Liquid crystal grating and display device

A display device, comprising a light source, at least one liquid crystal grating, and a spatial light modulator located between the light source and the at least one liquid crystal grating, wherein the at least one liquid crystal grating is configured to modulate incident light beams of a plurality of colors, wherein the light beams comprise first color light;

• each of the at least one liquid crystal grating comprises a first substrate, a liquid crystal layer and a second substrate, the liquid crystal layer is located between the first substrate and the second substrate, and the liquid crystal layer comprises a plurality of liquid crystal molecules;
• and
• each of the at least one liquid crystal grating satisfies:
• Δn1×d<λ1,
• wherein Δn1 denotes a refractive index difference of birefringence of the plurality of liquid crystal molecules corresponding to the first color light, d denotes a thickness of the liquid crystal layer along a direction perpendicular to a plane on which the first substrate is located, and λ1 denotes a center wavelength of the first color light;
• wherein the light source is configured to chronologically emit each light beam of the coherent light beams of the plurality of colors;
• wherein the spatial light modulator is configured to perform at least one of a phase modulation or an amplitude modulation on the light beams;
• the light beams further comprise second color light, and a center wavelength of the second color light is less than the center wavelength of the first color light;
• the spatial light modulator comprises at least one liquid crystal module, each of the at least one liquid crystal module comprises a first sub-pixel and a second sub-pixel, the first sub-pixel is configured to transmit the first color light, and the second sub-pixel is configured to transmit the second color light;
• and
• the at least one liquid crystal module satisfies that a transmittance of the first color light within the first sub-pixel is greater than a transmittance of the second color light within the second sub-pixel.

A display device, comprising a light source and at least one liquid crystal grating, wherein the at least one liquid crystal grating is configured to modulate incident light beams of a plurality of colors, wherein the light beams comprise first color light;

• each of the at least one liquid crystal grating comprises a first substrate, a liquid crystal layer and a second substrate, the liquid crystal layer is located between the first substrate and the second substrate, and the liquid crystal layer comprises a plurality of liquid crystal molecules;
• and
• each of the at least one liquid crystal grating satisfies:
• 0.85λ1<Δn1×d<0.95λ1,
• wherein Δn1 denotes a refractive index difference of birefringence of the plurality of liquid crystal molecules corresponding to the first color light, d denotes a thickness of the liquid crystal layer along a direction perpendicular to a plane on which the first substrate is located, and λ1 denotes a center wavelength of the first color light;
• wherein the light source is configured to chronologically emit each light beam of the coherent light beams of the plurality of colors.