CN115064131B - Display backlight control system capable of monitoring picture for display - Google Patents
Display backlight control system capable of monitoring picture for display Download PDFInfo
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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Abstract
The invention discloses a display backlight control system capable of monitoring pictures for a display, which comprises a display screen light data module, an ambient light data acquisition module, a PID algorithm control module, an algorithm module, a backlight control system and an LED backlight module, wherein the output ends of the display screen light data module and the ambient light data acquisition module are connected with the input end of the PID algorithm control module. The invention outputs a control data range of the backlight control system by calculating the acquired environmental brightness, environmental color and image quality data to be displayed through a PID algorithm, and then optimizes the weight and threshold of the BP neural network algorithm through a genetic algorithm to finally obtain the control data of the optimal backlight control system, so that the real color generation result of the display picture is the same as the color generation expressed by the display signal module, thereby avoiding the occurrence of the condition that human eyes perceive the image quality of the display to be deviated due to the switching of the light source.
Description
Technical Field
The invention relates to the technical field of display backlight, in particular to a display backlight control system capable of monitoring pictures for a display.
Background
Backlights are a form of illumination used in the electronics industry and are commonly used for LCD displays. The backlight type is different from the front type in that the backlight is irradiated from the side or the back, and the front light is irradiated from the front as the name suggests. The main liquid crystal backlight technologies in the market comprise an LED (light emitting diode) and a CCFL (cold cathode fluorescent lamp), wherein the CCFL is gradually eliminated by the market, and the LED backlight is divided into a side-in backlight, a side-in subarea backlight and a miniLED subarea backlight, wherein the miniLED subarea backlight is an integral whole of a full-array direct type backlight, tens of thousands of very small LED lamp beads are used as the backlight, and the method has a more precise light control technology.
The brightness of the display is not higher and better, but the brightness of the display is changed correspondingly according to different use environments, but in the prior art, when the display is actually used, only the brightness is adjusted, but the characteristics of a light source are ignored, the natural light and the spectrum of the artificial light source in the daytime have differences, namely the color temperature of the natural light and the color temperature of the artificial light source have differences, when the color temperature has differences, the saturation of the color generation of the display is reduced due to the blending of the external environment light, so that the image quality of the display sensed by human eyes can have differences, and therefore users in high-end color technology work can be affected, for example, the images displayed by some image processing works under different light sources have differences, and further the judgment of the workers is affected.
Disclosure of Invention
The present invention is directed to a display backlight control system for monitoring a display, so as to solve the above problems in the related art.
In order to achieve the purpose, the invention provides the following technical scheme: the LED backlight module comprises a display screen optical data module, an ambient light data acquisition module, a PID algorithm control module, an algorithm module, a backlight control system and an LED backlight module, wherein the output ends of the display screen optical data module and the ambient light data acquisition module are connected with the input end of the PID algorithm control module, the connecting end of the PID algorithm control module is bidirectionally connected with the connecting end of the algorithm module, the output end of the PID algorithm control module is connected with the input end of the backlight control system, the output end of the backlight control system is connected with the input end of the LED backlight module, the ambient light data acquisition module comprises a data processing module, a digital-to-analog conversion module and a data input module, and the data input module comprises a light intensity detection module for acquiring light intensity data and a color detection module for acquiring color data;
the LED backlight module comprises a subarea backlight driving module, a brightness adjusting driving module, a backlight subarea module and an LED backlight lamp, wherein the output end of the subarea backlight driving module is connected with the input end of the backlight subarea module, and the output end of the brightness adjusting driving module is connected with the input end of the LED backlight lamp;
the backlight partition module comprises a light guide plate, a first transparent electrode film, an electrostriction film and a second transparent electrode film, wherein the second transparent electrode film and the first transparent electrode film correspond to two groups of ITO linear electrodes which are parallel in the X direction and the Y direction at photoetching positions on one side of the electrostriction film, and the intersection point positions of the ITO linear electrodes correspond to liquid crystal pixel points of the display.
Preferably, the output end of the data input module is connected to the input end of the digital-to-analog conversion module, the output end of the digital-to-analog conversion module is connected to the input end of the data processing module, and the data processing module is configured to process the data transmitted by the data input module, where the data processing module is configured to convert the color data transmitted by the color detection module into color temperature data through calculation.
Preferably, the display screen optical data module comprises a signal decoding module for decoding the input signal of the display and a display signal module for converting the data of the signal decoding module into the display digital signal.
Preferably, the algorithm module is a BP neural network algorithm based on a genetic algorithm, and the backlight control system is used for driving the LED backlight module to perform backlight adjustment.
Preferably, the light guide plate, the first transparent electrode film, the electrostrictive film and the second transparent electrode film are sequentially and closely attached, and a reflective film is attached to one side of the electrostrictive film, which corresponds to the first transparent electrode film.
Preferably, the first reflector panel of one end fixedly connected with that electrostrictive film position was kept away from to the transparent electrode film of second, first reflector panel is inside cavity and both ends are opening structure's frame shape structure, the LED backlight includes the formula of inclining and is shaded LED, and first reflector panel both ends opening position and the formula of inclining and be shaded LED fixed connection, the inner wall of the corresponding transparent electrode film position of second of first reflector panel is flute column structure, and the inclination of first reflector panel inner wall flute column structure is 5, the inner wall coating of first reflector panel has the reflecting paint, first hole has all been seted up at the middle part of ITO linear electrode crossing point position in the one end lateral wall of the corresponding transparent electrode film position of second of first reflector panel and the corresponding transparent electrode film of electrostrictive film and reflector panel, and the one end of the corresponding light guide panel position of first hole is the flaring formula structure.
Preferably, the one end fixedly connected with second reflector panel that electrostrictive film position was kept away from to the transparent electrode film of second, the second reflector panel is inside hollow frame structure, the LED backlight includes miniLED banks, and miniLED banks fixed connection keeps away from the one end inner wall of the transparent electrode film position of second at the second reflector panel, the inner wall of the corresponding transparent electrode film position of second reflector panel is flute column structure, and the inclination of second reflector panel inner wall flute column structure is 5, the inner wall coating of second reflector panel has the reflecting paint, the second hole has all been seted up at the middle part of ITO linear electrode crossing point position in the one end lateral wall of the corresponding transparent electrode film position of second reflector panel and the corresponding transparent electrode film of electrostrictive film and reflector panel, and the one end of the corresponding light guide plate position of second is flaring formula structure.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the acquired environmental brightness, environmental color and image quality data to be displayed are calculated through a PID algorithm, a control data range of a backlight control system is output, then the weight and the threshold of a BP neural network algorithm are optimized through a genetic algorithm, and finally the control data of the optimal backlight control system is obtained, so that the real color generation result of a display picture is the same as the color generation expressed by a display signal module, and the condition that human eyes sense the image quality of the display to generate deviation due to the switching of a light source is avoided;
2. the invention also quickly responds to the intersection point position of the ITO linear electrode by electrifying the electrostrictive film to shrink and seal the first hole, at the same time, the first hole at the position does not emit light or shield part of light rays, and quickly restores to the initial position when the power is off, namely, the first hole penetrates out of light beams, thus realizing the purpose of locally controlling the light source.
Drawings
FIG. 1 is a block diagram of an overall structure of a backlight control system for a monitor capable of monitoring images for a display according to the present invention;
FIG. 2 is a schematic block diagram illustrating the control of the display screen light data module of the display backlight control system for monitoring images according to the present invention;
FIG. 3 is a block diagram illustrating the structural control of an ambient light data collection module of a backlight control system for a monitor capable of monitoring images according to the present invention;
FIG. 4 is a block diagram illustrating the control principle of the data input module structure of the backlight control system for monitor display according to the present invention;
FIG. 5 is a schematic block diagram illustrating the control of the LED backlight module of the display backlight control system for monitoring images according to the present invention;
FIG. 6 is a schematic block diagram of an algorithm module structure of a backlight control system for monitor screen display according to the present invention;
FIG. 7 is a front cross-sectional view of a first reflector structure of a display backlight control system for monitoring images for a display according to the present invention;
FIG. 8 is a sectional view of a first reflector of a display backlight control system for monitoring images;
FIG. 9 is a front cross-sectional view of a second reflector structure of a display backlight control system capable of monitoring images for a display according to the present invention.
In the figure: 1. a display screen optical data module; 101. a signal decoding module; 102. a display signal module; 2. an ambient light data acquisition module; 21. a data processing module; 22. a digital-to-analog conversion module; 23. a data input module; 231. a light intensity detection module; 232. a color detection module; 3. a PID algorithm control module; 4. an algorithm module; 5. a backlight control system; 6. an LED backlight module; 61. a partition backlight driving module; 62. a brightness adjustment driving module; 63. a backlight partition module; 64. an LED backlight; 7. a light guide plate; 8. a first transparent electrode film; 9. an electrostrictive film; 10. a second transparent electrode film; 11. a first reflector; 12. a second reflector; 13. a side-entry backlight LED; 14. a miniLED lamp group; 15. a first hole; 16. a second aperture.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example one
Referring to fig. 1-6, the present invention provides a technical solution: the LED backlight system comprises a display screen optical data module 1, an ambient light data acquisition module 2, a PID algorithm control module 3, an algorithm module 4, a backlight control system 5 and an LED backlight module 6, wherein the output ends of the display screen optical data module 1 and the ambient light data acquisition module 2 are connected with the input end of the PID algorithm control module 3, the connecting end of the PID algorithm control module 3 is bidirectionally connected with the connecting end of the algorithm module 4, the output end of the PID algorithm control module 3 is connected with the input end of the backlight control system 5, the output end of the backlight control system 5 is connected with the input end of the LED backlight module 6, the ambient light data acquisition module 2 comprises a data processing module 21, a digital-to-analog conversion module 22 and a data input module 23, wherein the data input module 23 comprises a light intensity detection module 231 for acquiring light intensity data and a color detection module 232 for acquiring color data;
the output end of the data input module 23 is connected with the input end of the digital-to-analog conversion module 22, the output end of the digital-to-analog conversion module 22 is connected with the input end of the data processing module 21, and the data processing module 21 is used for processing the data transmitted by the data input module 23, wherein the data processing includes that the color data transmitted by the color detection module 232 is converted into color temperature data through calculation;
the display screen optical data module 1 comprises a signal decoding module 101 for decoding an input signal of a display and a display signal module 102 for converting the data of the signal decoding module 101 into a display digital signal;
the LED backlight module 6 comprises a subarea backlight driving module 61, a brightness adjusting driving module 62, a backlight subarea module 63 and an LED backlight 64, wherein the output end of the subarea backlight driving module 61 is connected with the input end of the backlight subarea module 63, the output end of the brightness adjusting driving module 62 is connected with the input end of the LED backlight 64, and the LED backlight 64 is an LED backlight lamp group;
the algorithm module 4 is a BP neural network algorithm based on a genetic algorithm, and the backlight control system 5 is used for driving the LED backlight module 6 to carry out backlight adjustment;
referring to fig. 7-9, the backlight partition module 63 includes a light guide plate 7, a first transparent electrode film 8, an electrostrictive film 9 and a second transparent electrode film 10, wherein the light guide plate 7, the first transparent electrode film 8, the electrostrictive film 9 and the second transparent electrode film 10 are sequentially and tightly attached to each other, the second transparent electrode film 10 and the first transparent electrode film 8 correspond to two sets of parallel ITO linear electrodes in the X direction and the Y direction at each lithography position on one side of the electrostrictive film 9, the intersection positions of the ITO linear electrodes correspond to liquid crystal pixels of the display, wherein the cathode is located on one side of the second transparent electrode film 10, and a reflective film is attached to one side of the electrostrictive film 9 corresponding to the first transparent electrode film 8;
adopt light intensity detection module 231, color detection module 232 and display screen light data module 1 in this application, light intensity detection module 231 and color detection module 232 mountable are in the display wherein certain frame position, and wherein light intensity detection module 231 is arranged in the light intensity of surveying the environment, and color detection module 232 is arranged in surveying what kind of colour temperature environment the display is located, and the colour temperature is the measurement unit who contains the colour composition in the expression light. Theoretically, the black body temperature refers to the color that an absolute black body would appear after warming from absolute zero (-273 ℃). After being heated, the black body gradually turns from black to red, turns yellow and becomes white, and finally emits blue light. When heated to a certain temperature, the light emitted by a black body contains spectral components, referred to as the color temperature at that temperature, measured in "K". If the light emitted from a certain light source has the same spectral components as the light emitted from a black body at a certain temperature, it is called a certain K color temperature. If the color of the light emitted from a 100W bulb is the same as the color of an absolute black body at 2527 ℃, then the color temperature of the light emitted from this bulb is: (2527 +273) K =2800K;
the composition of the spectrum can be known through the color temperature value, but pure blue, pure green and purple light can never be emitted when an absolute black body is heated, the color temperature representing the spectrum of a light source is detected by matching a color detection module 232 with a light intensity detection module 231, wherein the light intensity detection module 231 is a BH1750FVI illumination intensity sensor;
TABLE 1
Furthermore, we need to verify the problems in the background art, first, the color temperature of the light source is the spectral component of the light source, which is represented by the absolute temperature scale K, and the high and low of the color temperature represent the components of different colors of light contained in the spectral component of the light source, for example, the spectral component of the light source contains more red light components and the color temperature is low; the spectral components of the light source contain more blue light components, and the color temperature is high; it can be known from table 1 and the known spectral distributions of various light sources that there is a large deviation in color temperature between natural light and artificial light sources, and since the color temperature of the artificial light source with good quality generally does not change with the brightness of the light source, even if the adjusted brightness is not changed in the case of the spectral distribution, the color temperature will not change, when the natural light is converted into human labor, the spectral components of the light source will change, and further the reflected light of the object will be affected, so that the color of the surface of the object will change; for example, the achromatic object may appear colored when illuminated by a colored light source. A white object that appears red under red illumination; magenta appears under simultaneous irradiation of red light and blue light. Colored objects appear achromatic when illuminated by a particular light source. For example, an object that is green under white light becomes almost black under the illumination of a red light in a darkroom because the green object reflects only green light, and the red light has no green light component, and the object surface cannot reflect green light under the illumination of red light, and the red light is absorbed, thereby showing black. However, in the present document, the object to be considered is the display, so we need to know the principle of the color generation of the display;
further, the principle of color generation of the LCD is that, under the action of an electric field, liquid crystal molecules change in arrangement to affect the change in intensity of incident light beam passing through the liquid crystal, and the change in light intensity is further expressed as a change in brightness by the action of a polarizer to realize multi-gray scale backlight display, and the change in brightness of light can be realized by controlling the electric field of the liquid crystal to achieve the purpose of information display, when an electric field is generated by electrodes in the LCD, the liquid crystal molecules are twisted to regularly refract light passing therethrough, and the light is filtered by a second layer of polarizer to be displayed on a screen, because the liquid crystal material does not emit light, the LCD generally needs to be provided with a backlight source for a display panel, in a color LCD panel, each pixel generally consists of 3 liquid crystal unit cells, wherein each of the front surface of each unit cell has a red, green, or blue (RGB) color filter, and the color filter is constructed by changing the brightness in each of the pixels from 0 to 255, wherein the red, the green, or the blue (RGB) filter is black, and the red, the green, or the blue (255) all-white (RGB) display is full-white) display;
according to the principle of color generation of the display, the color generation of the display changes the brightness of the three-color filter, so that an extreme environment is set for the color generation of the display to prove that the ambient light has influence on the color generation effect of the display;
firstly, the display can normally generate color according to the brightness adjustment in a natural light environment, and human eyes perceive the normal image quality of the display;
secondly, the display can normally generate color according to the brightness of the display adjusted in a dark environment, and human eyes perceive the normal image quality of the display;
thirdly, the display is in a dark environment, and an external red light source is turned on, the display can be normally colored according to the brightness, but human eyes sense that the image quality of the display has larger deviation, namely, the red color in the display picture is strengthened;
fourthly, the display is in a dark environment, and an external green light source is turned on, the display can be normally colored according to the brightness, but human eyes sense that the image quality of the display has large deviation, namely the green color in the display picture is strengthened;
the above scenes do not affect the black display, but only the color display, and in conclusion, we have found that the spectral distribution of the ambient light does affect the image quality of the display perceived by the human eyes, i.e., it is verified that the problems mentioned in the background art do exist;
furthermore, in the technical scheme, the color temperature needs to be analyzed, the color temperature is a specific value, the amount of gray scale needing to be adjusted can be calculated by substituting the specific value of the color temperature into a formula, the principle of three primary colors can be used for knowing the color of the tested object if the component proportion of the three primary colors forming various colors is known. Wherein the color detection module 232 is a TCS3200 sensor, the TCS3200 is used for measuring the color of the external light source, an auxiliary white light source is usually required for detection, the TCS3200 detects the proportion of RGB components in the light of the external light source, so that the color of the external light source can be determined, for the TCS3200, when one color filter is selected, the color filter only allows the primary color of the set filter to pass through, and prevents other primary colors from passing through, so that the numerical values corresponding to the light intensities of the colors of red (R), green (G) and blue (B) can be respectively obtained. Through the three detected values, the color of light projected onto the TCS3200 sensor can be analyzed to obtain the values corresponding to the light intensities of the red (R), green (G) and blue (B) lights, and the interchange relation among the color coefficients of the three primary colors can be derived according to the standard D65 white light luminance equation Y =0.299r +0.587g +0.114b by using the XYZ color system and combining the color equation of the RGB three primary colors and the color equation of the standard three primary colors flie = X [ X ] + Y ] + Z [ Z ], and is written as a matrix:
wherein FLE is any color light, X, Y and Z are color coefficients, and [ X ], [ Y ], [ Z ] are primary color units.
The light source color coordinates can be obtained from the spectral tristimulus values X, Y, Z (also known as CIEl931 standard colorimetric observer) according to the color measurement principle specified by the international commission on illumination CIEl931 standard colorimetric system, and the color coordinates of the measured color are:
in the range of the color temperature value of 2500-10000K, a color temperature calculation formula is as follows:
in the above formula, the coefficient
Wherein x, y, z are color coordinates, CCT is correlated color temperature, and correlated color temperature value CCT of the measured light source is calculated, and the light can not emit pure blue light, green light and purple light, so that the light of all colors can not be represented by color temperature, and the light of all colors can not be represented by color temperature because the color temperature can not emit pure blue light, green light and purple light, at the moment, the numerical value input by the TCS3200 sensor is a numerical value corresponding to the light intensity of each of red (R), green (G) and blue (B), although the numerical value input by the TCS3200 sensor is larger than the calculated amount of the input of the color temperature, the calculation range of the artificial light source of the pure blue light, green light and purple light is small, so the numerical value input by the TCS3200 sensor is smaller than the calculated amount of the input of the color temperature valueThe method has small value calculation amount, high response speed and almost no influence on the decision calculation speed of the BP neural network algorithm optimized by the genetic algorithm;
further, the invention uses the light intensity detecting module 231 and the color detecting module 232 to share a light receiving point, so as to greatly reduce the size of the display, then the optimal LED backlight gray scale matrix is obtained by the PID algorithm control module 3 and the BP neural network algorithm based on the genetic algorithm through matching with the data transmitted by the light intensity detecting module 231, the color detecting module 232 and the display screen light sensor, the PID algorithm control module 3 sets an input value for the output result based on the BP neural network algorithm, for example, under the irradiation of red light in the dark, the brightness of the red light in the three-color filter is reduced under the calculation of the PID algorithm control module 3 and the BP neural network algorithm based on the genetic algorithm, that is, the gray scale at the rear side of the red light in the three-color filter is reduced, and the same is that under the irradiation of green light in the dark, under the calculation of a PID algorithm control module 3 and a BP neural network algorithm based on a genetic algorithm, the brightness of green light in a three-color filter is reduced according to data, namely the gray scale positioned at the rear side of the green light in the three-color filter is reduced, the PID algorithm control module 3 and the BP neural network algorithm based on the genetic algorithm are used for correspondingly adjusting the brightness proportion of RGB in the three-color filter according to information such as light source brightness, color and the like so as to improve the reality of color generation of a display, because the color generation of the display can be changed in various ways due to ambient light illumination, the defect can exist if the BP neural network algorithm is only based on, at the moment, the weight and the threshold of the BP neural network algorithm are optimized through the genetic algorithm, wherein a control approximate value is output through the calculation of the acquired ambient brightness, ambient color and LED backlight gray scale data required to be displayed through the PID algorithm, and then optimizing the weight and the threshold of the BP neural network algorithm by a genetic algorithm, and taking the LED backlight control level of which the human eyes sense the real image quality of the display as an output quantity to obtain the optimal LED backlight control decision. In the process control, the control is carried out according to the proportion (P), the integral (I) and the differential (D) of the deviation, when the device works, the light intensity detection module 231 carries out the collection of the light intensity, and the color detection module 232 carries out the collection of the color at the same time, and as the absolute black body can not emit pure blue, pure green and purple light at all when being heated, namely, the color temperature value can not replace the pure blue, pure green and purple light, the device can be divided into two data processing processes:
firstly, the data collected by the light intensity detection module 231 and the color detection module 232 are transmitted to the data processing module 21 through the digital-to-analog conversion module 22, wherein the data processing module 21 calculates the data collected by the color detection module 232, converts the data into a color temperature value and transmits the color temperature value to the PID algorithm control module 3,
secondly, when the light source condition of the external environment of pure blue, pure green and violet light is met, the data collected by the light intensity detection module 231 and the color detection module 232 are transmitted to the data processing module 21 through the digital-to-analog conversion module 22, the digital-to-analog conversion module 22 directly inputs the corresponding numerical value of the color to the data processing module 21 through the collected data of the color detection module 232, and the data processing module 21 performs simple classification processing on the numerical value and transmits the numerical value to the PID algorithm control module 3;
meanwhile, the signal decoding module 101 decodes the signal display data transmitted by the host and transmits the signal display data to the display signal module 102, at this time, the display signal module 102 is the real picture color information which we want to perceive, the display signal module 102 and the data processing module 21 simultaneously transmit the signal display data to the PID algorithm control module 3, wherein the PID algorithm control module 3 inputs the data output by the data processing module 21 as input data, and simultaneously, the data output by the display signal module 102 is taken as a decision value, and calculates the control data range of the backlight control system 5, and the PID algorithm control module 3 records the control data range into the algorithm module 4, and trains according to an error reverse propagation algorithm through a BP neural network algorithm based on a genetic algorithm, so as to continuously optimize and adjust the weight and the threshold value of the network, finally obtain the optimal control data, and issue a control command to the backlight control system 5 through the PID algorithm control module 3, so that the backlight control system 5 controls the partition module 63 and the LED 64 through the partition backlight driving module 61 and the brightness adjustment driving module 62 respectively, so that the real picture color result of the display is the same as the color rendering mode of the display signal module 102, and the spectrum quality of the backlight source can be perceived by human eyes, thereby avoiding the image display quality of the human eye from changing no matter what the host can be always perceived by the image display quality of the image display device;
example II
Referring to fig. 7-8, the present application further provides an embodiment, which is a side-in backlight mode, wherein one end of the second transparent electrode film 10 away from the position of the electrostrictive film 9 is fixedly connected with a first reflective plate 11, the first reflective plate 11 is a frame-shaped structure with a hollow interior and two open ends, the LED backlight 64 includes a side-in backlight LED13, the open ends of the two ends of the first reflective plate 11 are fixedly connected with the side-in backlight LED13, the inner wall of the first reflective plate 11 corresponding to the position of the second transparent electrode film 10 is corrugated, and the inclination angle of the corrugated structure of the inner wall of the first reflective plate 11 is 5 °, so as to avoid light from being refracted outwards as much as possible, thereby improving the utilization rate of the light source, wherein the surface of the second transparent electrode film 10 is the same as the glass substrate of the liquid crystal, matrix-type ITO linear electrodes are photo-etched in both the X direction and the Y direction, the device is used for controlling part of the electrostrictive film 9 to be electrified and quickly deformed, wherein the electrostrictive film 9, the reflective film and the first reflective plate 11 are respectively provided with a first hole 15 corresponding to the middle part of each intersection point of the ITO linear electrodes in the second transparent electrode film 10, the position of the first hole 15 corresponding to the light guide plate 7 is of a flaring structure, the first hole 15 can be used as a luminous source, when the ITO linear electrode at one position of the first hole 15 is electrified, the electrostrictive film 9 at the position can quickly react to contract towards the intersection point of the ITO linear electrodes and seal the first hole 15, the first hole 15 at the position does not emit light or shield part of light, and quickly returns to the initial position when the power is off, namely the first hole 15 has light beams which pass through, thus the purpose of locally controlling the light source can be realized, and the relative ratio of the prior LED side entering backlight mode is achieved, the partition control can be conveniently carried out, so that the picture color display is more real.
Example 3
Referring to fig. 9, the present application further provides an embodiment, which is a miniLED backlight mode, wherein one end of the second transparent electrode film 10 far from the position of the electrostrictive film 9 is fixedly connected with a second reflective plate 12, the second reflective plate 12 is a frame structure with a hollow interior, the LED backlight 64 includes a miniLED lamp group 14, the miniLED lamp group 14 is fixedly connected to an inner wall of one end of the second reflective plate 12 far from the position of the second transparent electrode film 10, the inner wall of the second reflective plate 12 corresponding to the position of the second transparent electrode film 10 is corrugated, an inclination angle of the corrugated structure of the inner wall of the second reflective plate 12 is 5 °, the inner wall of the second reflective plate 12 is coated with reflective paint, one end of the second reflective plate 12 corresponding to the position of the second transparent electrode film 10 and a middle portion of the position of an ITO linear electrode intersection in the electrostrictive film 9 and reflective film corresponding to the second transparent electrode film 10 are both provided with a second hole 16, and one end of the second hole 16 corresponding to the hole 7 is a light guide plate structure, wherein the surface of the second transparent electrode film 10 is the same as a glass substrate of the liquid crystal, a Y, a cross point of the ITO linear electrode film is provided with a linear light guide plate 16, and a linear ITO linear light guide plate is provided with a linear light source for controlling a linear ITO linear light source, wherein the ITO linear light source, the ITO linear light guide plate 7, the ITO linear light source 16, the linear light guide plate 7, at this moment, the second hole 16 at the position does not emit light or shields part of light, the light is quickly restored to the initial position when the power is off, and the light beam penetrates through the second hole 16, so that the purpose of locally controlling the light source can be realized, and simultaneously, compared with the existing miniLED backlight mode, extremely fine partition control can be realized, so that the picture color display is more real, compared with the second embodiment, the installation position of the LED backlight 64 is only changed in the embodiment, and the inner walls of the first reflector 11 and the second reflector 12 in the second embodiment and the third embodiment are both coated with reflective materials, so that the light utilization rate is higher;
in the second and third embodiments, the thickness of the electrostrictive film 9 is 1MM, the thicknesses of the first transparent electrode film 8 and the second transparent electrode film 10 are both less than 1MM, and the inner diameters of the first hole 15 and the second hole 16 are not greater than 1MM, wherein to ensure sufficient extensibility of the electrostrictive film 9, the ratio of the hole area to the physical area of the electrostrictive film 9 should be maintained at 1, and the electrostrictive film 9 can drive the electrostrictive film to contract and deform at low voltage, the two embodiments have more flexible zone control compared with the existing LED side-entry type backlight mode, the three embodiments have greatly reduced number of LED lamps compared with the existing miniLED backlight mode, the two embodiments and the three embodiments have much smaller thickness than the liquid crystal panel compared with the existing double liquid crystal display, the combination precision of the first transparent electrode film 8, the electrostrictive film 9 and the second transparent electrode film 10 is high without the liquid crystal display panel, but the combination of the first transparent electrode film 8, the electrostrictive film 9 and the second transparent electrode film 10 is undoubtedly good in gray scale control effect of backlight and lower in cost compared with the corresponding liquid crystal, moreover, according to the regulations on the safe service life of flat panel televisions formulated by the association of the electronic video industry of China, it is clear that the safe service life of household flat panel televisions sold and used in China is seven years, namely the service life of a liquid crystal television is only 7 years, but the service life of the electrostrictive film 9 of the present application is 15 to 20 years, the service life of the electrostrictive film is two to three times that of the liquid crystal television, and the problem of backlight control failure cannot be caused before liquid crystal damage occurs, and for the electrostrictive property of the nano polyether polyurethane material added with nano barium titanate, the electrostrictive property of polyurethane elastomer in the university report of southeast south of 5 months in 2005, the detailed description is given, and the reaction speed of the electrostrictive film 9 are expressed.
As explained further below with respect to the electrostrictive film 9 described above, it may deform or change shape in some manner when an electric field is applied to the electrical insulator. The characteristic of such an electrical insulator is called electrostriction. Specifically, electrostriction is the coupling between strain and an electric field, or between strain and polarization; the coupling is achieved by applying an electric field to the material only, when a voltage difference is applied to electrostriction, some material molecules are polarized, along the direction of the electric field, the positive pole of one molecule is connected with the negative pole of another molecule, the whole dielectric body contracts in this direction due to the attraction of the positive pole and the negative pole, until the internal elastic force is balanced with the electric attraction, which causes electrostriction of the material, the electrostriction material does not change the telescopic shape of the material like a magnetostrictive material, magnetostriction is linear in nature, the nonlinear characteristic of electrostriction allows the electrostriction material to show repeatable strain response to the electric field without hysteresis loss and waste heat generated thereby, compared with other electrostriction polymers, organic silicon polymers may show high strain performance, polymers with high strain performance are more suitable for environments where mechanical strain may be a problem than polymers with low strain performance, the electrostriction film 9 in the present application is made of a black colorant mixed with nano polyether polyurethane material with nano barium titanate added, and can generate more force under the same electric conditions as compared with other polymers, such polymers allow more input electric energy to be converted into mechanical strain, and when the electrostriction material is applied to precise electromechanical field, and the electrostriction material, usually has a high-speed, which is not applied to the electromechanical field.
Further, when the display screen optical data module 1 decodes the display input and does not change within a target time period, the first transparent electrode film 8 and the second transparent electrode film 10 enter a slow scanning mode, and power is saved, and meanwhile, because the electrostrictive film 9 has a hysteresis phenomenon of electrostriction, that is, the bending phenomenon of the electrostrictive film 9 under the action of an electric field shows a certain hysteresis, the phenomenon can be regarded as a memory function, after the external electric field is removed, the electrostrictive film 9 remembers the curvature of the electrostrictive film, and can be instantly restored when the external electric field is applied again later (the interval time does not exceed 30 s), in the process of using the display device, the scanning of the first transparent electrode film 8 and the second transparent electrode film 10 can enable the electrostrictive film 9 to quickly react, so that the time of deformation of the electrostrictive film 9 is greatly prolonged, so that the reaction time is not longer than the reaction time of switching of a full white and full black picture in the process of changing the display color by using a liquid crystal, which the reaction time is usually 12ms, and the reaction time of completely shielding the first transparent electrode film 9 and the second transparent electrode film 16 in the display device can not affect the trailing shadow display condition of dragging.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A display backlight control system for a display capable of monitoring a picture, comprising: the LED backlight module comprises a display screen light data module (1), an ambient light data acquisition module (2), a PID algorithm control module (3), an algorithm module (4), a backlight control system (5) and an LED backlight module (6), wherein the output ends of the display screen light data module (1) and the ambient light data acquisition module (2) are connected with the input end of the PID algorithm control module (3), the connecting end of the PID algorithm control module (3) is bidirectionally connected with the connecting end of the algorithm module (4), the output end of the PID algorithm control module (3) is connected with the input end of the backlight control system (5), the output end of the backlight control system (5) is connected with the input end of the LED backlight module (6), the ambient light data acquisition module (2) comprises a data processing module (21), a digital-to-analog conversion module (22) and a data input module (23), and the data input module (23) comprises a light intensity detection module (231) for acquiring light intensity data and a color detection module (232) for acquiring color data;
the LED backlight module (6) comprises a partition backlight driving module (61), a brightness adjusting driving module (62), a backlight partition module (63) and an LED backlight (64), wherein the output end of the partition backlight driving module (61) is connected with the input end of the backlight partition module (63), and the output end of the brightness adjusting driving module (62) is connected with the input end of the LED backlight (64);
backlight partition module (63) includes light guide plate (7), first transparent electrode membrane (8), electrostrictive film (9) and second transparent electrode membrane (10), the laminating of one side of the corresponding first transparent electrode membrane (8) of electrostrictive film (9) has the reflective membrane, the corresponding X direction of each photoetching department and two sets of parallel ITO sharp electrodes in Y direction in one side of corresponding electrostrictive film (9) of second transparent electrode membrane (10) and first transparent electrode membrane (8), and ITO sharp electrode point position is corresponding with display liquid crystal pixel, the one end fixedly connected with first reflector panel (11) of electrostrictive film (9) position is kept away from to second transparent electrode membrane (10), first reflector panel (11) is inside cavity and both ends are opening structure's backlight frame shape structure, LED (64) are including side income formula LED (13) in a poor light, and first reflector panel (11) both ends opening position and side income formula LED (13) fixed connection, the corresponding second transparent electrode membrane (10) position of first reflector panel (11) is the flute shape structure, and the corresponding corrugated inner wall (5) of inner wall of the corresponding second transparent electrode membrane (11) of inner wall (11) is the corresponding corrugated structure, the inner wall (10) of the corresponding second transparent electrode membrane (11) of second transparent electrode membrane (11) has the corresponding corrugated structure, the inner wall (11) of the inner wall position of second transparent electrode membrane (11) is the corresponding corrugated structure (10) and the inner wall position of second transparent electrode membrane (10) is coated First holes (15) are formed in the light guide plate, one end, corresponding to the position of the light guide plate (7), of each first hole (15) is of a flaring structure, the first holes (15) serve as light sources, the ITO linear electrodes at the positions of the first holes (15) are electrified, the electrostrictive films (9) at the positions react quickly to shrink towards the intersection points of the ITO linear electrodes and seal the first holes (15), so that the first holes (15) at the positions do not emit light or shield partial light rays, the light guide plate rapidly restores to the initial position when the power is off, and the first holes (15) are penetrated by light beams to achieve local control of the light sources.
2. The system of claim 1, wherein the backlight control system comprises: the output end of the data input module (23) is connected with the input end of the digital-to-analog conversion module (22), the output end of the digital-to-analog conversion module (22) is connected with the input end of the data processing module (21), and the data processing module (21) is used for processing data transmitted by the data input module (23), wherein the color data transmitted by the color detection module (232) is converted into color temperature data through calculation.
3. The system of claim 1, wherein the backlight control system comprises: the display screen optical data module (1) comprises a signal decoding module (101) for decoding an input signal of a display and a display signal module (102) for converting the data of the signal decoding module (101) into a display digital signal.
4. The system of claim 1, wherein the backlight control system comprises: the algorithm module (4) is a BP neural network algorithm based on a genetic algorithm, and the backlight control system (5) is used for driving the LED backlight module (6) to adjust backlight.
5. The system of claim 1, wherein the backlight control system comprises: the light guide plate (7), the first transparent electrode film (8), the electrostrictive film (9) and the second transparent electrode film (10) are sequentially and tightly attached to each other.
6. The system of claim 1, wherein the backlight control system comprises: one end fixedly connected with second reflector panel (12) of electrostrictive film (9) position is kept away from in second transparent electrode film (10), second reflector panel (12) are inside hollow frame shape structure, LED backlight (64) include miniLED banks (14), and miniLED banks (14) fixed connection keeps away from the one end inner wall of second transparent electrode film (10) position in second reflector panel (12), the inner wall of the corresponding second transparent electrode film (10) position of second reflector panel (12) is flute column structure, and the inclination of second reflector panel (12) inner wall flute column structure is 5, the inner wall coating of second reflector panel (12) has the reflecting paint, the second hole (16) has all been seted up at the middle part of ITO linear electrode crossing point position in the one end lateral wall of the corresponding second transparent electrode film (10) position of second reflector panel (12) and the corresponding second transparent electrode film (10) of electrostrictive film (9) and the corresponding second transparent electrode film (10) of reflective film, and the one end of the corresponding second transparent electrode film (7) position of second hole (16) is the flaring structure.
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| CN103354073B (en) * | 2013-06-13 | 2016-01-20 | 南京信息工程大学 | A kind of LCD color deviation correction method |
| CN104614801A (en) * | 2015-02-26 | 2015-05-13 | 苏州茂立光电科技有限公司 | Lateral-entrance backlight module and lateral-entrance light guide plate |
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| CN105405414A (en) * | 2016-01-06 | 2016-03-16 | 京东方科技集团股份有限公司 | Backlight and control method and display device thereof |
| CN105632413B (en) * | 2016-01-11 | 2018-09-11 | 京东方科技集团股份有限公司 | A kind of adjusting method of backlight, regulating device and display device |
| CN206573822U (en) * | 2017-03-16 | 2017-10-20 | 杭州仙果科技有限公司 | A kind of environment self-adaption formula LED backlight liquid crystal display |
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