Light-Emitting Module Brightness Uniformity
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Solution Overview
Problem
Variation in brightness distribution on target surfaces in light-emitting modules due to the condition of the optical system, which affects the uniformity and quality of displayed images in applications like reflective LCDs and head-up displays.
Innovation Solution
A light-emitting module design that includes a light-emitting plate with distinct regions of peak luminous intensity and a reflecting member, where light from these regions is directed to specific areas of the target surface, with controlled optical distances and orientations to maintain uniform brightness, using a configuration that can include organic EL elements and a controlling circuit to manage light emission timing for field sequential color displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional optical system is used in light-emitting modules, then the structure is simple, but variation in brightness distribution occurs on the target surface
Solution Approach 1:
The patent applies local quality by creating distinct light emission regions with different peak luminous intensities on the light-emitting plate. Specifically, a first region emits light with a first peak luminous intensity while a second region emits light with a second peak luminous intensity, allowing different parts of the optical system to have optimized local characteristics that collectively achieve uniform brightness distribution on the target surface.
Solution Approach 2:
The patent employs parameter changes by varying the peak luminous intensity values across different regions of the light-emitting plate. By controlling the light distribution parameters (peak luminous intensity) in different regions and coordinating with corresponding optical distances to the target surface, the system compensates for brightness variations and achieves uniform illumination.
2Illumination intensity
If regions with different peak luminous intensity are used, then brightness uniformity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent uses parameter changes by establishing specific relationships between optical distances and peak luminous intensities. The optical distance from the first region to the target surface is made greater than the optical distance from the second region to the target surface, while the first peak luminous intensity is made higher than the second peak luminous intensity. This coordinated parameter adjustment compensates for distance-related brightness attenuation and achieves uniform illumination.
3Illumination intensity
If the optical distance is increased for higher luminous intensity regions, then brightness distribution is balanced, but the device design flexibility is reduced
Solution Approach 1:
The patent applies local quality by dividing the light-emitting plate into multiple regions with locally optimized characteristics. Each region has a specific peak luminous intensity and corresponding optical distance configuration, allowing the system to achieve uniform brightness distribution while maintaining design flexibility through localized parameter optimization rather than uniform system-wide constraints.
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 inhibits variation in brightness distribution, ensuring consistent and uniform illumination across the target surface, enhancing image quality and design flexibility in various display applications.
Implementation Method 1
a reflecting member having a reflecting surface to reflect light emitted from the light-irradiating surface of the light-emitting plate toward a target surface of an object
Data Source
AI summary
Light (light (L1)) at peak luminous intensity in a light distribution of a first region (12a) of a light-irradiating surface (12) is sent to a first region (32a) of a target surface (32) via a first region (22a) of a reflecting surface (22). Light (light (L2)) at peak luminous intensity in a light distribution in a second region (12b) of the light-irradiating surface (12) is sent to a second region (32b) of the target surface (32) via a second region (22b) of the reflecting surface (22). An optical distance from the first region (12a) of the light-irradiating surface (12) to the first region (32a) of the target surface (32) via the first region (22a) of the reflecting surface (22) is greater than an optical distance from the second region (12b) of the light-irradiating surface (12) to the second region (32b) of the target surface (32) via the second region (22b) of the reflecting surface (22). The luminous intensity of the light (L1) is higher than the luminous intensity of the light (L2).