Backlight Segmentation with Groove Gaps for Display Light Leakage
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Solution Overview
Problem
In display devices using local dimming technology, particularly in liquid crystal displays, the challenge is to achieve high definition and contrast while preventing light leakage between segments, which is exacerbated by the difficulty in setting multiple LEDs in smaller segments and the visibility of single LEDs, leading to non-uniform luminance distribution and light leakage through diffusion sheets.
Innovation Solution
The implementation of a display device with a backlight that includes a light source substrate divided into segments, where at least one LED is disposed in each segment, covered by a transparent resin with a groove-like gap along the segment borders, and a light guide between the optical sheet group and the transparent resin, which reduces light leakage by reflecting light at the interface between the transparent resin and the groove-like gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the segment size is made smaller to improve local dimming control precision, then the definition and contrast are improved, but it becomes difficult to set multiple LEDs in one segment and the LED becomes visible from the screen side
Solution Approach 1:
The patent divides the backlight unit into multiple segments corresponding to different display regions, allowing independent light control in each segment. This segmentation enables precise local dimming control while maintaining the ability to arrange LEDs appropriately within each segment's boundaries.
Solution Approach 2:
The patent introduces a vertical dimension by forming a groove-like gap that extends downward from the upper surface of the transparent resin. This three-dimensional structure effectively separates light from adjacent segments without requiring larger horizontal spacing, thus maintaining small segment sizes while preventing light leakage.
2Device complexity
If only one LED is set in each segment to simplify the structure, then the device complexity is reduced, but there arises a problem of uniformity in luminance distribution and the LED becomes visible from the screen side
Solution Approach 1:
The patent applies different structural characteristics to different regions: the groove-like gap is formed specifically at boundaries between segments where light isolation is needed, while the center regions maintain uniform transparent resin for even light distribution. This localized structural differentiation resolves both the visibility issue and the uniformity requirement.
Solution Approach 2:
The groove-like gap acts as an intermediary light-blocking structure between adjacent LED-containing segments. It prevents direct light leakage from one segment to another while allowing each LED to maintain its intended luminance distribution within its own segment.
3Manufacturing precision
If a diffusion sheet is set to counter the LED visibility problem, then the luminance distribution uniformity is improved, but light in the segment leaks to neighboring segments through the influence of the diffusion sheet
Solution Approach 1:
The groove-like gap is formed in advance within the transparent resin structure, creating light-isolating barriers before light propagation occurs. This preliminary structural arrangement prevents light leakage at segment boundaries while allowing diffusion sheets to be positioned elsewhere for luminance uniformity without causing cross-segment light leakage.
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
This configuration effectively minimizes light leakage to adjacent segments, enabling more accurate local dimming and maintaining uniform brightness, thus enhancing the display's contrast and definition without compromising brightness uniformity.
Implementation Method 1
a groove like gap is formed in the transparent resin along a border between the segments
Data Source
AI summary
The purpose of the present invention is to realize a display device of high definition and high contrast by applying an accurate local dimming. The structure of the invention is as follows. A display device including: a display panel and a back light, in which the back light includes a light source and an optical sheet group, the light source includes a light source substrate and LEDs disposed on the light source substrate, the light source is divided into segments in a plan view, at least one of the LEDs is disposed in a segment, the light source substrate and the LEDs are covered by a transparent resin, and a groove like gap is formed in the transparent resin along a border between the segments.