TWI879465B - Regional backlight control module, backlight driver chip and information processing device - Google Patents

Abstract

The present invention mainly discloses a regional backlight control module, which is integrated in a backlight driver chip, and is used to divide an image corresponding to a display data into X×Y image blocks to respectively correspond to X×Y backlight areas of a backlight unit, and perform a regional feature value extraction operation, a regional backlight value calculation operation and a backlight value-driving value mapping operation on each of the image blocks, and output a corresponding driving data of each of the backlight areas. Then, after performing filtering processing on the X×Y driving data to generate X×Y backlight driving data, X×Y PWM signals are correspondingly generated according to the X×Y backlight driving data and transmitted to an LED driving circuit of the backlight unit. Finally, the LED driving circuit performs backlight driving control on the X×Y backlight areas according to the X×Y PWM signals.

Description

Regional backlight control module, backlight driver chip and information processing device

The present invention relates to the field of zoned backlight control, and in particular to a zone backlight control module used to control a display with a non-square screen.

With the improvement of automobile manufacturing technology, manufacturers are constantly innovating the design of vehicle appearance and interior. One of the innovative designs is to change the display of the vehicle entertainment device to a display with a non-square screen. Figure 1 is a block diagram of a known display with a non-square screen. As shown in Figure 1, the display 1a with a non-square screen includes: a liquid crystal display module 11a, at least one display driver chip 12a, at least one backlight driver chip 13a, and a timing control chip 14a, wherein the liquid crystal display module 11a includes a non-square liquid crystal display panel 111a and a backlight unit 112a including M×N LED elements, where M and N are both positive integers.

In recent years, as High-Dynamic Range (HDR) technology has been widely used in liquid crystal displays and liquid crystal televisions, the backlight driver chip 13a has also been improved and designed to have a local dimming function. Local dimming refers to dividing the backlight unit 112a into X×Y backlight blocks, each of which contains s×t LED elements, and s, t, X, and Y are all positive integers of at least 1. During normal operation, the timing control chip 14a transmits a synchronization signal and a display data to the display driver chip 12a and the backlight driver chip 13a, so that the display driver chip 12a drives the liquid crystal display panel 111a according to the display data. At the same time, the backlight driver chip 13a divides an image corresponding to the display data into X×Y image blocks, and extracts a regional backlight value from each image block through a series of calculations, and then drives the backlight of the X×Y backlight areas accordingly according to the X×Y regional backlight values.

However, as shown in FIG1 , the non-square liquid crystal display panel 111a has multiple curved edges. As can be imagined, the effective area ratio of these edge areas, the center position of the lamp (i.e., LED element) and the lamp type are all different from those of the general area (such as the central area). Therefore, the aforementioned regional dimming method of the known technology is not applicable to the display 1a with a non-square screen. In other words, the known regional dimming method should be modified to be applicable to the regional backlight control of the display 1a with a non-square screen, thereby improving the dynamic contrast of the display 1a with a non-square screen.

From the above description, it can be seen that this field is in urgent need of a regional backlight control module.

The main purpose of the present invention is to provide a regional backlight control module for integration in a backlight driver chip, which is used to divide an image corresponding to a display data into X×Y image blocks to respectively correspond to X×Y backlight areas of a backlight unit, and perform a partition feature value extraction operation, a regional backlight value calculation operation and a backlight value-driving value mapping operation on each of the image blocks, and output a corresponding driving data of each of the backlight areas. Then, after performing filtering processing on the X×Y driving data to generate X×Y backlight driving data, X×Y PWM signals are correspondingly generated according to the X×Y backlight driving data and transmitted to an LED driving circuit of the backlight unit. Finally, the LED driving circuit performs backlight driving control on the X×Y backlight areas according to the X×Y PWM signals.

In particular, the backlight driver chip including the local backlight dimming module of the present invention is suitable for performing local backlight dimming on a display with a non-square screen, and has the following advantages: accurately extracting the partition characteristic values of the general area (such as the central area) and the edge curve area according to the effective area. In addition, the backlight driver chip including the local backlight dimming module of the present invention also has the following advantages: accurately calculating the local backlight value according to the effective area and the partition characteristic value, so that a frame of pixel compensation data generated according to X×Y regional backlight values will not cause over-compensation or under-compensation to the pixels.

To achieve the above-mentioned purpose, the present invention proposes an embodiment of the regional backlight control module, which is integrated in a backlight driver chip, wherein the backlight driver chip and a backlight unit are included in a liquid crystal display, and the backlight unit includes X×Y backlight areas, X and Y are both positive integers; the regional backlight control module includes: a backlight value extraction unit, which is used to divide an image corresponding to a display data into X×Y image blocks to respectively correspond to the X×Y backlight areas, and execute a partition feature value extraction operation and a regional backlight value extraction operation on each of the image blocks; A light value calculation operation and a backlight value-driving value mapping operation are performed to output a corresponding driving data of each backlight area; a filtering unit is coupled to the backlight value extraction unit to perform a filtering process on the X×Y driving data, the filtering process includes a spatial filtering process and a temporal filtering process, and outputs X×Y backlight driving data accordingly; and a PWM signal generating unit is coupled to the filtering unit and is used to generate X×Y PWM signals correspondingly according to the X×Y backlight driving data and transmit them to an LED driving circuit of the backlight unit.

In one embodiment, the backlight value extraction unit includes: a first extraction unit, which is used to calculate an effective area of each of the backlight areas according to the shape of a liquid crystal display panel of the liquid crystal display, and then give a label value (label) to each of the effective areas according to the size, and finally use the label value and the effective area to complete the partition feature value extraction operation, thereby obtaining X×Y partition feature values corresponding to the X×Y backlight areas; a second extraction unit, coupled to the first extraction unit, and used to extract the X×Y partition feature values according to the X×Y partition feature values. ×Y said backlight areas perform a regional backlight value calculation operation, thereby obtaining X×Y regional backlight values corresponding to the X×Y said backlight areas; and a mapping unit, coupled to the second extraction unit, and comprising at least one lookup table, the lookup table comprising a plurality of reference regional backlight values and a plurality of driving values respectively corresponding to the plurality of reference regional backlight values; wherein the mapping unit is used to search in the lookup table to obtain X×Y driving values respectively corresponding to the X×Y said regional backlight values, thereby outputting the driving data of each said backlight area.

In one embodiment, the first extraction unit uses the following equations (1) to (5) to complete the partition feature value extraction operation: If S_area=1.0 * S_normal, R_label=0 and P _feature =1.0 * (P×Q)..............................(1)

If S_area=0, R_label=7 and P _feature =1.0*(P×Q)......(5)

Wherein, S_area is the effective area, S_normal is a normal area of the image block, R_label is the label value, P _feature is the partition feature value, and one image block contains P×Q pixels, and P and Q are both positive integers.

In one embodiment, the second extraction unit uses the following formula (6) to complete the regional backlight value calculation operation:

Wherein, avg is the regional backlight value, and sum is the sum of the grayscale values of the P×Q pixels.

In one embodiment, the filtering unit includes: a first filtering unit for performing a convolution operation on each of the driving data and a convolution kernel to complete the spatial filtering process, and then outputting a first driving data corresponding to the driving data; and a second filtering unit for performing the temporal filtering process on each of the first driving data, and then outputting a backlight driving data corresponding to the first driving data.

In one embodiment, before performing the spatial filtering process, the first filtering unit performs a boundary filling process selected from the group consisting of K-nearest neighbor calculation process, zero filling process, constant filling process, mirror filling process, and copy filling process on the driving data.

In a feasible embodiment, the regional backlight control module of the present invention further includes: a storage unit, coupled between the second filter unit and the PWM signal generating unit, for receiving and storing the X×Y backlight driving data of the nth frame from the second filter unit, and transmitting the X×Y backlight driving data of the n-1th frame to the PWM signal generating unit; and a compensation unit, coupled to the storage unit to receive the X×Y backlight driving data of the n-1th frame, and generating a frame of pixel compensation data according to the X×Y backlight driving data and transmitting it to at least one display driver chip of the liquid crystal display; wherein n is a positive integer.

Furthermore, the present invention also provides an embodiment of a backlight driver chip, which is applied to a liquid crystal display device including a backlight unit, and the backlight unit includes X×Y backlight areas, where X and Y are both positive integers; the characteristic is that a regional backlight control module is integrated in the backlight driver chip, and the regional backlight control module includes: a backlight value extraction unit, which is used to divide an image corresponding to a display data into X×Y image blocks corresponding to the X×Y backlight areas respectively, and perform a regional feature value extraction operation on each of the image blocks, a regional feature value extraction operation on each of the image blocks, and a regional feature value extraction operation on each of the image blocks. A backlight value calculation operation and a backlight value-driving value mapping operation are performed to output a corresponding driving data of each backlight area; a filtering unit is coupled to the backlight value extraction unit to perform a filtering process on the X×Y driving data, the filtering process includes a spatial filtering process and a temporal filtering process, and outputs X×Y backlight driving data accordingly; and a PWM signal generating unit is coupled to the filtering unit and is used to generate X×Y PWM signals correspondingly according to the X×Y backlight driving data and transmit them to an LED driving circuit of the backlight unit.

In one embodiment, the backlight value extraction unit includes: a first extraction unit, which is used to calculate an effective area of each backlight area according to the shape of a liquid crystal display panel of the liquid crystal display device, and then give a label value (label) to each effective area according to the size, and finally use the label value and the effective area to complete the partition feature value extraction operation, thereby obtaining X×Y partition feature values corresponding to X×Y backlight areas; a second extraction unit, coupled to the first extraction unit, and used to A regional backlight value calculation operation is performed on the X×Y backlight regions according to the X×Y partition feature values; and a mapping unit is coupled to the second extraction unit and contains at least one lookup table, the lookup table includes a plurality of reference regional backlight values and a plurality of driving values corresponding to the plurality of reference regional backlight values; wherein the mapping unit is used to search the lookup table to obtain X×Y driving values corresponding to the X×Y regional backlight values, thereby outputting the driving data of each backlight region.

In one embodiment, the first extraction unit uses the following equations (1) to (5) to complete the partition feature value extraction operation: If S_area=1.0 * S_normal, R_label=0 and P _feature =1.0 * (P×Q)..............................(1)

If S_area=0, R_label=7 and P _feature =1.0*(P×Q)......(5)

Wherein, S_area is the effective area, S_normal is a normal area of the image block, R_label is the label value, P _feature is the partition feature value, and one image block contains P×Q pixels, and P and Q are both positive integers.

In one embodiment, the second extraction unit uses the following formula (6) to complete the regional backlight value calculation operation:

Wherein, avg is the regional backlight value, and sum is the sum of the grayscale values of the P×Q pixels.

In one embodiment, the filtering unit includes: a first filtering unit for performing a convolution operation on each of the driving data and a convolution kernel to complete the spatial filtering process, and then outputting a first driving data corresponding to the driving data; and a second filtering unit for performing the temporal filtering process on each of the first driving data, and then outputting a backlight driving data corresponding to the first driving data.

In one embodiment, before performing the spatial filtering process, the first filtering unit performs a boundary filling process selected from the group consisting of K-nearest neighbor calculation process, zero filling process, constant filling process, mirror filling process, and copy filling process on the driving data.

In a feasible embodiment, the regional backlight control module of the present invention further includes: a storage unit, coupled between the second filter unit and the PWM signal generation unit, for receiving and storing the X×Y backlight driving data of the nth frame from the second filter unit, and transmitting the X×Y backlight driving data of the n-1th frame to the PWM signal generation unit; and a compensation unit, coupled to the storage unit to receive the X×Y backlight driving data of the n-1th frame, and generating a frame of pixel compensation data according to the X×Y backlight driving data and transmitting it to at least one display driver chip of the liquid crystal display device; wherein n is a positive integer.

Furthermore, the present invention also provides an embodiment of an information processing device, characterized in that it has at least one backlight driver chip of the present invention as described above. In one embodiment, the information processing device is an electronic device selected from the group consisting of a liquid crystal display, a liquid crystal television, a smart phone, a smart watch, a tablet computer, a laptop computer, an all-in-one computer, a car entertainment system, a head-mounted display device, a video door machine, a multimedia information display device, and a digital camera.

1a: Displays with non-square screens

11a: LCD display module

111a: Non-square LCD panel

112a: Backlight unit

12a: Display driver chip

13a: Backlight driver chip

14a: Timing control chip

1: LCD display device

11: LCD display module

111: LCD panel

112: Backlight unit

113:LED driver circuit

1120:LED components

1121: Backlight area

12: Display driver chip

13: Backlight driver chip

14: Timing control chip

10: Regional backlight control module

101: Backlight value extraction unit

1011: First extraction unit

1012: Second extraction unit

1013: Mapping unit

102: Filter unit

1021: First filter unit

1022: Second filter unit

103: PWM signal generation unit

104: Storage unit

105: Compensation unit

1051: Mixed light diffusion unit

1052: Pixel compensation unit

FIG. 1 is a block diagram of a known display with a non-square screen; FIG. 2 is a block diagram of a liquid crystal display device using a regional backlight control module of the present invention; FIG. 3 is a block diagram of the regional backlight control module shown in FIG. 2; FIG. 4 is a diagram of an edge region of the liquid crystal display module shown in FIG. 2; FIG. 5 is a diagram of 5×5 backlight regions located in the edge region and marked with label values; FIG. 6 is a diagram of drive data of the edge region after border filling processing is completed; FIG. 7 is a side view of an LED element and a liquid crystal display panel in the backlight region; and FIG. 8 is a side view of multiple LED elements and a liquid crystal display panel in the backlight region.

In order to enable the review committee to further understand the structure, features, purpose, and advantages of the present invention, the detailed description of the drawings and preferred specific embodiments is attached as follows.

FIG2 is a block diagram of a liquid crystal display device using a regional backlight control module of the present invention. As shown in FIG2, the liquid crystal display device 1 includes: a liquid crystal display module 11, at least one display driver chip 12, at least one backlight driver chip 13 of the present invention, and a timing control chip 14, wherein the liquid crystal display module 11 includes a liquid crystal display panel 111 and a backlight unit 112 including M×N LED elements, the backlight unit 112 includes X×Y backlight areas, and M, N, X, and Y are all positive integers. It is worth noting that the liquid crystal display panel 111 has multiple curved edges, so its shape is non-square. Furthermore, as shown in FIG. 2 , the present invention proposes a local backlight dimming module 10 integrated into the backlight driver chip 13, so that the backlight driver chip 13 including the local backlight dimming module 10 of the present invention is suitable for performing local backlight dimming on a liquid crystal display device 1 with a non-square screen.

FIG3 is a block diagram of the regional backlight control module 10 shown in FIG2. As shown in FIG3, the regional backlight control module 10 of the present invention mainly includes: a backlight value extraction unit 101, a filter unit 102, a PWM signal generation unit 103, a storage unit 104, and a compensation unit 105, wherein the backlight value extraction unit 101 is used to divide an image corresponding to a display data into X×Y image blocks to respectively correspond to the X×Y backlight areas, and perform a partition feature value extraction operation, a regional backlight value calculation operation and a backlight value-drive value mapping operation on each of the image blocks, and output a corresponding drive data of each of the backlight areas.

To explain in more detail, the backlight value extraction unit 101 includes a first extraction unit 1011, a second extraction unit 1012, and a mapping unit 1013, wherein the first extraction unit 1011 is used to calculate an effective area of each of the backlight areas according to the shape of a liquid crystal display panel 111 of the liquid crystal display 1, and then give a label value (label) to each of the effective areas according to the size, and finally use the label value and the effective area to complete the partition feature value extraction operation, thereby obtaining X×Y partition feature values corresponding to the X×Y backlight areas. Specifically, the first extraction unit 1011 uses the following equations (1) to (5) to complete the partition feature value extraction operation: If S_area=1.0 * S_normal, R_label=0 and P _feature =1.0 * (P×Q)..............................(1)

If S_area=0, R_label=7 and P _feature =1.0*(P×Q)......(5)

In the above formulas (1) to (5), S_area is the effective area, S_normal is a normal area of the image block, R_label is the label value, P _feature is the effective pixel number as the partition feature value, and one image block contains P×Q pixels, and P and Q are both positive integers.

FIG4 is a diagram of an edge region of the liquid crystal display module 11 shown in FIG2. As shown in FIG4, there are 5×5 backlight regions 1121 in the backlight unit 112 located in the edge region, and only 15 of the 5×5 backlight regions 1121 have a complete area, while the other 10 backlight regions 1121 located in or close to the edge region do not have a complete area. Therefore, based on the above characteristics, the present invention enables the first extraction unit 1011 to use the above formulas (1) to (5) to complete the partition feature value extraction operation based on the effective area of each of the backlight regions 1121, and at the same time, each of the backlight regions 1121 is assigned a corresponding label value. FIG5 is a diagram of 5×5 backlight regions located in the edge region and marked with label values. As shown in FIG5, the label values of 15 backlight regions 1121 with complete areas are 0, and the label values of the other 10 backlight regions 1121 without complete areas are 1, 2, or 3. It is additionally explained that the display data sent by the timing control chip 14 is a matrix data, and the matrix data includes a main display data located in a display region of the liquid crystal display panel 111 and an invalid display data (dummy data) located outside the display region. Therefore, correspondingly, the present invention uses a label value of 7 to indicate that the backlight region 1121 is outside the display region, and the backlight region 1121 corresponds to the invalid display data contained in the matrix data.

As shown in FIG3 , the second extraction unit 1012 is coupled to the first extraction unit 1011 and is used to perform a regional backlight value calculation operation on the X×Y backlight regions according to the X×Y partition feature values, thereby obtaining X×Y regional backlight values corresponding to the X×Y backlight regions. Specifically, the second extraction unit 1012 uses the following formula (6) to complete the regional backlight value calculation operation:

In the above formula (6), avg is the regional backlight value, and sum is the sum of the grayscale values of the P×Q pixels. Taking the resolution of the liquid crystal display panel 111 as 1920×1080 as an example, the backlight unit 112 is divided into 32×18 backlight regions 1121, and an image block corresponding to each backlight region 1121 contains 60×60 (i.e., P×Q) pixels. In this case, the regional backlight value of the backlight area 1121 with a label value of 0 is avg=sum/(1.0*60*60), the regional backlight value of the backlight area 1121 with a label value of 1 is avg=sum/(0.75*60*60), and the regional backlight value of the backlight area 1121 with a label value of 7 is avg=sum/(1.0*60*60). It should be noted that since the dummy data is usually grayscale 0, even if the regional backlight value of the backlight area 1121 with a label value of 7 is not specifically set to 0, there will be no effect.

As shown in FIG3 , in the backlight value extraction unit 101, the mapping unit 1013 is coupled to the second extraction unit 1012 and includes at least one lookup table (LUT), the lookup table including a plurality of reference regional backlight values and a plurality of driving values corresponding to the plurality of reference regional backlight values. According to the design of the present invention, the mapping unit 1013 is used to search the lookup table to obtain X×Y driving values corresponding to the X×Y regional backlight values, thereby outputting the driving data of each backlight block. Preferably, when a plurality of lookup tables are preset according to a plurality of label values, the second extraction unit 1012 can obtain the corresponding driving value in the lookup table according to the label value of the backlight area 1121 and the regional backlight value, thereby outputting the driving data of the backlight area 1121. It should be understood that such a method helps to speed up the second extraction unit 1012 to output the corresponding X×Y driving values according to X×Y regional backlight values.

According to the design of the present invention, the filter unit 102 is coupled to the backlight value extraction unit 101 to perform a filter process on the X×Y driving data and output the X×Y backlight driving data accordingly. In one embodiment, the filter unit 102 includes a first filter unit 1021 and a second filter unit 1022, wherein the first filter unit 1021 is used to perform a convolution operation on each of the driving data and a convolution kernel to complete a spatial filter process, and then output a first driving data corresponding to the driving data. Furthermore, the second filtering unit 1022 is used to perform a time filtering process on each of the first driving data, and then output a backlight driving data corresponding to the first driving data. Engineers familiar with the local dimming technology must know that the spatial filtering process and the time filtering process are used to eliminate the spatial backlight unevenness and the temporal backlight flicker.

It is reiterated that the display data sent by the timing control chip 14 is a matrix data, and in the curve edge area, the matrix data includes a main display data located in a display area of the liquid crystal display panel 111 and an invalid display data (dummy data) located outside the display area. Therefore, if an S×T matrix data is designed as the convolution kernel (S and T are positive integers), before the driving data in the edge area and the convolution kernel perform a convolution operation, a boundary padding process must be performed on the driving data in the edge area, so that the matrix size of all driving data can be the same as the matrix size of a frame of display data to ensure the integrity and correctness of the data. Figure 6 is a diagram showing the driving data of the edge area after the border filling process is completed. As shown in Figure 6, the thick black frame indicates the driving data of the 5×5 backlight areas in the edge area, which are BL00~BL04, BL10~BL14, BL20~BL24, BL30~BL34, and BL40~BL44 according to the line.

Engineers familiar with image processing usually use K-nearest neighbors (KNN), zero padding, constant padding, reflect padding, or replicate padding as the boundary filling process. For example, as shown in Figure 6, the left boundary driving data BL00, BL10, BL20, BL30, BL40 can be copied to the left to fill two matrix dimensions (two dimmensions), and then the upper boundary driving data BL00, BL00, BL00, BL01, BL02, BL03, BL04 can be copied upward to fill two matrix dimensions (two dimmensions), that is, the boundary filling processing of the driving data of the 5×5 backlight areas of the edge area is completed. It must be explained that the aforementioned KNN processing, Zero padding processing, Constant padding processing, reflect padding processing, and replicate padding processing are all commonly used boundary filling processing methods, and will not be repeated here.

After completing the border filling process, the first filter unit 1021 performs a convolution operation on the driving data of each backlight area and a convolution kernel to complete the spatial filtering process, and then outputs a first driving data corresponding to the driving data. Then, the second filter unit 1022 performs a temporal filtering process on the first driving data of each backlight area, and then outputs a backlight driving data corresponding to the first driving data. As shown in FIG3 , the storage unit 104 is coupled between the second filter unit 1022 and the PWM signal generation unit 103, and is used to receive and store the X×Y backlight driving data of the nth frame from the second filter unit 1022, and transmit the X×Y backlight driving data of the n-1th frame (n is a positive integer) to the PWM signal generation unit 103. Then, the PWM signal generation unit 103 generates X×Y PWM signals correspondingly according to the X×Y backlight driving data and transmits them to an LED driving circuit 113 of the backlight unit 112.

FIG7 is a side view of an LED element and a liquid crystal display panel in the backlight region, and FIG8 is a side view of multiple LED elements and a liquid crystal display panel in the backlight region. As shown in FIG7, since the light emitted by the LED element 1120 is a diffuse light, the diffuse light will cause a light intensity distribution on the liquid crystal display panel 111. As shown in FIG8, it is conceivable that when the number of LED elements 1120 in the backlight region increases from one to multiple, the light intensity distributions of adjacent LED elements 1120 will overlap with each other, causing the pixel backlight to be affected. Therefore, as shown in FIG. 3 , the regional backlight control module 10 of the present invention further includes a compensation unit 105, which is coupled to the storage unit 104 to receive the X×Y backlight driving data of the n-1th frame, and generates a frame of pixel compensation data according to the X×Y backlight driving data and transmits it to at least one display driver chip 12 of the liquid crystal display 1.

In one embodiment, the compensation unit 105 includes a light mixing diffusion unit 1051 and a pixel compensation unit 1052, wherein the light mixing diffusion unit 1051 contains a plurality of point spread functions (PSF). It should be understood that the PWM signal generating unit 103 generates different PWM signals according to different backlight driving data, thereby driving the LED element 1120 to emit diffuse light of different intensities. Therefore, each point light source diffusion function is used to correspond to a light emitting mode of the LED element 1120, and the mixed light diffusion unit 1051 performs a convolution operation on the X×Y backlight driving data received from the storage unit 104 and a corresponding point light source diffusion function to obtain X×Y first backlight driving data. Here, the first backlight driving data is the backlight driving data with the light intensity distribution after diffuse light diffusion. Then, the pixel compensation unit 1052 is configured to generate a regional pixel compensation data according to the first backlight driving data, and the X×Y regional pixel compensation data constitute a frame of pixel compensation data and transmit it to the display driver chip 12.

Thus, the above has completely and clearly described a regional backlight control module of the present invention; and, from the above, it can be known that the present invention has the following advantages:

(1) The present invention discloses a local backlight dimming module for integration into a backlight driver chip. In particular, the backlight driver chip including the local backlight dimming module of the present invention is suitable for performing local backlight dimming on a display with a non-square screen, and has the following advantages: accurately extracting the partition characteristic values of the general area (such as the central area) and the edge curve area based on the effective area. In addition, the backlight driver chip including the local backlight dimming module of the present invention also has the following advantages: accurately calculating the local backlight value based on the effective area and the partition characteristic value, so that a frame of pixel compensation data generated based on X×Y local backlight values will not cause over-compensation or under-compensation to the pixels.

(2) The present invention also provides an embodiment of a backlight driver chip, which is characterized by comprising at least one regional backlight control module of the present invention.

(3) The present invention also provides an embodiment of an information processing device, characterized in that it has at least one backlight driver chip of the present invention as described above. In one embodiment, the information processing device is an electronic device selected from the group consisting of a liquid crystal display, a liquid crystal television, a smart phone, a smart watch, a tablet computer, a notebook computer, an all-in-one computer, a car entertainment system, a head-mounted display device, a video door machine, a multimedia information display device, and a digital camera.

It must be emphasized that the above-mentioned case is a preferred embodiment. Any partial changes or modifications that are derived from the technical ideas of this case and are easily inferred by people familiar with the art do not deviate from the scope of the patent rights of this case.

In summary, this case shows that it is very different from the known technology in terms of purpose, means and effect, and it is the first invention that is practical and indeed meets the patent requirements for invention. We sincerely ask the review committee to examine it carefully and grant a patent as soon as possible to benefit the society. This is our utmost prayer.

111: LCD panel

113:LED driver circuit

10: Regional backlight control module

101: Backlight value extraction unit

1011: First extraction unit

1012: Second extraction unit

1013: Mapping unit

102: Filter unit

1021: First filter unit

1022: Second filter unit

103: PWM signal generation unit

104: Storage unit

105: Compensation unit

1051: Mixed light diffusion unit

1052: Pixel compensation unit

Claims (13)

A regional backlight control module is integrated into a backlight driver chip, wherein the backlight driver chip and a backlight unit are both included in a liquid crystal display, and the backlight unit includes X×Y backlight areas, where X and Y are both positive integers; the regional backlight control module includes: A backlight value extraction unit, which is used to divide an image corresponding to a display data into X×Y image blocks to respectively correspond to the X×Y backlight areas, and perform a partition feature value extraction operation, a regional backlight value calculation operation and a backlight value-drive value mapping operation on each of the image blocks, and output a corresponding drive data of each of the backlight areas; A filtering unit, coupled to the backlight value extraction unit, for performing a filtering process on the X×Y driving data, the filtering process includes a spatial filtering process and a temporal filtering process, and correspondingly outputs X×Y backlight driving data; and a PWM signal generating unit, coupled to the filtering unit, for correspondingly generating X×Y PWM signals according to the X×Y backlight driving data and transmitting them to an LED driving circuit of the backlight unit; The backlight value extraction unit includes: a first extraction unit, which is used to calculate an effective area of each backlight area according to the shape of a liquid crystal display panel of the liquid crystal display, and then give a label value to each effective area according to the size, and finally use the label value and the effective area to complete the partition feature value extraction operation, thereby obtaining X×Y partition feature values corresponding to the X×Y backlight areas; a second extraction unit, coupled to the first extraction unit, and used to extract the X×Y backlight areas according to the X×Y partition feature values. A backlight region performs a regional backlight value calculation operation to obtain X×Y regional backlight values corresponding to the X×Y backlight regions; and a mapping unit coupled to the second extraction unit and comprising at least one lookup table, the lookup table comprising a plurality of reference regional backlight values and a plurality of driving values respectively corresponding to the plurality of reference regional backlight values; wherein the mapping unit is used to search in the lookup table to obtain X×Y driving values respectively corresponding to the X×Y regional backlight values, thereby outputting the driving data of each backlight region. The regional backlight control module as described in claim 1, wherein the first extraction unit uses the following equations (1) to (5) to complete the regional feature value extraction operation: If S_area=1.0 S_normal, R_label=0 and =1.0 (P×Q)……………………(1); If 0.5 S_normal S_area 1.0 S_normal, R_label=1 and =0.75 (P×Q)…………(2); If 0.2 S_normal S_area 0.5 S_normal, R_label=2 and =0.35 (P×Q)…………(3); If 0.0 S_normal S_area 0.2 S_normal, R_label=3 and =0.1 (P×Q)…………(4); If S_area=0, R_label=7 and =1.0 (P×Q)…………(5); wherein S_area is the effective area, S_normal is a normal area of the image block, and R_label is the label value. is the partition feature value, and one of the image blocks contains P×Q pixels, where P and Q are both positive integers. The regional backlight control module as described in claim 2, wherein the second extraction unit uses the following formula (6) to complete the regional backlight value calculation operation: ……………………………(6); wherein avg is the regional backlight value, and sum is the sum of the grayscale values of the P×Q pixels. The regional backlight control module as described in claim 1, wherein the filter unit includes: a first filter unit, for performing a convolution operation on each of the driving data and a convolution kernel to complete the spatial filtering process, and then outputting a first driving data corresponding to the driving data; and a second filter unit, for performing the temporal filtering process on each of the first driving data, and then outputting a backlight driving data corresponding to the first driving data. A regional backlight control module as described in claim 4, wherein, before executing the spatial filtering process, the first filtering unit performs a boundary filling (padding) process on the driving data selected from the group consisting of K-neighbor calculation processing, zero filling processing, constant filling processing, mirror filling processing, and copy filling processing. The regional backlight control module as described in claim 4 further includes: A storage unit coupled between the second filter unit and the PWM signal generating unit, for receiving and storing the X×Y backlight driving data of the nth frame from the second filter unit, and transmitting the X×Y backlight driving data of the n-1th frame to the PWM signal generating unit; and A compensation unit coupled to the storage unit to receive the X×Y backlight driving data of the n-1th frame, and generating a frame of pixel compensation data according to the X×Y backlight driving data and transmitting it to at least one display driver chip of the liquid crystal display; Wherein, n is a positive integer. A backlight driver chip is applied to a liquid crystal display device including a backlight unit, and the backlight unit includes X×Y backlight areas, X and Y are both positive integers; its characteristic is that a regional backlight control module is integrated in the backlight driver chip, and the regional backlight control module includes: A backlight value extraction unit, which is used to divide an image corresponding to a display data into X×Y image blocks to respectively correspond to the X×Y backlight areas, and perform a partition feature value extraction operation, a regional backlight value calculation operation and a backlight value-drive value mapping operation on each of the image blocks, and output a corresponding drive data of each of the backlight areas; A filtering unit, coupled to the backlight value extraction unit, for performing a filtering process on the X×Y driving data, the filtering process includes a spatial filtering process and a temporal filtering process, and correspondingly outputs X×Y backlight driving data; and a PWM signal generating unit, coupled to the filtering unit, for correspondingly generating X×Y PWM signals according to the X×Y backlight driving data and transmitting them to an LED driving circuit of the backlight unit; The backlight value extraction unit includes: a first extraction unit, which is used to calculate an effective area of each backlight area according to the shape of a liquid crystal display panel of the liquid crystal display device, and then give a label value (label) to each effective area according to the size, and finally use the label value and the effective area to complete the partition feature value extraction operation, thereby obtaining X×Y partition feature values corresponding to the X×Y backlight areas; a second extraction unit, coupled to the first extraction unit, and used to extract the X×Y partition feature values according to the X×Y partition feature values. The backlight regions perform a regional backlight value calculation operation to obtain X×Y regional backlight values corresponding to the X×Y backlight regions; and a mapping unit coupled to the second extraction unit and comprising at least one lookup table, the lookup table comprising a plurality of reference regional backlight values and a plurality of driving values respectively corresponding to the plurality of reference regional backlight values; wherein the mapping unit is used to search in the lookup table to obtain X×Y driving values respectively corresponding to the X×Y regional backlight values, thereby outputting the driving data of each backlight region. The backlight driver chip as claimed in claim 7, wherein the first extraction unit uses the following equations (1) to (5) to complete the partition feature value extraction operation: If S_area=1.0 S_normal, R_label=0 and =1.0 (P×Q)……………………(1); If 0.5 S_normal S_area 1.0 S_normal, R_label=1 and =0.75 (P×Q)…………(2); If 0.2 S_normal S_area 0.5 S_normal, R_label=2 and =0.35 (P×Q)…………(3); If 0.0 S_normal S_area 0.2 S_normal, R_label=3 and =0.1 (P×Q)…………(4); If S_area=0, R_label=7 and =1.0 (P×Q)…………(5); wherein S_area is the effective area, S_normal is a normal area of the image block, and R_label is the label value. is the partition feature value, and one of the image blocks contains P×Q pixels, where P and Q are both positive integers. The backlight driver chip as described in claim 8, wherein the second extraction unit uses the following formula (6) to complete the regional backlight value calculation operation: ……………………………(6); wherein avg is the regional backlight value, and sum is the sum of the grayscale values of the P×Q pixels. The backlight driver chip as described in claim 7, wherein the filter unit includes: a first filter unit for performing a convolution operation on each of the drive data and a convolution kernel to complete the spatial filtering process, and then outputting a first drive data corresponding to the drive data; and a second filter unit for performing the temporal filtering process on each of the first drive data, and then outputting a backlight drive data corresponding to the first drive data. A backlight driver chip as described in claim 10, wherein, before performing the spatial filtering process, the first filtering unit performs a boundary filling (padding) process on the driving data selected from the group consisting of K-nearest neighbor calculation processing, zero filling processing, constant filling processing, mirror filling processing, and copy filling processing. The backlight driver chip as described in claim 10 further includes: A storage unit coupled between the second filter unit and the PWM signal generating unit, for receiving and storing the X×Y backlight driver data of the nth frame from the second filter unit, and transmitting the X×Y backlight driver data of the n-1th frame to the PWM signal generating unit; and A compensation unit coupled to the storage unit to receive the X×Y backlight driver data of the n-1th frame, and generating a frame of pixel compensation data according to the X×Y backlight driver data and transmitting it to at least one display driver chip of the liquid crystal display device; Wherein, n is a positive integer. An information processing device is characterized by having at least one backlight driver chip as described in any one of claim 7 to claim 12.

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