Edge Type Light Source Module Brightness Compensation
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Solution Overview
Problem
Current direct type backlight source modules with local dimming technology suffer from insufficient brightness reduction, leading to non-smooth image edges, which can be mitigated by increasing the number of local regions, but this increases cost and drive complexity.
Innovation Solution
An edge type light source module with stacked light emitting devices and brightness compensation, where light leakage regions have adjusted brightness values to improve image smoothness and contrast, using the formulae L2′=L2−(L1*k1*R1) and L4′=L4−(L3*k2*R2) for brightness compensation, and L6′=L5*R3 and L7′=L5*R4 for specific leakage regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of local regions in direct type backlight source module is increased to improve image edge smoothness, then image quality is improved, but cost and drive complexity increase
Solution Approach 1:
The patent transitions from a two-dimensional planar backlight structure to a three-dimensional stacked structure by placing a first edge type backlight source and a second edge type backlight source at different depths (different z-axis positions). This spatial dimensionality change allows independent control of light leakage from each layer, achieving smooth image edges without requiring excessive segmentation of single-layer regions.
Solution Approach 2:
The patent divides the backlight system into multiple independent controllable regions by stacking separate edge type backlight sources. Each backlight source can be independently controlled to compensate for light leakage in specific areas, achieving fine-grained brightness control that improves image edge smoothness while maintaining manageable drive complexity through modular design.
2Manufacturing precision
If brightness compensation is performed using stacked edge type light emitting devices, then image edge smoothness is improved, but device structure complexity increases
Solution Approach 1:
The patent implements a nested structure where a first edge type backlight source and a second edge type backlight source are stacked one above another, with each layer contributing to different aspects of light emission and leakage control. This nested arrangement allows compact integration of multiple light emitting elements without significantly increasing overall device footprint, achieving smooth image edges with controlled structural complexity.
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 edge type light source module achieves smoother image edges and improved dynamic image fluency by performing brightness compensation, enhancing the contrast and display quality compared to conventional direct type modules.
Implementation Method 1
a first edge type light emitting device and a second edge type light emitting device. A light generated by the first edge type light emitting device is emitted from the middle light emitting region. The second edge type light emitting device and the first edge type light emitting device are stacked together, and a light generated by the second edge type light emitting device is emitted from the edge light emitting region
Implementation Method 2
If the middle light emitting region is a lighting region having a brightness value of L1, the edge light emitting region adjacent to the lighting region is a light leakage region. The light leakage region has a predetermined brightness value of L2, and a compensation brightness value (L2′) of the light leakage region satisfies L2′=L2−(L1*k1*R1)
Data Source
AI summary
An edge type light source module has at least one middle light emitting region and edge light emitting region and includes a first edge type light emitting device and a second edge type light emitting device. If the middle light emitting region is a lighting region having a brightness value L1, the edge light emitting region adjacent to the lighting region is a light leakage region. The light leakage region has a predetermined brightness value L2, and a compensation brightness value L2′ of the light leakage region satisfies L2′=L2−(L1*k1*R1), 0≦k1≦1, and 20%≦R1≦60%. If the edge light emitting region is a lighting region having a brightness value L3, the middle light emitting region adjacent to the lighting region is a light leakage region. The light leakage region has a predetermined brightness value L4, and a compensation brightness value L4′ of the light leakage region satisfies L4′=L4−(L3*k2*R2), 0≦k2≦1, and 10%≦R2≦50%.