreciated that the grey scale of the LEDs on the column tube data line 8 is controlled by the drive voltage of the column tube data line 8, and when the drive voltage of the column tube data line 8 is low, the LEDs on the column tube data line 8 light up; when the driving voltage of the column tube data line 8 is high, the LED on the column tube data line 8 is in a non-lighting state, and thus, the gray scale of the LED on the column tube data line 8 can be changed by pulling down or raising the driving voltage of the column tube data line 8. And, the column pipe data line 8 is connected with the output end 5 of the clock signal, and the column pipe data line 8 and the signal synchronization unit 2 receive the same CLK signal, thereby ensuring that the column pipe data line 8 and the signal synchronization unit 2 are synchronous. It should be understood that one multiplied signal exists for a plurality of cycles and one control signal corresponds to one cycle.
In some examples of the present embodiment, as shown in fig. 6, the signal synchronization unit 2 includes, but is not limited to: the frequency divider 21 is configured to divide the frequency of the clock signal to obtain the frequency-multiplied signal, where the frequency of the frequency-multiplied signal is N times of the clock signal, and N is an integer not less than 2. The received clock signal is divided by the frequency divider 21, and the output control signal is N times of CLK, where the N times is caused by frequency doubling of the original low-frequency clock signal, so that the period of the frequency-doubled signal is shorter than that of the original clock signal, and a narrower gray scale can be obtained according to the period of the frequency-doubled signal. It is needless to say that the frequency divider 21 refers to an electronic circuit that makes the output signal frequency an integer fraction of the input signal frequency, and the frequency divider 21 includes, but is not limited to: at least one of a pulse frequency divider (also called a digital frequency divider), a sine frequency divider, and an analog-to-digital conversion-to-digital frequency divider.
In some examples of the present embodiment, as shown in fig. 7, the signal generation unit 3 includes: a first voltage limiting module 31, where the first voltage limiting module 31 is connected to the first end of the first control switch 4 through the voltage transmission circuit 7, and is configured to pull down the driving voltage of the column tube data line 8 when the first control switch 4 is turned on, so as to increase the gray scale of the LEDs on the column tube data line 8; the first timing controller 32 is configured to output at least one first control signal in a period of the frequency doubling signal when a gray scale needs to be added, and transmit the at least one first control signal to the control terminal of the first control switch 4 through the signal transmission circuit 6, where the first control signal is used to turn on the first control switch 4; the first timing controller 32 is further configured to output at least one second control signal in the period of the frequency doubling signal when the gray scale does not need to be increased, and transmit the second control signal to the control terminal of the first control switch 4 through the signal transmission circuit 6, where the second control signal is used to turn off the first control switch 4.
Taking the above example as an example, in some examples, the voltage of the first voltage limiting module 31 may be a ground voltage, as shown in fig. 8, or a voltage provided by a constant voltage unit, it should be understood that the voltage of the first voltage limiting module 31 is higher than the driving voltage of the column data line 8, and then the driving voltage of the column data line 8 is pulled down by the voltage transmission circuit 7 when the first control switch 4 is turned on, so as to increase the gray scale of the LED on the column data line 8.
In some examples, when the gray scale needs to be increased, the first timing controller 32 is configured to output at least one first control signal in a period of the frequency doubling signal, so as to turn on the first control switch 4, and the first voltage limiting module 31 pulls down the driving voltage of the column tube data line 8, so as to increase the gray scale of the LEDs on the column tube data line 8; specifically, as shown in fig. 9, t1 is a width of a gray scale of a clock signal in a period, the first timing controller 32 outputs a first control signal in a period of a frequency doubling signal to turn on the first control switch 4 to pull down the driving voltage of the column data line 8, so that the column data line 8 outputs a gray scale t2, and t2 is a width of a gray scale of a frequency doubling signal in a period, because the period of the frequency doubling signal is shorter than the period of the clock signal, the pulse width of the gray scale t2 is shorter than the pulse width of the gray scale t1, so that a gray scale t2 can be added on the basis of the original gray scale n and gray scale n +1, thereby avoiding directly adding a gray scale t1, and achieving the purpose of adding a new gray scale and making the display effect finer. It should be appreciated that the pulse width of the gray level t2 is related to the multiple of the frequency division, and the higher the multiple, the smaller the pulse width of the gray level t 2.
It should be understood that the present embodiment does not limit the position of increasing the gray t2, and the first timing controller 32 is configured to output the first control signal to turn on the first control switch 4 to increase the gray t2 when the gray needs to be increased, as shown in fig. 10; in some examples, the first timing controller 32 may further output a plurality of first control signals according to actual requirements within a period of the frequency doubling signal to increase the plurality of grayscales t 2. It should be understood that the present embodiment is not limited to the method of identifying whether to add the gray scale, for example, the gray scale may be monitored by a sensor to identify whether to add the gray scale; or when the relevant designer debugs the LED gray scale on the column tube data line 8 externally, the LED gray scale is debugged to judge whether the gray scale needs to be increased.
In some examples of the embodiment, the first control signal and the second control signal are opposite signals, wherein the first control signal and the second control signal may be one of a high level signal and a low level signal, and when the first control signal is a high level signal, the second control signal is a low level signal, it should be understood that the first control signal can enable the first control switch 4 to be in an on state, and the second control signal can enable the second control switch to be in an off state.
In some examples of the present embodiment, the signal generating unit 3 further includes: a voltage speed controller 33; the voltage speed controller 33 is disposed between the first voltage limiting module 31 and the voltage transmission circuit 7, and is configured to control a speed of pulling down the driving voltage of the column data line 8 when the first control switch 4 is turned on. Wherein the voltage speed controller 33 includes but is not limited to: resistance, as shown in FIG. 11; the resistor can be a fixed resistor or a variable resistor. When the voltage speed controller 33 is a resistor, the larger the resistance of the resistor is, the slower the speed of the state of pulling down the driving voltage of the column pipe data line 8.
In some examples of the present embodiment, as shown in fig. 12, the signal generation unit 3 further includes: a second voltage limiting module 34, where the second voltage limiting module 34 is connected to the first end of the first control switch 4 through the voltage transmission circuit 7, and is configured to pull up the driving voltage of the column tube data line 8 when the first control switch 4 is turned on, so as to reduce the LED grayscale on the column tube data line 8; a second timing controller 35, configured to output at least one first control signal in a period of the frequency doubling signal when the display unit 9 needs to reduce the gray scale, and transmit the at least one first control signal to the control terminal of the first control switch 4 through the signal transmission circuit 6, where the first control signal is used to turn on the first control switch 4; the second timing controller 35 is further configured to output at least one second control signal in the period of the frequency doubling signal when the display unit 9 does not need to reduce the gray scale, and transmit the second control signal to the control terminal of the first control switch 4 through the signal transmission circuit 6, where the second control signal is used to turn off the first control switch 4.
Taking the above example as an example, in some examples, the voltage of the second voltage limiting module 34 may be a voltage provided by a constant voltage unit, and it should be understood that the voltage of the second voltage limiting module 34 is higher than the driving voltage of the column tube data line 8, so as to pull up the driving voltage of the column tube data line 8 through the voltage transmission circuit 7 when the first control switch 4 is turned on, thereby reducing the LED gray scale on the column tube data line 8.
In some examples, when the display unit 9 needs to reduce the gray scale, the second timing controller 35 is configured to output at least one first control signal in a period of the frequency doubling signal, so as to turn on the first control switch 4, and the second voltage limiting module 34 pulls up the driving voltage of the column tube data line 8 to reduce the gray scale of the LED on the column tube data line 8; specifically, as shown in fig. 13, t2 is the width of a gray scale in one period of a frequency doubling signal, because the period of the frequency doubling signal is shorter than the period of the clock signal, and therefore, the pulse width of the gray scale t2 is shorter than the pulse width of the gray scale corresponding to one period of the clock signal, that is, one gray scale t2 can be reduced on the basis of the original gray scale n and gray scale n-1, thereby avoiding directly reducing the gray scale corresponding to 1 period of 1 clock signal, and achieving the purpose of reducing the gray scale and making the display effect finer. It should be appreciated that the pulse width of the gray level t2 is related to the multiple of the frequency division, and the higher the multiple, the smaller the pulse width of the gray level t 2.
It should be understood that the second timing controller 35 is configured to output the first control signal to turn on the first control switch 4 when the gray scale reduction is required, and in some examples, a plurality of first control signals may be output during the period of the frequency doubling signal according to actual requirements to achieve a plurality of gray scales t2 reduction. It should be understood that the present embodiment is not limited to the method of identifying whether the reduction of the gray scale is required, for example, the gray scale may be monitored by a sensor to identify whether the reduction of the gray scale is required; or when the relevant designer debugs the LED gray scale on the column tube data line 8 externally, the relevant designer debugs the LED gray scale to judge whether the gray scale needs to be reduced.
It should be understood that the first timing controller 32, the first voltage limiting module 31, the second timing controller 35, and the second voltage limiting module 34 may be disposed in the signal generating unit 3 at the same time to achieve the effect of increasing and decreasing the gray scale.
In some examples of the present embodiment, as shown in fig. 14, the first control switch 4 includes, but is not limited to: a field effect transistor; the control end of the field effect transistor is connected with the signal generating unit 3 through the signal transmission circuit 6, the first end of the field effect transistor is connected with the signal generating unit 3 through the voltage transmission circuit 7, and the second end of the field effect transistor is connected with the output end of the column tube data line 8; the field effect transistor is used for being turned on or turned off according to the control signal, so that the signal generating unit 3 changes the LED gray scale on the column tube data line 8 through the voltage transmission circuit 7 when the field effect transistor is in an on state.
In some examples of the present embodiments, the field effect transistor includes, but is not limited to: one of an N-type field effect transistor and a P-type field effect transistor, when the field effect transistor is the N-type field effect transistor, the gate of the N-type field effect transistor is a control end, the source is a first end, and the drain is a second end, the control end of the N-type field effect transistor is connected with the signal transmission circuit 6 and the first timing controller 32, the source of the N-type field effect transistor is connected with the first voltage limiting module 31 through the voltage transmission circuit 7, the drain of the field effect transistor is connected with the output end of the column tube data line 8, so that the control end receives a first control signal, and when the source and the drain are turned on, the voltage of the output end of the column tube data line 8 is pulled down through the voltage transmission circuit 7, and the LED gray scale on the column tube data line 8 is increased. At this time, the first control signal is a high level signal, and the second control signal is a low level signal.
In some examples, when the field effect transistor is an N-type field effect transistor, the gate of the N-type field effect transistor is a control terminal, the drain of the N-type field effect transistor is a first terminal, and the source of the N-type field effect transistor is a second terminal, the control terminal of the N-type field effect transistor is connected to the signal transmission circuit 6 and the second timing controller 35, the drain of the N-type field effect transistor is connected to the second voltage limiting module 34 through the voltage transmission circuit 7, the source of the field effect transistor is connected to the output terminal of the column tube data line 8, so that the control terminal receives the first control signal, and when the source and the drain are turned on, the voltage of the output terminal of the column tube data line 8 is pulled up through the voltage transmission circuit 7, and the LED gray scale on the column tube data line 8 is reduced. At this time, the first control signal is a high level signal, and the second control signal is a low level signal.
It should be understood that, when the fet is a pfet, the gate of the pfet is a control terminal, the drain of the pfet is a first terminal, and the source of the pfet is a first terminal, the control terminal of the pfet is connected to the signal transmission circuit 6 and the first timing controller 32, the drain of the pfet is connected to the first voltage limiting module 31 through the voltage transmission circuit 7, and the source of the fet is connected to the output terminal of the column data line 8, so that when the control terminal receives the first control signal, and the source and the drain of the fet are turned on, the voltage at the output terminal of the column data line 8 is pulled down through the voltage transmission circuit 7, thereby increasing the LED grayscale on the column data line 8. At this time, the first control signal is a low level signal, and the second control signal is a high level signal.
In some examples, when the fet is a P-type fet, the gate of the P-type fet is a control terminal, the source of the P-type fet is a first terminal, and the drain of the P-type fet is a second terminal, the control terminal of the P-type fet is connected to the signal transmission circuit 6 and the first timing controller 32, the source of the P-type fet is connected to the first voltage limiting module 31 through the voltage transmission circuit 7, the drain of the fet is connected to the output terminal of the column data line 8, and when the control terminal receives a first control signal, the voltage at the output terminal of the column data line 8 is increased through the voltage transmission circuit 7 to reduce the LED gray scale on the column data line 8. At this time, the first control signal is a low level signal, and the second control signal is a high level signal.
It should be understood that the present embodiment does not limit the first control switch 4 to be a field effect transistor, and the first control switch 4 may be other switches capable of turning on or off and limiting the current direction according to the control signal.
Based on the same concept, the present embodiment further provides a display device, as shown in fig. 15, a plurality of row pipe data lines and a plurality of column pipe data lines 8, wherein a display unit 9 is disposed between each row pipe data line and each column pipe data line 8, and an output end of at least one column pipe data line 8 is provided with the gray scale compensation circuit 1.
Wherein, the kinds of the display unit 9 include but are not limited to: at least one of a Micro Light Emitting Diode (Micro LED), a Mini LED (Mini Light Emitting Diode, MiniLED), and the like. The display unit 9 comprises a red light display unit, a green light display unit and a blue light display unit; or, the display unit 9 includes a red light display unit, a green light display unit, a blue light display unit, and a yellow light display unit.
Alternative embodiment of the invention
The present embodiment provides a gray scale compensation method, as shown in fig. 16, which includes but is not limited to:
s101, receiving a clock signal transmitted by an output end of the clock signal through a signal synchronization unit, carrying out frequency multiplication on the clock signal to obtain a frequency multiplication signal, and transmitting the frequency multiplication signal to a signal generation unit;
s102, outputting at least one control signal to a control end of a first control switch in the period of the frequency multiplication signal through the signal generation unit, wherein the control signal is used for switching on or switching off the first control switch;
s103, the signal generating unit changes the gray scale of the LED on the column tube data line when the first control switch is in a conducting state.
According to the gray scale compensation method, the first control signal is sent out when the luminous brightness of the display unit exceeds the threshold value so as to change the driving voltage for driving the display unit, so that the display unit does not emit light within the time of the first control signal, the brightness of the display unit is reduced, the problem of excessive brightness of the display unit is solved, and the integral display uniformity of the display unit is improved when a plurality of display units are provided.
In some embodiments, the signal generating unit, when the first control switch is in a conducting state, changing the gray scale of the LED on the column tube data line includes: when the first control switch is switched on, the signal generating unit pulls down the driving voltage of the column tube data line to increase the gray scale of the LED on the column tube data line.
The present embodiments also provide a computer-readable storage medium that includes volatile or non-volatile, removable or non-removable media implemented in any method or technology for storage of information such as instructions, data structures, computer program modules or other data. Computer-readable storage media include, but are not limited to, RAM (Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash Memory or other Memory technology, CD-ROM (Compact disk Read-Only Memory), Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer.
The computer readable storage medium in this embodiment may be used to store one or more computer programs, which stored one or more computer programs may be executed by a processor to implement at least one step of the above-described gray scale compensation method.
It will be apparent to those skilled in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software (which may be implemented in computer program code executable by a computing device), firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit.
In addition, communication media typically embodies instructions, data structures, computer program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art. Thus, the present invention is not limited to any specific combination of hardware and software.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (9)
1. A gray scale compensation circuit, characterized in that the gray scale compensation circuit comprises:
the device comprises a signal synchronization unit, a signal generation unit and a first control switch;
one end of the signal synchronization unit is connected with the output end of a clock signal, the other end of the signal synchronization unit is connected with the input end of the signal generation unit, the signal generation unit is connected with the control end of the first control switch through a signal transmission circuit, the signal generation unit is also connected with the first end of the first control switch through a voltage transmission circuit, and the second end of the first control switch is connected with the output end of the tube array data line;
the signal synchronization unit is used for receiving a clock signal transmitted by an output end of the clock signal, performing frequency multiplication on the clock signal to obtain a frequency multiplication signal, and transmitting the frequency multiplication signal to the signal generation unit, wherein the signal generation unit outputs at least one control signal in a period of the frequency multiplication signal, and the control signal is used for switching on or switching off the first control switch; and the signal generating unit changes the gray scale of the LED on the column tube data line through the voltage transmission circuit when the first control switch is in a conducting state.
2. A gray scale compensation circuit as defined in claim 1, wherein said signal generating unit comprises:
the first voltage limiting module is connected with the first end of the first control switch through the voltage transmission circuit and used for pulling down the driving voltage of the column tube data line when the first control switch is conducted so as to increase the gray scale of the LED on the column tube data line;
the first time sequence controller is used for outputting at least one first control signal in the period of the frequency doubling signal when the gray scale needs to be increased, and transmitting the first control signal to the control end of the first control switch through the signal transmission circuit, wherein the first control signal is used for conducting the first control switch;
the first time schedule controller is also used for outputting at least one second control signal in the period of the frequency doubling signal when the gray scale does not need to be increased, and transmitting the second control signal to the control end of the first control switch through the signal transmission circuit, wherein the second control signal is used for cutting off the first control switch.
3. A gray scale compensation circuit as defined in claim 2, wherein said signal generation unit further comprises: a voltage speed controller;
the voltage speed controller is arranged between the first voltage limiting module and the voltage transmission circuit and used for controlling the speed of pulling down the driving voltage of the column tube data line when the first control switch is conducted.
4. A gray scale compensation circuit as defined in claim 1, wherein said signal generating unit comprises:
the second voltage limiting module is connected with the first end of the first control switch through the voltage transmission circuit and used for pulling up the driving voltage of the column tube data line when the first control switch is conducted so as to reduce the gray scale of the LED on the column tube data line;
the second time schedule controller is used for outputting at least one first control signal in the period of the frequency doubling signal when the gray scale needs to be reduced, and transmitting the first control signal to the control end of the first control switch through the signal transmission circuit, wherein the first control signal is used for conducting the first control switch;
the second time schedule controller is also used for outputting at least one second control signal in the period of the frequency doubling signal when the gray scale does not need to be reduced, and transmitting the second control signal to the control end of the first control switch through the signal transmission circuit, wherein the second control signal is used for cutting off the first control switch.
5. A gray scale compensation circuit as claimed in any one of claims 1 to 4, wherein said first control switch comprises:
the control end of the field effect transistor is connected with the signal generating unit through the signal transmission circuit, the first end of the field effect transistor is connected with the signal generating unit through the voltage transmission circuit, and the second end of the field effect transistor is connected with the output end of the column tube data line;
the field effect transistor is used for being turned on or turned off according to the control signal, so that the signal generation unit changes the gray scale of the LED on the column tube data line through the voltage transmission circuit when the field effect transistor is in a turned-on state.
6. A display device, comprising a plurality of row pipe data lines and a plurality of column pipe data lines, wherein a display unit is disposed between each row pipe data line and each column pipe data line, and an output terminal of at least one column pipe data line is provided with the gray scale compensation circuit according to any one of claims 1 to 5.
7. The display device of claim 6, wherein the display unit comprises a red display unit, a green display unit, and a blue display unit;
or the like, or, alternatively,
the display unit comprises a red light display unit, a green light display unit, a blue light display unit and a yellow light display unit.
8. A gray scale compensation method applied to the gray scale compensation circuit according to any one of claims 1 to 5, the gray scale compensation method comprising:
receiving a clock signal transmitted by an output end of the clock signal through a signal synchronization unit, carrying out frequency multiplication on the clock signal to obtain a frequency multiplication signal, and transmitting the frequency multiplication signal to a signal generation unit;
outputting at least one control signal to a control end of a first control switch in the period of the frequency doubling signal through the signal generating unit, wherein the control signal is used for switching on or switching off the first control switch;
and the signal generating unit changes the gray scale of the LED on the column tube data line when the first control switch is in a conducting state.
9. The gray scale compensation method of claim 8, wherein the signal generating unit changing the gray scale of the LED on the column tube data line when the first control switch is in an on state comprises:
when the first control switch is switched on, the signal generating unit pulls down the driving voltage of the column tube data line to increase the gray scale of the LED on the column tube data line.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110950582.XA CN114038398B (en) | 2021-08-18 | 2021-08-18 | Gray scale compensation circuit, display device and gray scale compensation method |
| PCT/CN2022/111823 WO2023020361A1 (en) | 2021-08-18 | 2022-08-11 | Grayscale compensation circuit, display apparatus, and grayscale compensation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110950582.XA CN114038398B (en) | 2021-08-18 | 2021-08-18 | Gray scale compensation circuit, display device and gray scale compensation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114038398A CN114038398A (en) | 2022-02-11 |
| CN114038398B true CN114038398B (en) | 2022-09-13 |
Family
ID=80139833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110950582.XA Active CN114038398B (en) | 2021-08-18 | 2021-08-18 | Gray scale compensation circuit, display device and gray scale compensation method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114038398B (en) |
| WO (1) | WO2023020361A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114038396B (en) * | 2021-08-17 | 2022-10-21 | 重庆康佳光电技术研究院有限公司 | Drive compensation circuit, display device and drive method of display unit |
| CN114038398B (en) * | 2021-08-18 | 2022-09-13 | 重庆康佳光电技术研究院有限公司 | Gray scale compensation circuit, display device and gray scale compensation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102708803A (en) * | 2012-06-27 | 2012-10-03 | 重庆邮电大学 | Method for realizing gray scale controllability of LED (Light-Emitting Diode) constant-current driver and constant-current driver |
| CN106663405A (en) * | 2014-08-05 | 2017-05-10 | 德州仪器公司 | Pre-discharge circuit for multiplexed LED display |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3361705B2 (en) * | 1996-11-15 | 2003-01-07 | 株式会社日立製作所 | Liquid crystal controller and liquid crystal display |
| JPH11133921A (en) * | 1997-10-28 | 1999-05-21 | Sharp Corp | Display control circuit and display control method |
| TW582000B (en) * | 2001-04-20 | 2004-04-01 | Semiconductor Energy Lab | Display device and method of driving a display device |
| CN102006696B (en) * | 2009-09-02 | 2013-10-23 | 北京京东方光电科技有限公司 | Light-emitting diode backlight drive circuit, method and constant current source thereof |
| CN103390387B (en) * | 2013-07-23 | 2015-10-21 | 深圳市明微电子股份有限公司 | A kind of frequency multiplication display control method and system |
| CN209691363U (en) * | 2019-05-08 | 2019-11-26 | 深圳市富满电子集团股份有限公司 | A kind of LED drive chip |
| CN110277052B (en) * | 2019-06-13 | 2020-08-04 | 华中科技大学 | Full-color LED driver chip and driving method with multi-line scanning and high refresh rate |
| CN112309309B (en) * | 2019-07-25 | 2021-08-06 | 米彩股份有限公司 | Display driver module and its control method and display driver system |
| CN110996441B (en) * | 2019-11-29 | 2021-06-25 | 广州市雅江光电设备有限公司 | Dimming method of LED driving device |
| CN111314685B (en) * | 2020-02-17 | 2024-02-27 | 深圳市时代华影科技股份有限公司 | LED video display system and display method thereof |
| CN111161670B (en) * | 2020-03-02 | 2022-03-29 | 南京浣轩半导体有限公司 | Multi-line scanning and line changing display method and chip |
| CN212934114U (en) * | 2020-07-29 | 2021-04-09 | 西安钛铂锶电子科技有限公司 | Display lamp panel and display device |
| CN113450704B (en) * | 2020-10-13 | 2022-04-19 | 重庆康佳光电技术研究院有限公司 | LED driving method, driving unit, display device and readable storage medium |
| CN112967664B (en) * | 2020-12-31 | 2022-06-21 | 重庆康佳光电技术研究院有限公司 | Drive circuit, display panel, drive method, and storage medium |
| CN114038398B (en) * | 2021-08-18 | 2022-09-13 | 重庆康佳光电技术研究院有限公司 | Gray scale compensation circuit, display device and gray scale compensation method |
-
2021
- 2021-08-18 CN CN202110950582.XA patent/CN114038398B/en active Active
-
2022
- 2022-08-11 WO PCT/CN2022/111823 patent/WO2023020361A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102708803A (en) * | 2012-06-27 | 2012-10-03 | 重庆邮电大学 | Method for realizing gray scale controllability of LED (Light-Emitting Diode) constant-current driver and constant-current driver |
| CN106663405A (en) * | 2014-08-05 | 2017-05-10 | 德州仪器公司 | Pre-discharge circuit for multiplexed LED display |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023020361A1 (en) | 2023-02-23 |
| CN114038398A (en) | 2022-02-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110085164B (en) | Display panel and display device | |
| US12148356B2 (en) | Pixel circuit, display panel and control method | |
| CN111341267B (en) | Pixel circuit and driving method thereof | |
| CN114038398B (en) | Gray scale compensation circuit, display device and gray scale compensation method | |
| CN112017589A (en) | Multi-gray-scale pixel driving circuit and display panel | |
| US20070171180A1 (en) | Light source driving circuit, lighting apparatus, display apparatus, field sequential color liquid crystal display apparatus, and information appliance | |
| CN113570999B (en) | Display panel and display device | |
| CN103198788A (en) | Pixel circuit, organic electroluminescence display panel and display device | |
| TWI774332B (en) | Display device and driver thereof | |
| CN114299860A (en) | Pixel driving circuit and driving method thereof, display panel and display device | |
| CN118355426A (en) | Display panel drive circuit | |
| CN112967665B (en) | Light emitting element control circuit, display panel and display device | |
| CN114038396B (en) | Drive compensation circuit, display device and drive method of display unit | |
| US20240144868A1 (en) | Pixel circuit with pulse width compensation and operation method thereof | |
| CN203085137U (en) | Pixel circuit, organic electroluminescence display panel and display device | |
| WO2024032340A1 (en) | Display panel, display panel driving method, and display device | |
| CN112017600A (en) | Driving device and method of liquid crystal display panel and display device | |
| CN114299870A (en) | Drive circuit and display panel | |
| TW202405785A (en) | Pixel circuit and display panel | |
| CN113593476A (en) | Light-emitting control circuit and mobile terminal | |
| CN112863449B (en) | Light-emitting control circuit, driving method thereof, display panel and display device | |
| CN108806588B (en) | Light-emitting control circuit, light-emitting control method and shift register | |
| US12211432B2 (en) | Display panel and display apparatus | |
| CN117456896B (en) | Pixel driving circuit | |
| US20250111820A1 (en) | Pixel driving circuit and display panel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 402760 No.69, Wushan Road, Biquan street, Bishan District, Chongqing Patentee after: Chongqing Kangjia Optoelectronic Technology Co.,Ltd. Country or region after: China Address before: 402760 No.69, Wushan Road, Biquan street, Bishan District, Chongqing Patentee before: Chongqing Kangjia Photoelectric Technology Research Institute Co.,Ltd. Country or region before: China |