Annular LED Backlight with Flexible No-Wiring Board
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in maintaining uniform brightness due to variations in the radial dimension of the light guide member caused by manufacturing errors and thermal expansion/contraction, leading to positional relationship issues between the light guide plate and light sources.
Innovation Solution
A lighting device with a light source board featuring a no-wiring formed region that allows for deformation without affecting power feeding, combined with a light guide plate and light sources arranged in an annular and curved shape, ensuring a uniform positional relationship and minimizing brightness variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light guide plate and light sources are disposed with precise positional relationships to ensure uniform brightness, then display quality is improved, but manufacturing complexity and cost increase due to stringent tolerance requirements
Solution Approach 1:
The light source board is designed with flexibility to dynamically adapt its shape through elastic deformation. This allows the board to automatically adjust and maintain optimal positional relationships between light sources and light guide plate without requiring extremely tight manufacturing tolerances, thus resolving the contradiction between brightness uniformity and manufacturing precision requirements
Solution Approach 2:
The invention changes the physical state of the light source board from rigid to flexible by selecting materials with appropriate elastic moduli. This parameter change enables the board to deform and adapt to dimensional variations in the light guide plate, maintaining uniform light distribution without demanding high manufacturing precision
2Stability of the object's composition
If the light source board is made rigid to maintain structural stability, then manufacturing and assembly are simplified, but brightness variations occur due to inability to accommodate thermal expansion and manufacturing errors
Solution Approach 1:
The light source board transitions from a static rigid structure to a dynamic flexible structure that can elastically deform. This enables the board to maintain structural integrity while adapting to thermal expansion and manufacturing variations, simultaneously achieving structural stability and brightness uniformity
Solution Approach 2:
The flexible light source board accommodates thermal expansion and contraction of the light guide plate through elastic deformation. The board's flexibility allows it to expand and contract with temperature changes without compromising the positional relationship between light sources and the light guide plate, preventing brightness variations
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 suppresses brightness variations by allowing the light source board to absorb deformation, maintaining consistent power feeding and positional relationships, resulting in improved display quality.
Implementation Method 1
The light source board includes a no-wiring formed region in a part thereof with respect to a circumferential direction, the wiring portion being not formed in the no-wiring formed region. Accordingly, even when the light source board is deformed so as to entirely contract or expand, the deformation can be absorbed or permitted by the no-wiring formed region
Implementation Method 2
a light guide plate surrounded by the plurality of light sources and having an outer shape along an arrangement of the plurality of light sources, the light guide plate being configured to guide light from the plurality of light sources
Data Source
AI summary
A backlight device 12 includes at least: a plurality of LEDs 17 arranged in an annular and curved shape; a light guide plate 14 surrounded by the plurality of LEDs 17 having am outer shape along the arrangement of the plurality of LEDs 17, and guiding light from the plurality of LEDs 17; and an LED board (light source board) 18 on which the plurality of LEDs 17 are mounted and wiring portions 18c for feeding power to the plurality of LEDs 17 are formed. The LED board 18 extends along the arrangement of the plurality of LEDs 17, and has a terminated annular shape or an endless annular shape, and includes a no-wiring formed region NWA in a part with respect to the circumferential direction thereof, where the wiring portions 18c are not formed.