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US 11,693,173 B2Granted
Optical composite sheet and display device comprising same
AssigneeSK Microworks Solutions Co., Ltd.
InventorsKyoo Choong Cho, Tae Hoon Kim, Yong Jae Choe, Jae Ho Ko
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Abstract
An optical composite sheet is disclosed. In the optical composite sheet, optical functional elements such as a prism sheet and a light diffusion layer are combined, and a light absorbing layer that selectively absorbs light of a specific wavelength band is inserted, so that the optical performance and color gamut can be enhanced as compared with the prior art. In particular, the color transmittance of the optical composite sheet with respect to wavelength measured for each viewing angle satisfies a specific relationship, whereby it is possible to effectively reduce the color deviation with respect to the viewing angle.
Claims10
An optical composite sheet, which comprises:
- a prism sheet;
- a light diffusion layer disposed under the prism sheet;
- and
- a light absorbing layer disposed on the prism sheet, between the prism sheet and the light diffusion layer, or under the light diffusion layer,
- wherein the following Relationship (1) is satisfied:
- 0.5≤(TPeak_0−TPeak_60)/(T450_0−T450_60)≤1.5 (1)
- in Relationship (1),
- TPeak_0 (front absorption peak) is lowest value among color transmittances measured in a direction perpendicular to a plane direction of the prism sheet,
- TPeak_60 (lateral absorption peak) is lowest value among color transmittances measured in a direction at an angle of 60° to the perpendicular direction,
- T450_0 (front blue transmittance) is color transmittance at a wavelength of 450 nm measured in the perpendicular direction, and
- T450_60 (lateral blue transmittance) is color transmittance at a wavelength of 450 nm measured in the 60° direction;
- in order to measure the color transmittance of the front blue transmittance and the color transmittance of the lateral blue transmittance, a light source that emits white light with a continuous emission spectrum is prepared, a spectral intensity (L1) of light from the optical composite sheet is measured when light from the light source passes through the optical composite sheet, a reference sheet is prepared by removing the light absorbing layer from the optical composite sheet, a spectral intensity (L0) of light from the optical composite sheet is measured when light from the light source passes through the reference sheet, and the color transmittance of the front blue transmittance and the color transmittance of the lateral blue transmittance are each a value obtained by dividing L1 by L0.
9 more elements
A display device, which comprises:
- a light source;
- an optical composite sheet into which light from the light source is incident;
- and
- a display panel into which light from the optical composite sheet is incident,
- wherein the optical composite sheet comprises a prism sheet;
- a light diffusion layer disposed under the prism sheet;
- and a light absorbing layer disposed on the prism sheet, between the prism sheet and the light diffusion layer, or under the light diffusion layer,
- and the following Relationship (1) is satisfied:
- 0.5≤(TPeak_0−TPeak_60)/(T450_0−T450_60)≤1.5 (1)
- in Relationship (1),
- TPeak_0 (front absorption peak) is lowest value among color transmittances measured in a direction perpendicular to a plane direction of the prism sheet,
- TPeak_60 (lateral absorption peak) is lowest value among color transmittances measured in a direction at an angle of 60° to the perpendicular direction,
- T450_0 (front blue transmittance) is color transmittance at a wavelength of 450 nm measured in the perpendicular direction, and
- T450_60 (lateral blue transmittance) is color transmittance at a wavelength of 450 nm measured in the 60° direction;
- in order to measure the color transmittance of the front blue transmittance and the color transmittance of the lateral blue transmittance, a light source that emits white light with a continuous emission spectrum is prepared, a spectral intensity (L1) of light from the optical composite sheet is measured when light from the light source passes through the optical composite sheet, a reference sheet is prepared by removing the light absorbing layer from the optical composite sheet, a spectral intensity (L0) of light from the optical composite sheet is measured when light from the light source passes through the reference sheet, and the color transmittance of the front blue transmittance and the color transmittance of the lateral blue transmittance are each a value obtained by dividing L1 by L0.
12 more elements
Dependencies are inferred from the claim text.