Reflective Region Layout for LCD Backlight Edge Brightness
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Solution Overview
Problem
Existing lighting devices for liquid crystal displays experience brightness unevenness, particularly at the outer peripheral edge and corner portions, due to a lower number of light-emitting elements and reduced light propagation in these areas.
Innovation Solution
A lighting device design featuring a reflection member with a lattice pattern of reflective regions, where outer regions have smaller areas and steeper wall angles, and outer LEDs are positioned closer to the edge with potentially higher power, luminous flux, or lower voltage to enhance light directionality and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a uniform lattice pattern of reflective regions is used in the reflection member, then light directionality is improved, but brightness unevenness occurs at outer peripheral regions
Solution Approach 1:
The patent applies local quality by making the reflective regions have different areas based on their position: outer peripheral reflective regions have smaller areas while inner reflective regions have larger areas. This non-uniform design compensates for the reduced light propagation from peripheral light-emitting elements, thereby improving brightness uniformity across the display while maintaining the lattice pattern structure for light directionality.
2Device complexity
If the number of light-emitting elements is reduced at outer peripheral regions, then device complexity is reduced, but brightness decreases at outer peripheral regions
Solution Approach 1:
The patent maintains a uniform arrangement of light-emitting elements across the entire display area, including outer peripheral regions. The brightness compensation is achieved not by increasing the number of peripheral light-emitting elements, but by adjusting the area of reflective regions associated with them. This approach avoids increasing device complexity while still improving peripheral brightness through the non-uniform reflective region design.
3Ease of manufacture
If all reflective regions have the same area, then manufacturing is simplified, but brightness unevenness occurs due to reduced light propagation from peripheral elements
Solution Approach 1:
The patent implements local quality by defining reflective regions with position-dependent areas. The reflection member is designed so that outer peripheral reflective regions have smaller areas while inner reflective regions have larger areas. This can be achieved through standard manufacturing processes by defining different region boundaries, thus maintaining ease of manufacture while effectively compensating for brightness unevenness through the non-uniform reflective region areas.
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 design effectively curbs brightness unevenness by increasing light intensity at the outer peripheral regions, resulting in more uniform brightness across the display.
Implementation Method 1
a reflecting wall having a horizontal portion with insertion holes through which a plurality of light-emitting elements are individually inserted, and an inclined portion surrounding each of the light-emitting elements inserted into the insertion holes
Data Source
AI summary
A lighting device includes a plurality of light sources disposed side by side in a row direction and a column direction in one plane, a substrate on which the plurality of light sources are mounted, and a reflection member disposed covering the mounting surface of the substrate. The reflection member includes a plurality of insertion holes through which the light sources are respectively inserted, and a plurality of wall portions surrounding corresponding insertion holes of the plurality of insertion holes. A plane of the reflection member is partitioned into a plurality of reflective regions by the plurality of wall portions. The plurality of light sources are respectively disposed inside the reflective regions. An outer reflective region located at an outer periphery among the plurality of reflective regions has an area smaller than the area of an inner reflective region located on the inner side of the outer reflective region.