Direct Backlight Lens Layout for Uniform LCD Luminance
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Solution Overview
Problem
Direct-type backlight modules in LCD devices face issues with uneven luminance due to bright regions over LEDs and dim regions between them, necessitating increased LED usage, which raises manufacturing costs.
Innovation Solution
A backlight module design featuring a substrate with LED light sources arranged at the corners of a rectangle, each paired with a lens that directs light to achieve uniform luminance across a rectangular area, using lenses to adjust light propagation angles and reduce the number of LEDs required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If more LEDs are used to improve luminance uniformity, then luminance uniformity is improved, but manufacturing cost increases
Solution Approach 1:
A lens is introduced as an intermediary component between the LED and the display panel. The lens modifies the light propagation path and distribution, enabling a single LED to achieve uniform luminance across a larger area. This mediator allows the system to maintain luminance uniformity without increasing the number of LEDs, thereby reducing manufacturing cost while preserving the desired optical performance
Solution Approach 2:
The patent changes the optical parameters of light propagation by using a lens with specific focal length and aperture characteristics. By adjusting the light distribution pattern through optical parameter modification, the system achieves uniform luminance coverage from fewer LEDs, transforming the light intensity distribution parameter from concentrated to uniform across the display area
2Illumination intensity
If more LEDs are used to improve luminance uniformity, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The lens serves as a simplifying intermediary that consolidates the optical function of multiple LEDs into a single LED system. Instead of adding more light sources and their associated mounting structures, wiring, and control circuits, the patent introduces a single optical element that achieves the same luminance uniformity effect, thereby reducing overall device complexity
Solution Approach 2:
The lens performs multiple functions simultaneously: it collimates light from the LED, distributes light uniformly across the display panel, and defines the illumination area. This multi-functionality replaces what would otherwise require multiple LEDs and complex optical systems, simplifying the overall device architecture while maintaining luminance uniformity
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
Achieves uniform luminance without increasing the number of LEDs, potentially eliminating the need for a diffuser and reducing manufacturing costs while enhancing display efficiency.
Implementation Method 1
A first LED light source of the four LED light sources includes a first LED and a first lens disposed above the first LED. The first lens directs light rays emitted from the first LED onto
Data Source
AI summary
A display device includes a display panel, a light source on a substrate, and an adjacent light source. The adjacent light source is spaced apart from the light source by a predetermined distance. The light source emits light to irradiate an interface between the substrate and a member of the display panel via a lens. Light emitted from the light source irradiates a spot on the interface via the lens with luminance below a darkness level. The spot is aligned with the adjacent light source in a direction perpendicular to the substrate.