TWI337724B - - Google Patents

Description

9907 1 2 IX. Description of the invention: [Technical field to which the invention pertains] ▲ The present invention relates to an LCD brightness automatic adjustment system, which includes an image control unit, a bright line calculation and an output unit, and Wei Guang. An innovative designer of the side and brightness adaptive adjustment unit and the image gray scale extension unit. [Prior Art] Press, flat panel display is the trend of future display, and in the flat panel display type, lcd liquid screen is the most popular' because LCD has thin thickness, light weight, spread, power reduction, resolution south and Degree (four) points, making it fine from personal computers, commercial billboards to homes, etc., can be said to be the most widely used flat-panel display. The high-brightness characteristics of the LCD are quite suitable for commercial kanban. However, the high-brightness characteristic is a disadvantage when applied to a home theater. This is because the brightness of the LCD (four) optical module produces a 'transfer through the continent LCD. Change the transparency of the backlight, (4) The brightness of the mosquito (gray scale) 'When the image is presented with an 8-bit LCD, the gray level of the image is the brightest when the attack is light, and the brightness is the lowest when the gray level of the image is '. The brightness of the LCD τν is approximately between cd/m and _cd/m2 at the gray level 255, and between 〇5 cdW and i4 cd/m2 at the gray level 〇. The pupil of the human eye will be touched by the intensity of Weiguang around him, and the amount of light in Jingjin’s eyes will be reduced when the TV program presents a large area of high-gray images (such as snow). Entering the _ light 4 'When the TV program shows a minus _ night scene, the person's pupil will automatically enlarge to increase the amount of light turned by the person; in the actual viewing of the TV program, the light and dark of the image is constantly handed over (4), pupil It will also be continuously scaled as the image changes; therefore, the high-brightness characteristics of the lcd will continue to scale the scorpion _ load under the long W viewing, so it is easy to cause eye fatigue. As shown in Figures 1 and 2, the relationship between CRT TV and LCD TV (LCD TV) is related to the party's degree and party scale, which can be touched by its brightness value (10). The product of the luminous intensity expressed by the TV (the ghtness ratio) is the luminous flux emitted by the television. It can be seen from the figure that when the party's volatility rate is greater than a certain value, the luminous flux emitted by the CRTTV exhibits a near-constant steady state. The change of the image during the program will not cause excessive zooming of the pupil of the eye. The eye 1337724 9907 1 is less likely to be recorded; the image of the Wei LCD TV is __ 亮 亮 亮 亮 亮 亮 亮 亮 亮The rate is high, the fatigue of the eyes changes, the human eye _ puts money and changes the brightness of God, the temple road. Do not create the LCD TV curve in Figure 2, except that the long-term view of the program is too negative, [Bu, also "causes the feeling of poor image contrast, the reason is that the pupil does not have the time to adjust the zoom, if the program The frequency of light and dark changes is too high, and the human eye can immediately adjust the appropriate amount of light, which will result in a contrast of images;

Example: When driving at night, when the car is in contact with the opposite vehicle, the brightness of the headlights of the opposite vehicle will be automatically reduced, and the moment after the car will be dark if the front is dark, because the pupil is still = Small state 'The short-term will feel the line of sight is not good, must pass after a period of time to be properly sighted, because the pupil can not react immediately when the brightness changes drastically. In addition, the intensity of the ambient luminosity will also affect the comfort of watching the film, such as the shadow of the opera (four) (such as _), can reduce the brightness of the room _ silk to create a more realistic view of the atmosphere New fruit; at this time, because the indoor filament is reduced, the time hole will be followed by the release. At this time, if the brightness of the LCD TV is not properly low, the brightness of the screen is too large and the eye is doubled. The visual effect, the brightness of the TV face must obviously be adjusted appropriately with the change of ambient luminosity.

Therefore, in view of the problems in the use of the above-mentioned conventional LCD, how to develop an innovative design with more ideal practicability, the relevant industry needs to work hard to think about the goal and direction of the breakthrough. In view of the fact that this 'owner's shirt is engaged in the manufacturing and riding experience of the product, for the above-mentioned objectives, after detailed design and careful evaluation, the invention is finally practical. [Invention content] The main purpose of the invention is to provide an automatic adjustment system for 匕CD brightness, which is intended to solve the problem of long-term viewing due to the high brightness of the conventional (10). The problem of fatigue and poor image contrast is considered to be a breakthrough. The technical features of the problem solving of the present invention mainly include four main parts, wherein the first 6 1337724 9907 1 is a brightness adjustment unit; the second part is an image. Luminance expression rate calculation and output control ^疋, the second part is ambient light detection and brightness adaptability adjustment unit; the first part is the shadow data (; view _ turn design, L CD image information sequence After the four V's, after the rationale, the 输出 can output the image grayscale value to achieve the purpose of automatically controlling the TV^ flux, and can automatically control with the change of image content and ambient light.

The light transmission mx emitted by the LCD TV alleviates the long-term warfare caused by the program, and enhances the contrast and comfort of the image, so that the LCD can achieve better visual effects and more suitable for the needs of consumers. Another main purpose of the present invention is to provide a lining design of a coffee source core group at a predetermined place near the LCD. The LED vehicle includes red, green and blue color coffee, and can be distributed through the ring. The side and brightness suitable for the unit control the coffee light source module, so that when the ambient light color changes, the light source can be self-decreasing, and the film can enjoy the environment.丨玉......and [Implementation] In order to make your review and understanding of the purpose, characteristics and efficacy of the present invention more in-depth understanding and understanding, please cooperate with the [simplified description of the schema] as follows: 1* First, please refer to FIG. 3, Sun's invention LCD brightness automatic adjustment system. The preferred embodiment of the present invention is divided into four main parts, wherein the first part is, like brightness Adjustment unit (i 〇); the second part is image brightness rate calculation and output control unit 2 (2 0 ); the third part is ambient light detection and brightness adaptability adjustment unit (3 〇 ^ fourth The part is the image gray scale extension unit (4◦); the image signal of L c D passes through the four steps in sequence, and then the brightness of the output image can be adjusted to achieve automatic control of the LCDTV luminous flux. Purpose; ^ The company reveals the four main miscellaneous items. Shifang Qianming is as follows: 1. Image-free adjustment unit (1 〇): This unit can include a memory (^) and multiplication π(12) Composition, according to the ambient light and the content of the screen, the grayscale value adjustment of the output image The whole method is to temporarily store the entire image in the memory. After the image brightness table is not statistically completed and the brightness adjustment gain value (gT) is determined, the image is temporarily stored in the memory. In the picture, the red, green, and blue color gray levels are multiplied by the corresponding 7 99〇7 1 1 to adjust the gain value (gTC, gTG, gTB), and then the brightness of the entire image is adjusted. Like the grayscale value, the brightness of the image is calculated and the wheel control is used to calculate the brightness characteristics of the image, ', and the image data of this unit is only counted, so the circuit structure can be greatly simplified but the image signal is not used. The image signal is 8 bit data n. = The details of the wheel surface, such as the original 8 blt 'can save the hardware: the recording and output control unit (2 〇) can be composed of the following units: Table rate difference

a. Brightness conversion unit (21): The function of this unit is to convert the relationship between the brightness corresponding to the image, and the relationship between the white G and Β recorded by the general image signal and the Brahman is Gamma. For the curve of 0.45, it is necessary to carry out the Gamma 2·2 _ change of the image impurity, and the linear relationship between the object and the brightness, and the brightness of the image can be accurately calculated. b. pixel calculus calculation unit (2 2): This single Fu, which can be used to convert the luminance characteristics of the pixels into linear red, green and blue gray scale values (R, G 'converted silk γ, You can convert with the following simple formula:

Y=0.3R+0.59G+0.11B

Another embodiment of the meter is to use the uniform color space for brightness control. In 1976, CIE developed a perceptua丨uniformity color space LW, due to i;a*b · In the color space, people's perception of the brightness is equal, so the L*aY color space is used to control the brightness of the LCD TV, which is more in line with the human perception than the RGB color space. The calculation of the LYb·middle brightness L* can be obtained by the following formula: Υ=(〇·2126R+0.7152G+0.0722B)/255

_ 930.37; Κ< 0.008856

^ " I 11673-16; 0.008856 <7 Screen brightness statistics with L· instead of γ 8 1337724 99〇7 Picture brightness statistics unit (2 3 ): This unit calculates the sum of brightness of each picture = mage and brightness The expression rate BR; the total brightness of each point in the picture is summed up, the sum of the brightness of the picture is obtained, and then the sum of the brightness of the picture is divided by the sum of the maximum vanguard of the image Y_, which can be obtained. (4) Brightness representation rate (BR). For example, an 8-bit image with a total pixel size of N, the sum of the maximum A brightness Ytota丨 is:

Γί〇ιαι = 255N The brightness representation rate BR can be obtained by:

BR = X 2S5 = ^image

Y, 〇tal — N d, shell gain unit (2 4 ): the unit includes a brightness gain table, and the brightness gain rate is used to check the corresponding gain value, and the brightness gain table is an expected brightness Performance and brightness table turn _ the built-in brightness increase gY and bright wire transfer relationship table. e, Gain touch unit (2 5 ): This unit relies on the calculation and adjustment of the brightness increase rate. When the brightness of the image changes drastically, the brightness gain value of the brightness gain unit is also sharp. Change, at this time, the brightness gain value is directly output; when the brightness expression rate (BR) of the image is slowly or slightly changed, the brightness gain value also changes slightly. In this case, in order to avoid flickering of the picture, it is necessary. Smoothing the change of the brightness value can be implemented as follows: When the brightness gain value of the adjacent picture is less than a certain threshold Th, the output brightness value is the K-1 image before the image. After the output brightness gain value is averaged with the current brightness gain value, it is used as the brightness gain value of the current kneading output, that is,: 3, ambient light _ and brightness adaptability adjustment unit (3 Q ): the unit is paste The sensor price is just the change of ambient light. 'The ambient light changes through low-pass filtering (average processing) and then check the comparison table = UT), and determines the brightness adjustment gain value Ga of the ambient light; this ambient light sensing ί can be single 'Color or multi-color light sensor, if it is a multi-color light sensor, its gain value Gar, Gm ' 9 1337724 9907 can be adjusted appropriately with the change of ambient light color, for example, when the user watches the movie of the opera 'The indoor lighting should be changed from a fluorescent lamp with a color temperature of about 7000K to a tungsten lamp with a color temperature of 4000K. At this time, the gain value Gar>Gab can be obtained, so that the TV surface can obtain a lower color temperature, thereby creating a more compatible environment. The face of the atmosphere. 4. Gray-order number extension unit (40): The purpose of this unit is to avoid the phenomenon of False Contour due to the reduction of the gray level after the brightness gain gT operation; since most current monitors are The 8-bit design can only display 256 grayscales, and the use of the luminance gain gT will reduce the grayscale value of the image. If the grayscale of the image after the luminance gain operation is directly output, the result will be at the low grayscale. The number of gray levels is insufficient to produce a pseudo-contour phenomenon. This phenomenon is more obvious when the brightness gain value is smaller or lower, and the image of the problem is solved by the space error diffusion method (Spaciai Error Diffusion) or The Dithering technique of time enhances the image layering at low gray levels. The innovative system disclosed by the present invention can automatically control the luminous flux emitted by the LCD TV with the change of the image content of the LCD and the ambient light to reduce the excessive burden on the human eye caused by watching the program for a long time, and improve the contrast of the image. Comfort and better visual effects.

Another embodiment of the present invention, as shown in FIG. 4, is capable of placing an LED near the LCD TV.

=Source Module (5 〇) 'This light source module can be used by red, green and n three-color LEDs, and can be tuned to the ambient light illuminating brightness adjustment unit (3 Q) (4) This - (4) Light source module 〇) 'In this way, when the color of the ambient light changes, the color of the light source is automatically changed to create a better film euphoria environment. In another embodiment of the present invention, as shown in FIG. 5, the first partial image brightness adjustment sheet C = 1 (5) may be omitted, and the brightness data of the previous sheet may be used to perform the influence redundancy. Adjustment, this saves the cost of memory.友户 tThis is more into the "step" to the actual 1 杂 日 日 日 (4) to reveal the LCD brightness control system with the ^ rate to control the brightness of the LCD; as shown in Figure 6, its u is the actual measurement adjustment 1337724 9t〇7 Relationship between the rate of elimination and the LCD TV output-free value' L2 line is the relationship between the brightness ratio of the adjusted measurement and the LCD TV brightness output value. The L3 line is the adjusted LCD τν brightness. The expected value in relation to the presentation rate. Λ [Advantages of the invention]

1. The innovative "LCD brightness automatic adjustment system" disclosed in the present invention mainly combines image brightness adjusting unit (10), image brightness expression rate calculation and output control unit (2〇), ambient light detection and brightness adaptation. The fourth part, such as the adjustment unit (3 〇) and the image gray-scale extension unit (40), can automatically control the luminous flux emitted by the LCD TV according to the image content of the L CD and the change of the ambient light, thereby reducing The long-term viewing of the program creates an excessive burden on the human eye, and enhances the contrast and comfort of the image for better visual effects. 2. In addition, the present invention further comprises an innovative unique design of adding an LED light source module (5 〇) at a predetermined place near the LCD. The LED light ray group includes red, green and blue color coffee sets. Ambient light _ and brightness suitable for the ship to adjust the color control / coffee light source module 'by the time when the ambient light color machine can automatically change the color of the light source, to create a better film appreciation environment. In the present invention, the memory unit can be omitted in the luminance unit (丨Q), and the image brightness can be adjusted by using the front-reduction silk.

Recall the cost of the body. 1A The plain text of this & Ming's secret embodiment is specific to the technical features of the present invention. =: The person of this technology can change the singularity in the spirit and principle of this creation: Μ *more and modified It should be covered by the following paragraph 1337724 9907 1 as defined in the following patent application. [Simplified description of the drawings] Fig. 1 is a combined perspective view of the present invention. Fig. 2 is an exploded perspective view of the present invention. Figure 3 is a flow chart of a preferred embodiment of the present invention. Figure 4 is a flow chart of another preferred embodiment of the present invention. Figure 5 is a flow chart of still another preferred embodiment of the present invention. Figure 6 is a schematic diagram showing the results of controlling the brightness of the LCD of the present invention. [Description of main component symbols] Image brightness adjustment unit (10) Memory (11) Multiplication unit (12) Image brightness rate calculation and output control unit (2 0) Gray scale/luminance conversion unit (2 1) Picture brightness calculation Unit (2 2) (24) Surface brightness statistics unit (2 3) Brightness gain unit gain adjustment judgment unit (25) Ambient light detection and brightness adaptability adjustment unit (3 0 ) Image gray scale extension unit (40) LED light source module (50)

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Claims (1)

1337724 99Π7 1 X. Patent application scope: 1. An LCD brightness automatic adjustment system, comprising: an image brightness adjusting unit comprising a memory and a multiplication unit, and the gray scale value of the output image is obtained according to the ambient light and the screen content. Adjustment, the adjustment method is to temporarily store the entire image in the memory (FRAME BUFFER), and the entire image brightness expression rate is calculated and the brightness adjustment gain value is determined, and then temporarily stored in the memory. The entire image output is outputted by multiplying the red, green, and blue gray scales of the image by the corresponding brightness adjustment and increasing values, and the brightness of the entire image is adjusted by changing the gray scale value of the image; The image brightness adjusting unit may also adjust the image brightness by using the brightness data of the previous one for omitting the image of the memory unit; an image brightness rate calculation and output control unit is used to perform image brightness characteristics on the image data. Statistics and analysis, which include the following components: / a · Gray scale / brightness to fresh elements, the gray of borrowing money images is related to the brightness of its compliance The conversion of the system causes a linear relationship between the grayscale value and the brightness, and the brightness of the image is calculated by the method of b. b. The pixel brightness calculation unit: the red, green, and blue colors of the pixel towel are linear. The gray scale value is converted into brightness; c. the screen brightness statistical unit: to calculate the sum of the brightness of each picture and the brightness representation rate; to add up the brightness of each point in the picture, the sum of the brightness of the picture can be obtained. Then, the sum of the brightness of the face is divided by the sum of the maximum brightness of the image, that is, the brightness of the image is obtained by the $; the degree of gain unit includes: a brightness gain table, which uses the brightness rate to check the corresponding bean The value of the luminance gain table is a relationship between the brightness gain value and the brightness representation rate established by the relationship between the excitation brightness performance and the ^ table rate; e. the gain adjustment determination unit: by using the brightness gain value change rate Calculation and adjustment = When the brightness expression rate of the image changes drastically, the benefit value output by the brightness gain unit also changes accordingly. At this time, the brightness gain value is directly output; The reading table is transferred or slightly changed, and the brightness gain value also varies slightly with 13 1337724 9907 1; - Ambient light gamma and brightness adaptive adjustment unit: is a thin light _ device _ ambient light change 'will environment The change of light is checked by the Qianbo wave (average processing), and the contrast table is used to determine the brightness adjustment of the ambient light. This environment field can be used for the light sensing of the monochrome color, if it is a multi-color light sensor. The addition can be adjusted according to the change of the ambient light color; - the gray scale extension m' borrows (10) the image is subjected to the brightness gain operation, and the pseudo-contour phenomenon is generated due to the decrease of the gray scale number; the gray scale extension The unit can use the spatial error diffusion method (Spadai E Diffilsion) or the time perturbation method (melting technique to improve the image layering at low gray levels). According to the LCD brightness automatic adjustment system described in the scope of the patent application, the pixel brightness calculation unit of the image conversion calculation and output (4) unit can also use the (four) lang of perceptual uniformity for $degree. control. According to the LCD brightness automatic adjustment system described in the scope of the patent application, the gain adjustment judging unit can further smooth the change of the brightness gain value, which can be implemented as follows: when the brightness gain value of the adjacent surface is changed When the value is less than a certain value, the brightness gain value is ten times before the image is N _ is positive _ image output brightness increase: , after averaging with the current brightness gain value, as the current picture output brightness ^ benefit value . 4. An L CD brightness automatic adjustment system, comprising: - an image brightness adjustment unit, comprising: a dip and multiplication unit, which can adjust the gray scale value of the output image according to the ring light and the screen content, and the adjustment method is The whole = first stored in the memory (FRAMEBUFFER), after the whole _ image brightness rate is completed and the brightness adjustment gain value is determined, then the whole image temporarily stored in the memory is red, The green and blue color gray scales are multiplied by the brightness adjustment gain values corresponding to the respective states, and then output, and the brightness of the entire image is adjusted by changing the gray scale value of the image. The image brightness adjustment unit may also omit the memory. In the aspect of the unit, the brightness data of the image is adjusted to adjust the brightness of the image; ^ Then ~ - Image brightness table God calculation and input group, Gu_image# material image 14 1337724 9907 1 2 Statistics of temperature characteristics And analysis, which includes the following components: a. Grayscale/light-dark fresh elements, borrowing money, image gray, and system==r and brightness, a linear relationship, which can accurately calculate green and blue b. Pixel free calculation : By the color of the needle, the red and gray scale values are converted into brightness; c·degree is simple: to calculate the sum of brightness and brightness of each picture, and to increase the brightness of each point in the picture. Get up, you can get the brightness of this picture And, then divide the sum of the brightness of the face by the sum of the maximum brightness of the image, which can be obtained; | the brightness expression rate of the image; d. the brightness gain unit: including the brightness gain table, the brightness table Check the brightness gain value corresponding to the brightness gain table, which is a relationship between the brightness gain value and the brightness expression rate established by the relationship between the expected brightness performance and the brightness representation rate; e. Gain touch: the money The gain rate change rate is calculated and adjusted. When the brightness of the image changes sharply, the brightness gain value output by the brightness gain unit also changes. 'At this time, the brightness gain value is directly output; when the image ^ brightness The rate of presentation is slow and small, and the brightness is increased. An ambient light side and brightness adaptability adjustment unit: the system of light (8) 贞 环境 环境 环境 ' ' ' 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境 环境The environmental domain detector can be a single color or multi-color light sensor. If it is a multi-color light sensor, the gain value can be adjusted according to the change of the ambient light color; - Gray scale number extension element: storage The 敎f彡 image produces a pseudo-contour phenomenon after the luminance gain operation is reduced; the gray-order number extension unit can utilize the spatial error diffusion method (Spacial Error Diffusion) or the time perturbation method (Dithering) technology. To enhance the image layering of the low gray level; a led light source module is added to the predetermined place near the L c D, the lED light source module comprises red, green and blue LEDs, and can pass through the ambient light The detection and brightness adaptability adjusting unit controls the LED light source module, so that the color of the light source can be automatically changed when the ambient light color changes. 15 1337724 99〇7 5. The LCD brightness automatic adjustment system according to item 4 of the patent application scope. The image brightness representation rate calculation and the pixel brightness calculation unit of the output control unit can also be used for the perceptual uniformity color space. Perform brightness control. 6. According to the fourth aspect of the patent application scope, the brightness of the LCD is automatically adjusted, and the gain adjustment judging unit can further smooth the change of the brightness gain value, and the basin can be as follows: implementation: when approaching the surface The brightness gain value change rate is less than a certain threshold value ^, and the output intensity gain value is obtained by averaging the current brightness gain value of the brightness information outputted by the image of the first N pictures (N is a positive integer; The current LCD output automatic brightness adjustment system includes an image brightness adjustment unit, the image brightness adjustment unit comprises a memory and a multiplication unit, and the output image is output according to the ambient light and the picture content. The adjustment of the grayscale value is performed by temporarily storing the image in the memory. After the image brightness representation rate is completed and the brightness adjustment gain value is determined, the image temporarily stored in the memory is output to the image. The red, green, and blue color gray scales are multiplied by the brightness adjustment gain values corresponding to the respective colors, and then outputted, thereby changing the image gray scale value to perform image brightness. Adjustment. 16