Light Source Device Optical Sheet Spacer Uniform Luminance
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Solution Overview
Problem
Current liquid crystal display devices face challenges in achieving uniform luminance and preventing hot spots due to the directivity of inorganic light-emitting elements, which can lead to localized high luminance regions and reduced display quality.
Innovation Solution
A light source device design that includes a housing body with a light source substrate, inorganic light-emitting elements, an optical sheet, and a spacer, where the optical sheet is positioned to maintain a distance from the light source substrate and has a structure that diffuses and directs light uniformly, preventing overlap with the spacer to ensure even illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If inorganic light-emitting elements are used directly on the light source substrate, then the device structure is simplified, but non-uniform luminance and hot spots occur due to directivity
Solution Approach 1:
A resin layer is introduced as an intermediary between the inorganic light-emitting elements and the light source substrate. This resin layer has a refractive index matched to the light-emitting elements, which reduces light reflection at the interface and improves light extraction efficiency. The resin layer also serves as a bonding layer that securely attaches the light-emitting elements to the substrate, maintaining structural simplicity while achieving uniform luminance distribution.
2Length of stationary object
If the optical sheet is placed close to the light source substrate, then the device thickness is reduced, but hot spots and non-uniform luminance occur
Solution Approach 1:
The optical sheet is designed with locally differentiated structures including a light-blocking portion that corresponds to the electrode regions of the liquid crystal display module. This light-blocking portion prevents light from reaching the electrode areas, thereby avoiding hot spots in those regions. The optical sheet maintains close proximity to the light source substrate for thinness while the localized light-blocking features ensure uniform luminance distribution across the display area.
3Ease of manufacture
If the optical sheet structure is simplified, then manufacturing is easier, but hot spots occur due to insufficient light diffusion
Solution Approach 1:
The optical sheet is designed to perform multiple functions simultaneously: it acts as a light-diffusing element to eliminate hot spots, a light-blocking element to protect electrode regions, and a structural component that maintains the desired spacing between the light source and display module. By integrating these multiple functions into a single optical sheet component, manufacturing complexity is minimized while achieving uniform luminance distribution through its light-diffusing properties.
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
The solution provides uniform luminance to the liquid crystal display module, reducing hot spots and enhancing display quality by diffusing and directing light effectively, while also allowing for a thinner display device with reduced component count.
Implementation Method 1
an optical sheet located over the plurality of inorganic light-emitting elements, accommodated in the housing body, and spaced away from the light source substrate
Implementation Method 2
a plurality of inorganic light-emitting elements over the light source substrate
Data Source
AI summary
Provided is a light source device including: a housing body; a light source substrate located over and accommodated in the housing body; a plurality of inorganic light-emitting elements over the light source substrate; an optical sheet located over the plurality of inorganic light-emitting elements, accommodated in the housing body, and spaced away from the light source substrate; and at least one spacer accommodated in the housing body and in contact with a bottom surface of the optical sheet. A region of an upper surface of the light source substrate overlapping the plurality of inorganic light-emitting elements does not overlap the at least one spacer.