Reflective Sheet Light Conversion Dots for Display Luminance Uniformity
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Solution Overview
Problem
Thin display apparatuses face optical defects such as unevenness due to the miniaturization of light sources and increased number of light sources, leading to luminance inconsistencies across the display.
Innovation Solution
A display apparatus design incorporating a reflective sheet with strategically positioned holes and light conversion dots, where the number and size of light conversion dots vary around each hole to adjust the luminance and color ratio, reducing blue light intensity at the edges and corners to match the central portion, thereby eliminating optical defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the number of light sources is increased and light sources are miniaturized to reduce display apparatus thickness, then the thickness of the display apparatus is reduced, but optical defects such as unevenness and luminance inconsistencies occur
Solution Approach 1:
The patent applies local quality by differentiating the arrangement of light conversion dots based on their position relative to holes in the reflective sheet. Light conversion dots are selectively positioned around specific holes (first, second, and third holes) with different numbers and configurations, creating localized optical corrections that address position-dependent luminance variations while maintaining overall display uniformity
Solution Approach 2:
The light conversion dots serve as intermediaries between the blue light sources and the final displayed image. These dots convert blue light to other wavelengths and are strategically positioned around holes in the reflective sheet to mediate and balance the luminance distribution, transforming the harmful edge/corner brightness into uniform illumination across the display surface
2Length of stationary object
If light sources are miniaturized and densely arranged, then the display apparatus becomes thinner, but blue light intensity becomes uneven across the display surface
Solution Approach 1:
The patent implements local quality by creating position-specific light conversion dot arrangements around different holes in the reflective sheet. The first light conversion dots around the first hole, second light conversion dots around the second hole, and third light conversion dots around the third hole are configured with different numbers and positions, providing localized control over blue light conversion to achieve uniform illumination intensity across the entire display surface
Solution Approach 2:
The patent applies parameter changes by varying the number, position, and configuration of light conversion dots around different holes. By changing these parameters locally around specific holes rather than using a uniform arrangement, the patent optimizes blue light conversion efficiency and distribution, transforming the non-uniform blue light intensity into consistent illumination across the display
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 effectively reduces blue light intensity at the edges and corners, ensuring uniform luminance and color across the display, eliminating optical defects and enhancing user experience by maintaining consistent image quality.
Implementation Method 1
a plurality of light conversion dots including a plurality of first light conversion dots, a plurality of second light conversion dots, and a plurality of third light conversion dots
Data Source
AI summary
A display apparatus includes a liquid crystal panel; light sources configured to emit blue light; and a reflective sheet including a first edge portion and a second edge portion, wherein a plurality of holes are disposed on the reflective sheet, the plurality of holes includes a first hole, a second hole, and a third hole. The first hole is disposed at a first distance from an edge of the first edge portion, the second hole is disposed at the first distance from an edge of the second edge portion, and the third hole is disposed at a second distance from the edge of the first edge portion. The display apparatus further includes first light conversion dots disposed around the first hole, second light conversion dots disposed around the second hole, and third light conversion dots disposed around the third hole.