Naked eye three-dimensional display device

Abstract

A naked eye stereoscopic display device comprises: a group of display pixel arrays arranged in rows and columns; a set of elongate array of optical elements extending parallel to each other and overlying the display pixels, wherein the optical elements are inclined at an angle with respect to a column of display pixels. For any display pixel, the optimized brightness is determined according to the distance between the pixel and the nearest end of the boundary used for separating the adjacent images. By adjusting the pixel brightness, the device can effectively reduce image crosstalk, so that the definition and the image quality of naked eye three-dimensional display are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a display device capable of dynamically adjusting brightness while reducing crosstalk phenomenon to ensure high-quality naked-eye 3D images. BACKGROUND

[0002] In the implementation of naked-eye 3D image display using lenticular lens, the goal is to clearly distinguish and direct light rays in different directions, so as to respectively transmit different images to the left and right eyes. However, crosstalk (i.e. the image intended for one eye leaks to the other eye) may occur at the image boundary, thus causing visual interference such as ghosting. To solve this problem, the brightness of the screen pixels can be adjusted by turning off the pixels at the pitch edge, so as to reduce the crosstalk phenomenon and achieve clearer 3D display images. This technique of turning off pixels at the pitch edge is widely known in the art and is described in Chinese patent CN110662012A. However, if the range of pixels turned off is too large, it may result in a decrease in overall display brightness, and when watching 3D images, the audience may perceive a black grid pattern similar to the "screen window effect". SUMMARY

[0003] The purpose of the present application is to provide an improved naked-eye stereoscopic display device and system. The naked-eye stereoscopic display device provided by the present application comprises a group of display pixel arrays arranged in rows and columns; and a group of optical element arrays composed of a plurality of elongated optical elements extending parallel to each other and covering the display pixels, wherein the optical elements are arranged obliquely with respect to the column direction of the display pixels; for any given pixel, the optimization of brightness is determined based on the distance between the given pixel and the nearest end of the boundary separating adjacent images; the adjacent images include a plurality of pixel groups, which are observed through the optical elements, and the optical elements act as optical guiding devices to respectively guide different images to the viewer's eyes, thus achieving naked-eye stereoscopic display.

[0004] In one embodiment, a display device for improving the quality of autostereoscopic display is provided. The device is capable of maintaining the brightness and clarity of the displayed images while effectively reducing the image crosstalk phenomenon by dynamically adjusting the brightness of each pixel, thereby enhancing the three-dimensional visual experience of the viewer. The display device comprises: an array of display pixels arranged in rows and columns; an array of elongated optical elements extending parallel to each other and overlying the array of display pixels; a memory for storing instructions readable by a computer; and a processor for executing the instructions. The processor is configured to perform the following operations: obtaining the nearest end distance between any display pixel and the boundary separating adjacent images. The adjacent images contain a plurality of pixel groups through which the viewer observes the images from the left and right eyes respectively, and the optical elements serve as optical guiding devices for guiding different images to the viewer's eyes respectively, thereby achieving autostereoscopic display.

[0005] The processor can be further configured to calculate the optimized brightness value of the pixel according to the following formula: B = (1 + tanh(C x (D - 0.5))) / 2, where D is the distance ratio of the distance relative to the pitch of the optical elements (hereinafter referred to as distance ratio), B is the ratio between the optimized brightness and the maximum brightness of the given pixel (hereinafter referred to as brightness ratio), and C is a control coefficient greater than 0 for adjusting the slope of the brightness curve; B = (1 + erf(a x (D - 0.5))) / 2, where D is the distance ratio, B is the brightness ratio, and a is a control coefficient greater than 0 for adjusting the steepness of the brightness transition near the image boundary; B = (arctan(pix x (D - 0.5)) / p) + 0.5, where D is the distance ratio, B is the brightness ratio, and p is a control coefficient greater than 0 for adjusting the slope of the brightness curve; B = (2 / p) x arctan(tanh(C x (D - 0.5) / 2)) + 1 / 2, where D is the distance ratio, B is the brightness ratio, and C is a control coefficient greater than 0 for adjusting the slope of the brightness curve; B = (1 + e^(-C x (D - 0.5)))^(-a), where D is the distance ratio, B is the brightness ratio, and C and a are control coefficients greater than 0 for controlling the slope and sharpness of the transition near the inflection point; and B = x / , where x = C x (D - 0.5), D is the distance ratio, B is the brightness ratio, and C is a control coefficient greater than 0 for adjusting the slope of the brightness curve.

[0006] Through the above design, the display device can adjust the brightness according to the position difference of the pixels relative to the image boundary, appropriately reduce the brightness of the pixels near the boundary, and keep the brightness of the central region high, so as to effectively suppress the crosstalk phenomenon and improve the display effect and viewing comfort of the stereoscopic image without sacrificing the overall image brightness.

[0007] In an embodiment, the optical element can be replaced by a liquid crystal lens. The liquid crystal lens extends along the third direction and repeatedly forms groups of display pixels separated by adjacent image boundaries. The liquid crystal lens includes a plurality of lens units for forming a plurality of groups of display pixels separated by boundaries between adjacent images. In an embodiment, the brightness is optimized to reduce crosstalk. For any display pixel, the brightness value is determined according to the distance between the nearest end of the boundary separating adjacent images. The brightness value gradually increases from the pixels at the boundary to the central pixels of each viewpoint image (the central pixels have the least crosstalk and are set to the maximum brightness). To achieve the above purpose, a liquid crystal lens is provided, including an upper substrate, a lower substrate, a liquid crystal layer sandwiched between the upper and lower substrates, and a transparent electrode layer provided on the inner surface of the upper and / or lower substrate. By applying a voltage to the liquid crystal layer through the transparent electrode layer, the orientation state of the liquid crystal molecules can be controlled as needed, so that the liquid crystal lens exhibits lens function or remains transparent in different operating modes.

[0008] In a preferred embodiment, the transparent electrode layer includes a plurality of strip-shaped electrodes arranged in parallel with each other, and the strip-shaped electrodes are pre-set with a spacing to form a plurality of lens unit regions. Each lens unit region corresponds to a lens unit in the liquid crystal layer, and the lens unit can realize lens function according to actual needs through voltage adjustment, for guiding different view angle images into the eyes of the viewer respectively. Preferably, the liquid crystal layer is a nematic liquid crystal layer, which has good electro-optic response characteristics and optical uniformity. The upper substrate and / or the lower substrate can be a glass substrate or a plastic substrate, which has good mechanical strength and light transmission performance and is suitable for various portable or fixed display devices. In specific applications, the liquid crystal lens can be arranged above the display pixel array, combined with multi-view image output technology, to guide different images to the left and right eyes of the viewer respectively, produce a stereoscopic visual effect, and realize a naked-eye 3D display experience without wearing glasses. Further, each lens unit of the liquid crystal lens can correspond to the pixel arrangement of the display pixel array, improving the accuracy and image quality of stereoscopic display. By controlling the voltage applied to the transparent electrode layer, the liquid crystal lens can realize rapid switching between lens function and transparent mode to meet different use scenario requirements.

[0009] In another preferred embodiment, a system is provided for providing images to a viewer's eyes separately. The system includes a display pixel array arranged in rows and columns; and a lenticular lens array composed of multiple elongated lenticular lens elements extending parallel to each other and disposed above the display pixel array. The display pixels are viewed through the lenticular lens array, which acts as an optical guiding device to direct different images to the viewer's eyes respectively, thereby achieving glasses-free stereoscopic display. The pitch of the lenticular lens elements is greater than the distance between a given pixel and the nearest end of the boundary separating adjacent images in the row direction. To achieve the above objective, a lenticular lens structure for glasses-free stereoscopic display is provided, comprising: a transparent substrate; multiple elongated lenticular lens units disposed on the substrate, the lenticular lens units extending parallel in the same direction and having a preset pitch; wherein the lenticular lens units have curved optical surfaces for guiding images emitted from the display pixel array to the viewer's left and right eyes respectively, thereby achieving a glasses-free stereoscopic display effect. Furthermore, the cross-section of the lenticular lens unit can be semi-circular, elliptical, parabolic, or have a preset curvature, or other flat-topped prismatic, trapezoidal, or polyhedral prism shapes, to adapt to different optical requirements. Furthermore, the lenticular lens unit is arranged parallel to the column direction of the display pixel array, or tilted at a preset angle to the column direction, to optimize the image viewing angle and stereoscopic display effect. Furthermore, the substrate is preferably made of transparent glass or transparent plastic material, including polycarbonate, polyester film, or other optically transparent materials, possessing good optical transmittance and mechanical strength. Furthermore, the lenticular lens structure can be fabricated by injection molding, embossing, photolithography, UV curing, or roll coating, with simple processes, controllable costs, and suitability for mass production.

[0010] The proposed system effectively reduces crosstalk and improves the clarity of 3D images by dynamically adjusting pixel brightness based on the pixel's position relative to the image boundary. In a preferred embodiment, the optimized brightness is determined according to the following formula: B = 1 / (1 + e^(-C × (D -0.5))), where C is a coefficient greater than 0, D is the distance ratio, and B is the brightness ratio. Thus, the brightness of each pixel can be finely adjusted based on the distance and the selected control coefficient C. Different control coefficients C are selected according to the characteristics of the optical elements to achieve different degrees of crosstalk suppression.

[0011] In another preferred embodiment, a display device is provided, comprising: a display pixel array configured to generate images for a viewer to view; an optical element array disposed above the display pixel array, configured to guide different images to the viewer's left and right eyes respectively to achieve naked-eye stereoscopic perception; a memory configured to store computer instructions executable by a processor; and a processor configured to execute the instructions, and further configured to: obtain a distance d between any display pixel and the nearest end of a boundary used to separate adjacent images; calculate a distance ratio D, defined as D = d / Lp, where Lp is the pitch of the optical element; and determine a ratio B between the optimized brightness of the display pixel and the maximum brightness of the given pixel based on the distance ratio D, wherein the ratio B is calculated according to a sigmoid function, the sigmoid function being a continuously differentiable function, and the ratio B approaches 0 when the ratio D approaches 0, and approaches 1 when the ratio D approaches 1, and the ratio D = ... The brightness adjustment method has an inflection point at 0.5, which can reduce crosstalk at the image boundaries and improve the quality of the stereoscopic image presented to the viewer.

[0012] Other objectives of the present invention will become apparent to those skilled in the art after reading the detailed description of the preferred embodiments shown in conjunction with the accompanying drawings. The technical solution provided by the present invention not only improves the imaging clarity of naked-eye stereoscopic displays but also retains the feasibility of the system structure and the flexibility of the control strategy, and can be widely applied in various 3D display scenarios. The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the present invention will be described in detail below with reference to preferred embodiments and accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a traditional glasses-free stereoscopic display device.

[0014] Figure 2 This illustrates an array composed of display pixels arranged in rows and columns.

[0015] Figure 3 The diagram illustrates how optical elements can guide different images to the viewer's eyes separately.

[0016] Figure 4 This illustrates a pixel group consisting of adjacent display pixels.

[0017] Figure 5 This illustrates how brightness is determined based on the distance between a given pixel and its nearest boundary.

[0018] Figure 6 A liquid crystal lens is described, which repeatedly forms multiple sets of display pixels and is separated by boundaries.

[0019] Figure 7 This indicates that each lens unit can extend along a third direction that intersects the column direction.

[0020] Figure 8 One embodiment is described, wherein the brightness of each pixel can be adjusted according to its distance and a selected control coefficient.

[0021] Figure 9 Another embodiment is described, showing different brightness change curves resulting from selecting different control coefficients.

[0022] Figure 10 Another embodiment is shown, presenting different brightness variation curves.

[0023] Figure 11 Another embodiment is described, which is an alternative formula for calculating optimized brightness.

[0024] Figure 12 Different alternative formulas for calculating optimized brightness are explained.

[0025] Figure 13 Further embodiments are described for calculating optimized brightness.

[0026] Figure 14 Another embodiment is described, in which the system can direct different images to the viewer's eyes, thereby achieving glasses-free stereoscopic display.

[0027] Figure 15 This illustrates that different images are composed of different groups of pixels.

[0028] Figure 16 Another embodiment is described, in which the processor executes readable instructions to provide a glasses-free stereoscopic display effect.

[0029] Figure 17 This illustrates another embodiment for determining the optimal brightness of any pixel.

[0030] Figure 18 The illustration shows a pixel group composed of adjacent display pixels in the aforementioned embodiment. Detailed Implementation

[0031] The following detailed description refers to embodiments illustrated in the accompanying drawings. Numerous specific details are disclosed in the following detailed description to aid in a more thorough understanding of the invention. However, those skilled in the art will understand that the invention can be practiced even without these specific details. In other instances, certain well-known methods and components have not been described in detail to avoid unnecessarily lengthy descriptions of embodiments of the invention.

[0032] like Figure 1 andFigure 2 As shown, a glasses-free stereoscopic display device includes a pixel array 3 composed of display pixels 5 arranged in rows and columns. The pixel array 3 is constructed along the row direction (X-axis) and the column direction (Y-axis). In the Z direction, perpendicular to the X and Y axes, another array composed of elongated optical elements 11 is provided. These optical elements are arranged parallel to each other and cover the pixel array 3. Figure 3 and Figure 4 As shown, display pixel 5 is observed through optical element 11. This optical design guides different images (e.g., pixel groups R1, R2, L1, L2) to the viewer's eyes respectively, thus achieving a glasses-free 3D display effect. Traditional 3D displays (such as movies) require viewers to wear polarized glasses or shutter glasses to receive images for the left and right eyes separately. Glasses-free 3D technology, however, uses the optical design of the display device itself to allow the viewer's left and right eyes to naturally receive images from different perspectives, thereby producing a stereoscopic visual effect (depth-of-view).

[0033] The optical element 11 is tilted relative to the column direction (Y-axis) of the display pixels to optimize the separation of visual information, thereby repeatedly forming pixel groups (e.g., R1, R2, L1, L2) composed of adjacent display pixels 5. Naked-eye stereoscopic display technology with a tilted structure is widely described in the prior art (e.g., US Patent 6064424A). Further related prior art can be found in International Patent Classification G02B30 / 27 — Optical systems or apparatus for producing three-dimensional (3D) effects, such as using a lenticular lens array in naked-eye stereoscopic displays to provide parallax images to the left and right eyes of the viewer to achieve stereoscopic display. Additionally, reference can be made to International Patent Classification H04N13 / 317 — Image reproduction apparatus for viewing without special glasses, i.e., naked-eye stereoscopic display devices employing tilted parallax optical elements.

[0034] like Figure 5 As shown, for any pixel 6 in the display pixels, its optimized brightness can be determined based on the distance d between pixel 6 and the nearest end of the "boundary 7 used to separate adjacent images" in the row direction (X-axis). As previously stated... Figure 3 and Figure 4 As shown, the adjacent images include multiple pixel groups (e.g., L1, R1, L2, R2). Viewers observe the images through these pixel groups, and the optical element, as an optical guiding device, presents different images to the viewer's eyes respectively, thereby achieving a naked-eye 3D display effect.

[0035] In another embodiment, such as Figure 6 and Figure 7As shown, the optical element can be a liquid crystal lens 8. A display device 100 may include a display panel 9 configured to generate images and having a display surface whose row direction X is substantially perpendicular to the column direction Y; the liquid crystal lens 8 may be disposed on the display panel 9 and includes a plurality of lens units 81, each lens unit 81 extending along a third direction intersecting the column direction Y. The plurality of lens units 81 may repeatedly form a plurality of display pixel groups (e.g., pixel groups R1, L1), which are separated from each other by boundaries 7 of adjacent images. In view of this, a mathematical formula can be used to calculate the display brightness of each pixel. For any given pixel (e.g., pixel 6), the nearest distance of its boundary 7 between it and the adjacent viewpoint image is measured, and this distance is substituted as an input value into the formula. The formula is then used to determine the appropriate brightness level of the pixel. Since the crosstalk generated by the central pixel of each viewpoint image is minimal, the formula is designed so that the output value reaches a maximum value of 1 when D = 1. Therefore, the optimized brightness can be determined according to the following formulas: B = (1 + tanh(C × (D - 0.5))) / 2; B = (1 + erf(α × (D - 0.5))) / 2; B = (arctan(π × (D - 0.5)) / π) + 0.5; B = (2 / π) × arctan(tanh(C × (D - 0.5) / 2)) + 1 / 2; B = (1 + e^{-C × (D - 0.5)})^{-α}; and B = x / , where x = C × (D - 0.5).

[0036] In the above formula: C and α are control coefficients greater than 0; D is the distance ratio, that is, the ratio between the distance from a given pixel to the nearest boundary and the optical element pitch Lp (the pitch is the distance between the boundaries 7 used to separate adjacent images composed of different pixel groups, such as...). Figure 6 (As shown in the figure); B is the brightness ratio, which is the ratio between the optimized brightness of a given pixel and the maximum brightness of that pixel. Depending on the characteristics of the optical components, different control coefficients C can be selected to achieve different degrees of crosstalk suppression.

[0037] In a preferred embodiment, C is set to be greater than 10 because when C exceeds this threshold, it ensures that when D = 1, the output value is close to 1 (see [reference]). Figure 8According to the formula B = (1 + tanh(C × (D - 0.5))) / 2), the control coefficient C can still be adjusted according to actual needs. For example, C can be set to 30, and as C increases, the brightness transition becomes steeper. In the row direction X, the central pixel of each viewpoint image experiences the least crosstalk and is therefore set to the highest brightness. Starting from the pixel near the boundary 7, the brightness of each pixel gradually increases. For example, the brightness of a pixel located between the boundary 7 and the central pixel is set lower than the brightness of the central pixel of the corresponding image. Starting from the pixel near the boundary, the brightness of each pixel can gradually increase; while the brightness of a pixel located between any boundary and any central pixel can be set lower than the brightness of the central pixel of that image.

[0038] In a further embodiment, the function may also be an error function (erf) or an arctangent function (arctan), for example, see [link to relevant documentation]. Figure 9 B = (1 + erf(α × (D - 0.5))) / 2, where α is a positive control coefficient that controls the slope of the brightness transition. The solid line in the figure corresponds to α = 10, indicating a relatively gentle brightness change; the dashed line corresponds to α = 30, indicating a steeper change at the image boundary. It can be seen from the figure that the larger the α value, the more concentrated the inflection point region, which helps control brightness attenuation at the image boundary, thereby reducing crosstalk. In another embodiment (see...) Figure 10 The function can be: B = (arctan(π ×(D - 0.5)) / π) + 0.5. All of the above functions are continuously differentiable S-shaped curves with inflection point characteristics, enabling smooth transitions in pixel brightness and effectively reducing visual interference at image boundaries.

[0039] In other embodiments, the function can be a Gudermannian function, expressed as: B = 2 / π ×arctan(tanh(C×(D - 0.5) / 2)) + 1 / 2, where C is a positive control coefficient controlling the slope of the brightness change. See also Figure 11 The dashed line represents C=5, corresponding to a relatively gentle brightness transition; the solid line represents C=20, indicating a steeper brightness change at the boundary. As shown in the figure, a larger C value makes the transition area more concentrated, allowing for a rapid reduction in brightness at image boundaries to reduce crosstalk. In another embodiment (see...) Figure 12 This function can be a generalized logistic function, expressed as: B = (1 + e^{-C×(D - 0.5)})^{-α}, where C and α are positive constants controlling the curvature. As the value of α or C increases, the slope of the curve near the inflection point also increases accordingly.

[0040] Another example function is: B = x / sqrt(1 + x^2), where x = C×(D - 0.5), as shown below. Figure 13 As shown, the dashed line corresponds to C = 5, and the solid line corresponds to C = 20. As the value of C increases, the brightness change becomes steeper near D = 0.5, indicating more drastic brightness changes in the image boundary region. All of the above functions possess the characteristics of being S-shaped, continuously differentiable, and suitable for brightness adjustment, and can be used to reduce crosstalk and improve the image quality of glasses-free stereoscopic display systems.

[0041] In one embodiment, see Figure 14 and Figure 15 A system for providing different images (e.g., pixel groups L1, R1, L2, R2) to the eyes of a viewer to achieve glasses-free stereoscopic display, the system comprising: the glasses-free stereoscopic display device, the device including means for generating a display image, the display image including a display pixel array arranged in rows and columns; and an array of elongated cylindrical lens elements 13 extending parallel to each other and covering the display pixel array, the display pixels being viewed through the cylindrical lens elements, the cylindrical lens elements acting as optical guiding devices to guide different images to the eyes of the viewer to achieve glasses-free stereoscopic display effect; wherein, the pitch Lp of the cylindrical lens elements 13 in the row direction (X-axis) is greater than the distance d between the nearest ends of the boundaries between any pixel and adjacent images.

[0042] In view of the above, the system further includes the aforementioned step of calculating the ratio B between optimized brightness and maximum brightness, wherein this ratio is calculated according to the following formula: B = 1 / (1 + e^(- C × (D - D 0.5))). In this formula, C is a coefficient greater than 0; D is the distance ratio, i.e., the ratio of the distance between a given pixel and its nearest boundary to the optical element pitch Lp (i.e., the pitch used to separate the boundaries between adjacent images composed of different pixel groups); and B is the ratio between the optimized brightness and maximum brightness of any pixel. In short, this glasses-free stereoscopic display system includes an array of display pixels arranged in rows and columns, and an array of lenticular lens optical elements. These optical elements have a pitch Lp, which is greater than the distance d from the pixel to the boundary, and can direct different images to the viewer's eyes, thereby achieving a 3D display effect without the need for glasses.

[0043] In view of the above, such as Figure 16 , Figure 17 and Figure 18As shown, a glasses-free stereoscopic display device 200 may include: a display pixel array 201 arranged in rows and columns; and an optical element array 202 composed of multiple elongated optical elements extending parallel to each other and covering the display pixels. For any given pixel, its optimized brightness is determined based on the distance between the given pixel and the nearest edge of the boundary used to separate adjacent images. The adjacent images include multiple pixel groups, which are observed through the optical elements. The optical elements act as optical guiding devices to direct different images to the viewer's eyes, thereby achieving glasses-free stereoscopic display. To enhance flexibility in practical applications, the processor can automatically select different types of sigmoid functions and their corresponding parameters based on the device type, viewing distance, parallax requirements, or dynamic characteristics of the displayed content. For example, when playing rapidly changing stereoscopic videos, the tanh function can be selected and the control coefficient increased to achieve a faster brightness transition; while in static displays or scenarios with mixed text and images, the sigmoid or erf function can be used to obtain a more stable brightness transition effect. In addition, the S-shaped function can also be pre-stored in memory and implemented in the form of a lookup table (LUT). When the image is displayed, the processor can quickly look up the table according to the distance ratio D calculated in real time to obtain the corresponding brightness adjustment value, thereby improving the computing efficiency and reducing power consumption.

[0044] In another embodiment, a display device 200 for realizing naked-eye stereoscopic display is provided. The display device 200 includes: a display pixel array 201 arranged in rows and columns for generating images for a viewer to view; an optical element array 202 disposed above the display pixel array 201, wherein the optical elements 13 (belonging to the optical element array 202) are elongated structures extending parallel to each other and configured to guide different images (e.g., pixel groups L1, R1, L2, R2) to the left and right eyes of the viewer respectively, thereby realizing naked-eye stereoscopic perception; a memory 203 for storing instructions executed by a processor 204; and a processor 204 for executing the instructions, the processor being configured to perform the following steps: (1) for any display pixel 901, obtaining the distance d between the pixel 901 and the nearest end of the boundary used to separate adjacent images; (2) calculating the distance ratio D = d / Lp, where Lp is the pitch of the optical element 13, such as Figure 17 As shown, the pitch Lp is greater than the distance from the pixel to the nearest end of the adjacent image boundary in the row direction; (3) Based on the distance ratio D, determine the ratio B between the optimized brightness and the maximum brightness of the pixel 901, wherein the ratio B is calculated according to a monotonically increasing S-shaped function, which is continuously differentiable. When the ratio D approaches 0, the ratio B approaches 0; when the ratio D approaches 1, the ratio B approaches 1, and there is an inflection point at the ratio D = 0.5.

[0045] By using this S-shaped brightness adjustment function, pixels near the image center have higher brightness, while pixels near the image boundaries have relatively lower brightness. This configuration helps reduce crosstalk artifacts in stereoscopic image display, improving image clarity and stereoscopic perception. In short, the device includes: a display pixel array, elongated optical elements, a memory, and a processor. The processor calculates the optimized brightness value of a pixel using the formula described above, based on the distance between the pixel and its nearest boundary. The steps performed by the components include: obtaining the distance d from the pixel to the boundary used to separate adjacent images; calculating the distance ratio D and brightness ratio B using a predetermined formula (S-shaped function); and adjusting the brightness based on the calculation results to reduce crosstalk and improve 3D display clarity.

[0046] In another embodiment, a display device is provided, including a display pixel array configured to generate images for a viewer to view; an optical element array disposed above the display pixel array, configured to guide different images to the viewer's left and right eyes respectively to achieve naked-eye stereoscopic perception; a memory configured to store computer instructions executable by a processor; a processor configured to execute the instructions; and a camera disposed on the front surface of the display device for tracking human eye position information, wherein the processor is electrically connected to the camera and is configured to generate control signals based on the human eye position information, and further configured to: acquire arbitrary display pixels and for separating... The distance d between the nearest ends of the boundaries of adjacent images; the distance ratio D is calculated; the optical element is a dynamic grating, a technology well known in the art and described in Chinese patent CN103207456B, the dynamic grating including multiple bright and dark stripes for adaptively changing the position of the bright and dark stripes according to different viewing positions of the two eyes; and the brightness ratio B is determined according to the distance ratio D, wherein the ratio B is calculated according to a sigmoid function, the sigmoid function being a continuously differentiable function, and when the ratio D approaches 0, the ratio B approaches 0, when the ratio D approaches 1, the ratio B approaches 1, and has an inflection point at D = 0.5.

[0047] This invention improves the display quality of naked-eye stereoscopic displays through the following methods: providing a system that effectively directs different images to the viewer's eyes to enhance the 3D viewing experience; optimizing pixel brightness based on the distance between pixels and adjacent image boundaries to reduce crosstalk; introducing a computational model to dynamically determine the optimized brightness value using mathematical formulas; developing a display device with memory and a processor for automated brightness optimization; and establishing a pixel brightness calculation and control method for outputting 3D images to ensure a clearer stereoscopic visual effect. The above are merely various variations and embodiments of this application and should not be construed as limiting the scope of implementation. Any simple equivalent changes and modifications made in accordance with the scope of this patent application and the patent specification shall still fall within the scope of this patent.

Claims

1. A glasses-free stereoscopic display device, characterized in that, include: An array of display pixels arranged in rows and columns; as well as An array of elongated optical elements extending parallel to each other and covering the display pixels, wherein, for any given pixel, its optimized brightness is determined based on the distance between the given pixel and the nearest end of the boundary used to separate adjacent images; The adjacent images include multiple pixel groups. The pixel groups are observed through the optical element as optical guiding devices to guide different images to the viewer's eyes, thereby achieving naked-eye stereoscopic display. The optical element is a liquid crystal lens, comprising multiple lens units for forming multiple display pixel groups separated by boundaries between adjacent images; The optimized brightness is determined according to the following formula: B = 1 / (1 + e^(- C × (D - 0.5))), where C is a coefficient greater than 0, D is the ratio of the distance to the pitch of the optical element, and B is the ratio between the optimized brightness and the maximum brightness of the given pixel.

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