TW201816759A - Method for improving display quality of display and display the backlight module generates backlight brightness according to the adjusted backlight value while the display panel displays the adjusted image. - Google Patents

Abstract

A method for improving the display quality of a display includes steps of: having the display driving module of the display to use the CABC algorithm to adjust the grayscale values of an image into an adjusted image and generate a backlight value corresponding to the adjusted image; dividing the color saturation range into N (N is an integer and N ≥ 2) intervals and setting a gain value for each interval. The display driving module obtaining the gain value which corresponds to the interval the saturation of the image is in and obtaining an adjusted backlight value according to the backlight value and the gain value; outputting the adjusted image to the display panel of the display; and outputting adjusted backlight value to the backlight module of the display. As such, the backlight module generates the backlight brightness according to the adjusted backlight value while the display panel displays the adjusted image.

Description

Method for improving display quality of display and display

The invention relates to a display method of a display, and particularly to a method for improving the display quality of a display.

As shown in FIG. 1, a conventional terminal electronic device, such as a mobile phone, mainly includes a host 1 and a display 2. A central processing unit 11 of the host 1 outputs an image to be displayed to a display driving chip 20 of the display 2. After the image is properly processed, the image is output to a display panel 21 of the display 2 and a backlight control signal (for example, a backlight value) is output to a backlight module 22 of the display 2 at the same time, so that according to the backlight control signal Generates corresponding backlight brightness.

However, since the backlight module 22 consumes considerable power, in order to reduce the power consumption of the backlight module 22, it is known that a backlight power saving technology is to allow the display driving chip 20 to execute a CABC (Content The Adaptive Brightness Control algorithm analyzes the R (red), G (green), and B (blue) values of the image to adjust the grayscale value (that is, grayscale brightness) of the image and adjust the backlight accordingly. The backlight brightness of the module 22, for example, increases the grayscale value (grayscale brightness) of the image by 30% and reduces the backlight brightness of the backlight module 22 correspondingly by 30%, thereby outputting the adjusted image to the display panel When 21 is displayed, it still looks consistent with the original image, and the power consumption of the backlight module 22 is relatively reduced, thereby achieving the purpose of power saving.

However, when the saturation of the image to be displayed on the display 2 is high, if the backlight brightness of the backlight module 22 is insufficient, the display quality of the image on the display panel 21 will be affected.

Therefore, an object of the present invention is to provide a method and a display for improving the display quality of a display while taking into consideration the reduction of power consumption and the display quality.

Therefore, the method for improving display quality of a display according to the present invention includes a display driving module that accepts an image input, a backlight module and a display panel electrically coupled to the display driving module; the method includes: (A) The display driving module uses the CABC algorithm to adjust the grayscale value of the image into an adjusted image, and generates a backlight value corresponding to the adjusted image; (B) The display driving module will The color saturation range is divided into N (N is an integer and N ≧ 2) intervals, and each interval corresponds to a gain value; (C) The display driving module judges that the saturation of the image mainly falls in these intervals Which interval to obtain the gain value corresponding to the interval; and (D) the display driving module obtains an adjusted backlight value based on the backlight value and the gain value, and outputs the adjusted image to The display panel and the adjusted backlight value are output to the backlight module, so that the backlight module generates a backlight brightness according to the adjusted backlight value while the display panel displays the adjusted image.

In an embodiment of the present invention, in step (B), N is 8, the range of each interval is not fixed, and the gain values are 8 values taken from 0 ~ 2.

In an embodiment of the present invention, in step (C), the display driving module transfers the RGB value of the image to the HSL (ie, Hue, Saturation, Lightness) domain. Or HSV (that is, hue, saturation, and lightness) fields to find the saturation of each pixel in the image and count which of these intervals it falls in, in order to set the most pixels The interval in which the saturation falls falls as the interval in which the saturation of the image mainly falls.

In an embodiment of the present invention, in step (D), the display driving circuit multiplies the backlight value and the gain value to obtain the adjusted backlight value. The backlight module includes a driving circuit and a receiving circuit. A backlight source driven by a PWM (pulse width modulation) signal output by the driving circuit, and the driving circuit determines a duty cycle of the PWM signal according to the adjusted backlight value.

In an embodiment of the present invention, in step (B), the gain values of the intervals are sequentially increased.

The effect of the present invention lies in that the present invention uses the CABC algorithm to flexibly adjust the backlight value of the backlight module according to the image content to be displayed, and obtains a corresponding gain according to the saturation of the image to be displayed. Value and adjust the backlight value according to the gain value, so that the adjusted backlight value can reduce the power consumption of the backlight module and increase the backlight brightness generated by the backlight module when the image saturation is higher. , And improve the display quality of the image on the display, so it can indeed achieve the purpose of cost invention to consider both power saving and display quality.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are represented by the same numbers.

Referring to FIG. 2, a main flowchart of an embodiment of a method for improving display quality of a display according to the present invention is applied to a display 3 shown in FIG. 3. The display 3 is electrically coupled to a host 4 to receive An image output from the host computer 4 is displayed. The display 3 is a flat display, such as a liquid crystal display or other display requiring a backlight, and has a display driving module (or display driving chip) 30 that accepts the above-mentioned image input, and is electrically coupled to the display driving module 30 Then, a backlight module 31 for generating backlight brightness and a display panel 32 for displaying an image output by the display driving module 30. The display 3 may be an independent display device, and the host 4 may be a personal computer host or a similar terminal device electrically coupled to the display 3, which mainly includes a central processing unit 41 and other necessary components, such as Motherboard, memory, hard drive ... etc. In addition, as shown in FIG. 4, the display 3 and the host 4 in this embodiment may also be integrated into a terminal electronic device 5, such as a notebook computer, a tablet computer, a mobile phone, or other terminal devices that need to have a display.

And in order to achieve the purpose of saving energy and improving the display quality of the display 3, as shown in step S1 of FIG. 2, when the central processing unit 41 of the host 4 outputs an image to the display driving module 30 of the display 3, the display driving module 30 receives After arriving at the image, the CABC (Content Adaptive Brightness Control) algorithm is used to adjust the grayscale value of the image (that is, the grayscale brightness) into an adjusted image, and generate an image with the adjustment. The corresponding backlight value; more precisely, the CABC algorithm analyzes the RGB values of the entire image (that is, the grayscale values of the three primary colors of red, green, and blue) to determine the grayscale brightness (grayscale value) of the entire image ) How much it can be increased, for example, if it is increased by 30%, the grayscale value (grayscale brightness) of the entire image is increased by 30% to become an adjusted image, and a corresponding control is generated according to the adjusted image. The backlight value of the backlight brightness generated by the backlight module 31. For example, if a previously fixed backlight value is lowered by 30%, the backlight value corresponding to the adjusted image is 70% of the original backlight value. The back image is complementary to make the adjusted image (that is, after increasing the grayscale value Image) to the display appear identical to the original image when the display panel 32.

At the same time, in order to improve the display quality of the display panel 32 displaying a highly saturated image, as shown in step S2 of FIG. 2, the display driving module 30 divides the color saturation range into N in advance (N is an integer and N ≧ 2). The intervals are, for example, the eight intervals S1 to S8 shown in FIG. 5, and the ranges of the eight intervals S1 to S8 are not fixed, that is, the ranges of the intervals S1 to S8 may be the same or different, as shown in FIG. 5. And the display driving module 30 sets a gain value corresponding to the eight sections S1 to S8 in eight registers, and the gain value of the sections S1 to S8 can be high first, then low or sequentially increasing. (As shown in this embodiment), it is not limited to this. For example, if the range of the gain value is set between 0 and 2, according to the actual application requirements, you can select 8 consecutively increasing gain values from the 17 groups of gain values shown in Table 1 below to fill in the corresponding register. The setting of the gain values in the eight sections S1 to S8 is completed. Taking the register with 5 bits as an example, the following table 1 lists the 17 sets of gain values corresponding to the bit values set in the register. For example, when the register corresponding to the interval S1 is filled with the bit value 00010, it means that the gain value of the interval S1 is set to 0.25, and when the register corresponding to the interval S5 is filled with the bit value 01010, it means the interval S5 The gain value is set to 1.25. Table 1

Therefore, as shown in FIG. 5, the range of the eight intervals S1 to S8 and the corresponding gain value can be, for example, 0.25, 0.5; 0.75, 1, 1.25, 1.5, 1.75, 2, or other sequentially increasing. The gain value or other gain values set according to actual application requirements are not limited to this.

And, as shown in step S3 of FIG. 2, the display driving module 30 determines which of the sections S1 to S8 the saturation of the image to be output to the display panel 32 mainly falls to obtain the gain value corresponding to the section. To be more precise, in order to know the saturation of the image, the display driving module 30 converts the RGB value of the image into the HSL domain (space) or the HSV domain (space) to obtain the image The saturation of each pixel in the image, and statistics on which of the intervals S1 to S8 the saturation of each pixel falls into, thereby obtaining a statistical value corresponding to each of the intervals, and The interval of the statistical value is used as the interval in which the saturation of the image mainly falls.

Then, as shown in step S4 in FIG. 2, the display driving module 30 obtains an adjusted backlight value according to the backlight value obtained in the above step S1 and the gain value obtained in the above step S3. For example, in this embodiment, the display drive The module 30 multiplies the backlight value and the gain value to obtain the adjusted backlight value, and the display driving module 30 outputs the adjusted backlight value to the display panel 32 when outputting the adjusted image to the display panel 32. The backlight module 31, as shown in step S5 in FIG. 2, causes the backlight module 31 to generate the backlight brightness according to the adjusted backlight value while the display panel 32 displays the adjusted image.

More specifically, as shown in FIG. 6, the backlight module 31 of this embodiment includes a driving circuit 33 and a backlight 34 driven by a PWM signal output from the driving circuit 33, such as a plurality of light-emitting diodes connected in series. The driving circuit 33 determines the duty cycle of the PWM signal according to the adjusted backlight value provided by the display driving module 30, thereby controlling the brightness of the backlight generated by the backlight 34. Therefore, when the adjusted backlight value calculated by the display driving module 30 is less than 1, the duty cycle of the PWM signal is less than 100% and changes corresponding to the change of the adjusted backlight value. When the adjusted backlight value is greater than or equal to 1, the duty cycle of the PWM signal is maintained at 100%.

Therefore, when the image saturation is higher, the backlight value determined by the CABC algorithm is adjusted in a timely manner through the gain value corresponding to the image saturation obtained in the above step S3, so that the adjusted backlight value can follow the image The saturation is increased and relatively increased, so that the backlight module 31 can generate sufficient backlight brightness when the image has high saturation, thereby improving the display quality of the image on the display panel 32.

In summary, the above-mentioned embodiment of the present invention uses the CABC algorithm to flexibly adjust the backlight value of the backlight module 31 according to the content of the image to be displayed, and obtains the corresponding value according to the saturation of the image to be displayed. And adjust the backlight value according to the gain value, so that the adjusted backlight value can reduce the power consumption of the backlight module 31 and increase the backlight module correspondingly when the image saturation is higher. The backlight brightness generated by 31 improves the display quality of the image on the display 3, so the purpose of the invention can be achieved by taking into account both power consumption and display quality.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application and the contents of the patent specification of the present invention are still Within the scope of the invention patent.

1‧‧‧host

2‧‧‧ Display

20‧‧‧Display driver chip

21‧‧‧Display Panel

22‧‧‧ backlight module

Steps S1 ~ S5‧‧‧‧

3‧‧‧ Display

4‧‧‧host

5‧‧‧Terminal electronic device

30‧‧‧Display driver module

31‧‧‧ backlight module

32‧‧‧Display Panel

33‧‧‧Drive circuit

34‧‧‧ backlight

41‧‧‧Central Processing Unit

S1 ~ S8‧‧‧ interval

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a schematic diagram showing a conventional mobile phone having a host and a display; FIG. 2 shows an improved display of the present invention The main flowchart of an embodiment of the method for displaying quality; FIG. 3 is a schematic diagram showing that the host and the display of this embodiment are independent electronic devices; FIG. 4 is a schematic diagram showing the host and the display of the embodiment The display is integrated into a terminal electronic device; FIG. 5 is a chart in which the color saturation range is divided into eight sections; and FIG. 6 is a schematic view in which the backlight module of this embodiment includes a driving circuit and a Backlight.

Claims (10)

A method for improving display quality of a display. The display has a display driving module that accepts an image input, a backlight module and a display panel electrically coupled to the display driving module. The method includes: (A) The display driving module uses the CABC algorithm to adjust the grayscale value of the image into an adjusted image, and generates a backlight value corresponding to the adjusted image; (B) the display driving module changes the color saturation The range is divided into N (N is an integer and N ≧ 2) intervals, and a gain value corresponding to each interval is set; (C) The display driving module judges which of the intervals the saturation of the image mainly falls into. An interval to obtain the gain value corresponding to the interval; and (D) the display driving module obtains an adjusted backlight value according to the backlight value and the gain value, and outputs the adjusted image to the display panel And outputting the adjusted backlight value to the backlight module, so that the backlight module generates the backlight brightness according to the adjusted backlight value while the display panel displays the adjusted image. As described in claim 1, the method for improving the display quality of the display, in step (B), N is 8, the range of each interval is not fixed, and the gain values are 8 values taken from 0 ~ 2. The method for improving the display quality of a display device as described in claim 1. In step (C), the display driving module transfers the RGB value of the image to the HSL domain or the HSV domain to obtain each of the images. The saturation of a pixel and statistics which interval it falls into, and a statistical value corresponding to each interval is obtained, and the interval with the largest statistical value is used as the saturation of the image. Into the interval. The method for improving the display quality of a display device as described in claim 1. In step (D), the display driving circuit multiplies the backlight value and the gain value to obtain the adjusted backlight value. The backlight module includes a driver. A circuit and a backlight source driven by a PWM signal output from the driving circuit, and the driving circuit determines a duty cycle of the PWM signal according to the adjusted backlight value. As described in claim 1, the method for improving the display quality of the display, in step (B), the gain values of the intervals are sequentially increased. A display includes a display driving module that accepts an image input, a backlight module and a display panel that are electrically coupled to the display driving module, and is characterized in that: the display driving module adjusts the CABC algorithm to The grayscale value of the image becomes an adjusted image, and a backlight value corresponding to the adjusted image is generated, and the color saturation range is divided into N (N is an integer and N ≧ 2) intervals, and set Each interval corresponds to a gain value; and the display driving module determines which of the intervals the saturation of the image mainly falls in to obtain the gain value corresponding to the interval, and according to the backlight value and The gain value obtains an adjusted backlight value, and outputs the adjusted image to the display panel and the adjusted backlight value to the backlight module, so that the backlight module displays the adjusted image on the display panel. At the same time, the backlight brightness is generated according to the adjusted backlight value. The display according to claim 6, wherein N is 8, the range of each interval is not fixed, and the gain values are 8 values taken from 0 to 2, and the gain values of the intervals are in order Incrementally. The display according to claim 6, wherein the display driving module transfers the RGB value of the image to the HSL domain or the HSV domain, so as to obtain the saturation of each pixel in the image and calculate whether it falls on Which of the intervals is the interval in which the saturation of the most pixels falls as the interval in which the saturation of the image mainly falls. The display according to claim 6, wherein the display driving module multiplies the backlight value and the gain value to obtain the adjusted backlight value. The backlight module includes a driving circuit and a driving circuit outputted by the driving circuit. A backlight source driven by a PWM signal, and the driving circuit determines a duty cycle of the PWM signal according to the adjusted backlight value. The display according to claim 6, wherein the gain values of the intervals are sequentially increased.