Display Device Light Redirection Optical Elements
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Solution Overview
Problem
Conventional non-self-luminous display devices, such as liquid crystal display devices, face inefficiencies in light utilization due to the design of polarizing plates, which can limit the effectiveness of light emission and image display.
Innovation Solution
The implementation of a display device configuration that includes a light providing assembly, a display panel with a first and second substrate, a liquid crystal layer, and polarizing plates with grid polarizing layers, along with first and second optical elements that redirect light from non-pixel regions to pixel regions, enhancing light efficiency and frontal brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional polarizing plates are used in display devices, then the device structure is simple, but light efficiency is limited
Solution Approach 1:
The optical element is segmented into multiple regions: a first region with a first refractive index and a second region with a second refractive index different from the first. This segmentation allows different portions of light from non-pixel regions to be redirected along different paths, improving overall light efficiency while maintaining a relatively simple integrated structure.
Solution Approach 2:
Different regions of the optical element are assigned different refractive indices to optimize local light redirection. The first region redirects light in a first direction while the second region redirects light in a second direction, allowing tailored optimization for different light paths without increasing overall device complexity.
2Manufacturing precision
If light shielding layer is added to block light in non-pixel regions, then image quality improves, but light loss increases
Solution Approach 1:
Instead of simply blocking light in non-pixel regions with a light shielding layer (which would cause light loss), the patent converts this potentially harmful light into beneficial light by using optical elements to redirect it toward pixel regions. The light that would otherwise be wasted is now utilized to enhance image display, thereby improving image quality without increasing light loss.
Solution Approach 2:
The optical element acts as an intermediary between the light shielding layer and the pixel regions. It captures light that would be blocked or wasted in non-pixel regions and redirects it toward the pixel regions, mediating between the conflicting requirements of image quality and light efficiency.
3Productivity
If optical elements with different refractive indices are used, then light redirection efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple optical functions into a single optical element by integrating regions with different refractive indices within one component. This allows light redirection in multiple directions to be achieved through one manufactured part rather than requiring multiple separate components, thereby improving light redirection efficiency while managing manufacturing complexity.
Solution Approach 2:
The optical element is designed with multi-functionality, serving both as a structural component and as a light redirection element. By incorporating regions with different refractive indices within a single element, it performs multiple light redirection functions simultaneously, improving overall system efficiency without proportionally increasing manufacturing complexity.
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 increases light efficiency and improves frontal brightness by effectively redirecting light from non-pixel regions to pixel regions, thereby enhancing the display's ability to utilize emitted light for image display.
Implementation Method 1
The first optical element is configured to redirect a fraction of the light propagating toward the non-pixel region in a first direction
Implementation Method 2
The second optical element is configured to redirect the fraction of light propagating in the first direction toward the pixel region
Implementation Method 3
polarizing plates to polarize incident light emitted from the backlight assembly
Data Source
AI summary
A display device includes a light providing assembly to provide light, and a display panel to display an image using the light. The display panel includes a first substrate (FS), a second substrate (SS), a liquid crystal layer (LCL), a polarizing plate (PP), a first optical element (FOE), and a second optical element (SOE). The FS includes a pixel region (PR) and a non-PR (NPR) adjacent to the PR. The SS faces the FS. The LCL is disposed between the FS and SS. The PP is disposed between the FS and LCL, and includes grid polarizing layers. The FOE is disposed between the FS and PP, and is configured to redirect a fraction of the light propagating toward the NPR in a first direction. The SOE is disposed between the FOE and PP, and is configured to redirect the fraction of light propagating in the first direction toward the PR.