TWI601117B - Methods and displays for improving the display quality of the display - Google Patents

Description

Method and display for improving display quality of display

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

Referring to FIG. 1 , a terminal electronic device, such as a mobile phone, mainly includes a host 1 and a display 2, and 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 outputted to a backlight module 22 of the display 2 to enable the backlight control signal according to the backlight. Produce a corresponding backlight brightness.

However, since the backlight module 22 consumes a considerable amount of power, in order to reduce the power consumption of the backlight module 22, a backlight power saving technique is used to cause the display driving chip 20 to execute a CABC (Content) before outputting an image to the display panel 21. Adaptive Brightness Control, content corresponds to backlight control) The algorithm analyzes the R (red) G (green) B (blue) value of the image to adjust the grayscale value of the image (ie, grayscale brightness) according to the analysis result and adjust the backlight accordingly. The brightness of the backlight of the module 22, for example, the grayscale value of the image (grayscale The brightness is increased by 30% and the backlight brightness of the backlight module 22 is lowered by 30%, so that the adjusted image is output to the display panel 21 when it is displayed, and still looks the same as the original image, and the backlight module 22 is made. The power consumption is relatively reduced, and the purpose of power saving is achieved.

However, when the saturation of the image to be displayed by 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.

Accordingly, it is an object of the present invention to provide a method and display for improving the display quality of a display while reducing power consumption and display quality.

Therefore, the present invention has a display driving module that receives an image input and a backlight module and a display panel that are electrically coupled to the display driving module. The method includes: (A) the display driver module uses the CABC algorithm to adjust the grayscale value of the image to become an adjusted image, and generates a backlight value corresponding to the adjusted image; (B) the display driver 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 determines that the saturation of the image mainly falls in the interval Which of the intervals is 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 outputs the adjusted backlight value to the backlight module, so that the backlight module displays the adjusted image on the display panel, according to The adjusted backlight value produces backlight brightness.

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

In an embodiment of the invention, in step (C), the display driving module transfers the RGB value of the image to the HSL (ie, Hue, Saturation, Lightness) domain. Or the HSV (ie, Hue, Saturation, Value) field to determine the saturation of each pixel in the image and to count which interval in the interval it is in order to maximize the pixel This interval in which the saturation falls is taken 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 module multiplies the backlight value by the gain value to obtain the adjusted backlight value, and the backlight module includes a driving circuit and a receiving The PWM circuit outputs a PWM (pulse width modulation) signal-driven backlight, and the driving circuit determines a duty cycle of the PWM signal according to the adjusted backlight value.

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

The effect of the present invention is that the present invention elastically adjusts the backlight value of the backlight module according to the image content to be displayed by the CABC algorithm, 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 not only reduce the power consumption of the backlight module, but also When the image saturation is higher, the brightness of the backlight generated by the backlight module is increased, and the display quality of the image on the display is improved, so that the present invention can achieve the purpose of both power saving and display quality.

1‧‧‧Host

2‧‧‧Display

20‧‧‧Display driver chip

21‧‧‧ display panel

22‧‧‧Backlight module

S1~S5‧‧‧Steps

3‧‧‧ display

4‧‧‧Host

5‧‧‧Terminal electronic devices

30‧‧‧Display Driver Module

31‧‧‧Backlight module

32‧‧‧ display panel

33‧‧‧Drive circuit

34‧‧‧ Backlight

41‧‧‧Central processor

S1~S8‧‧‧

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a schematic diagram showing a conventional mobile phone having a host and a display; FIG. 2 showing the 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 the host and the display of the embodiment are independent electronic devices; FIG. 4 is a schematic diagram showing the host of the embodiment and The display is integrated in a terminal electronic device; FIG. 5 is a diagram in which the display color saturation range is divided into eight sections; and FIG. 6 is a schematic diagram showing the backlight module of the embodiment including a driving circuit and a Backlight.

Before the present invention is described in detail, attention should be paid to the following description. In the like, similar elements are denoted by the same reference numerals.

2 is a main flow chart of an embodiment of a method for improving the display quality of a display of the present invention. The display is applied to a display 3 as shown in FIG. 3, and the display 3 is electrically coupled to a host 4 to accept An image output by the host 4 is displayed. The display 3 is a flat display, such as a liquid crystal display or other display that requires a backlight, and has a display driving module (or display driving chip) 30 that accepts the image input, and is electrically coupled to the display driving module 30. And 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 can be a stand-alone display device, and the host 4 can be a personal computer host or 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 of the present embodiment can also be integrated in a terminal electronic device 5, such as a notebook computer, a tablet computer, a mobile phone, or other terminal device that requires a display.

In order to achieve energy saving and improve 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 the image is obtained, the CABC (Content Adaptive Brightness Control) algorithm is used to adjust the grayscale value (ie, grayscale brightness) of the image to become an adjusted image, and an adjusted image is generated. Corresponding backlight value; more specifically, CABC The algorithm analyzes the RGB values of the entire image (ie, the grayscale values of the three primary colors of red, green, and blue) to determine how much the grayscale brightness (grayscale value) of the entire image can be increased, for example, by 30%. , the grayscale value (grayscale brightness) of the entire image is increased by 30% into an adjusted image, and a backlight value for controlling the backlight brightness generated by the backlight module 31 is generated according to the adjusted image correspondingly. For example, if the original fixed backlight value is turned down by 30%, the backlight value corresponding to the adjusted image is 70% of the original backlight value, thereby complementing the adjusted image, so that the adjusted image is adjusted. The output (i.e., the image after the grayscale value is increased) appears to be consistent with the original image when displayed on the display panel 32.

Meanwhile, in order to improve the display quality of the image in which the display panel 32 displays a high saturation, as shown in step S2 of FIG. 2, the display driving module 30 divides the color saturation range into N (N is an integer and N ≧ 2) in advance. For example, the eight sections S1 to S8 shown in FIG. 5 are not fixed, and the ranges of the sections S1 to S8 may be the same or different, for example, as shown in FIG. 5 . The display driver module 30 sets a gain value corresponding to each of the eight sections S1 to S8 in the eight temporary registers, and the gain values of the sections S1 to S8 may be first high, then low, or sequentially incremented. (as shown in this embodiment), not limited to this. For example, if the gain value range is set between 0 and 2, depending on the actual application requirements, 8 consecutive gain values from the 17 sets of gain values shown in Table 1 below may be filled into the corresponding register. In the middle, the setting of the gain values of the eight sections S1 to S8 is completed. Taking the scratchpad with 5 bits as an example, Table 1 below lists the 17 sets of gain values corresponding to the bit values set in the scratchpad. For example, when the temporary storage corresponding to the interval S1 When the bit value is 00010, the gain value of the section S1 is set to 0.25, and when the register corresponding to the section S5 is filled with the bit value 01010, the gain value of the section S5 is set to 1.25.

Therefore, as shown in FIG. 5, the range of the eight sections S1 to S8 and their corresponding gain values may be, for example, 0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, or other sequential increments from low to high. The gain value or other gain value set according to the actual application requirements is not limited to this.

As shown in step S3 of FIG. 2, the display driving module 30 determines which of the intervals 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 interval. More precisely, to know the image The saturation, display driver module 30 will convert the RGB value of the image to the HSL domain (space), or to the HSV domain (space) to obtain the saturation of each pixel in the image, and statistics The saturation of each pixel is which of the intervals S1 to S8, thereby obtaining a statistical value corresponding to each of the intervals, and using the interval having the largest statistical value as the image. The interval in which saturation falls mainly.

Then, as shown in step S4 of 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 step S3. For example, in the embodiment, the display driving is performed. The module 30 multiplies the backlight value by 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 simultaneously. The backlight module 31 is configured to cause the backlight module 31 to display the adjusted image on the display panel 32 and to generate the backlight brightness according to the adjusted backlight value, as shown in step S5 of FIG. 2 .

More specifically, as shown in FIG. 6, the backlight module 31 of the present embodiment includes a driving circuit 33 and a PWM signal-driven backlight 34 outputted by the driving circuit 33, for example, a plurality of LEDs 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 backlight brightness generated by the backlight 34. Therefore, when the backlight value of the adjustment generated by the display driving module 30 is less than 1, the duty cycle of the PWM signal is less than 100%, and changes according to the change of the adjusted backlight value, and if the display driving module 30 is calculated, When the adjusted backlight value is greater than or equal to 1, the duty cycle of the PWM signal Maintain at 100%.

Therefore, when the saturation of the image is higher, the backlight value determined by the CABC algorithm is adjusted in time by the gain value corresponding to the image saturation obtained by 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 embodiment of the present invention is used to control the backlight value of the backlight module 31 according to the image content to be displayed by the CABC algorithm, and correspondingly according to the saturation of the image to be displayed. a gain value, and adjusting 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 can increase the backlight module when the image saturation is higher. The brightness of the backlight generated by 31 improves the display quality of the image on the display 3. Therefore, the present invention can achieve the object of reducing power consumption and display quality.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the simple equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still Within the scope of the invention patent.

S1~S5‧‧‧Steps

Claims (10)

A display driving module that receives an image input and a backlight module and a display panel electrically coupled to the display driving module; the method includes: (A) The display driving module adjusts the grayscale value of the image into an adjusted image by using a Content Adaptive Brightness Control algorithm, and generates a backlight value corresponding to the adjusted image; (B) The display driving module divides the color saturation range into N (N is an integer and N ≧ 2) intervals, and sets each interval corresponding to a gain value; (C) the display driving module determines the saturation of the image Which of the intervals is mainly in the 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 And the adjusted image is sent to the display panel, and the adjusted backlight value is output to the backlight module, so that the backlight module displays the adjusted image on the display panel, and generates backlight brightness according to the adjusted backlight value. . In the method of improving the display quality of the display as described in claim 1, in step (B), N is 8, the range of each section is not fixed, and the gain values are 8 values taken out from 0 to 2. In the method of claim 1, the display driver module converts the RGB value of the image to Hue, Saturation, and Lightness. Domain or hue, saturation The Saturation and Value fields are used to obtain the saturation of each pixel in the image and to calculate which interval in the interval, and obtain a statistical value corresponding to each of the intervals. And the interval having the largest statistical value is taken as the interval in which the saturation of the image mainly falls. The method of claim 1, wherein the display driving module multiplies the backlight value by the gain value to obtain the adjusted backlight value, and the backlight module includes a backlight module. a driving circuit and a backlight driven by a PWM 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 the method of improving the display quality of the display as described in claim 1, in step (B), the gain values of the intervals are sequentially incremented. A display comprising a display driving module receiving an image input and a backlight module and a display panel electrically coupled to the display driving module; wherein the display driving module utilizes content corresponding backlight control ( The Content Adaptive Brightness Control algorithm adjusts the grayscale value of the image to an adjusted image, and generates a backlight value corresponding to the adjusted image, and divides the color saturation range into N (N is an integer and N≧2) intervals, and setting each interval corresponding to a gain value; and the display driving module determines which of the intervals is the saturation of the image mainly to obtain the corresponding interval of the interval a gain value, and obtaining an adjusted backlight value according to the backlight value and the gain value, and outputting the adjusted image to the display panel and outputting the adjusted backlight value to the backlight module, so that the backlight module is The display panel displays the adjusted image while, according to the The adjusted backlight value produces backlight brightness. The display of 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 sequentially Increment. The display device of claim 6, wherein the display driving module shifts the RGB value of the image to Hue, Saturation, Lightness or Hue, and Saturation ( Saturation), the value field, to determine the saturation of each pixel in the image and to calculate which interval in the interval to fall in the interval where the saturation of the most pixels falls. As the interval in which the saturation of the image mainly falls. The display device of claim 6, wherein the display driving module multiplies the backlight value by the gain value to obtain the adjusted backlight value, the backlight module includes a driving circuit and a output by the driving circuit a PWM signal-driven backlight, and the driving circuit determines a duty cycle of the PWM signal according to the adjusted backlight value. The display of claim 6, wherein the gain values of the intervals are sequentially incremented.