Light field display method and system based on LED staggered lighting

Abstract

The invention discloses a light field display method and system based on LED staggered lighting, and belongs to the technical field of light field display, and the method comprises the following steps: S1, segmenting 3D display content into multi-view image frames; s2, setting a staggered lightening mode of the LED array module according to the multi-view image frame; and S3, mapping coded image data to pixels of the LCD display module through the control circuit module by using a light field coding method according to the interlaced lightening mode to complete display of a composite image. According to the invention, continuous, low-crosstalk and large-depth light field display can be realized in a large visual angle range of more than 150 degrees.

Description

Technical Field

[0001] The present invention belongs to the technical field of light field display, and in particular relates to a light field display method and system based on staggered lighting of LEDs. Background Art

[0002] In the field of light field display technology, as people's demand for high-quality visual experience continues to increase, how to achieve light field display with large viewing angle, low crosstalk and large depth has become a research hotspot. Traditional light field display technology has certain limitations in terms of viewing angle range, display depth and crosstalk control. The traditional structure uses cylindrical lens grating or lens array to achieve three-dimensional light field display. Single-layer cylindrical lens grating has large distortion at the edge of its field of view. In order to ensure the viewing effect, the viewing angle of the light field display using a single-layer grating is usually less than or equal to 55°, and there is a jump phenomenon between adjacent viewing areas. The use of composite gratings can reduce distortion to a certain extent, but its light efficiency is low. The viewing angle of a three-dimensional light field display using a composite grating is usually less than or equal to 110°, and there is also a jump phenomenon between adjacent viewing areas. The existence of multiple viewing areas leads to incorrect geometric relationships observed by viewers in non-central viewing areas. For applications such as medicine and military that require accurate reproduction of three-dimensional scenes, this defect is unacceptable.

[0003] LED has the advantages of self-luminescence, high brightness, and high contrast, but in light field display applications, how to cooperate with other components to achieve the ideal display effect still needs further exploration. Therefore, it is of great significance to develop a new light field display device and method. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a light field display method and system based on staggered lighting of LEDs, which solves the problem of limited viewing angle of traditional display technology and successfully increases the viewing angle of the light field display system to more than 150°. It avoids the occurrence of jump phenomenon and solves the problem of incorrect geometric relationship observed by viewers in non-central viewing areas.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is: a light field display method based on staggered lighting of LEDs, comprising the following steps: S1, dividing the 3D display content into multi-view image frames; S2, setting a staggered lighting mode of the LED array module according to the multi-view image frame; S3. Using the light field coding method according to the staggered lighting mode, the coded image data is mapped to the pixels of the LCD display module through the control circuit module to complete the display of the synthesized image.

[0006] Further: In S2, based on the multi-view image frame, the viewing angle is adjusted by adjusting the number of intervals of the lit LED units in a staggered lighting mode, wherein the viewing angle The specific expression is:

[0007] In the formula, p is the LED unit size, d is the LED unit spacing, l is the distance between the LED unit and the filter in the LCD display module, n is the number of interval LED units.

[0008] Further: In S3, the expression of the light field encoding method is specifically: Determining the number of viewpoints for a light field display based on staggered LED lighting After that, The interval is divided into subintervals, the width of the subinterval is The disparity map information that the sub-pixel needs to fill is based on the distance from the sub-pixel to the left side of the area illuminated by the leftmost LED unit. D p The distance from the sub-pixel to the left side of the illuminated area of ​​the corresponding LED unit below it A p The specific expression is:

[0009]

[0010]

[0011]

[0012]

[0013] In the formula, N is the number of viewpoints, For the i Line j Pixel in column k sub-pixels, P h is the number of horizontal lines, P v is the number of vertical lines, D p is the distance from a sub-pixel to the left side of the illuminated area of ​​the leftmost LED unit. A p The left distance from the sub-pixel to the illuminated area of ​​the corresponding LED unit below it. dis the subinterval width, To round down, n is the viewpoint number without offset, It is the viewpoint number after adding the offset according to the LED lighting situation, and % is the remainder calculation.

[0014] A light field display system based on staggered lighting of LEDs, comprising: LED array module, serving as the backlight source for light field display; An LCD display module, used for displaying the encoded composite image; The control circuit module is provided with a brightness sensor and has a programmable control function, and is used to control the lighting mode of the LED array module, the brightness of the LED array, and the display content of the LCD display module; The light field coding algorithm module is used to calculate the viewpoint matrix and fill the sub-pixels at the same position of the corresponding parallax image into the synthetic image to complete the light field coding.

[0015] Furthermore: the LED unit size of the LED array module is less than 0.8 mm, and the unit spacing is less than 0.8 mm.

[0016] Furthermore: the LCD display module is installed in front of the LED array module, the distance between the LCD display module and the LED array module is less than 2mm, the size of the LCD liquid crystal layer is not less than 24 inches, and the resolution is not less than 2560*1440.

[0017] Furthermore: a microlens array is arranged between the LED array module and the LCD display module.

[0018] The beneficial effects of the present invention are as follows: the present invention provides a light field display method and system based on staggered lighting of LEDs, which has the following advantages over the prior art: (1) Improved wide-angle light field display effect Through the staggered lighting mode of the LED array, the emission direction and range of the light are precisely controlled. The light field encoding algorithm accurately maps the multi-view image data to the LCD pixels according to the lighting mode of the LED array, and realizes continuous, low crosstalk, and deep light field display within a wide viewing angle range of 150°+. This combination effectively solves the problem of limited viewing angle of traditional display technology, avoids the occurrence of jump phenomenon, and solves the problem of incorrect geometric relationship observed by viewers in non-central viewing areas, greatly improving the user's visual experience when watching at a wide viewing angle, especially suitable for scenes where multiple people watch at the same time, such as medical consultations, large-scale exhibitions, and home theaters shared by multiple people.

[0019] (2) Device design and manufacturing cost optimization The flexible requirements of LED array modules for unit size and spacing, as well as the optional range of distance between LCD display modules and LED array modules, their own size and resolution, give the device design and manufacturing more options. Manufacturers do not have to be limited to specific high-precision, high-cost components, and can flexibly match them according to actual application requirements and cost budgets. For example, in some scenarios that do not require extremely high display effects but are cost-sensitive, components with relatively low parameters can be selected, which reduces material costs and manufacturing difficulties, improves production efficiency, and makes the light field display device more competitive in the market, which helps its large-scale promotion and application.

[0020] (3) Ambient light adaptive display optimization The programmable control function of the control circuit module is the key to achieving ambient light adaptive display. When the lighting conditions change, the module can quickly obtain ambient light information and adjust the brightness and lighting mode of the LED array according to the preset program. This real-time adjustment ensures that the display content can be presented to the user with the best brightness and contrast under different lighting environments, improving the practicality and user-friendliness of the display device, and can be widely used in various indoor and outdoor places with different lighting environments.

[0021] In summary, the present invention provides a light field display method and system based on staggered lighting of LEDs, which can achieve continuous, low crosstalk, and large-depth light field display within a wide viewing angle range of more than 150°. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a flow chart of a light field display method based on staggered lighting of LEDs.

[0023] Figure 2 Schematic diagram of viewpoint numbering and viewpoint number matrix of the present invention.

[0024] Figure 3 The diagram is a schematic diagram of a light field display system based on staggered lighting of LEDs according to the present invention.

[0025] Figure 4 This is a schematic diagram of staggered lighting of LEDs of the present invention. DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0027] like Figure 1As shown, in one embodiment of the present invention, a light field display method based on staggered lighting of LEDs includes the following steps: S1, dividing the 3D display content into multi-view image frames; S2, setting a staggered lighting mode of the LED array module according to the multi-view image frame; S3. Using the light field coding method according to the staggered lighting mode, the coded image data is mapped to the pixels of the LCD display module through the control circuit module to complete the display of the synthesized image.

[0028] In this embodiment, a continuous, low-crosstalk, and deep-depth light field display is provided within a wide viewing angle range of 150°+ through staggered lighting of the LED array and a composite image displayed by the LCD display module.

[0029] In S2, based on the multi-view image frame, the viewing angle is adjusted by adjusting the number of intervals of the lit LED units in a staggered lighting mode, wherein the viewing angle The specific expression is:

[0030] In the formula, p is the LED unit size, d is the LED unit spacing, l is the distance between the LED unit and the filter in the LCD display module, n is the number of interval LED units.

[0031] In S3, the expression of the light field encoding method is specifically: Determining the number of viewpoints for a light field display based on staggered LED lighting After that, The interval is divided into subintervals, the width of the subinterval is The disparity map information that the sub-pixel needs to fill is based on the distance from the sub-pixel to the left side of the area illuminated by the leftmost LED unit. D p The distance from the sub-pixel to the left side of the illuminated area of ​​the corresponding LED unit below it A p The specific expression is:

[0032]

[0033]

[0034]

[0035]

[0036] In the formula, N is the number of viewpoints, For the i Line j Pixel in column k sub-pixels, P h is the number of horizontal lines, P v is the number of vertical lines, D p is the distance from a sub-pixel to the left side of the illuminated area of ​​the leftmost LED unit. A p The left side distance from the sub-pixel to the illuminated area of ​​the corresponding LED unit below it. d is the subinterval width, To round down, n is the viewpoint number without offset, It is the viewpoint number after adding the offset according to the LED lighting situation, and % is the remainder calculation.

[0037] The mapping relationship between the sub-pixels in the synthetic image and the sub-pixels in the disparity image is determined by the above formula, and then the viewpoint number matrix is ​​determined, such as Figure 2 As shown in the figure, the number on the sub-pixel in the LCD display module represents the information of which disparity map the sub-pixel should be filled with; the right side is the viewpoint matrix. The viewpoint matrix records which disparity map each sub-pixel in the LCD display module should load, and is essentially a data structure. After calculating the disparity map information that needs to be filled in each sub-pixel, that is, obtaining the viewpoint number, the complete viewpoint matrix can be obtained. According to this viewpoint matrix, the disparity map information is filled into the corresponding sub-pixel to complete the light field encoding.

[0038] In this embodiment, the LED array module adopts a Micro-LED array or a Mini-LED array.

[0039] like Figure 3 As shown, in this embodiment, a light field display system based on staggered lighting of LEDs includes: LED array module, serving as the backlight source for light field display; An LCD display module, used for displaying the encoded composite image; The control circuit module is provided with a brightness sensor and has a programmable control function, and is used to control the lighting mode of the LED array module, the brightness of the LED array, and the display content of the LCD display module; The light field coding algorithm module is used to calculate the viewpoint matrix and fill the sub-pixels at the same position of the corresponding parallax image into the synthetic image to complete the light field coding.

[0040] The LED unit size of the LED array module is less than 0.8 mm, and the unit spacing is less than 0.8 mm.

[0041] like Figure 4 As shown, in this embodiment, the LED array module is used as a backlight source for light field display, and adopts a staggered lighting method. For example, the lighting rule of staggered lighting method 1 is: starting from the upper left corner, the odd-numbered rows first light up the first LED unit, and then light up the second LED unit every 3 LED units, and so on; the even-numbered rows first light up the third LED unit, and then light up the second LED unit every 3 LED units. For example, the lighting rule of staggered lighting method 2 is: taking the first three rows as an example, take the first two LED units in each row, the two LED units in the first row are marked as A and B; the two LED units in the second row are marked as C and D; the LED units in the third row are marked as E and F. C is located on the perpendicular bisector of the AB line, C and D are located on the perpendicular bisector of AE, and B and F are located on the perpendicular bisector of CD. The lighting methods that meet the above geometric relationships are all regarded as the staggered lighting mentioned in the present invention.

[0042] The LCD display module is installed in front of the LED array module. The distance between the LCD display module and the LED array module is less than 2 mm. The size of the LCD liquid crystal layer is not less than 24 inches, and the resolution is not less than 2560*1440.

[0043] A microlens array is arranged between the LED array module and the LCD display module to further optimize the directionality of light, so as to further enhance the display depth and reduce crosstalk between viewpoints.

[0044] The beneficial effects of the present invention are as follows: the present invention provides a light field display method and system based on staggered lighting of LEDs, which has the following advantages over the prior art: (1) Improved wide-angle light field display effect Through the staggered lighting mode of the LED array, the emission direction and range of the light are precisely controlled. The light field encoding algorithm accurately maps the multi-view image data to the LCD pixels according to the lighting mode of the LED array, and realizes continuous, low crosstalk, and deep light field display within a wide viewing angle range of 150°+. This combination effectively solves the problem of limited viewing angle of traditional display technology, avoids the occurrence of jump phenomenon, and solves the problem of incorrect geometric relationship observed by viewers in non-central viewing areas, greatly improving the user's visual experience when watching at a wide viewing angle, especially suitable for scenes where multiple people watch at the same time, such as medical consultations, large-scale exhibitions, and home theaters shared by multiple people.

[0045] (2) Device design and manufacturing cost optimization The flexible requirements of LED array modules for unit size and spacing, as well as the optional range of distance between LCD display modules and LED array modules, their own size and resolution, give the device design and manufacturing more options. Manufacturers do not have to be limited to specific high-precision, high-cost components, and can flexibly match them according to actual application requirements and cost budgets. For example, in some scenarios that do not require extremely high display effects but are cost-sensitive, components with relatively low parameters can be selected, which reduces material costs and manufacturing difficulties, improves production efficiency, and makes the light field display device more competitive in the market, which helps its large-scale promotion and application.

[0046] (3) Ambient light adaptive display optimization The programmable control function of the control circuit module is the key to achieving ambient light adaptive display. When the lighting conditions change, it can quickly obtain ambient light information and adjust the brightness of the LED array according to the preset program. This real-time adjustment ensures that the display content can be presented to the user with the best brightness and contrast under different lighting environments, improving the practicality and user-friendliness of the display device, and can be widely used in various indoor and outdoor places with different lighting environments.

[0047] In summary, the present invention provides a light field display method and system based on staggered lighting of LEDs, which can achieve continuous, low crosstalk, and large-depth light field display within a wide viewing angle range of more than 150°.

[0048] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "radial", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used only for descriptive purposes, and cannot be understood as indicating or implying the relative importance or the number of implicitly specified technical features. Therefore, the features defined by "first", "second", and "third" may explicitly or implicitly include one or more of the features.

Claims

1. A light field display method based on staggered lighting of LEDs, characterized in that: The following steps are involved: S1, dividing the 3D display content into multi-view image frames; S2, setting a staggered lighting mode of the LED array module according to the multi-view image frame; S3, using a light field coding method according to the staggered lighting mode, mapping the coded image data to pixels of the LCD display module through the control circuit module, and completing the display of the synthesized image; In S3, the expression of the light field encoding method is specifically: Determining the number of viewpoints for a light field display based on staggered LED lighting After that, The interval is divided into subintervals, the width of the subinterval is The disparity map information that the sub-pixel needs to fill is based on the distance from the sub-pixel to the left side of the area illuminated by the leftmost LED unit. D p The distance from the sub-pixel to the left side of the illuminated area of ​​the corresponding LED unit below it A p The specific expression is: In the formula, N is the number of viewpoints, For the i Line j Pixel in column k sub-pixels, P h is the number of horizontal lines, P v is the number of vertical lines, D p is the distance from a sub-pixel to the left side of the illuminated area of ​​the leftmost LED unit. A p The left side distance from the sub-pixel to the illuminated area of ​​the corresponding LED unit below it. d is the subinterval width, To round down, n is the viewpoint number without offset, It is the viewpoint number after adding the offset according to the LED lighting situation, and % is the remainder calculation.

2. The light field display method based on staggered lighting of LEDs according to claim 1, characterized in that: In S2, based on the multi-view image frame, the viewing angle is adjusted by adjusting the number of intervals of the lit LED units in a staggered lighting mode, wherein the viewing angle The specific expression is: In the formula, p is the LED unit size, d is the LED unit spacing, l is the distance between the LED unit and the filter in the LCD display module, n is the number of interval LED units.

3. A light field display system based on staggered lighting of LEDs, applied to the light field display method based on staggered lighting of LEDs as claimed in any one of claims 1 to 2, characterized in that: The system includes: LED array module, serving as the backlight source for light field display; An LCD display module, used for displaying the encoded composite image; The control circuit module is provided with a brightness sensor and has a programmable control function, and is used to control the lighting mode of the LED array module, the brightness of the LED array, and the display content of the LCD display module; The light field coding algorithm module is used to calculate the viewpoint matrix and fill the sub-pixels at the same position of the corresponding parallax image into the synthetic image to complete the light field coding.

4. The light field display system based on staggered lighting of LEDs according to claim 3, characterized in that: The LED unit size of the LED array module is less than 0.8 mm, and the unit spacing is less than 0.8 mm.

5. The light field display system based on staggered lighting of LEDs according to claim 3, characterized in that: The LCD display module is installed in front of the LED array module. The distance between the LCD display module and the LED array module is less than 2 mm. The size of the LCD liquid crystal layer is not less than 24 inches, and the resolution is not less than 2560*1440.

6. The light field display system based on staggered lighting of LEDs according to claim 3, characterized in that: A microlens array is arranged between the LED array module and the LCD display module.

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