Light Guide Display Timing Control for Uniform Luminance
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Solution Overview
Problem
Existing display devices face challenges in achieving uniform luminance and display quality, particularly when using high-directionality light sources like laser diodes, which can lead to non-uniformity in color mixing and luminance across the display area.
Innovation Solution
A controller is employed to individually control the lighting times of light emitting elements, with those farther from the center of the light guide having shorter lighting cycles than those closer to the center, ensuring synchronized light source control signals are supplied to maintain uniformity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-directionality light sources like laser diodes are used, then light efficiency and brightness are improved, but non-uniformity in color mixing and luminance across the display area increases
Solution Approach 1:
The patent applies local quality by varying the lighting time of individual light emitting elements based on their position relative to the light guide. Elements farther from the light guide have shorter lighting times than those closer to it, creating position-dependent control that compensates for the high-directionality characteristic of laser diodes and achieves uniform luminance across the display area.
2Manufacturing precision
If light emitting elements are controlled with different lighting times, then luminance uniformity is improved, but control system complexity increases
Solution Approach 1:
The patent implements parameter changes by adjusting the lighting time parameter of each light emitting element according to its position. The controller varies the duty cycle or on-time of each element to compensate for positional differences in light propagation distance, achieving uniform luminance through parameter optimization rather than complex structural modifications.
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 approach enhances display quality by minimizing non-uniformity in luminance and improving color mixing, especially with laser diodes, while optimizing light emitting elements' operation for maximum efficiency.
Implementation Method 1
The light emitted from the light source is made incident on the light guide, propagates the inside of the light guide, and is emitted from an emission surface of the light guide
Data Source
AI summary
According to one embodiment, a display device includes a display panel, a light guide having a side surface, and a light source unit facing the side surface, and a controller. The light source unit includes a plurality of first light emitting elements arranged along the side surface to emit light of the same color. When a period from the time when the light source unit is turned on until the time when the light source unit is turned on again is referred to as one cycle, the controller controls a lighting time per one cycle of one first light emitting element which is located farther from a center of the side surface, of two adjacent first light emitting elements, to be shorter than a lighting time per one cycle of the other first light emitting element.