A low color difference transparent display device

Abstract

In order to solve the problem of color difference that is easy to occur in polarization modulation stereoscopic display using a 1 / 4 wave plate, the present invention proposes a low color difference transparent display device. The low color difference transparent display device includes a directional polarized light source, a reflector and a transparent liquid crystal display panel. In time division multiplexing, in any time slot, some pixels on the 2D display panel are lit, and their light is projected by the lens array, reflected by the reflector and adjusted in polarization direction, and then passes through the transparent liquid crystal display panel to form a viewpoint. The transparent liquid crystal display panel synchronously provides a parallax image corresponding to the viewpoint position. For any lit pixel on the 2D display panel, its sub-pixel value is modulated to a fixed value related to the lens angle, so that the colored light generated by the pixel is restored to white light after being polarized by the polarizer, adjusted in polarization direction by the 1 / 4 wave plate and analyzed by the analyzer. At this time, a directional light source without color difference is provided for the transparent liquid crystal display panel, thereby reducing the color difference introduced by the polarizer and the wave plate.

Description

Technical Field

[0001] The present invention belongs to the technical field of stereoscopic display, and more specifically, relates to a low-color-difference transparent display device. Background Art

[0002] A display device based on the principle of hybrid stereoscopic vision (patent number: 202310776963X) can realize transparent stereoscopic display. However, its optical structure uses optical structures such as 1 / 4 wave plates and polarizers, so the final image will have chromatic aberration. One point that needs to be explained in particular is that for light in different emission directions, different chromatic aberrations will be produced due to the different relative angles between the light and the polarizer. To solve this problem, the present invention proposes a transparent display device with low chromatic aberration. Summary of the invention

[0003] In order to solve the problem of chromatic aberration that is easy to occur in polarization modulation stereoscopic display using a 1 / 4 wave plate, the present invention proposes a low chromatic aberration transparent display device.

[0004] The low-color-difference transparent display device comprises a directional polarized light source, a reflector and a transparent liquid crystal display panel.

[0005] The directional polarized light source, the reflector and the transparent liquid crystal display panel form a triangular prism structure, and the directional polarized light source, the reflector and the transparent liquid crystal display panel are not located on parallel planes of the triangular prism.

[0006] The directional polarized light source is composed of a 2D display panel, a lens array and a polarizing plate; the 2D display panel, the lens array and the polarizing plate are arranged in sequence from back to front; and the front thereof points to the inside of the triangular prism.

[0007] Optionally, the lens array is replaced by a cylindrical lens grating.

[0008] The reflector is composed of a transparent substrate, a semi-transparent and semi-reflective layer, and a quarter-wave plate; the transparent substrate, the semi-transparent and semi-reflective layer, and the quarter-wave plate are placed in sequence from back to front; and the front thereof points to the inside of the triangular prism.

[0009] Preferably, the quarter wave plate of the reflector is covered with an anti-reflection film.

[0010] The transparent liquid crystal display panel is located inside the triangular prism and is covered with a polarizer on one side; the polarization direction of the polarizer is orthogonal to the polarization direction of the polarizer in the directional polarized light source.

[0011] The light emitted by each pixel on the 2D display panel is projected in a direction through the lens array.

[0012] In time division multiplexing, in any time slot, part of the pixels on the 2D display panel are lit, and the light is projected by the lens array, reflected by the reflector and adjusted in polarization direction, and then passes through the transparent liquid crystal display panel to form a viewpoint. The transparent liquid crystal display panel synchronously provides a parallax image corresponding to the viewpoint position. In the next time slot, another part of the pixels on the 2D display panel is lit, thereby forming another viewpoint, and the transparent liquid crystal display panel provides another parallax image, thereby achieving stereoscopic display.

[0013] At the same time, since the reflector can transmit light, it can achieve transparent three-dimensional display.

[0014] For any pixel on the 2D display panel, let the lens angle corresponding to it in the pixel row direction be α , and the lens angle corresponding to it in the pixel row direction is β , then when it is lit, its sub-pixel values ​​R, G and B are pre-modulated to a certain value; and R, G and B are α and β The function makes the colored light emitted by the pixel return to white light after polarization by the polarizer, polarization direction adjustment by the quarter wave plate and polarization analysis by the analyzer. At this time, a directional light source without color difference is provided for the transparent liquid crystal display panel, thereby reducing the color difference introduced by the polarizer and wave plate.

[0015] R, G and B α and β The functional relationship is solved according to the Stokes parameter formula and corrected according to the chromatic aberration of the polarizer itself.

[0016] As an alternative, only the analyzer is retained at the position of the transparent liquid crystal display panel, and the transparent liquid crystal display panel is moved to the position of the directional polarized light source and placed between the lens array and the polarizer.

[0017] Preferably, the area where pixels are lit on the 2D display panel is consistent with the image area on the transparent liquid crystal display panel.

[0018] In summary, the present invention performs color pre-modulation on each pixel at different positions on the 2D display panel in the directional polarized light source, so that these pixels are directional projected, and then restored to white light after being polarized by the polarizer, adjusted in polarization direction by the quarter wave plate, and analyzed by the analyzer. Finally, the present invention can effectively solve the color difference problem of the transparent stereoscopic display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a schematic structural diagram of the reflector of the present invention.

[0021] Figure 3 Schematic diagram of the structure of the directional polarized light source of the present invention (pixel row direction).

[0022] Figure 4 Schematic diagram of the structure of the directional polarized light source of the present invention (pixel column direction).

[0023] Icon: 100-directional polarized light source; 200-reflector; 300-transparent liquid crystal display panel; 210-glass substrate; 220-semi-transparent and semi-reflective layer; 230-1 / 4 wave plate; 240-anti-reflection film; 110-2D display panel; 120-lens array; 130-polarizer; 111-pixel A.

[0024] It should be understood that the above drawings are only schematic and are not drawn to scale. DETAILED DESCRIPTION

[0025] Figure 1 A low color difference transparent display device is provided in this embodiment.

[0026] The low color difference transparent display device includes a directional polarized light source 100 , a reflector 200 and a transparent liquid crystal display panel 300 .

[0027] The directional polarized light source 100 , the reflector 200 and the transparent liquid crystal display panel 300 form a triangular prism structure, and the directional polarized light source 100 , the reflector 200 and the transparent liquid crystal display panel 300 are not located on parallel planes of the triangular prism.

[0028] Please refer to Figure 3 The directional polarized light source 100 is composed of a 2D display panel 110, a lens array 120 and a polarizer 130; the 2D display panel 110, the lens array 120 and the polarizer 130 are arranged in sequence from back to front; the front thereof points to the inside of the triangular prism.

[0029] Please refer to Figure 2 The reflector 200 is composed of a transparent substrate, a semi-transparent and semi-reflective layer 220, and a quarter-wave plate 230; the transparent substrate is made of a glass substrate 210; the transparent substrate, the semi-transparent and semi-reflective layer 220, and the quarter-wave plate 230 are placed in sequence from back to front; the quarter-wave plate 230 of the reflector 200 is covered with an anti-reflection film 240; and its front points to the inside of the triangular prism.

[0030] One side of the transparent liquid crystal display panel 300 located inside the triangular prism is covered with an analyzer, and the polarization direction of the analyzer is orthogonal to the polarization direction of the polarizer 130 in the directional polarized light source 100, so that the viewer cannot directly see the directional polarized light source 100.

[0031] Light emitted by each pixel on the 2D display panel 110 is projected in a direction through the lens array 120 .

[0032] In a time-division multiplexing manner, in any time slot, part of the pixels on the 2D display panel 110 are lit, and the light is projected by the lens array 120, reflected by the reflector 200 and adjusted in polarization direction, and then passes through the transparent liquid crystal display panel 300 to form a viewpoint. The transparent liquid crystal display panel 300 synchronously provides a parallax image corresponding to the viewpoint position. In the next time slot, another part of the pixels on the 2D display panel 110 are lit, thereby forming another viewpoint, and the transparent liquid crystal display panel 300 provides another parallax image, thereby achieving stereoscopic display.

[0033] At the same time, since the reflector 200 can transmit light, it can realize transparent three-dimensional display.

[0034] Please refer to Figure 3 and Figure 4 For any pixel A 111 on the 2D display panel 110, the lens angle corresponding to the pixel A 111 in the pixel row direction is α , and the lens angle corresponding to it in the pixel row direction is β , then when it is lit, its sub-pixel values ​​R, G and B are pre-modulated to a certain value; and R, G and B are α and β The function makes the colored light emitted by the pixel return to white light after polarization by the polarizer 130, polarization direction adjustment by the quarter wave plate 230 and polarization analysis by the analyzer. At this time, a directional light source without color difference is provided for the transparent liquid crystal display panel 300, thereby reducing the color difference introduced by the polarizer and the wave plate.

[0035] R, G and B α and β The functional relationship is solved according to the Stokes parameter formula and corrected according to the chromatic aberration of the polarizer itself.

[0036] In summary, the present invention performs color pre-modulation on each pixel at different positions on the 2D display panel 110 in the directional polarized light source 100, so that these pixels are directional projected, and are sequentially polarized by the polarizer 130, adjusted in polarization direction by the quarter wave plate 230, and analyzed by the analyzer to restore to white light. Finally, the present invention can effectively solve the color difference problem of the transparent stereoscopic display device.

Claims

1. A low color difference transparent display device, characterized in that: The low-color-difference transparent display device comprises a directional polarized light source, a reflector and a transparent liquid crystal display panel; The directional polarized light source, the reflector and the transparent liquid crystal display panel form a triangular prism structure, and the directional polarized light source, the reflector and the transparent liquid crystal display panel are not located on parallel planes of the triangular prism; The directional polarized light source is composed of a 2D display panel, a lens array and a polarizing plate; the 2D display panel, the lens array and the polarizing plate are arranged in sequence from back to front; Its front is pointing to the inside of the triangular prism; The reflector is composed of a transparent substrate, a semi-transparent and semi-reflective layer, and a quarter-wave plate; the transparent substrate, the semi-transparent and semi-reflective layer, and the quarter-wave plate are placed in sequence from back to front; Its front is pointing to the inside of the triangular prism; The transparent liquid crystal display panel is located inside the triangular prism and is covered with a polarizer on one side; the polarization direction of the polarizer is orthogonal to the polarization direction of the polarizer in the directional polarized light source; The light emitted by each pixel on the 2D display panel is projected in a direction through the lens array; In a time-division multiplexing manner, in any time slot, part of the pixels on the 2D display panel are lit, and the light is projected by the lens array, reflected by the reflector and the polarization direction is adjusted, and then passes through the transparent liquid crystal display panel to form a viewpoint; the transparent liquid crystal display panel synchronously provides a parallax image corresponding to the viewpoint position; in the next time slot, another part of the pixels on the 2D display panel are lit, thereby forming another viewpoint, and the transparent liquid crystal display panel provides another parallax image, thereby realizing stereoscopic display; At the same time, the reflector transmits light to achieve a transparent three-dimensional display; For any pixel on the 2D display panel, let the lens angle corresponding to it in the pixel row direction be α , and the lens angle corresponding to it in the pixel row direction is β , then when it is lit, its sub-pixel values ​​R, G and B are α and β The function makes the colored light emitted by the pixel be restored to white light after being polarized by the polarizer, adjusted in polarization direction by the quarter wave plate and analyzed by the analyzer; R, G and B α and β The functional relationship is solved according to the Stokes parameter formula and corrected according to the chromatic aberration of the polarizer itself.

2. A low color difference transparent display device as claimed in claim 1, characterized in that: The lens array is replaced by a cylindrical lens grating.

3. The low color difference transparent display device according to claim 1, characterized in that: The reflector's quarter wave plate is covered with an anti-reflection coating.

4. The low color difference transparent display device according to claim 1, characterized in that: Only the analyzer is kept at the position of the transparent liquid crystal display panel, and the transparent liquid crystal display panel is moved to the position of the directional polarized light source and placed between the lens array and the polarizer.

5. The low color difference transparent display device according to claim 1, characterized in that: The area where the pixels on the 2D display panel are lit is consistent with the image area on the transparent liquid crystal display panel.

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