A naked-eye stereoscopic display device

Abstract

The utility model discloses a kind of naked-eye stereoscopic display devices, including the backlight layer, first transparent glass, liquid crystal layer, second transparent glass and light modulator arranged in order along light exit direction;Wherein the backlight layer includes several light emitting units, the light emitting unit at least can emit red, green, blue three kinds of light;The liquid crystal layer includes several liquid crystal units corresponding with light emitting unit, so that the light ray transformation of liquid crystal unit cooperation light emitting unit carries out state refresh, thereby control the intensity of each light ray to pass through, and realize color display by the periodic time sequence transformation of at least red, green, blue three kinds of light;The light modulator is used for adjusting the projection direction of light ray, thereby realizing naked-eye stereoscopic image display.The utility model uses the mode of time division to replace the mode of space division to realize color display, to effectively improve the resolution of naked-eye stereoscopic display device, provide strong support for the popularization and application of naked-eye 3D display.

Description

Technical Field

[0001] This utility model relates to the field of stereoscopic display technology, and in particular to a naked-eye stereoscopic display device. Background Technology

[0002] With the development of display technology, the application of stereoscopic display devices is becoming increasingly widespread. Common stereoscopic display technologies use 3D glasses to transmit different image information to the viewer's left and right eyes separately. However, glasses-free stereoscopic display technology eliminates the need for 3D glasses, greatly improving viewer comfort. Glasses-free stereoscopic display technology often uses a method of splitting the display's light to project different content onto different eyes, thereby creating a stereoscopic perception in the human brain.

[0003] like Figure 1 As shown, current glasses-free stereoscopic display devices mainly include an image display device 101, an optical modulation system 102, and a driving system 103. The image display device is an LCD (liquid crystal display screen) used to display 3D image content, including left-eye and right-eye images. The optical modulation system can be a grating or a lenticular lens, etc., used to project binocular images in a directional manner. The driving system is connected to the image display device and the optical modulation system respectively, thereby realizing the driving coordination between the two.

[0004] The principle behind LCD displays achieving color display is to use color filters to distinguish between three types of subpixels: R, G, and B. Each subpixel is individually controlled by a set of liquid crystal cells to manage light intensity, and these subpixels combine to achieve RGB color display. This spatially divided display method obviously results in a reduction in resolution. Similarly, parallax 3D display technology also uses spatial division to provide the stereoscopic image to the viewer's left and right eyes separately, further reducing resolution and potentially impacting the user experience, thus hindering the wider adoption of glasses-free 3D displays. Summary of the Invention

[0005] Purpose of the invention: To address the above-mentioned shortcomings, this utility model provides a glasses-free stereoscopic display device that uses time-division multiplexing instead of space-division multiplexing to achieve RGB color display, thereby effectively improving the resolution of the glasses-free stereoscopic display device.

[0006] Technical solution: To achieve the above objectives, this utility model provides a naked-eye stereoscopic display device, including a backlight layer, a first transparent glass, a liquid crystal layer, a second transparent glass, and a light modulator, which are arranged sequentially along the light emission direction of the backlight layer;

[0007] The backlight layer includes a plurality of light-emitting units, and the light-emitting units can emit at least three types of light: red, green, and blue.

[0008] The liquid crystal layer includes a plurality of liquid crystal cells corresponding to the light-emitting units. TFT devices are grown on the first transparent glass to control the deflection state of the liquid crystal cells, so that the liquid crystal cells refresh their state in coordination with the light-emitting units, thereby controlling the intensity of each type of light passing through, and achieving color display through the periodic timing change of at least three types of light: red, green, and blue.

[0009] The light modulator is used to adjust the projection direction of the light, thereby enabling naked-eye stereoscopic image display.

[0010] Specifically, the method of achieving color display through the periodic temporal transformation of at least three types of light—red, green, and blue—includes:

[0011] The timing period of the backlight layer includes at least three time units. In one time unit, the backlight layer emits red light, and the naked-eye stereoscopic display device displays the red component. In another time unit, the backlight layer emits green light, and the naked-eye stereoscopic display device displays the green component. In yet another time unit, the backlight layer emits blue light, and the naked-eye stereoscopic display device displays the blue component.

[0012] Optionally, the light-emitting unit adopts a multi-color light source capable of emitting at least red, green, and blue light.

[0013] Optionally, the light-emitting unit consists of at least three monochromatic light sources that emit red, green, and blue light respectively.

[0014] Specifically, the light source is at least one of CCFL, LED, QD-LED, Mini-LED and Micro-LED.

[0015] Furthermore, the light-emitting unit can also emit white light, thereby achieving color display through the periodic temporal transformation of four types of light: red, green, blue, and white.

[0016] Furthermore, the naked-eye stereoscopic display device also includes a driving system, which is connected to the backlight layer, TFT devices and light modulator respectively, thereby realizing synchronous refresh control of liquid crystal cells and light-emitting cells as well as stereoscopic display control of light modulator.

[0017] Preferably, the refresh rate of the backlight layer and the liquid crystal layer is not less than 150Hz.

[0018] Specifically, the optical modulator can be a grating or a cylindrical lens, which is bonded to the second transparent glass via transparent optical adhesive.

[0019] Preferably, the naked-eye stereoscopic display device further includes an eye-tracking module for eye-tracking positioning, which works in conjunction with a light modulator to achieve directional projection of naked-eye stereoscopic images.

[0020] Beneficial effects: This utility model is based on a time-division multiplexing method. By combining the time-series transformation of the light-emitting unit with the refresh of the liquid crystal unit, RGB color display can be achieved. It eliminates the need for three types of CFs to be combined with three sets of liquid crystal units for display. Therefore, the spatial resolution can be increased to three times that of the original, greatly improving the user experience and providing strong support for the promotion and application of naked-eye 3D display. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a naked-eye stereoscopic display device in the prior art;

[0022] Figure 2 This is a cross-sectional structural diagram of a naked-eye stereoscopic display device in the prior art;

[0023] Figure 3 This is a cross-sectional view of the naked-eye stereoscopic display device in an embodiment of this utility model;

[0024] Figure 4 This is a timing control diagram of the naked-eye stereoscopic display device in the embodiments of this utility model;

[0025] Figure 5 This is a schematic diagram showing the distribution of TFT devices in an embodiment of this utility model;

[0026] The figure includes: 101, image display device; 102, light modulation system; 103, driving system; 1011, backlight layer; 1012, first transparent glass; 1013, liquid crystal layer; 1014, second transparent glass; 1015, transparent optical adhesive; 1016, light modulator; 1017, TFT device. Detailed Implementation

[0027] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] like Figure 2 As shown, the glasses-free stereoscopic display device using an LCD screen includes the following structures arranged sequentially from bottom to top:

[0029] ① The backlight layer 1011 is composed of several light-emitting units, which emit only white light when in the bright state;

[0030] ② A first transparent glass 1012, on which a TFT (thin-film transistor) device 1017 is grown;

[0031] ③ The liquid crystal layer 1013 is composed of several liquid crystal units. The liquid crystal units can be deflected to different degrees under the voltage control of the TFT device 1017, thereby controlling the intensity of the light passing through.

[0032] ④ The second transparent glass 1014 has a CF (color filter) attached to it.

[0033] ⑤ The light modulator 1016, which can be a grating or a cylindrical lens, is bonded to the second transparent glass via transparent optical adhesive 1015 to adjust the projection direction of light, thereby realizing naked-eye stereoscopic image display.

[0034] It should be noted that the light-emitting unit here provides only a single light source, namely white light. After passing through the liquid crystal layer 1013, the white light is separated into three colors, red, green and blue, through the filter, thus forming three sub-pixels: R, G and B. Each sub-pixel independently controls the light intensity through a set of liquid crystal units. After combining RGB color light of different intensities, the color display of RGB pixels can be realized.

[0035] Therefore, each pixel in an LCD screen is composed of three types of sub-pixels: R, G, and B. Color control requires three types of color filters (CFs) working in conjunction with three sets of liquid crystal units, resulting in a reduction in resolution. Furthermore, each type of sub-pixel (R, G, B) occupies only one-third of the pixel area, significantly reducing color saturation.

[0036] Based on this, the present invention provides a glasses-free stereoscopic display device, such as... Figure 3 As shown, it also includes a backlight layer 1011, a first transparent glass 1012, a liquid crystal layer 1013, a second transparent glass 1014, and a light modulator 1016 arranged sequentially from bottom to top, but the specific structure is as follows:

[0037] (1) The backlight layer 1011 is also composed of several light-emitting units, but the light-emitting units here can emit at least three kinds of light: red, green and blue.

[0038] (2) The liquid crystal layer 1013 is also composed of several liquid crystal units, and TFT devices 1017 are also grown on the first transparent glass 1012 (specifically distributed as shown in the figure). Figure 5 As shown), it is used to control the deflection state of the liquid crystal unit. However, the liquid crystal unit and the light-emitting unit cooperate with each other, so that the liquid crystal unit refreshes its state in accordance with the light change of the light-emitting unit, thereby controlling the intensity of each light passing through, and achieving color display through the periodic timing change of at least three types of light: red, green, and blue.

[0039] (3) No CF is attached to the second transparent glass 1014;

[0040] (4) The light modulator 1016 can also be a grating or a cylindrical lens, and is bonded to the second transparent glass 1014 by transparent optical adhesive 1015 (which can be OCA or water adhesive, etc.) to adjust the projection direction of light, thereby realizing naked-eye stereoscopic image display.

[0041] Specifically, the light-emitting unit can be a multi-color light source that can emit at least three colors of light: red, green, and blue, or it can be composed of at least three monochromatic light sources that emit red, green, and blue light respectively. Both light sources can be at least one of CCFL, LED, QD-LED, Mini-LED, and Micro-LED.

[0042] Taking LEDs as an example, the light-emitting unit can be a single LED that emits red, green, and blue light, such as an RGB-LED; or it can be three LEDs that emit red, green, and blue light respectively, such as three Mini-LEDs arranged together. Therefore, by controlling the light-emitting unit to turn it on and off, the color of the light emitted by the light source can be directly controlled without the need for filtering by a color filter (CF).

[0043] Specifically, the method of achieving color display through the periodic temporal transformation of at least three types of light—red, green, and blue—includes:

[0044] The timing period of the backlight layer 1011 includes at least three unit time periods. In one unit time period, the backlight layer 1011 emits red light, and the naked-eye stereoscopic display device displays the red component. In another unit time period, the backlight layer 1011 emits green light, and the naked-eye stereoscopic display device displays the green component. In another unit time period, the backlight layer 1011 emits blue light, and the naked-eye stereoscopic display device displays the blue component.

[0045] For example, such as Figure 4 As shown, the backlight layer 1011 emits red, green, and blue light sequentially within a time period:

[0046] During time intervals T0 to T1, the display device shows the R component, i.e., the backlight is on, the red light is on, and the green and blue lights are off;

[0047] During time intervals T1 to T2, the display device shows the G component, i.e., the backlight is on, the green light is on, and the red and blue lights are off;

[0048] During times T2 to T3, the display device shows the B component, that is, the backlight is turned on, the blue light is on, and the red and green lights are off.

[0049] It is important to note that the timing changes of the backlight described above are synchronized with the refresh of the liquid crystal cells, thereby controlling the intensity of each type of light. In this way, the R, G, and B components within each cycle can be added together to form an RGB pixel, which, through the persistence of vision in the human eye, forms a color display. Furthermore, the intervals between cycles (i.e., between T3 and the next T0) can be a unit of time (without emitting any light) or a seamless transition; the choice depends on the specific application and the actual refresh rate.

[0050] By using a time-division multiplexing method, and coordinating the backlight sequence of different colors with the liquid crystal unit, and controlling the refresh of the liquid crystal unit, color display can be achieved. This eliminates the need for three different color filters (CFs) combined with three sets of liquid crystal units, effectively increasing the spatial resolution. Furthermore, each of the red, green, and blue light rays occupies 100% of the pixel area within its own time sequence, thus effectively improving color saturation.

[0051] Furthermore, the light-emitting unit can also emit white light (i.e., red, green, and blue lights emit light simultaneously), thereby achieving color display through the periodic temporal change of the four types of light: red, green, blue, and white. For example, the backlight layer 1011 can emit red, green, blue, and white light sequentially within the time period, thereby improving the overall brightness of the screen and making it more energy-efficient.

[0052] To ensure smooth visuals, the refresh rate (the number of times the screen content is updated per second) of a conventional monitor needs to be above 50Hz. Therefore, for a glasses-free 3D display device that displays pixels using RGB timing, the refresh rate of the backlight layer 1011 and the liquid crystal layer 1013 needs to be at least 150Hz, meaning that updating the image requires at least 3 refreshes. For a glasses-free 3D display device that displays pixels using RGBW timing, the refresh rate of the backlight layer 1011 and the liquid crystal layer 1013 needs to be at least 200Hz, meaning that updating the image requires at least 4 refreshes.

[0053] Furthermore, the naked-eye stereoscopic display device also includes a driving system 102, which is signal-connected to the backlight layer 1011, the TFT device 1017 and the light modulator 1016 respectively, thereby realizing synchronous refresh control of the liquid crystal unit and the light-emitting unit and stereoscopic display control of the light modulator 1016.

[0054] For example, the driving system 102 includes a backlight control chip, a liquid crystal control chip, and a 3D control chip, which are respectively connected to the backlight layer 1011, the TFT device 1017, and the light modulator 1016 for synchronous refresh control of the liquid crystal unit and the light-emitting unit and stereoscopic display control of the light modulator 1016.

[0055] Furthermore, the naked-eye stereoscopic display device also includes an eye-tracking module for eye tracking and positioning. It works in conjunction with the drive system 102 and the light modulator 1016 to project naked-eye stereoscopic images in a directional manner, ensuring that the left and right eye images are accurately projected into the viewer's left and right eyes respectively, thereby achieving a better 3D display effect.

[0056] This invention utilizes a time-division multiplexing approach instead of a space-division multiplexing approach to achieve RGB color display. By increasing the refresh rate in exchange for improved spatial resolution, it effectively enhances the user experience and provides strong support for the widespread application of glasses-free 3D displays. Furthermore, the time-division multiplexing approach further improves the color saturation of glasses-free 3D display devices while reducing their resolution requirements, which helps to further reduce production costs and make the product more environmentally friendly.

[0057] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A glasses-free stereoscopic display device, characterized in that, It includes a backlight layer, a first transparent glass, a liquid crystal layer, a second transparent glass, and a light modulator, arranged sequentially along the light emission direction of the backlight layer; The backlight layer includes a plurality of light-emitting units, and the light-emitting units can emit at least three types of light: red, green, and blue. The liquid crystal layer includes a plurality of liquid crystal cells corresponding to the light-emitting units. TFT devices are grown on the first transparent glass to control the deflection state of the liquid crystal cells, so that the liquid crystal cells refresh their state in coordination with the light-emitting units, thereby controlling the intensity of each type of light passing through, and achieving color display through the periodic timing change of at least three types of light: red, green, and blue. The light modulator is used to adjust the projection direction of the light, thereby enabling naked-eye stereoscopic image display.

2. The naked-eye stereoscopic display device according to claim 1, characterized in that, The method of achieving color display through periodic temporal changes of at least three types of light—red, green, and blue—includes: The timing period of the backlight layer includes at least three time units. In one time unit, the backlight layer emits red light, and the naked-eye stereoscopic display device displays the red component. In another time unit, the backlight layer emits green light, and the naked-eye stereoscopic display device displays the green component. In yet another time unit, the backlight layer emits blue light, and the naked-eye stereoscopic display device displays the blue component.

3. The glasses-free stereoscopic display device according to claim 1, characterized in that, The light-emitting unit uses a multi-color light source that can emit at least three colors: red, green, and blue.

4. The naked-eye stereoscopic display device according to claim 1, characterized in that, The light-emitting unit consists of at least three monochromatic light sources that emit red, green, and blue light respectively.

5. The glasses-free stereoscopic display device according to claim 3 or 4, characterized in that, The light source is at least one of CCFL, LED, QD-LED, Mini-LED and Micro-LED.

6. The glasses-free stereoscopic display device according to claim 1 or 2, characterized in that, The light-emitting unit can also emit white light, thereby achieving color display through the periodic temporal transformation of four types of light: red, green, blue, and white.

7. The glasses-free stereoscopic display device according to claim 1 or 2, characterized in that, It also includes a driving system, which is connected to the backlight layer, TFT devices and light modulator signals respectively, thereby realizing synchronous refresh control of the liquid crystal unit and the light-emitting unit and stereoscopic display control of the light modulator.

8. The glasses-free stereoscopic display device according to claim 1 or 2, characterized in that, The refresh rate of the backlight layer and the liquid crystal layer is not less than 150Hz.

9. The glasses-free stereoscopic display device according to claim 1 or 2, characterized in that, The optical modulator is a grating or a cylindrical lens, which is bonded to a second transparent glass via transparent optical adhesive.

10. The glasses-free stereoscopic display device according to claim 1 or 2, characterized in that, It also includes an eye-tracking module for eye-tracking positioning, which works in conjunction with a light modulator to achieve directional projection of naked-eye stereoscopic images.

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