Display Panel and Display Device

A display panel and a display device are provided. The display panel includes: a first substrate, including a plurality of pixel units, each pixel unit including a plurality of sub-pixels with different colors; a second substrate, disposed opposite to the first substrate; and a light splitting film, configured to decompose white light incident thereon into a plurality of monochromatic lights which respectively correspond to the plurality of sub-pixels of each pixel unit in color and respectively project the plurality of monochromatic lights onto the plurality of sub-pixels of each pixel unit.

TECHNICAL FIELD

Embodiments of the present disclosure relate to a display panel and a display device.

BACKGROUND

A Thin Film Transistor-Liquid Crystal Display (TFT-LCD) has advantages of low radiation, small size, low energy consumption, etc., and is thus widely applied to electronic products such as a laptop computer, a Personal Digital Assistant (PDA), a flat-screen television or a mobile phone.

The TFT-LCD comprises a display panel and a backlight source; the display panel includes an opposed substrate, an array substrate and a liquid crystal layer disposed between the opposed substrate and the array substrate, and the opposed substrate or the array substrate is provided with a color filter (CF). The color filter is made of resin generally, and, for example, comprises a red color filter, a green color filter and a blue color filter, so as to filter white light emitted by the backlight source. Light rays, consistent with the corresponding color of the color filter, in the white light can be transmitted by the color filter, and light rays, inconsistent with the corresponding color of the color filter, in the white light is absorbed by the color filter. For example, red light in the white backlight is transmitted through the red color filter, green light in the white backlight is transmitted through the green color filter and blue light in the white backlight is transmitted through the blue color filter. It can be seen that for the white light emitted by the backlight source, only a small part of the light can be transmitted through the display panel; as a result, a utilization rate of the light from the backlight is low.

SUMMARY

According to embodiments of the disclosure, a display panel is provided. The display panel comprises: a first substrate, including a plurality of pixel units, each pixel unit including a plurality of sub-pixels with different colors; a second substrate, disposed opposite to the first substrate; and a light splitting film, configured to decompose white light incident thereon into a plurality of monochromatic lights which respectively correspond to the plurality of sub-pixels of each pixel unit in color and respectively project the plurality of monochromatic lights onto the plurality of sub-pixels of each pixel unit.

For example, the display panel further comprises a wire grating polarizer, and the wire grating polarizer is disposed between the light splitting film and the first substrate or the light splitting film is disposed between the wire grating polarizer and the first substrate.

For example, the light splitting film includes a plurality of light splitting microstructures, and the light splitting microstructures are sin gratings.

For example, the light splitting microstructures are uniformly distributed in the light splitting film.

For example, a placement angle of each light splitting microstructure in the light splitting film meets the following formula group:

αq=α+qλΛcosθG;βq=β+qλΛsinθG;γq=(1-αq2-βq2)1/2;where λ is a wavelength of a monochromatic light to be decomposed from an incident light of the light splitting film, Λ is a period of a sine curve corresponding to the sin grating, α is an included angle between the incident light of the light splitting film and an X axis, β is an included angle between the incident light of the light splitting film and a Y axis, αqis an included angle between an emergent light of the light splitting film and the X axis, βqis an included angle between the emergent light of the light splitting film and the Y axis, γqis an included angle between the emergent light of the light splitting film and a Z axis, θGis an included angle between the placement angle of the light splitting microstructure in the light splitting film and the X axis, and q is an order of the light splitting microstructure.

For example, a distance from the light splitting microstructure to its corresponding sub-pixel is in direct proportion to a width of the sub-pixel, and a distance from the light splitting film to its corresponding sub-pixels is in direct proportion to a tangential value of an included angle between the light splitting film and an emergent light of the light splitting film.

For example, the distance from the light splitting microstructure to its corresponding sub-pixel meets the following formula:

h=l*tanewhere h is the distance from the light splitting microstructure to its corresponding sub-pixel, l is a width of two sub-pixels in the pixel unit, and e is the included angle between the emergent light of the light splitting film and a plane where the light splitting film is.

For example, the display panel further comprises a liquid crystal layer and an upper polarizer of which an optical axis is perpendicular to that of the wire grating polarizer; the liquid crystal is disposed between the first substrate and the second substrate; and the upper polarizer is disposed on a surface of the second substrate facing away from the first substrate.

For example, the display panel further comprises a liquid crystal layer, and an upper polarizer and a lower polarizer of which optical axes are perpendicular to each other. The liquid crystal layer is disposed between the first substrate and the second substrate. The upper polarizer is disposed on a surface of the second substrate facing away from the first substrate, and the lower polarizer is disposed on a surface of the light splitting film facing away from the first substrate; or the upper polarizer is disposed on the surface of the second substrate facing away from the first substrate, and the lower polarizer is disposed between the light splitting film and the first substrate.

For example, neither the first substrate nor the second substrate is provided with a color filter.

According to the embodiments of the disclosure, a display device is provided. The display device comprises the display panel as described above.

DETAILED DESCRIPTION

Referring toFIG. 1, embodiments of the present disclosure provide a display panel, and the display device comprises: a first substrate1, including a plurality of pixel units, each pixel unit including a plurality of sub-pixels with different colors (for example, each pixel unit includes a first sub-pixel11, a second sub-pixel12and a third sub-pixel13respectively corresponding to different monochromatic lights); a second substrate2, disposed opposite to the first substrate1; and a light splitting film3. The light splitting film3is disposed on a surface of the first substrate1facing away from the second substrate2, the light splitting film3is configured to decompose white light20incident thereon into a plurality of monochromatic lights which respectively correspond to the plurality of sub-pixels of each pixel unit in color and respectively project the plurality of monochromatic lights onto the plurality of sub-pixels of each pixel unit (for example, the light splitting film3is configured to decompose the white light20incident thereon into the monochromatic lights which respectively correspond to the first sub-pixel11, the second sub-pixel12and the third sub-pixel13in color and respectively project the monochromatic lights onto the first sub-pixel11, the second sub-pixel12and the third sub-pixel13).

For example, the white light20is incident from a surface of the light splitting film20facing away from the first substrate1. For example, the white light20is provided by a backlight source.

For example, the first sub-pixel11, the second sub-pixel12and the third sub-pixel13are a red sub-pixel, a green sub-pixel and a blue sub-pixel respectively, or sub-pixels of other colors capable of realizing display, which is not limited by the embodiments of the present disclosure. In a case that the first sub-pixel11, the second sub-pixel12and the third sub-pixel13are the red sub-pixel, the green sub-pixel and the blue sub-pixel respectively, a first monochromatic light, a second monochromatic light and a third monochromatic light that the light splitting film3decomposes from the white light20are a red light, a green light and a blue light respectively, and the light splitting film3projects the decomposed red light onto the red sub-pixel, the decomposed green light onto the green sub-pixel and the decomposed blue light onto the blue sub-pixel.

In the embodiments of the present disclosure, the light splitting film3decomposes the white light20incident thereon to obtain the monochromatic lights corresponding to respective sub-pixels (for example, the first sub-pixel11, the second sub-pixel12and the third sub-pixel13), and correspondingly provides the decomposed monochromatic lights to the sub-pixels, in this way, the white light is fully used, and the case that the light rays in the white light20inconsistent with the sub-pixels in color are blocked is avoided, such that loss caused by filtering the white light20provided by the backlight source is reduced, and a light utilization rate is improved.

For example, as shown inFIG. 2, the display panel further includes a wire grating polarizer4, and the wire grating polarizer4is disposed between the light splitting film3and the first substrate1. In the case that the wire grating polarizer4is adopted, the wire grating polarizer4and the light splitting film3for example are prepared by adopting a same process apparatus (for example, a same etching apparatus), and a process cost is reduced. In addition, a manufacturing precision of the wire grating polarizer4is higher than a polarizer attached by a traditional attachment process, such that the manufacturing precision of the whole display panel is improved. It should be noted that as shown inFIG. 2, the wire grating polarizer4is disposed between the light splitting film3and the first substrate1; however, the embodiments of the present disclosure are not limited thereto, the wire grating polarizer4for example is disposed on a surface of the light splitting film3facing away from the first substrate1, that is, the light splitting film3is disposed between the first substrate1and the wire grating polarizer4.

In order to understand the light splitting film3more clearly, the light splitting film3is described below in detail in combination withFIGS. 3-5.

For example, as shown inFIG. 3, the light splitting film3comprises a plurality of light splitting microstructures, and the light splitting microstructures are, for example, sin gratings. Λ is a period of a sine curve corresponding to the sin grating, and a normal P of the sine curve is perpendicular to a plane where the sin grating is. In order to uniformize intensities of the monochromatic lights provided by the light splitting film3, for example, the plurality of light splitting microstructures are uniformly distributed in the light splitting film3.

As shown inFIG. 4, a placement angle of the light splitting microstructure in the light splitting film3meets the following formulas 1-3:

Where λ is wavelength of a monochromatic light to be decomposed from incident light of the light splitting film3(i.e., a wavelength of a monochromatic light to be decomposed from the incident white light20, for example, a wavelength of a red light in the incident white light20, a wavelength of a green light in the incident white light20, or a wavelength of a blue light in the incident white light20), Λ is a period of the sine curve of the sin grating, α is an included angle between the incident light of the light splitting film3and an X axis, β is an included angle between the incident light of the light splitting film3and a Y axis, αqis an included angle between an emergent light of the light splitting film3and the X axis, βqis an included angle between the emergent light of the light splitting film3and the Y axis, γqis an included angle between the emergent light of the light splitting film3and a Z axis, θGis an included angle between the placement angle of the light splitting microstructure in the light splitting film3and the X axis, and q is an order of the light splitting microstructure. It can be seen from the formulas 1-3 described above that by adjusting the placement angle of the light splitting microstructure, the light having a certain wavelength λ is emergent along a specific direction (determined by αq, βqand γq), such that the light splitting film3has a light splitting function and is capable of projecting separated monochromatic lights onto corresponding sub-pixels.

For example, one monochromatic light beam having one color is separated from the light splitting microstructure having the placement angle θG, and such monochromatic light beam is projected onto one or more sub-pixels corresponding to the monochromatic light in color. For example, a plurality of monochromatic light beams with the same color are separated from multiple light splitting microstructures having the placement angle θG, and the plurality of monochromatic light beams with the same color are projected onto the one or more sub-pixels corresponding to the monochromatic light in color.

For example, a distance from the light splitting microstructure to its corresponding sub-pixel is in direct proportion to a width of the sub-pixel, and a distance from the light splitting film3to its corresponding sub-pixels is in direct proportion to a tangential value of an included angle between the light splitting film3and emergent light of the light splitting film3. It should be noted that the distance from the light splitting microstructure to the corresponding sub-pixel can be understood as the distance from the light splitting film3to a surface of the first substrate1facing the second substrate2.

For example, referring toFIG. 5, the distance from the light splitting microstructure to the corresponding sub-pixel meets the following formula (4):

Where h is the distance from the light splitting microstructure to the corresponding sub-pixel, l is a width of two sub-pixels, and e is an included angle between the emergent light of the light splitting film3and a plane where the light splitting film3is.

For example, as shown inFIG. 6, the display panel further comprises a liquid crystal layer5and an upper polarizer7of which an optical axis is perpendicular to that of the wire grating polarizer4; the liquid crystal5layer is disposed between the first substrate1and the second substrate2; and the upper polarizer7is disposed on a surface of the second substrate2facing away from the first substrate1. It should be noted that as shown in the drawing, if the wire grating polarizer4is not disposed, then a lower polarizer of which an optical axis is perpendicular to that of the upper polarizer7is required to be disposed on the surface of the first substrate1facing away from the second substrate2, and the lower polarizer is disposed on the surface of the light splitting film facing away from the first substrate or the lower polarizer is disposed between the light splitting film and the first substrate.

For example, the first substrate1is an array substrate, the second substrate2is an opposed substrate, and the first substrate1and the second substrate2is provided with a color filter or is not be provided with the color filter. In order to obtain a higher light transmittance, for example, neither of the first substrate1nor the second substrate2is provided with the color filter. In the embodiments of the present disclosure, the monochromatic lights obtained by the light splitting film3decomposing the white light provided by the backlight source unnecessarily pass through the color filter, and thus the light transmittance is improved.

As shown inFIG. 6, the embodiments of the present disclosure further provide a display device, comprising a backlight module100and the display panel200provided by the embodiments described above.

The foregoing embodiments merely are exemplary embodiments of the disclosure, and not intended to define the scope of the disclosure, and the scope of the disclosure is determined by the appended claims.

The application claims priority of Chinese Patent Application No. 201610012168.3 filed on Jan. 8, 2016, the disclosure of which is incorporated herein by reference in its entirety as part of the present application.