CN1661663A - Set and method for adjusting brightness and contrast - Google Patents

Abstract

A brightness and contrast adjustment device and method, the brightness and contrast adjustment device includes: a button, a single-chip microcomputer, a digital-to-analog converter, a signal amplifier, a backlight controller, a display screen and a power supply. The brightness and contrast adjustment method includes the following steps: accepting user input of a comprehensive brightness; obtaining the comprehensive brightness and displaying it on the display screen; calculating a brightness and a contrast value from the comprehensive brightness; converting the brightness and contrast values It is a voltage pulse signal of brightness and contrast; adjusts the voltage pulse signal of brightness and contrast; and displays the image effect of adjusted brightness and contrast. By implementing the present invention, the user only needs to input a comprehensive brightness to achieve the image display effect of simultaneously adjusting brightness and contrast.

Description

Brightness and contrast adjustment device and method

【Technical field】

The present invention relates to a technology for adjusting brightness and contrast in a display device, in particular to a device and method for adjusting brightness and contrast in a single operation in a display device.

【Prior Technology】

Display, as an important image output device, is gradually developing to a higher technology. The current display types mainly include CRT (Cathode-ray Tube) display, liquid crystal display (LCD) and plasma display (PDP). The display function of the display is mainly completed by a backlight light source, and the brightness of the light source determines the display brightness (Brightness) of the display; contrast (Contrast) refers to the contrast measurement of different levels of black and white colors. Theoretically speaking, the higher the brightness of the display, the better. When the contrast ratio reaches 120:1, vivid and rich image colors can be displayed. Therefore, the brightness and contrast adjustment functions of the display greatly affect the image display effect. The current general display device adopts the method of adjusting the brightness and contrast alternately, but there are also some products which are completed by a single operation knob. For example, the brightness and contrast adjustment of TDS-7xxD series oscilloscopes is controlled by a knob, which needs to be adjusted by selecting the brightness and contrast adjustment function on the main menu, which is actually equivalent to using two knobs to adjust the brightness And contrast, one of the knobs is used to adjust the brightness, and the other is used to adjust the contrast, but it does not really achieve the function of adjusting brightness and contrast at the same time with a single operation method.

The technology for adjusting the brightness and contrast of the display device was disclosed in U.S. Patent No. 6,239,782, which was announced on March 29, 2001. In Digital Test and Measurement Equipment)". This patent discloses a device and method for simultaneously adjusting brightness and contrast through a single knob in test and measurement equipment. The method uses a series of curves composed of multiple pixel values used to describe the brightness to display the control byte. The operation method of controlling brightness with a single knob is to complete the adjustment function of brightness and contrast by selecting a special curve. However, the disadvantage of this invention is that the pixel values used to describe the brightness and contrast curves need to be pre-stored in the memory, and the brightness control value read from the user's single knob needs to be compared with multiple pixel values of the curve, thereby increasing the Hardware burden, and more complex to implement.

In order to overcome the deficiencies of the above-mentioned prior art, it is necessary to provide a brightness and contrast adjustment device and method, which only adds an integrated brightness to the display device to obtain the brightness and contrast values at the same time, and the user can easily adjust the brightness and contrast at the same time with a single operation. The brightness and contrast of the image display.

【Content of invention】

Aiming at the deficiencies of the prior art, the main purpose of the present invention is to provide a brightness and contrast adjustment device and method, which can be applied to a display device to adjust the brightness and contrast of image display in a single operation.

Another object of the present invention is to provide a brightness and contrast adjustment device and method. When the user inputs a comprehensive brightness of 0% to 50%, the range of brightness adjustment is 0% to 20% and the range of contrast adjustment is 0% % to 80%; when the user inputs a comprehensive brightness of 50% to 100%, the range of adjusting brightness is 20% to 100% and the range of adjusting contrast is 80% to 100%.

In order to achieve the purpose of the above invention, the present invention provides a brightness and contrast adjustment device. The brightness and contrast adjustment device includes: a button for accepting the value of a comprehensive brightness (Luminance) input by the user, and the described composite brightness refers to the final brightness displayed on the screen of the display device required by the user. key and right button; a single-chip microcomputer is used to obtain the value of the integrated brightness input from the key, and calculates a value of brightness and a contrast from the integrated brightness; a digital-to-analog converter is used for calculating the brightness and The value of the contrast is converted into a voltage pulse signal of brightness and contrast; a signal amplifier is used to scale and adjust the amplitude width of the voltage pulse signal of brightness and contrast converted from the digital-to-analog converter, and a low voltage differential signal ( Low Voltage Differential Signaling, LVDS) transmission mode output voltage pulse signal of brightness and contrast; a backlight controller is used to receive the low voltage differential signal of the brightness and contrast, and control the image display of the low voltage differential signal of the brightness and contrast; a display The screen is used to display the image display effect of the adjusted brightness and contrast; and a power supply is used to provide the required current and voltage to the brightness and contrast adjustment device. Wherein, the single-chip microcomputer includes: an integrated brightness acquisition module for obtaining the value of the integrated brightness input from the key; a brightness calculation module for calculating a brightness value from the integrated brightness value; and a contrast calculation module A value for calculating a contrast ratio from the value of the integrated brightness;

The invention also provides a brightness and contrast adjustment method. The method for adjusting brightness and contrast includes: accepting user input of an integrated brightness; obtaining said integrated brightness and displaying it on a display screen; calculating a value of brightness and a contrast from said integrated brightness; combining said brightness and The numerical value of the contrast is converted into a voltage pulse signal of brightness and contrast; the voltage pulse signal of adjusting the brightness and contrast; and an image display effect of the adjusted brightness and contrast are displayed.

Through the implementation of the present invention, the user only needs to input a comprehensive brightness in a single operation mode in the display device to achieve the image display effect of adjusting the brightness and contrast at the same time.

【Description of drawings】

FIG. 1 is a hardware block diagram of the brightness and contrast adjustment device of the present invention.

Fig. 2 is a function line diagram of calculating brightness and contrast from integrated brightness in the brightness and contrast adjustment method of the present invention.

FIG. 3 is a flow chart of the brightness and contrast adjustment method of the present invention.

【Detailed ways】

As shown in FIG. 1 , it is a hardware block diagram of the brightness and contrast adjustment device of the present invention. The brightness and contrast adjustment device includes a key (Key) 1, a single-chip microcomputer (MICON) 2, a digital-to-analog converter (A/D Inverter) 3, a signal amplifier (Signal Scalar) 4, a backlight controller (Back Light Controller) 5, a display screen (Display Screen) 6 and a power supply (Power) 7. Among them, the key 1 is used to accept the user to input a numerical value of integrated brightness, the key 1 is composed of a left key 11 and a right key 12, the left key 11 is used to accept the user to input a value for reducing the integrated brightness, and the right key 12 is used to accept user input A value that increases the overall brightness. The single-chip microcomputer 2 is used to obtain the integrated brightness value input from the key 1, and calculate a brightness and a contrast value from the integrated brightness. The single-chip microcomputer 2 includes a comprehensive brightness acquisition module 21 , a brightness calculation module 22 and a contrast calculation module 23 . The integrated brightness acquisition module 21 is used to obtain the value of an integrated brightness input from the button 1; the brightness calculation module 22 is used to calculate a brightness value from the integrated brightness; and the contrast calculation module is used to obtain the integrated brightness value from the integrated brightness. Calculate the value of a contrast ratio. The digital-to-analog converter 3 is used to convert the brightness and contrast values calculated by the single-chip microcomputer 2 into voltage pulse signals of brightness and contrast. The signal amplifier 4 includes a pulse width modulation module (Pulse Width-adjustModule, PWM) 41, which is used to scale and adjust the amplitude width of the voltage pulse signal of the brightness and contrast converted from the digital-to-analog converter 3, and use a low-voltage differential The transmission mode of the signal (LVDS) outputs voltage pulse signals of brightness and contrast to the backlight controller 5 . The backlight controller 5 is used for receiving the low voltage differential signal of brightness and contrast, and controlling the image display of the low voltage differential signal of brightness and contrast. The display screen 6 is used to display the image display effect with adjusted brightness and contrast. The power supply 7 is used to provide the required current and voltage to the brightness and contrast adjustment device.

As shown in FIG. 2 , it is a function line graph of calculating brightness and contrast from integrated brightness in the brightness and contrast adjustment method of the present invention. The luminance broken line 201 of the function line graph represents the functional relationship of the luminance obtained from the integrated luminance, its abscissa represents the value of the integrated luminance, and its ordinate represents the value of the luminance. After the comprehensive brightness acquisition module 21 of the single-chip microcomputer 2 obtains a comprehensive brightness, the brightness calculation module 22 calculates the brightness value from the comprehensive brightness. The method of calculating the brightness from the integrated brightness is: when the integrated brightness is less than or equal to 50%, then the brightness = (integrated brightness × 2.sup.1)/5; when the integrated brightness is greater than 50%, then the brightness = 20 +((Comprehensive Brightness-50)×2.sup.3)/5. where ".sup." is the exponentiation operator. The contrast broken line 202 of the function line graph represents the functional relationship of the contrast obtained from the integrated brightness, its abscissa represents the value of the integrated brightness, and its ordinate represents the value of the contrast. After the integrated brightness acquisition module 21 of the single chip microcomputer 2 acquires the integrated brightness, the contrast calculation module 23 calculates the contrast value from the integrated brightness. The method of calculating the contrast from the integrated brightness is: when the integrated brightness is less than or equal to 50%, then the contrast = (integrated brightness × 2.sup.3)/5; when the integrated brightness is greater than 50%, then the contrast = 80 +((integrated brightness-50)×2.sup.1)/5.

From the broken line 201 and the broken line 202 of Fig. 2, it can be seen that when the value of the integrated brightness obtained from the integrated brightness acquisition module 21 is 0% to 50%, the brightness calculated by the brightness calculation module 22 is 0% to 20% and the contrast ratio The contrast calculated by the calculation module 23 is 0% to 80%; when the value obtained from the comprehensive brightness acquisition module 21 is 50% to 100%, the brightness calculated by the brightness calculation module 22 is 20% to 100%. And the contrast calculated by the contrast calculation module 23 is 80% to 100%. The pseudo-codes (Pseudo-codes) for calculating brightness and contrast from integrated brightness can be expressed as follows:

           
If(Luminance<50)

{

Brightness＝(Luminance＜＜1)/5;

Contract=(Luminance<<3)/5;

}

If(Luminance＞50)

{

Brightness＝20+((Luminance-50)＜＜3)/5;

Contract＝80+((Luminance-50)＜＜1)/5;

}

        

Among them, the parameter "Luminance" indicates the comprehensive brightness, "Brightness" indicates the brightness, and "Contract" indicates the contrast; the operator "<<" indicates that an operand is shifted to the right by n bits, that is, an operand is increased by 2.sup.n times. For example, the comprehensive brightness acquisition module 21 of the single-chip microcomputer 2 obtains a value of 25 for the comprehensive brightness, and then the brightness calculation module 22 can calculate the value of the brightness by the virtual code "Brightness=(Luminance<<1)/5" to be 10; and the contrast calculation module 23 The value of the contrast calculated by the dummy code "Contract=(Luminance<<3)/5" is 40. To sum up, the value of integrated brightness input by the user from button 1, and the value of brightness and contrast calculated by single-chip microcomputer 2 can be represented by Table (1):

Table (1) Integrated brightness 0 6 12 18 25 31 37 43 50 57 65 72 80 85 90 95 100 Brightness 0 2 5 7 10 12 15 17 20 32 44 56 68 76 84 92 100 Contrast 0 0 6 0 0 5 0 30 80 83 86 89 90 92 94 98 100

As shown in FIG. 3 , it is a flow chart of the brightness and contrast adjustment method of the present invention. According to the desired image display effect, the user selects the left key 11 of the key 1 or selects the right key 12 to input a value to decrease or increase the overall brightness. It is judged whether the user selects the left button 11 or the right button 12 (step S1). If the user selects the left button 11, then the integrated brightness acquisition module 21 of the single-chip microcomputer 2 obtains a numerical value that the user inputs to reduce the integrated brightness, and is displayed on the display screen (step S2); The module 21 acquires a value input by the user to increase the overall brightness, and displays it on the display screen (step S3). The brightness calculation module 22 of the single-chip microcomputer 2 calculates the corresponding brightness value according to the integrated brightness value, and the contrast calculation module 23 calculates the corresponding contrast value according to the integrated brightness value (step S4). The digital-to-analog converter 3 converts the calculated brightness and contrast values into voltage pulse signals (step S5). The pulse width modulation module 41 of the signal amplifier 4 scales and adjusts the amplitude width of the voltage pulse signal of brightness and contrast, and outputs the voltage pulse signal of brightness and contrast in the transmission mode of low voltage differential signal (LVDS) (step S6). The backlight controller 5 receives and controls the low-voltage differential signal of brightness and contrast, and then displays the adjusted brightness and contrast effect on the display screen 6 (step S7), so as to achieve the brightness and contrast required by the user on the display screen.

Claims (9)

1. brightness and contrast adjusting gear, can in display device, adjust brightness and contrast that image shows, it comprises a button, a single-chip microcomputer, a digital to analog converter, a signal amplifier, a backlight controller, a display screen and a power supply, it is characterized in that:

Button is used to accept the numerical value that the user imports a comprehensive brightness;

Single-chip microcomputer is used to obtain the numerical value of the comprehensive brightness of described input, and calculates the numerical value of a brightness and a contrast from this comprehensive brightness, and this single-chip microcomputer comprises:

One comprehensive luminance acquisition module is used to obtain the numerical value from the comprehensive brightness of described input;

One brightness calculation module is used for calculating from described comprehensive brightness the numerical value of a brightness; And

One contrast computing module is used for calculating a pair of numerical value than degree from described comprehensive brightness;

The numerical value that digital to analog converter is used for the brightness that will be calculated by described single-chip microcomputer and contrast converts the voltage pulse signal of brightness and contrast to;

Signal amplifier is used for the amplitude width of the voltage pulse signal of brightness of being changed out by described digital to analog converter and contrast is carried out the convergent-divergent adjustment, and with the way of output output brightness of Low Voltage Differential Signal and the voltage pulse signal of contrast;

Backlight controller is used to receive the Low Voltage Differential Signal of described brightness and contrast, and controls the image demonstration of the Low Voltage Differential Signal of this brightness and contrast.

2. brightness as claimed in claim 1 and contrast adjusting gear is characterized in that, its user only imports the image demonstration that described comprehensive brightness just can be adjusted described brightness and contrast simultaneously from described one key.

3. brightness and contrast method of adjustment, it can adjust brightness and contrast that image shows in display device, it is characterized in that this brightness and contrast method of adjustment comprise the steps:

Accept the user and import a comprehensive brightness;

Obtain the numerical value of described comprehensive brightness;

From the numerical value of described comprehensive brightness, calculate the numerical value of a brightness and a contrast;

The numerical value of described brightness and contrast is converted into the voltage pulse signal of brightness and contrast;

Adjust the voltage pulse signal of described brightness and contrast; And

The image effect that shows adjusted brightness and contrast.

4. brightness as claimed in claim 3 and contrast method of adjustment is characterized in that, the described method of calculating brightness from comprehensive brightness is: when described comprehensive brightness smaller or equal to 50% the time, then brightness=(comprehensive brightness * 2.sup.1)/5.

5. brightness as claimed in claim 3 and contrast method of adjustment is characterized in that, the described method of calculating brightness from comprehensive brightness also is: when described comprehensive brightness greater than 50% the time, brightness=20+ ((comprehensive brightness-50) * 2.sup.3)/5 then.

6. brightness as claimed in claim 3 and contrast method of adjustment is characterized in that, describedly from the comprehensive brightness method of calculating contrast of falling into a trap are: when described comprehensive brightness smaller or equal to 50% the time, then contrast=(comprehensive brightness * 2.sup.3)/5.

7. brightness as claimed in claim 3 and contrast method of adjustment, it is characterized in that, describedly also be from the comprehensive brightness method of calculating contrast of falling into a trap: when described comprehensive brightness greater than 50% the time, contrast=80+ ((comprehensive brightness-50) * 2.sup.1)/5 then.

8. brightness as claimed in claim 3 and contrast method of adjustment, it is characterized in that, the setting range of described brightness and contrast is: when the comprehensive brightness of user's input was 0% to 50%, then the setting range of brightness was 0% to 20%, and the setting range of contrast is 0% to 80%.

9. brightness as claimed in claim 3 and contrast method of adjustment, it is characterized in that, the setting range of described brightness and contrast also is: when the comprehensive brightness of user's input is 50% to 100%, then the setting range of brightness is 20% to 100%, and the setting range of contrast is 80% to 100%.

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