Display Device Through-Hole Luminance Uniformity via Light Shielding
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Solution Overview
Problem
Conventional liquid crystal display devices with through-holes, such as those for watch hands, suffer from non-uniform luminance due to differences in light exposure, leading to increased bezel size when attempting to address these issues with LED modules.
Innovation Solution
A display device design featuring a liquid crystal panel with a through-hole, a light guide plate with a matching through-hole, and a transparent fastener with flat surfaces and reflectors to align and direct light uniformly, reducing bezel size and enhancing luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a through-hole is provided in the liquid crystal panel for watch hands, then the display device can support physical buttons or rotating hands, but non-uniform luminance occurs around the through-hole due to differences in light exposure
Solution Approach 1:
The patent applies local quality by providing a light-shielding layer specifically at the rear surface of the light guide plate corresponding to the through-hole region. This local modification creates a light-shielding portion that selectively blocks light in the dark region, compensating for the luminance deficiency only where needed while leaving other regions unaffected. The light-shielding layer is positioned and sized to match the specific luminance non-uniformity pattern around the through-hole.
2Illumination intensity
If LED modules are added to address luminance non-uniformity around the through-hole, then luminance uniformity improves, but the bezel size increases
Solution Approach 1:
The patent merges the light-shielding function with the existing light guide plate structure by integrating a light-shielding layer directly onto the rear surface of the light guide plate. This consolidation eliminates the need for separate LED modules that would require additional bezel space. The light-shielding portion is formed as part of the light guide plate assembly, achieving luminance correction without increasing the overall device footprint.
Solution Approach 2:
The patent extracts the light-shielding function from the proposed LED module solution and implements it directly on the light guide plate. By removing the need for separate LED modules and their associated control circuits, the design achieves luminance uniformity correction while maintaining a compact bezel size. The light-shielding layer is applied only to the necessary region around the through-hole, minimizing material and space requirements.
3Illumination intensity
If a light-shielding layer is added to the light guide plate, then luminance uniformity around the through-hole improves, but the device complexity increases
Solution Approach 1:
The patent employs composite materials by combining the light guide plate material with a light-shielding layer having different optical properties. The light-shielding layer is made of a material that selectively absorbs or blocks light in specific wavelengths or directions, creating a composite structure that simultaneously performs light guiding and light shielding functions. This material composite approach achieves luminance uniformity correction without requiring complex mechanical or electronic systems.
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 achieves uniform luminance around the through-hole, reducing the dark region size and improving image quality while minimizing bezel size, compared to conventional designs.
Implementation Method 1
a light guide plate configured to provide back light to the liquid crystal panel, the light guide plate formed with a second through-hole; a plurality of light sources configured to radiate light, the plurality of light sources positioned along a side of the light guide plate, the light guide plate configured to direct the light from the plurality of light sources towards an upper side of the light guide plate
Implementation Method 2
a fastener including a body that is at least partially transparent and a head, a cross-section of the body being smaller than the second through-hole and a cross-section of the head being larger than the second through-hole, the fastener formed with a longitudinal hole penetrating the body and the head, the body inserted into the second through-hole to transmit a portion of the light from the plurality of light sources through the body of the fastener
Implementation Method 3
A display device design featuring a liquid crystal panel with a through-hole, a light guide plate with a matching through-hole, and a transparent fastener with flat surfaces and reflectors to align and direct light uniformly
Data Source
AI summary
A display device is configured such that a through-hole extends through a liquid crystal panel and a light guide plate, a fastener for coupling the hands of a watch is coupled to the through-hole, and the formation of a dark region is prevented due to interference between the fastener and light from a light source around the through-hole. At least one flat side surface for minimizing interference with the light from the light source is provided on the fastener, whereby uniform luminance is provided around the through-hole.