Backlight Module Brightness Uniformity via Resistance Compensation
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Solution Overview
Problem
Conventional mini-LED backlight modules exhibit lower brightness in combining areas due to larger intervals between mini-LEDs, affecting display quality.
Innovation Solution
A backlight module with combined backplanes, where first light-emitting units in combining areas have a smaller resistance to the power source high-potential signal input terminal than second light-emitting units in other areas, with a driving chip adjusting resistance values to equalize brightness by querying or calculating resistance compensation values from a table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple backplanes are combined to form large-size displays, then the display size is increased, but the brightness in combining areas becomes lower due to larger intervals between mini-LEDs
Solution Approach 1:
The patent applies local quality by differentiating the resistance values for light-emitting units in combining areas versus inner areas. Specifically, the first resistance for light-emitting units in combining areas is set to be smaller than the second resistance for light-emitting units in inner areas, creating localized electrical property differences that compensate for the larger physical intervals in combining areas, thereby equalizing brightness across the entire display surface.
2Illumination intensity
If resistance compensation is implemented to equalize brightness, then brightness uniformity is improved, but device complexity increases due to additional control circuits and resistance adjustment mechanisms
Solution Approach 1:
The patent implements parameter changes by adjusting the resistance values in the electrical connection paths of light-emitting units based on their location. The driving chip dynamically modifies resistance parameters (first resistance for combining areas, second resistance for inner areas) to compensate for brightness differences, achieving uniform illumination without requiring complex mechanical or structural modifications to the backlight module.
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 solution enhances the overall brightness of first light-emitting units in combining areas to match that of second light-emitting units in other areas, improving display effect by reducing seam shadows and maintaining energy efficiency.
Implementation Method 1
each of the plurality of backplanes is provided with a plurality of light-emitting units arranged in an array, and the light-emitting units are electrically connected to a power source high-potential signal input terminal and a power source low-potential signal input terminal, for emitting light under control of a power source high-potential signal and a power source low-potential signal
Data Source
AI summary
A backlight module and a display device having same are provided in the present disclosure. The backlight module includes a plurality of backplanes that are combined, where a plurality of light-emitting units are disposed. Each of the light-emitting units includes a first light-emitting unit located in the combining areas of the adjacent backplanes, and a second light-emitting unit located in the other areas of the backplanes. In at least one backplane, a first resistance between the first light-emitting unit and the corresponding power source high-potential signal input terminal is smaller than a second resistance between the second light-emitting unit and the corresponding power source high-potential signal input terminal.