CN103578435A - Backlight adjusting method and electronic device with backlight adjusting function - Google Patents

Abstract

The invention provides a backlight adjusting method. The method includes the first step of responding to an adjusting signal including backlight adjusting parameters and controlling and adjusting the brightness of backlight according to the backlight adjusting parameters, the second step of adjusting the brightness of a YUV image signal in a YUV mode according to the brightness adjusting parameters when the brightness of the backlight is adjusted, the third step of converting the YUV image signal in the YUV mode to an RGB image signal in an RGB mode according to the adjusted brightness value, and the fourth step of outputting and displaying the RGB image signal obtained through conversion. Through the method, the brightness of the backlight is lowered while the brightness of the YUV image signal is adjusted. Consequently, the corresponding RGB image signal is correspondingly adjusted, and image color distortion and image display quality caused by the brightness reduction of the backlight are compensated and improved. The invention further provides an electronic device with the backlight adjusting function.

Description

Backlight adjustment method and electronic device with the backlight adjustment function

technical field

The invention relates to a backlight adjustment method, in particular to a backlight adjustment method without reducing image display quality and an electronic device with the backlight adjustment function.

Background technique

Most of the display screens of present TV sets, computer monitors, mobile phones and other multimedia playback devices are liquid crystal display screens. The liquid crystal display adopts a backlight structure. Usually, in order to save the power consumption of the liquid crystal display, a backlight brightness adjustment function is designed on the backlight module. Users can adjust the backlight brightness according to their own needs. However, there is still a problem in this backlight brightness adjustment method. For different input images, random increase or decrease of the backlight brightness will affect the output image quality. In general, when the brightness of the backlight is reduced, the image display quality is also reduced.

Contents of the invention

In view of this, the present invention provides a backlight adjustment method without reducing image display quality and an electronic device with the backlight adjustment function.

An electronic device comprising:

a display unit for displaying image information, the display unit includes a liquid crystal display module and a backlight module; and,

Master control unit, including:

The backlight control module is used to respond to an adjustment signal including a backlight adjustment parameter, and control and adjust the backlight brightness of the backlight module according to the backlight adjustment parameter;

The brightness adjustment module is used to adjust the brightness of the YUV image signal color-coded using the YUV signal according to a brightness adjustment parameter when the backlight control module controls to lower the backlight brightness of the backlight module;

A conversion module for converting the YUV image signal color-coded by the YUV signal into an RGB image signal color-coded by the RGB signal using the adjusted brightness value; and,

The image output module is used to send the RGB image signal converted by the conversion module to the liquid crystal display module, and control the liquid crystal display module to display the RGB image signal.

A backlight adjustment method, comprising the steps of:

a. In response to an adjustment signal including backlight adjustment parameters, control and adjust the brightness of the backlight according to the backlight adjustment parameters;

b. When the brightness of the backlight is adjusted, adjust the brightness of the YUV image signal in the YUV color coding mode according to the brightness adjustment parameter;

c. Use the adjusted brightness value to convert the YUV image signal using the YUV color encoding method into an RGB image signal using the RGB color encoding method;

d. Output and display the converted RGB image signal.

Adjust the brightness value of the YUV image signal while reducing the brightness of the backlight, so that when the YUV image signal is converted into an RGB image signal using the adjusted brightness value Y _new , the RGB image signal is also adjusted accordingly, compensating and improving the brightness due to the backlight The color distortion of the image caused by the decrease in brightness and the degradation of image display quality.

Description of drawings

FIG. 1 is a schematic diagram of a module structure of an electronic device with a backlight adjustment function according to an embodiment of the present invention.

FIG. 2 is a flowchart of a method for adjusting the backlight of the electronic device in FIG. 1 .

Description of main component symbols

electronic device 100 input unit 10 storage unit 20 master control unit 30 Backlight Control Module 31 Brightness Adjustment Module 32 conversion module 33 Image output module 34 Display unit 40 LCD module 41 Backlight module 42 ambient light detection unit 50

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

Please refer to Figure 1. It is a schematic diagram of a module structure of an electronic device 100 with a backlight adjustment function in an embodiment of the present invention. The electronic device 100 includes a main control unit 30 and a display unit 40 . The display unit 40 includes a liquid crystal display module 41 and a backlight module 42 .

In this embodiment, the main control unit 30 includes a backlight control module 31 , a brightness adjustment module 32 , a conversion module 33 and an image output module 34 .

The backlight control module 31 is used for controlling and adjusting the brightness of the backlight of the backlight module 42 in response to an adjustment signal. Specifically, the backlight control module 31 adjusts the brightness of the backlight of the backlight module 42 according to a backlight adjustment parameter α in response to an adjustment signal. Wherein, the backlight adjustment parameter α is a percentage of the maximum brightness of the backlight module 42 . Suppose the maximum brightness of the backlight module 42 is 100%. If the backlight adjustment parameter α=0.5, the backlight control module 31 controls the brightness of the backlight of the backlight module 42 to be adjusted to 50% of the maximum brightness. If the backlight adjustment parameter α=0.6, Then the backlight control module 31 controls the brightness of the backlight of the backlight module 42 to adjust to 60% of the maximum brightness. Wherein, the adjustment signal may be generated by the user operating a control button (not shown in the figure) on the electronic device 100 , or may be generated by the user touching a touch screen unit attached to the display unit 40 .

The brightness adjustment module 32 is used to adjust the brightness of the YUV image signal using the YUV color coding method when the backlight control module 31 controls and adjusts the backlight brightness of the backlight module 42 . In the current image signal transmission, common compression formats MPEG, JPEG, common video formats and TV signals often use YUV color coding to describe digital image signals. In the YUV color coding method, Y represents brightness (Luminance, Luma), and U and V represent chroma (Chrominance) and concentration (Chroma) respectively. In this embodiment, the brightness adjustment module 32 extracts the brightness value Y of each pixel from the YUV image signal, and then adjusts the brightness of the YUV image signal according to a brightness adjustment parameter β. The brightness value of a certain pixel point is Y, and the brightness adjustment parameter β, then the brightness adjustment module 32 adjusts the brightness value of the pixel point to Y _new =β*Y. If the β value is greater than 1, the adjusted brightness value Y _new is higher than the original brightness value Y; if the β value is less than 1, the corresponding brightness value Y _new is lower than the original brightness value Y.

The conversion module 33 is used for converting the YUV image signal into an RGB image signal using an RGB color coding method by using the adjusted brightness value Y _new according to a conversion formula. The interconversion between RGB signals and YUV signals is an existing mature technology, which will not be repeated here. The specific conversion formula for converting YUV signal to RGB signal is:

R=Y _new +1.13983*V;

G= _Ynew -0.39465*U-0.58060*V;

B=Y _new +2.03211*U.

The image output module 34 is used to send the RGB image signal converted by the conversion module 33 to the liquid crystal display module 41 . The liquid crystal display module 41 recognizes the RGB image signal, and controls the liquid crystal molecules in the liquid crystal display module 41 to rotate by a corresponding deflection angle, thereby displaying a corresponding image.

In this embodiment, the brightness adjustment module 32 stores a correspondence table between the backlight adjustment parameter α and the brightness adjustment parameter β. When the backlight control module 31 responds to the adjustment signal and adjusts the backlight module 42 according to the backlight adjustment parameter When the brightness of the backlight is set, the brightness adjustment module 32 reads the brightness adjustment parameter β corresponding to the backlight adjustment parameter α from the correspondence table between the backlight adjustment parameter α and the brightness adjustment parameter β. Wherein, the RGB image adjusted by the brightness adjustment parameter β corresponding to the backlight adjustment parameter α is adapted to the backlight brightness of the backlight module 42 adjusted by the backlight adjustment parameter α. That is, after the backlight control module 31 adjusts the backlight brightness of the backlight module 42 according to the backlight adjustment parameter α, the display quality of the RGB image adjusted by the brightness adjustment parameter β corresponding to the backlight adjustment parameter α will not decrease.

The present invention adjusts the brightness value of the YUV image signal while reducing the brightness of the backlight, so that when the YUV image signal is converted into an RGB image signal using the adjusted brightness value Y _new , the brightness value of the RGB image signal is also adjusted accordingly, Compensates and improves image color distortion and image display quality degradation caused by backlight brightness drop.

In other embodiments, the electronic device 100 further includes an input unit 10 and a storage unit 20 , through which the user can input an adjustment signal including a backlight adjustment parameter α and a brightness adjustment parameter β. The backlight control module 31 responds to the adjustment signal, and controls the brightness of the backlight of the backlight module 42 according to the backlight adjustment parameter α; the brightness adjustment module 32 responds to the user's input, and adjusts the color-coded image using the YUV signal according to the brightness adjustment parameter β The brightness of the signal.

In other implementations, the electronic device 100 further includes an ambient light detection unit 50 , and the storage unit 20 stores a correspondence table between a backlight adjustment parameter α and an ambient light intensity. When the ambient light detection unit detects that the current ambient light intensity changes, determine the current ambient light intensity and determine the backlight adjustment parameter α corresponding to the current ambient light intensity according to the correspondence table between the backlight adjustment parameter α and the ambient light intensity, and An adjustment signal including the backlight adjustment parameter α is generated, and the backlight control module 31 controls the brightness of the backlight of the backlight module 42 according to the backlight adjustment parameter α after receiving the adjustment signal.

Please refer to FIG. 2 , which is a flow chart of the method for adjusting the backlight of the electronic device 100 in the first embodiment of the present invention, including the following steps:

Step S1 , the backlight control module 31 responds to an adjustment signal including the backlight adjustment parameter α, and controls and adjusts the brightness of the backlight of the backlight module 42 according to the backlight adjustment parameter α. In this embodiment, the input unit 10 of the electronic device 100 generates an adjustment signal including the backlight adjustment parameter α in response to the user's input. In another embodiment, when the ambient light detection unit detects that the current ambient light intensity changes, it determines the current ambient light intensity and determines the correspondence between the current ambient light intensity according to the correspondence table between the backlight adjustment parameter α and the ambient light intensity. The backlight adjustment parameter α, and an adjustment signal including the backlight adjustment parameter α is generated.

Step S2 , the brightness adjustment module 32 adjusts the brightness of the YUV image signal in the YUV color coding mode according to the brightness adjustment parameter β when the backlight control module 31 controls and adjusts the brightness of the backlight of the backlight module 42 . The specific brightness adjustment module 32 extracts the brightness value Y of each pixel from the YUV image signal, and then adjusts the brightness of the YUV image signal according to a brightness adjustment parameter β, and the adjusted brightness value becomes Y _new = β*Y. Wherein, in this embodiment, the brightness adjustment module 32 stores a correspondence table of the backlight adjustment parameter α and the brightness adjustment parameter β, when the backlight control module 31 adjusts the brightness of the backlight of the backlight module 42 according to the backlight adjustment parameter α , the brightness adjustment module 32 reads the brightness adjustment parameter β corresponding to the backlight adjustment parameter α from the correspondence table of the backlight adjustment parameter α and the brightness adjustment parameter β. In another embodiment, the user can input an adjustment signal including the backlight adjustment parameter α and the brightness adjustment parameter β through the input unit 10 .

In step S3, the conversion module 33 uses the adjusted brightness value Y _new to convert the YUV image signal that is color-coded in the YUV method into an RGB image signal that is color-coded in the RGB method.

Step S4 , the image output module 34 sends the RGB image signal converted by the conversion module 33 to the display unit 40 .

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Alterations and variations are within the scope of the claimed invention.

Claims (9)

1. an electronic installation, this device comprises:

Display unit, for displays image information, this display unit comprises liquid crystal display module and backlight module; And,

Main control unit, comprising:

Backlight control module, for responding a conditioning signal that comprises adjustment parameter backlight, controls according to this adjustment parameter backlight the backlight illumination of adjusting backlight module;

Lightness adjusting module, while turning down the backlight illumination of backlight module for controlling at backlight control module, adjusts parameter adjustment according to a lightness and uses YUV signal to carry out the lightness of color-coded YUV picture signal;

Modular converter, is converted to and uses rgb signal to carry out color-coded RGB picture signal for using brightness-value after adjustment that YUV signal is carried out to color-coded YUV picture signal; And,

Image output module, for the RGB picture signal obtaining through modular converter conversion is sent to liquid crystal display module, controls this liquid crystal display module and shows described RGB picture signal.

2. electronic installation as claimed in claim 1, it is characterized in that: lightness adjusting module extracts the brightness-value Y of each pixel from YUV signal, according to lightness, adjust the lightness that parameter beta is adjusted picture signal, after adjustment, the brightness-value of this pixel is Y _new=β * Y.

3. electronic installation as claimed in claim 1, it is characterized in that: electronic installation also comprises an input block, this input block receives the conditioning signal that comprises adjustment parameter backlight and the lightness of user's input and adjusts parameter, backlight control module response user's input, controls the brightness backlight of backlight module according to the adjustment parameter backlight of user's input; Lightness adjusting module response user's input, adjusts parameter adjustment according to the lightness of user's input and uses YUV signal to carry out the lightness of color-coded picture signal.

4. electronic installation as claimed in claim 1, it is characterized in that: lightness adjusting module also stores the mapping table of an adjustment parameter backlight and lightness adjustment parameter, lightness adjusting module reads the lightness corresponding with adjustment parameter backlight and adjusts parameter from the mapping table of this adjustment parameter backlight and lightness adjustment parameter, and according to this lightness, adjusts parameter adjustment and use YUV signal to carry out the lightness of color-coded picture signal.

5. a backlight adjusting method, is characterized in that, comprises the steps:

A. respond a conditioning signal that comprises adjustment parameter backlight, according to adjustment parameter regulating and controlling backlight brightness backlight;

B. when backlight illumination is conditioned, according to lightness, adjust the lightness of the YUV picture signal of parameter adjustment YUV color coding mode;

C. use the brightness-value after adjusting to use the YUV picture signal of YUV color coding mode to be converted to the RGB picture signal of using RGB color coding mode;

D. will carry out output display through the RGB picture signal being converted to.

6. backlight adjusting method as claimed in claim 5, is characterized in that: described step a " responds a conditioning signal that comprises adjustment parameter backlight, according to adjustment parameter regulating and controlling backlight brightness backlight " and comprising:

The conditioning signal that comprises adjustment parameter backlight that response user inputs by input block, and according to adjustment parameter regulating and controlling backlight brightness backlight.

7. backlight adjusting method as claimed in claim 5, is characterized in that: described step a " responds a conditioning signal that comprises adjustment parameter backlight, according to adjustment parameter regulating and controlling backlight brightness backlight " and comprising:

When detecting current environment light intensity changes, determine current ambient light intensity;

According to adjustment parameter backlight and the mapping table of ambient light intensity, determine the adjustment parameter backlight that this current ambient light intensity is corresponding;

Generation comprises the conditioning signal of this adjustment parameter backlight, and according to adjustment parameter regulating and controlling backlight brightness backlight.

8. backlight adjusting method as claimed in claim 5, is characterized in that: described step b " when backlight illumination is turned down, adjusts parameter adjustment YUV signal according to lightness and carries out the lightness of color-coded YUV picture signal " and comprising:

When backlight illumination is turned down, the lightness of response user input is adjusted parameter adjustment YUV mode and is carried out the lightness of color-coded YUV picture signal.

9. backlight adjusting method as claimed in claim 5, is characterized in that: described step b " when backlight illumination is turned down, adjusts parameter adjustment YUV signal according to lightness and carries out the lightness of color-coded YUV picture signal " and comprising:

When backlight illumination is turned down, from the mapping table of adjustment parameter backlight and lightness adjustment parameter, read the lightness corresponding with adjustment parameter backlight and adjust parameter;

According to lightness, adjust parameter adjustment YUV signal and carry out the lightness of color-coded YUV picture signal.