Display Device Light Directing Unit Polarized Light Illumination
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Solution Overview
Problem
Display devices using resin-based light guide plates suffer from reduced luminance, non-uniformity, and color shift due to light absorption and material deformation from heat, load, and moisture, leading to suboptimal display quality.
Innovation Solution
A display device structure that eliminates the use of a light guide plate by directing polarized light from a light source unit directly onto a light directing unit, which includes prism portions to refract and reflect light perpendicularly to the liquid crystal layer, enhancing luminance uniformity and color accuracy without wavelength-dependent absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a resin-based light guide plate is used to transmit light from the light source to the display panel, then light transmission is achieved, but luminance is reduced and non-uniformity occurs due to light absorption
Solution Approach 1:
The patent removes the resin-based light guide plate from the optical path entirely. Instead of using a light guide plate to transmit light, the invention uses a light source unit with light-emitting elements positioned to directly illuminate the display panel, eliminating the intermediate light transmission component that causes absorption losses.
Solution Approach 2:
The patent introduces a light directing unit with prism portions as an intermediary component. These prisms redirect light from the light source unit at specific angles to ensure uniform illumination of the display panel, replacing the function of the light guide plate without the associated absorption problems.
2Illumination intensity
If a resin-based light guide plate is used, then light transmission is achieved, but color shift occurs due to wavelength-dependent absorption
Solution Approach 1:
The patent removes the resin-based light guide plate that causes wavelength-dependent absorption. By directly positioning light-emitting elements to illuminate the display panel without intermediate resin materials, the invention eliminates the source of color shift while maintaining color accuracy.
3Illumination intensity
If a light guide plate is used, then light transmission is achieved, but non-uniformity occurs due to material deformation from heat, load, and moisture
Solution Approach 1:
The patent removes the light guide plate that is susceptible to deformation from heat, load, and moisture. By eliminating this intermediate component and using direct illumination from the light source unit, the invention avoids the reliability issues associated with material deformation while maintaining uniform luminance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances display quality by preventing luminance reduction, non-uniformity, and color shift, while broadening the viewing angle and improving luminance through the use of phosphor layers and reflection layers, resulting in improved image clarity and brightness.
Implementation Method 1
a light directing unit facing substantially the whole surface of the first substrate of the display panel, and including a first main surface disposed on a side facing the first substrate, and a second main surface disposed on a side reverse to the first main surface; wherein the polarized light is made incident on the first main surface or the second main surface of the light directing unit, and directed perpendicularly to the optical element layer
Implementation Method 2
a light directing unit facing substantially the whole surface of the first substrate of the display panel, and including a first main surface disposed on a side facing the first substrate, and a second main surface disposed on a side reverse to the first main surface
Data Source
AI summary
According to one embodiment, a display device includes a display panel including a first substrate, a second substrate, and an optical element layer provided between the substrates, a light directing unit facing the first substrate of the display panel, and including a first main surface disposed on a side facing the first substrate, and a second main surface disposed on a side reverse to the first main surface, and a light source unit disposed on the first substrate side with respect to the display panel, and emitting polarized light toward the first or second main surface. The polarized light is made incident on the first or second main surface, and directed perpendicularly to the optical element layer.