A display device for improving resolution using a color filter raster

Abstract

The application relates to a display device with a filter color grating for improving resolution. Full-color display is realized by adopting a double liquid crystal structure. In cooperation of a rotating liquid crystal device in a lower liquid crystal layer and a filter color grating structure, a single sub-pixel unit can emit light of two colors or a mixed color. The display device comprises a light guide plate backlight source, upper and lower polarizing sheets, two layers of liquid crystal optical adjustment layers and a filter color grating composite structure in the two layers of optical adjustment layers. Each pixel has two grating structure units for controlling the emission state and light intensity of blue light and red (green) light. The display panel (display device) provided by the application can improve resolution and can be applied to an LCD.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal display technology and micro-nano optical devices, specifically to a display device that uses a color filter grating to improve resolution. Background Technology

[0002] Currently, in the display field, the common full-color technology divides each pixel unit into three sub-pixels with the three primary colors placed side by side. By adjusting the brightness of each sub-pixel, the color of the entire pixel unit can be adjusted.

[0003] The resolution of a liquid crystal display (LCD) is measured by pixel density, which depends on the physical size of the display and the number of pixels. Smaller pixel sizes can provide higher resolution.

[0004] In traditional liquid crystal displays (LCDs), the arrangement of liquid crystal molecules is controlled by an electric field to display images. However, due to limitations in the structural characteristics of liquid crystal molecules and the constraints of the driving circuit control board, the resolution of LCDs is somewhat limited, and cannot fully meet the demands for high pixel density and high definition. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background technology and provide a display device that uses a color filter grating to improve resolution, enabling a single sub-pixel unit to emit light of two colors or a mixture thereof.

[0006] To achieve the above objectives, the technical solution of the present invention is: a display device that improves resolution by using a color filter grating, which achieves full-color display by adopting a double-layer liquid crystal structure. With the cooperation of the rotating liquid crystal device and the color filter grating composite structure in the lower layer of the double-layer liquid crystal structure, a single sub-pixel unit emits light of two colors or a mixture of colors.

[0007] In one embodiment of the present invention, the display device includes a light guide plate backlight, upper and lower polarizers, two liquid crystal optical adjustment layers, and a color filter grating composite structure located in the two liquid crystal optical adjustment layers; the light guide plate backlight and the lower polarizer are used to provide polarized light incident on all optical structures; the upper polarizer and the two liquid crystal optical adjustment layers are used to control the light intensity of the emitted light.

[0008] In one embodiment of the present invention, the liquid crystal optical adjustment layer includes a plurality of adjustment units, each adjustment unit corresponding to a sub-pixel electrode, and the polarization direction of the linearly polarized light incident on each optical structure is adjusted by controlling the voltage of the sub-pixel electrode.

[0009] In one embodiment of the present invention, the color filter grating composite structure includes a plurality of sub-pixel grating structure units, each sub-pixel grating structure unit corresponds to a light-emitting part, and each light-emitting part includes an adjustment part of each of the upper and lower liquid crystal optical adjustment layers and a corresponding sub-pixel grating structure unit.

[0010] In one embodiment of the present invention, the color filter grating structure adopts a metal nano grating, including a composite structure unit of two wavelength color filter gratings with mutually perpendicular line grating directions, which constitutes a sub-pixel in the display device.

[0011] In one embodiment of the present invention, each pixel has two sub-pixel grating structure units, which respectively control the emission state and intensity of blue light and red / green light.

[0012] In one embodiment of the present invention, the sub-pixel grating structure unit includes two nano-metal gratings with mutually perpendicular line grating directions, namely a blue metal color filter grating and a red / green metal color filter grating.

[0013] In one embodiment of the present invention, each nano-metal grating only allows TM light to be transmitted perpendicular to the grating direction.

[0014] In one embodiment of the present invention, each pixel includes two sub-pixels, and each sub-pixel includes a corresponding sub-pixel grating structure unit and a corresponding adjustment part of each of the upper and lower liquid crystal optical adjustment layers.

[0015] In one embodiment of the present invention, the display device is applied to an LCD.

[0016] Compared to existing technologies, this invention offers the following advantages: This invention employs a dual-liquid crystal structure to achieve full-color display, providing a resolution-enhancing display device for use in LCDs. A light guide plate and a lower polarizer enable the emission of three colors of light under linear polarization. By rotating liquid crystal devices in the lower liquid crystal layer, the TE wave mode or TM wave mode relative to the lower polarizer is selectively activated according to the control of the switching electric field of a single sub-pixel TFT. A color filter grating structure can be used to transmit red (green) light in the TE wave mode and blue light in the TM wave mode, respectively. This allows a single sub-pixel unit to emit light of two colors or a mixture thereof. The upper liquid crystal adjustment layer and the upper polarizer (analyzer) are designed to control the intensity of the emitted light. Through the synergistic effect of the two adjustment layers, the emission and intensity of light of different wavelengths are controlled, achieving full-color display. Since each pixel of the display panel (display device) only has two sub-pixels to achieve full-color display, compared to traditional display panels with three sub-pixels per pixel, it is easier to improve resolution. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the region division of the pixel unit of the display device in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the display device provided in the embodiment of the present invention;

[0019] Figure 3 yes Figure 2 A schematic diagram illustrating the principle of a display device when displaying a blue image;

[0020] Figure 4 yes Figure 2 A schematic diagram illustrating the principle of a display device when displaying a green image;

[0021] Figure 5 yes Figure 2 A schematic diagram illustrating the principle of the display device when displaying a red image;

[0022] Figure 6 yes Figure 2 A schematic diagram illustrating the principle of a display device when displaying a yellow image;

[0023] Figure 7 yes Figure 2 A schematic diagram illustrating the principle of a display device when displaying a cyan image;

[0024] Figure 8 yes Figure 2 A schematic diagram illustrating the principle of the display device when displaying a purple image;

[0025] Figure 9 yes Figure 2 A schematic diagram illustrating the principle of a display device when displaying a white image;

[0026] Figure 10 This is a schematic diagram of a blue-green color filter grating unit;

[0027] Figure 11 This is a schematic diagram of a blue-red color filter grating unit;

[0028] The attached figures are labeled as follows:

[0029] Pixel unit: 10, blue-green sub-pixel; 11, blue-red sub-pixel;

[0030] Display device (display panel): 20, polarizer; 30, blue-green color filter grating unit; 31, blue-red color filter grating unit; 40, liquid crystal optical adjustment layer; 50, light guide plate backlight. Detailed Implementation

[0031] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] This invention provides a display device that improves resolution using a color filter grating. It achieves full-color display by employing a dual-layer liquid crystal structure. Through the cooperation of a rotating liquid crystal device and a color filter grating composite structure in the lower layer of the dual-layer liquid crystal structure, a single sub-pixel unit emits light of two colors or a mixture thereof. The display device includes a light guide plate backlight, upper and lower polarizers, two liquid crystal optical adjustment layers, and a color filter grating composite structure located within the two liquid crystal optical adjustment layers. The light guide plate backlight and lower polarizer provide polarized light incident on all optical structures; the upper polarizer and the two liquid crystal optical adjustment layers control the intensity of the emitted light.

[0033] The following are specific implementation examples of the present invention.

[0034] like Figure 1 , 2 As shown, the present invention provides a display device, including a light guide plate backlight 50, a lower polarizer 20, and a color filter grating composite structure disposed on one side between two liquid crystal optical adjustment layers 40, as well as an upper polarizer 20 serving as an analyzer. The color filter grating structure includes a blue metal color filter grating and a green (red) metal color filter grating with mutually perpendicular line directions.

[0035] like Figure 10 , 11 As shown, the color filter grating composite structure includes a blue-green color filter grating unit 30 and a blue-red color filter grating unit 31.

[0036] When the display panel (display device) provided by this invention displays light, the light from the backlight of the light guide plate is incident on the lower polarizer and becomes linearly polarized light. The linearly polarized light is then converted into different polarization directions by the first liquid crystal optical adjustment layer. The gratings act differently on light with different polarization directions incident on the color filter grating composite structure, thereby changing the wavelength of the light incident on the second liquid crystal optical adjustment layer. The polarizers on the second liquid crystal optical adjustment layer work together, and the adjustment section in each liquid crystal optical adjustment layer adjusts the transmittance of the linearly polarized light.

[0037] For a liquid crystal optical adjustment layer, when the polarization direction of the linearly polarized light after passing through the color filter grating composite structure is the same as the polarization direction of the adjustment section in the liquid crystal optical adjustment layer, the emitted light energy is high. When the polarization direction of the linearly polarized light after passing through the color filter grating composite structure is perpendicular to the polarization direction of the adjustment section in the liquid crystal optical adjustment layer, no light is emitted. When the polarization direction of the linearly polarized light after passing through the color filter grating composite structure intersects with but is not perpendicular to the polarization direction of the adjustment section in the liquid crystal optical adjustment layer, since this part of the light has two polarization components, the emitted light color is a mixture of the colors of the two color filter gratings. The emitted light after polarization direction adjustment corresponds to either the color of a single color filter grating or a mixture of several colors. Therefore, by adjusting the polarization direction of the light using the adjustment sections in multiple liquid crystal optical adjustment layers at corresponding positions, the desired color can be obtained.

[0038] Figure 3 yes Figure 2 A schematic diagram illustrating the principle of a display device when displaying a blue image; Figure 4 yes Figure 2 A schematic diagram illustrating the principle of a display device when displaying a green image; Figure 5 yes Figure 2 A schematic diagram illustrating the principle of the display device when displaying a red image; Figure 6 yes Figure 2 A schematic diagram illustrating the principle of a display device when displaying a yellow image; Figure 7 yes Figure 2 A schematic diagram illustrating the principle of a display device when displaying a cyan image; Figure 8 yes Figure 2 A schematic diagram illustrating the principle of the display device when displaying a purple image; Figure 9 yes Figure 2 A schematic diagram illustrating the principle of a display device when displaying a white image.

[0039] The above are preferred embodiments of the present invention. Any changes made to the technical solution of the present invention that do not exceed the scope of the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. A display device that utilizes a color filter grating to improve resolution, characterized in that, Full-color display is achieved by employing a dual-layer liquid crystal structure. With the cooperation of a rotating liquid crystal device and a color filter grating composite structure in the lower layer of the dual-layer liquid crystal structure, a single sub-pixel unit emits light of two colors or a mixture thereof. The device includes a light guide plate backlight, upper and lower polarizers, two liquid crystal optical adjustment layers, and a color filter grating composite structure located within the two liquid crystal optical adjustment layers. The light guide plate backlight and lower polarizer provide polarized light incident on all optical structures; the upper polarizer and the two liquid crystal optical adjustment layers control the intensity of the emitted light; the liquid crystal optical adjustment layers include multiple adjustment sections. Each adjustment unit corresponds to a sub-pixel electrode, and the polarization direction of the linearly polarized light incident on each optical structure is adjusted by controlling the voltage of the sub-pixel electrode; the color filter grating composite structure includes multiple sub-pixel grating structure units, each sub-pixel grating structure unit corresponds to a light-emitting unit, and each light-emitting unit includes one adjustment unit in each of the upper and lower liquid crystal optical adjustment layers and one corresponding sub-pixel grating structure unit; each pixel includes two sub-pixels, and each sub-pixel includes one corresponding sub-pixel grating structure unit and one adjustment unit in each of the upper and lower liquid crystal optical adjustment layers.

2. The display device for improving resolution using a color filter grating according to claim 1, characterized in that, The color filter grating structure is a metal nanograting.

3. A display device for improving resolution using a color filter grating according to claim 1, characterized in that, Each pixel has two sub-pixel grating structure units, which control the emission state and intensity of blue and red light, and blue and green light, respectively.

4. A display device for improving resolution using a color filter grating according to claim 1 or 3, characterized in that, The sub-pixel grating structure unit includes two nano-metal gratings with mutually perpendicular line directions, namely a blue metal color filter grating and a red metal color filter grating, and a blue metal color filter grating and a green metal color filter grating.

5. A display device for improving resolution using a color filter grating according to claim 4, characterized in that, Each nano-metal grating allows only TM light to be transmitted perpendicular to the grating direction.

6. A display device for improving resolution using a color filter grating according to claim 1, characterized in that, This display device is used in LCDs.

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