Partition backlight device based on semi-transparent and semi-reflective display and dimming method thereof

Abstract

The invention discloses a subarea backlight device based on semi-transmitting and semi-reflecting display, which comprises a subarea backlight plate, a semi-transmitting and semi-reflecting liquid crystal screen, an optical sensor array and a control circuit unit, and is characterized in that emergent light of each backlight subarea in the subarea backlight plate penetrates through a screen subarea corresponding to the semi-transmitting and semi-reflecting liquid crystal screen to form transmission light; each screen partition reflects ambient light in front of the screen to form reflected light; each backlight subarea in the subarea backlight plate is electrically connected with the control circuit unit, and the light sensor array collects the ambient light intensity in front of the screen and transmits the ambient light intensity to the control circuit unit; in the method, the control circuit unit controls the luminous intensity of each backlight subarea in the subarea backlight plate based on the screen front environment light intensity of each screen subarea and input image data, and performs pixel compensation on an input image. According to the invention, the luminous intensity of the backlight partition can be adaptively adjusted, and the display quality of an image is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display, and in particular to a partition backlight device based on semi-transmissive and semi-reflective display and a dimming method thereof. Background Art

[0002] At present, the partition backlight technology has been widely used in the field of liquid crystal display. The core of the partition backlight technology is to divide the traditional single-controlled backlight source into multiple independent areas. Each area can independently adjust the brightness according to the content of the picture, so as to achieve the purpose of improving the contrast of picture quality and reducing energy consumption. At present, the partition backlight technology is used in common transmissive LCD screens. In some application scenarios with complex ambient light intensity, the partition backlight technology based on transmissive LCD screens has limitations. For example, in the field of automotive displays, a long strip of screen may have a part under strong sunlight and a part in the shadow. The requirements for backlight brightness of the two display areas are obviously different.

[0003] Therefore, some people have proposed using a light sensor array to collect the ambient light intensity of the screen partitions, so as to adaptively adjust the brightness of the corresponding partition backlight to obtain a clearer display effect. Although this method can improve the display quality under complex ambient lighting, it requires the backlight brightness to be increased to a very high level under high-brightness ambient lighting, which has a great negative impact on energy consumption and heat dissipation.

[0004] Transflective liquid crystal display is one of the main means to solve the problem of strong light visibility. It can mainly rely on reflected light to achieve clear display in high-brightness ambient light, and can rely on backlight to provide display brightness in low-light conditions, overcoming the above limitations of transmissive liquid crystal display. However, at present, transflective liquid crystal display lacks corresponding partition backlight modulation algorithm, which cannot give full play to the advantages of transflective liquid crystal display in various complex lighting environments. Summary of the invention

[0005] The present invention provides a partitioned backlight device based on a semi-transmissive and semi-reflective display and a dimming method thereof, so as to solve the problem that the prior art lacks a semi-transmissive and semi-reflective liquid crystal display backlight modulation algorithm, thereby realizing that the semi-transmissive and semi-reflective display can adaptively modulate the brightness of each backlight partition under complex ambient lighting conditions, so as to make full use of the energy of reflected light, thereby reducing power consumption and improving display quality.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A partitioned backlight device based on semi-transmissive and semi-reflective display comprises a liquid crystal screen and a backlight panel thereof, wherein the backlight panel is a partitioned backlight panel (1) composed of a plurality of backlight partitions, the liquid crystal screen is a semi-transmissive and semi-reflective liquid crystal screen (2), the luminous intensity of each backlight partition in the partitioned backlight panel (1) is controllable, the area of ​​each backlight partition of the partitioned backlight panel (1) corresponding to the semi-transmissive and semi-reflective liquid crystal screen (2) respectively forms a screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2), the emitted light of each backlight partition in the partitioned backlight panel (1) is transmitted through the screen partition corresponding to the semi-transmissive and semi-reflective liquid crystal screen (2) to form transmitted light, and each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2) reflects the ambient light in front of the screen to form reflected light;

[0008] It also comprises a light sensor array (3) and a control circuit unit (4), wherein the light sensor array (3) collects the ambient light intensity in front of the semi-transmissive and semi-reflective liquid crystal screen (2), the light sensor array (3) is electrically connected to the control circuit unit (4), and the control circuit unit (4) is also electrically connected to each backlight partition in the partition backlight panel (1);

[0009] The light sensor array (3) transmits the collected ambient light intensity in front of the screen to the control circuit unit (4), whereby the control circuit unit (4) obtains the ambient light intensity in front of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2), and the control circuit unit (4) also obtains input image data of the semi-transmissive and semi-reflective liquid crystal screen (2). Based on the ambient light intensity in front of each screen partition and the input image data, the control circuit unit (4) performs real-time control on the luminous intensity of each backlight partition in the partitioned backlight panel (1), and performs pixel compensation on the input image.

[0010] Furthermore, the light sensor array (3) is composed of a plurality of light sensors, which are respectively distributed in front of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2). The light sensor array (3) directly collects the screen ambient light intensity in front of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2), and transmits it to the control circuit unit (4), thereby the control circuit unit (4) obtains the screen ambient light intensity in front of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2).

[0011] Furthermore, the light sensor array (3) is composed of a plurality of light sensors, each of which is distributed around the front of the semi-transmissive and semi-reflective liquid crystal screen (2). The light sensor array (3) collects the screen front ambient light intensity around the entire semi-transmissive and semi-reflective liquid crystal screen (2) and transmits it to the control circuit unit (4). The control circuit unit (4) indirectly obtains the screen front ambient light intensity of each screen partition through calculation.

[0012] A dimming method for the above-mentioned partition backlight device based on semi-transmissive and semi-reflective display comprises the following steps:

[0013] Step 1, obtaining the ambient light intensity in front of each screen partition of the transflective liquid crystal screen (2) and the input image data of the transflective liquid crystal screen (2);

[0014] Step 2: Calculate the reflected light intensity of each screen partition according to the ambient light intensity in front of each screen partition;

[0015] Step 3: modulate the luminous brightness of each backlight partition in the partitioned backlight panel (1) according to the reflected light intensity of each screen partition and the maximum transmitted light intensity of the semi-transmissive and semi-reflective liquid crystal screen (2), and perform pixel compensation on the image data of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2).

[0016] Furthermore, in step 2, the calculation formula for the reflected light intensity of each screen partition of the transflective liquid crystal screen (2) is as follows:

[0017]

[0018] Where: L re (m,n) represents the reflected light intensity of the screen partition with coordinates (m,n) in the original image; I(m,n) represents the grayscale value of the screen partition with coordinates (m,n) in the original image, which is obtained by statistical analysis of the grayscale values ​​of all pixels in the corresponding screen partition; γ represents the gamma value of the LCD screen; L am (m,n) represents the ambient light intensity in front of the screen partition with coordinates (m,n); re represents the reflectivity of the semi-transmissive and semi-reflective LCD screen.

[0019] Further, the process of step 3 is as follows:

[0020] Comparing the reflected light intensity of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2) with the highest transmitted light intensity of the semi-transmissive and semi-reflective liquid crystal screen (2);

[0021] When the comparison result is that the reflected light intensity of the screen partition with coordinates (m, n) is greater than or equal to the highest transmitted light intensity, the brightness of the backlight partition corresponding to the screen partition with coordinates (m, n) is set to 0, and the pixel value in the screen partition with coordinates (m, n) is compensated using the following formula:

[0022]

[0023] Where: I'(x,y) represents the compensated pixel value of the pixel with coordinates (x,y) in the screen partition with coordinates (m,n); I(x,y) represents the original pixel value with coordinates (x,y) in the screen partition with coordinates (m,n); L H Represents the highest transmitted light intensity of the transflective LCD screen;

[0024] When the comparison result is the reflected light intensity L of the screen partition with coordinates (m, n)re If (m,n) is less than the maximum transmitted light intensity, an iterative method is used to perform pixel compensation and brightness modulation of the corresponding backlight partition.

[0025] Furthermore, the iterative process is as follows:

[0026] Step 3.1) If I(m,n) is less than 255, set I(m,n) = I(m,n) + 1, recalculate the reflected light intensity using the following formula and go to step 3.2):

[0027] L′ re (m,n)=(I(m,n) / 255) γ ×L am ×

[0028] Otherwise, go to step 3.4);

[0029] Step 3.2) If L' re (m,n) is less than the maximum transmitted light intensity and I(m,n) is less than or equal to 255, then repeat step 3.1);

[0030] Otherwise, go to step 3.3).

[0031] Step 3.3) Compensate the pixel values ​​in the screen partition with coordinates (m, n) using the following formula:

[0032]

[0033] At the same time, the backlight brightness of the screen partition with coordinates (m,n) is set to 0.

[0034] Step 3.4) Use the following formula to compensate the pixel value in the screen partition with coordinates (m, n):

[0035]

[0036] At the same time, the luminous brightness of the backlight partition corresponding to the screen partition with coordinates (m, n) is set to be as shown in the following formula:

[0037] L B (m,n)=(L H -L′ re (m,n))÷tr

[0038] Where tr represents the transmittance of the semi-transmissive and semi-reflective LCD screen.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] The beneficial technical effects of the present invention are embodied in:

[0041] 1. The device of the present invention collects the ambient light intensity in front of each screen partition in real time through the light sensor array, and can adaptively adjust the luminous intensity of the backlight partition in a complex lighting environment, making full use of the energy of the ambient light to reduce the backlight power consumption. Its advantages are particularly prominent in high-brightness ambient light scenes;

[0042] 2. The dimming algorithm proposed in the present invention determines the relationship between the reflected light intensity and the maximum transmitted light intensity of each screen partition of the semi-transmissive and semi-reflective LCD screen, modulates the luminous brightness of the backlight partition corresponding to each screen partition, and performs corresponding pixel compensation on the image data of each screen partition. It can maintain the uniformity of the display brightness of each screen partition of the screen under the premise of maximizing the use of ambient light energy, thereby ensuring the display quality of the image. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic structural diagram of a partitioned backlight device based on a semi-transmissive and semi-reflective display according to an embodiment of the present invention.

[0044] Figure 2 It is a flow chart of the dimming method according to an embodiment of the present invention.

[0045] Figure 3 It is a flow chart of the backlight modulation and pixel compensation algorithm in the dimming method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0047] like Figure 1 As shown, this embodiment discloses a partitioned backlight device based on semi-transmissive and semi-reflective display, including a partitioned backlight panel 1, a semi-transmissive and semi-reflective liquid crystal screen 2, a light sensor array 3, and a control circuit unit 4. Among them:

[0048] The partitioned backlight panel 1 is composed of a plurality of backlight partitions, each of which is composed of a plurality of light-emitting elements, and the light-emitting intensity of each backlight partition can be independently controlled.

[0049] The semi-transmissive and semi-reflective liquid crystal screen 2 transmits the outgoing light of the partitioned backlight panel 1, and the semi-transmissive and semi-reflective liquid crystal screen 2 reflects the ambient light in front of the screen.

[0050] The partitioned backlight panel 1 is arranged on the back of the semi-transmissive and semi-reflective liquid crystal screen 2, so that the area of ​​each backlight partition of the partitioned backlight panel 1 corresponding to the semi-transmissive and semi-reflective liquid crystal screen 2 respectively forms a screen partition of the semi-transmissive and semi-reflective liquid crystal screen 2. The emitted light of each backlight partition in the partitioned backlight panel 1 is transmitted through the screen partition corresponding to the semi-transmissive and semi-reflective liquid crystal screen 2 to form transmitted light, and each screen partition of the semi-transmissive and semi-reflective liquid crystal screen 2 reflects the ambient light in front of the screen to form reflected light.

[0051] The light sensor array 3 is composed of a plurality of light sensors, each of which is electrically connected to the control circuit unit 4 for signal transmission. In the light sensor array 3, a plurality of light sensors are respectively distributed in front of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen 2, and each light sensor in the light sensor array 3 directly collects the screen front ambient light intensity of the corresponding screen partition of the semi-transmissive and semi-reflective liquid crystal screen 2, and transmits it to the control circuit unit 4, thereby the control circuit unit 4 directly obtains the screen front ambient light intensity of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen 2.

[0052] Alternatively, in the light sensor array 3, each light sensor is distributed around the front of the semi-transmissive and semi-reflective liquid crystal screen 2. Each light sensor in the light sensor array 3 collects the ambient light intensity in front of the screen around the semi-transmissive and semi-reflective liquid crystal screen 2 as a whole and transmits it to the control circuit unit 4. The control circuit unit 4 indirectly obtains the ambient light intensity in front of the screen of each screen partition through calculation.

[0053] The control circuit unit 4 is also electrically connected to each backlight partition in the partition backlight panel 1, and the control circuit unit 4 also obtains the input image data of the semi-transmissive and semi-reflective liquid crystal screen 2. The control circuit unit 4 controls the luminous intensity of the backlight partition in the partition backlight panel 1 corresponding to each screen partition in real time based on the front-screen ambient light intensity of each screen partition and the characteristics of the input image, and the control circuit unit 4 performs pixel compensation on the input image to achieve the purpose of making full use of the ambient light intensity to reduce the backlight luminous intensity, while maintaining the uniformity of the display brightness of the semi-transmissive and semi-reflective display under various ambient lighting conditions.

[0054] like Figure 2 As shown, this embodiment also discloses a dimming method of the above-mentioned partition backlight device based on semi-transmissive and semi-reflective display, comprising the following steps:

[0055] Step 1, the control circuit unit 4 directly or indirectly obtains the screen ambient light intensity in front of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen 2, and the control circuit unit 4 obtains the input image data of the semi-transmissive and semi-reflective liquid crystal screen 2.

[0056] Step 2, the control circuit unit 4 calculates the reflected light intensity of each screen partition according to the ambient light intensity in front of each screen partition of the transflective liquid crystal screen 2, and the calculation formula is as follows:

[0057]

[0058] Where: L re (m,n) represents the reflected light intensity of the screen partition with coordinates (m,n) in the original image; I(m,n) represents the grayscale value of the screen partition with coordinates (m,n) in the original image, which is obtained by statistical analysis of the grayscale values ​​of all pixels in the corresponding screen partition extracted by the existing backlight extraction algorithm; γ represents the gamma value of the LCD screen; L am(m,n) represents the ambient light intensity in front of the screen partition with coordinates (m,n); re represents the reflectivity of the semi-transmissive and semi-reflective LCD screen.

[0059] Step 3: According to the reflected light intensity of each screen partition and the highest transmitted light intensity of the semi-transmissive and semi-reflective liquid crystal screen 2, the luminous brightness of each backlight partition in the partition backlight panel 1 is modulated, and pixel compensation is performed on the image data of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen 2. The highest transmitted light intensity of the semi-transmissive and semi-reflective liquid crystal screen 2 refers to the screen transmitted light intensity of the semi-transmissive and semi-reflective liquid crystal screen 2 when the backlight brightness is the maximum and the image pixel grayscale value is the maximum. Figure 3 As shown, the specific process is as follows:

[0060] The reflected light intensity of each screen partition of the transflective liquid crystal screen 2 calculated in step 2 is compared with the highest transmitted light intensity of the transflective liquid crystal screen 2;

[0061] When the comparison result is that the reflected light intensity of the screen partition with coordinates (m, n) is greater than or equal to the highest transmitted light intensity, the brightness of the backlight partition corresponding to the screen partition with coordinates (m, n) is set to 0, and the pixel value in the screen partition with coordinates (m, n) is compensated using the following formula:

[0062]

[0063] Where: I'(x,y) represents the compensated pixel value of the pixel with coordinates (x,y) in the screen partition with coordinates (m,n); I(x,y) represents the original pixel value with coordinates (x,y) in the screen partition with coordinates (m,n); L H Represents the highest transmitted light intensity of the transflective LCD screen;

[0064] When the comparison result is the reflected light intensity L of the screen partition with coordinates (m, n) re If (m,n) is less than the maximum transmitted light intensity, the iterative method is used to perform pixel compensation and brightness modulation of the corresponding backlight partition. The iterative method process is as follows:

[0065] Step 3.1) If I(m,n) is less than 255, set I(m,n) = I(m,n) + 1, recalculate the reflected light intensity using the following formula and go to step 3.2):

[0066] L′ re (m,n)=(I(m,n) / 255) γ ×L am ×

[0067] Otherwise, go to step 3.4);

[0068] Step 3.2) If L' re(m,n) is less than the maximum transmitted light intensity and I(m,n) is less than or equal to 255, then repeat step 3.1);

[0069] Otherwise, go to step 3.3).

[0070] Step 3.3) Compensate the pixel values ​​in the screen partition with coordinates (m, n) using the following formula:

[0071]

[0072] At the same time, the backlight brightness of the screen partition with coordinates (m,n) is set to 0.

[0073] Step 3.4) Use the following formula to compensate the pixel value in the screen partition with coordinates (m, n):

[0074]

[0075] At the same time, the luminous brightness of the backlight partition corresponding to the screen partition with coordinates (m, n) is set to be as shown in the following formula:

[0076] L B (m,n)=(L H -L′ re (m,n))÷tr

[0077] Where tr represents the transmittance of the semi-transmissive and semi-reflective LCD screen.

[0078] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. The embodiments described in the present invention are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction, and such combinations should also be regarded as the contents disclosed in the present disclosure as long as they do not violate the concept of the present invention. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0079] The present invention is not limited to the specific details of the above-mentioned embodiments. Within the technical concept of the present invention and without departing from the design concept of the present invention, various modifications and improvements made to the technical solution of the present invention by technical personnel in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A partitioned backlight device based on semi-transmissive and semi-reflective display, comprising a liquid crystal screen and a backlight panel thereof, characterized in that: The backlight panel is a partitioned backlight panel (1) composed of a plurality of backlight partitions, the liquid crystal screen is a semi-transmissive and semi-reflective liquid crystal screen (2), the luminous intensity of each backlight partition in the partitioned backlight panel (1) is controllable, the area of ​​each backlight partition of the partitioned backlight panel (1) corresponding to the semi-transmissive and semi-reflective liquid crystal screen (2) respectively forms a screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2), the emitted light of each backlight partition in the partitioned backlight panel (1) is transmitted through the screen partition corresponding to the semi-transmissive and semi-reflective liquid crystal screen (2) to form transmitted light, and each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2) reflects the ambient light in front of the screen to form reflected light; It also comprises a light sensor array (3) and a control circuit unit (4), wherein the light sensor array (3) collects the ambient light intensity in front of the semi-transmissive and semi-reflective liquid crystal screen (2), the light sensor array (3) is electrically connected to the control circuit unit (4), and the control circuit unit (4) is also electrically connected to each backlight partition in the partition backlight panel (1); The light sensor array (3) transmits the collected ambient light intensity in front of the screen to the control circuit unit (4), whereby the control circuit unit (4) obtains the ambient light intensity in front of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2), and the control circuit unit (4) also obtains input image data of the semi-transmissive and semi-reflective liquid crystal screen (2). Based on the ambient light intensity in front of each screen partition and the input image data, the control circuit unit (4) performs real-time control on the luminous intensity of each backlight partition in the partitioned backlight panel (1), and performs pixel compensation on the input image.

2. The partitioned backlight device based on semi-transmissive and semi-reflective display according to claim 1, characterized in that: The light sensor array (3) is composed of a plurality of light sensors, which are respectively distributed in front of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2). The light sensor array (3) directly collects the screen ambient light intensity in front of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2) and transmits it to the control circuit unit (4), thereby the control circuit unit (4) obtains the screen ambient light intensity in front of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2).

3. The partitioned backlight device based on semi-transmissive and semi-reflective display according to claim 1, characterized in that: The light sensor array (3) is composed of a plurality of light sensors, each of which is distributed around the front of the semi-transmissive and semi-reflective liquid crystal screen (2). The light sensor array (3) collects the screen front ambient light intensity around the entire semi-transmissive and semi-reflective liquid crystal screen (2) and transmits it to the control circuit unit (4). The control circuit unit (4) indirectly obtains the screen front ambient light intensity of each screen partition through calculation.

4. A dimming method for a partitioned backlight device based on a semi-transmissive and semi-reflective display as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1, obtaining the ambient light intensity in front of each screen partition of the transflective liquid crystal screen (2) and the input image data of the transflective liquid crystal screen (2); Step 2: Calculate the reflected light intensity of each screen partition according to the ambient light intensity in front of each screen partition; Step 3: modulate the luminous brightness of each backlight partition in the partitioned backlight panel (1) according to the reflected light intensity of each screen partition and the maximum transmitted light intensity of the semi-transmissive and semi-reflective liquid crystal screen (2), and perform pixel compensation on the image data of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2).

5. The dimming method of a partitioned backlight device based on a semi-transmissive and semi-reflective display according to claim 4, characterized in that: In step 2, the calculation formula for the reflected light intensity of each screen partition of the transflective liquid crystal screen (2) is as follows: Where: L re (m,n) represents the reflected light intensity of the screen partition with coordinates (m,n) in the original image; I(m,n) represents the grayscale value of the screen partition with coordinates (m,n) in the original image, which is obtained by statistical analysis of the grayscale values ​​of all pixels in the corresponding screen partition; γ represents the gamma value of the LCD screen; L am (m,n) represents the ambient light intensity in front of the screen partition with coordinates (m,n); re represents the reflectivity of the semi-transmissive and semi-reflective LCD screen.

6. The dimming method of a partitioned backlight device based on a semi-transmissive and semi-reflective display according to claim 4, characterized in that: Step 3 process is as follows: Comparing the reflected light intensity of each screen partition of the semi-transmissive and semi-reflective liquid crystal screen (2) with the highest transmitted light intensity of the semi-transmissive and semi-reflective liquid crystal screen (2); When the comparison result is that the reflected light intensity of the screen partition with coordinates (m, n) is greater than or equal to the highest transmitted light intensity, the brightness of the backlight partition corresponding to the screen partition with coordinates (m, n) is set to 0, and the pixel value in the screen partition with coordinates (m, n) is compensated using the following formula: Where: I'(x,y) represents the compensated pixel value of the pixel with coordinates (x,y) in the screen partition with coordinates (m,n); I(x,y) represents the original pixel value with coordinates (x,y) in the screen partition with coordinates (m,n); L H Represents the highest transmitted light intensity of the transflective LCD screen; When the comparison result is the reflected light intensity L of the screen partition with coordinates (m, n) re If (m,n) is less than the maximum transmitted light intensity, an iterative method is used to perform pixel compensation and brightness modulation of the corresponding backlight partition.

7. The dimming method of a partitioned backlight device based on a semi-transmissive and semi-reflective display according to claim 6, characterized in that: The iterative process is as follows: Step 3.1) If I(m,n) is less than 255, set I(m,n) = I(m,n) + 1, recalculate the reflected light intensity using the following formula and go to step 3.2): L′ re (m,n)=(I(m,n) / 255) γ ×L am ×re Otherwise, go to step 3.4); Step 3.2) If L' re (m,n) is less than the maximum transmitted light intensity and I(m,n) is less than or equal to 255, then repeat step 3.1); Otherwise, go to step 3.3). Step 3.3) Compensate the pixel values ​​in the screen partition with coordinates (m, n) using the following formula: At the same time, the backlight brightness of the screen partition with coordinates (m,n) is set to 0. Step 3.4) Use the following formula to compensate the pixel value in the screen partition with coordinates (m, n): At the same time, the luminous brightness of the backlight partition corresponding to the screen partition with coordinates (m, n) is set to be as shown in the following formula: L B (m,n)=(L H -L′ re (m,n))÷tr Where tr represents the transmittance of the semi-transmissive and semi-reflective LCD screen.

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