TW201035939A - Backlight adjusting system and method - Google Patents

Abstract

The present invention provides a backlight adjusting system and a backlight adjusting method thereof. The backlight adjusting system comprises a first calculator, a processor, and a driver. The first calculator calculates a target display illumination value corresponding to a real ambient illumination value according to the real ambient illumination value, a best ambient illumination value, and a set display illumination value corresponding to the best ambient illumination value. The processor obtains an initial value of a target pulse duty value according to the target display illumination value. The driver generates a driving signal based on pulse width modulation according to the target pulse duty value.

Description

201035939, VI. Description of the Invention: [Technical Field] The present invention relates to an adjustment system and method, and more particularly to a backlight-adjustment system and method. [Prior Art] When a person views the face displayed by the display device, it is disturbed by ambient light. Due to the physiological characteristics of the human eye and the psychological feelings of the human being (the habit of long-term recognition of the brightness and chromaticity of the object), when the ambient brightness is relatively high, people will feel that the gray level of the picture is not smooth, and the face is not smooth. Whitening, and the color of the face appears, and when the shell is relatively low, the person will feel that the gray level of the face is not smooth, the low gray part of the picture is difficult to distinguish, and the high gray of the face The amount of change in the step portion is too large, and the color shift occurs on the surface. The liquid crystal display device adjusts the brightness of the backlight provided by the light-emitting element according to the ambient brightness by the backlight adjustment system to change the display brightness of the liquid crystal panel. Generally speaking, the brightness of the backlight is raised when the ambient brightness is relatively high, and the brightness of the backlight is lowered when the ambient brightness is relatively low, so that a person can see a relatively good quality. Referring to Fig. 1', a prior art backlight adjustment system 2 includes a brightness sensor 11, an analog to digital converter 12, a memory 13, a processor 14, and a driver 15. The brightness sensor 11 is used to sense the ambient brightness to generate an ambient brightness signal. Analog to digital converter 12 is electrically coupled to luminance sensor 11 for analog to digital conversion of the actual ambient luminance signal to produce an actual ambient luminance value. The memory 13 is used to store a lookup table including a plurality of ambient luminance values and a plurality of duty operating values respectively corresponding to the ambient luminance values. The processor 14 is electrically coupled to the analog to digital converter η and the memory 13 for finding a target pulse operating value from the lookup table based on the actual ambient brightness value. The driver 15 is electrically connected to the processor 14 for generating a driving signal in a pulse width modulation manner according to the eye pulse operating value, and outputting the driving signal to the light emitting element to adjust the backlight brightness. Although the backlight adjustment system 1 described above is capable of adjusting the brightness of the backlight to improve the quality of the kneading surface at a certain degree 3 201035939 degrees, the brightness of the adjusted backlight is not optimal, and there is still room for improvement in the surface quality. Moreover, since the illuminating element ages, the backlight shell is offset. If the backlight brightness provided by the illuminating element is adjusted according to the common look-up table, the backlight brightness cannot be adjusted to a better value as the illuminating element aging. The backlight brightness provided by different illuminating elements is inherently poor. 'If the backlight redundancy provided by different illuminating elements is adjusted according to the common look-up table', the backlight temperament cannot be adjusted to a better value. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a backlight adjustment system that can calculate a target display brightness associated with an optimum backlight brightness. Therefore, the backlight adjustment system of the present invention is adapted to adjust a backlight brightness provided by the two light-emitting elements according to an ambient brightness to change a display degree of a liquid crystal panel. The backlight adjustment system includes a first calculator, a processor, and a driver. The first calculator is configured to calculate a brightness value according to an actual ambient brightness value, an optimal ambient brightness, and a pair of settings that should be optimal ambient brightness values, and calculate a target display brightness value of a pair of actual ambient brightness values. The processor is electrically coupled to the first calculator for displaying a brightness value according to the target to obtain an initial value of a target pulse 1 value. The driver is electrically coupled to the processor for generating a drive signal in a pulse width modulation manner based on the target pulse operating value, and 0 for rotating the drive signal to the light emitting element. The Benben, Ming backlight adjustment system can calculate the target display brightness value related to the optimal backlight brightness by considering the actual ambient brightness value, the optimal environmental shell value and the set display brightness value. ~ μ While another object of the present invention is to provide a backlight adjustment method that can calculate a target display brightness associated with an optimum backlight brightness. Therefore, the backlight adjustment method of the present invention is adapted to adjust a backlight brightness provided by the two light-emitting elements according to an ambient brightness to change a display tolerance of a liquid crystal panel. The backlight adjustment method comprises the following steps: ' 显示 displaying a brightness value according to an actual ambient brightness value, an optimal ambient brightness value, and a pair of settings that should be the best ambient brightness value, and calculating a pair of actual ambient light 4 201035939 'degree value The target display brightness value; and (B) display the brightness value according to the target to obtain an initial value of the target pulse operation value associated with the backlight brightness provided by the light-emitting element. The backlight adjustment method of the present invention can calculate the target display luminance value associated with the optimal backlight luminance by considering the actual ambient luminance value, the optimal ambient luminance value, and the set display luminance value. A further object of the invention is to provide a backlight adjustment system capable of calculating a target display brightness associated with an optimum backlight brightness and adjusting the backlight brightness provided by the light-emitting element to an optimum backlight brightness without being illuminated. Component aging ^ Effect of differences in characteristics between light-emitting elements. Thus, the backlight adjustment system of the present invention is adapted to adjust a backlight brightness provided by a light-emitting element according to an ambient brightness to change a display brightness of a liquid crystal panel. The backlight adjustment system includes a first brightness sensor, a first analog to digital converter, a first calculator, a comparator, and a processor. The first brightness sensor is configured to sense the ambient brightness to generate an actual ambient brightness signal. The = analog to digital converter is electrically coupled to the first brightness sensor for analog to digital conversion of the actual ambient brightness signal to produce an actual ambient brightness value. The first calculator is electrically connected to the first analog to digital converter, and is configured to calculate a brightness value according to the actual ambient brightness value, an optimal ambient brightness value, and a pair of settings that should be optimally used. A pair of targets that should have actual ambient brightness values display the brightness value. The comparator is electrically coupled to the first calculator for comparing the target display brightness value with an actual display brightness value to produce a comparison result. The processor is electrically coupled to the comparator for adjusting a target pulse operating value associated with the brightness of the backlight provided by the light emitting element based on the comparison. The π-en, bright backlight adjustment method can calculate the target display brightness value related to the optimal backlight brightness by considering the actual ambient brightness value, the optimal environmental temperature value, and the set display brightness value. Comparing the target display brightness value and the actual display brightness to adjust the target pulse working value, the backlight degree can be adjusted to the optimal backlight brightness without being affected by the aging of the light emitting element and the characteristic difference between the light emitting elements. [Embodiment] The foregoing and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to FIG. 2, a preferred embodiment of the backlight adjustment system 2 of the present invention is adapted to adjust a backlight brightness provided by a light-emitting element (not shown) according to an ambient brightness to change a liquid crystal panel (not shown). Display brightness. The backlight adjustment system 2 of the present embodiment includes a first brightness sensor 20, a second brightness sensor 21, a first analog to digital converter 22, a second analog to digital converter 23, and a first calculation. The device 24, a second calculator 25, a comparator 26, a storage device 27, a processor 28 and a driver 29. The first brightness sensor 20 is for sensing ambient brightness to produce an actual ambient brightness signal. The first analog to digital converter 22 is electrically coupled to the first luminance sensor 20' for analog to digital conversion of the actual ambient luminance signal to produce an actual ambient luminance value. The first calculator 24 is electrically connected to the first analog to digital conversion descent 22' for setting the optimal ambient brightness value and a corresponding optimal ambient brightness value according to the actual J-freeness value, and received from the outside world. Display brightness value 'calculate a target display brightness value corresponding to the actual ambient brightness value, where the target display brightness value = actual ambient brightness value x set display brightness value / optimal environment 亮度 brightness value (the reason for this calculation will be later To explain). In this embodiment, the optimal ambient brightness value is the optimal ambient brightness generated by the sensing and analog-to-digital conversion, and the person is accustomed to performing comfortable visual viewing under the optimal ambient brightness, and the optimal ambient brightness is Change with the regional and ethnic factors; set the display brightness value under the optimal ambient brightness, when the LCD panel displays the best quality, the display brightness corresponding to the highest gray level is sensed and analogized to Generated by digital conversion. The brother-to-shell sensor 21 is used to sense the brightness of the backlight provided by the light-emitting element to generate a consistent light-shell signal. A second analog to digital converter is electrically coupled to the second luminance sensor 21' for analog to digital conversion of the actual backlight luminance signal to produce an actual backlight luminance value. The second calculator % electrical connection 6 201035939 receives a second analog to digital converter 23 for multiplying the actual backlight brightness value by a transmittance of the liquid crystal panel to produce an actual display brightness value. - In this embodiment, the second brightness sensor 21 may be disposed on the liquid crystal surface, or may be formed on the liquid crystal panel, the thin film transistor; the transmittance is Corresponding to the transmittance of the highest gray level, the actual display brightness value reflects the display brightness corresponding to the highest gray level. The comparator 26 is electrically connected to the first calculator 24 and the second calculator 25 for comparing the target display brightness value with the actual display brightness value to generate a comparison result storage device 27 It includes the pulse operation values of most display brightness values and most of the corresponding brightness values. The processor 28 is electrically connected to the first calculator 24, the comparator 26 and the storage 27 for displaying the brightness value according to the target, obtaining an initial value of the target pulse working value, and adjusting the target pulse working value according to the comparison result, The target display brightness value is greater than the actual display brightness value, and the second "pulse work value is increased, and when the target display brightness value is less than the actual display value, the target pulse work value is turned down. The driver 29 is electrically connected to the processor. 28, for generating a driving signal in a pulse width modulation manner according to the target pulse working value and applying to output the driving signal to the light emitting element to adjust the brightness of the backlight provided by the light emitting element. A brightness sensor 2, a first analog to a digital device, a first calculation 11 24 of these elements to sense ambient brightness, and calculate a target display brightness, and in addition to the second brightness sensor 21 The second analog-to-digital converter 23 and the second calculator 25 sense the brightness of the backlight provided by the light-emitting element, and calculate the display brightness of the liquid crystal panel, and then Comparing 26_, memory 27, processor 28 and driver 29 to compare the display brightness of the Z-shell and the liquid crystal panel, and adjust the backlight brightness of the light-emitting element to adjust the display brightness of the liquid crystal panel. The brightness is displayed to the target. It is noted that, in this embodiment, the second brightness sensor 21 is configured to measure the brightness of the backlight provided by the light emitting element to generate an actual backlight brightness signal; For example, the second brightness sensor 21 may be disposed on a surface of the liquid crystal panel that is remote from the light emitting element, for sensing the 7 201035939 display shell of the liquid crystal panel to generate an actual display brightness signal. The second calculator 25 can be omitted, and the second analog to digital converter 23 is electrically coupled to the comparator 26' for analog to digital conversion of the actual display luminance signal to produce an inter-display luminance value. 24 Reasons for calculation in the above manner. Referring to Figure 3, the change in ambient brightness causes gamma (gamm curve shift) that people feel. It is assumed that the corresponding gray scale display Degree and relative transmittance of eight and K, corresponding to the highest gray level (for example, the 256th gray level) display brightness ^ two 穿透 penetration rate is A% and 1 ', respectively, and the gamma curve gamma value is phase The rate is as follows: For tooth η 256

A

Bn< When the ambient brightness is exhausted, it is assumed that the display brightness corresponding to the "gray scale should be the highest grayscale display brightness of five 25, then the person feels the relative wear;:', as shown below: 咚竿1 Ο ^256y +^y ^256y (Βη λ B- 1 y D ^ ) }256y ^256y +^y

^256y +By At this time, the grayscale smoothness that people feel is as follows: 8 201035939

B- \-ίη+1] r~ y L U56 J

^2S6y + Β 256y n+V\ 256 + Β. 1° Β η

V 256y 256 +Β. Ο In the same way, when the optimal ambient brightness is watt, it is assumed that the display brightness corresponding to the gray level of the wth is 2, and the display brightness corresponding to the highest gray level is 5256z. The smoothness is as follows:

YnBy 6z «+ΐΛ ^56 + B, Β η ν 1° 256ζ 256 + β In order to prevent people from feeling the gray scale shift, the following formula must be satisfied Β 256^

n + lY 〇 256 + B,

B 256z n + 1) 256 + B. η \r f256y 256 ^^B^B25f>y-By B256z, ^ ' ^256y = By · B2S6z 256^

ByB 256z '2562 n 256 η y —1 256 + B. (Bz’B2S6y-

By B «+1Υ 256z> 256 Ring material off _ in accordance with the brightness of a /1 fixed glazing element - backlight brightness to change - liquid 9 201035939 crystal 'panel' - display brightness. In the embodiment f, the thinning method includes: Step 41: displaying the brightness value according to the setting of the actual ambient brightness value, an optimal ambient brightness value, and a corresponding optimal ambient brightness value, and calculating a pair, the degree value, and the display brightness value. , where 'target display brightness value = real ^ ring = party value X set display brightness value / optimal ambient brightness value. f) ^42 Τξ: An initial value of the target pulse operating value associated with the brightness of the backlight provided by the light-emitting element is obtained based on the brightness value of the lion. ^, tf 43 is the actual backlight brightness value obtained by multiplying the actual backlight brightness value by the liquid crystal panel. Ο Ο Step 44 is to compare the brightness of the target to the actual _ show bright, give a comparison result. 'Step 45 is to reduce the silk, and work hard. First, step 41~45 _ fine method can refer to the better example of the above county adjustment system, no more explanation here. According to the above description, by considering the parameters of the actual ambient brightness value, the optimal ringing redundancy value, and the set display brightness value, the above-mentioned embodiment can calculate the brightness of the target with the best backlight brightness and off, and borrow By comparing the target display brightness value and the actual display 7C degree to adjust the backlight brightness provided by the light-emitting element, the backlight can be adjusted to have a good back-filament degree, and * will be affected by the aging of the component and the characteristic difference between the hair piece, so The object of the invention is achieved. However, the above is only the preferred embodiment of the present invention. When it is not possible to limit the implementation of this (4), it is necessary to use the special fiber and the invention. The simple equivalent changes and modifications made in the description are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating a prior art backlight adjustment system; FIG. 2 is a block diagram illustrating a preferred embodiment of the backlight adjustment system of the present invention; 3 is a schematic diagram illustrating different ambient brightness A gamma curve perceived by a person; and FIG. 4 is a flow chart illustrating a preferred embodiment of the backlight adjustment method of the present invention. 201035939 • [Main component symbol description] 2 Backlight adjustment system 20 First brightness sensor 21 22 23 24 25 26 97 / Ο 28 Second brightness sensor First analog to digital converter Second analog to digital converter One calculator second calculator comparator processor memory 29 driver 41~45 step 〇11

Claims (1)

201035939 VII. Patent application scope: 1. A backlight adjustment system is adapted to adjust a backlight brightness provided by a light-emitting element according to an ambient brightness to change a display brightness of a liquid crystal panel, and the light adjustment system comprises: a first calculator, configured to display a brightness value according to an actual ambient brightness value, an optimal ambient brightness value, and a pair of settings that should be the optimal ambient brightness value, and calculate a target display brightness value that should be an actual ambient brightness value; a processor electrically connected to the first calculator for displaying a brightness value according to the target, obtaining an initial value of a target pulse working value; A driver electrically coupled to the processor for generating a drive signal in a pulse width modulation manner based on the target pulse operating value and for outputting the drive signal to the light emitting element. 2. The backlight adjustment system of claim 1, wherein the target display brightness value = the actual ambient brightness value X the set display brightness value / the optimal brightness value. 3. The backlight adjustment system of claim 1, further comprising: comparing, electrically, receiving the first calculator for comparing the target display brightness value with an actual display brightness value to generate a comparison result;) wherein the processor is further electrically coupled to the comparator for shaping the target pulse operating value based on the comparison. 4. The backlight adjustment system of claim 3, wherein the processor increases the target pulse value when the target display brightness value is greater than the actual display brightness value, When the target display brightness value is smaller than the actual display light, the target pulse operation value is turned down. 5. The backlight adjustment system of claim 3, further comprising: a second calculator electrically connected to the comparator for multiplying an actual backlight brightness value by a transmittance of the liquid crystal panel To produce the actual display brightness value. X. The backlight adjustment system of claim 5, further comprising: a second analog to digital converter electrically connected to the second calculator for analog to digital conversion of the actual backlight luminance signal, To produce the actual backlight bright 12 201035939 'degree value. 7. The backlight adjustment system of claim 6, further comprising: a second party sensor 'electrically connected to the second analog to digital converter for sensing the light emitting element The backlight brightness is provided to produce the actual backlight brightness signal. 8. The backlight adjustment system of claim 3, further comprising: a second analog to digital converter electrically coupled to the comparator for analog to digital conversion of an actual display luminance signal to This actual display brightness value is generated. 9. The backlight adjustment system of claim 8, further comprising: a second shell sensor electrically connected to the second analog to digital converter for sensing the liquid crystal panel The display brightness is generated to produce the actual display brightness signal. 10. For example. The backlight adjustment system of claim 1, further comprising: a first analog to digital converter electrically connected to the first calculator for analog-to-digital conversion of an actual ambient luminance signal to generate The actual environment is bright. 11. For example, please benefit the scope! . The backlight adjustment system further includes: a second degree-free detector, electrically connected to the first analog-to-digital converter, for U. The backlight adjustment system as described in the patent scope includes: The pulse line display system is like a recording machine, and the display is connected to the storage device, and the display is bright according to the target. The light adjustment method for adjusting the light-emitting element according to an ambient brightness includes changing the liquid crystal panel by ^step^ a display brightness, the back-best environment illumination and the best target; calculating a pair of actual ambient brightness values (8) according to the target display value, obtaining the trigger 13 provided by the light element 201035939 'An initial value of the light pulse related target pulse operating value. 14. The backlight adjustment method according to claim 13, wherein the target display shell value = the actual ambient brightness value X the set display brightness value / the optimal brightness value. x 15. The backlight adjustment method as described in the scope of the patent application, further includes the following steps: ^ (c) comparing the target display brightness value with an actual display brightness value to generate a comparison result, and (D) according to The comparison result adjusts the target pulse operating value.背光 16. The backlight adjustment method of claim 15, wherein in the step (D is when the target display brightness value is greater than the actual display brightness value, the working pulse is working side large) When the target display brightness value is small _ actual display light value ^ 'the target pulse operation value is reduced. 17. As described in claim 15 of the back-to-find method, the following steps are included. (miii retreat The lobes are used to obtain the backlight adjustment method according to the application of the patent _13, wherein the == standard display brightness value, to check the table to edit the target pulse work. Na___Environment 7 mentions the degree of change to the LCD surface _ light adjustment system includes: degree sensing ^ 'used to sense the brightness of the environment to produce - the actual environment converter, electrically connected to the first - brightness a sensor for analog to digital conversion by: ' to generate - actual ring connection _ first to analog to digital converter for gamma value, optimum ambient brightness value, and - pair Should be the best ring ^ bright 14 201035939. The value of the setting is obvious a brightness value, a pair of eye bar display brightness values that should be actual ambient brightness values; a comparator electrically coupled to the first calculator' for comparing the target display brightness value with an actual display brightness value to generate a comparison a result; and a processor 'electrically connected to the comparator' for adjusting a target pulse operating value associated with the backlight brightness provided by the light emitting element based on the comparison result. 20. As claimed in claim 19 The backlight adjustment system, wherein the target display brightness value=the actual ambient brightness value X is the set display brightness value/the optimal environment brightness value. < 21·The backlight adjustment as described in claim 19 The system further includes: a first metering device 'electrically connected to the comparator for multiplying an actual backlight brightness value by a transmittance of the liquid crystal panel to generate the actual display brightness value. The backlight adjustment system of claim 21, further comprising: a second analog to digital converter electrically connected to the second calculator for performing an actual backlight luminance signal The backlight adjustment system according to claim 22, further comprising: Ο a first redundancy sensor electrically connected to the second analogy a backlight converter for sensing the brightness of the backlight provided by the light-emitting element to generate the actual backlight brightness signal. The backlight adjustment system of claim 19, further comprising: a dead analog to digital converter electrically coupled to the comparator for analog to digital conversion of an actual display luminance signal to produce the actual display luminance value of two 25. As described in paragraph 24 of the benefit range The backlight adjustment system further includes: a further brightness sensor electrically connected to the second analog to digital converter for sensing the display brightness of the liquid crystal panel to generate the actual display brightness signal. 26. The backlight adjustment system of claim 19, further comprising: a driver electrically connected to the processor for generating a shaft signal according to the target pulse working value, the machine square wire, And applicable to the rotation of the drive 15 201035939 27. The backlight adjustment system described in claim 19 of the patent application, further includes: pi!! 2 majority display brightness value and most of the corresponding corresponding display 16