RGB Backlight Unit Cell Layout for Lower Voltage Loss
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Solution Overview
Problem
Existing display apparatuses experience voltage loss and reduced lifespan of red, green, and blue light emitting diodes due to different driving voltages within a common voltage block in local dimming systems.
Innovation Solution
The display apparatus drives red, green, and blue light emitting diodes with high voltage and low current, forming a single light emitting diode group where the number of red diode cells exceeds green and blue diode cells, and includes at least one cell between anode and cathode pads, with shared power feeding pads for each diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If red, green, and blue light emitting diodes are driven by a common voltage within each block of the local dimming system, then the device complexity is reduced and ease of operation is improved, but voltage loss occurs and the lifespan and color stability of the light emitting diodes deteriorate
Solution Approach 1:
The patent segments the local dimming system into multiple independent voltage blocks, where each block contains red, green, and blue light emitting diodes that share a common voltage supply. This segmentation allows different voltage levels to be applied to different blocks, reducing voltage loss while maintaining ease of operation through modular design.
Solution Approach 2:
The patent implements local quality by allowing different voltage characteristics in different regions (blocks) of the display. Each block can have optimized voltage parameters tailored to its specific light emitting diode configuration, thereby reducing voltage loss and improving lifespan and color stability without compromising overall system ease of operation.
2Loss of energy
If the number of red light emitting diode cells is increased to compensate for higher voltage requirements, then the voltage loss is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the display into multiple voltage blocks, distributing the voltage management across several smaller units rather than requiring one complex high-voltage system. This reduces manufacturing complexity while effectively managing voltage loss through localized optimization.
Solution Approach 2:
The patent changes the voltage parameter distribution across different blocks, optimizing the number of light emitting diode cells in each block based on local voltage requirements. This allows flexible parameter adjustment that reduces voltage loss without uniformly increasing device complexity across the entire display.
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 reduces voltage loss and enhances the lifespan and color stability of the light emitting diodes, improving the display's contrast ratio and power efficiency.
Implementation Method 1
The light sources include light emitting diodes (LEDs)
Data Source
AI summary
There is provided is a display apparatus including a liquid crystal panel and a backlight unit configured to provide light to the liquid crystal panel. The backlight unit includes a substrate, a red light emitting diode mounted on a first surface of the substrate, a green light emitting diode mounted on the first surface of the substrate and a blue light emitting diode mounted on the first surface of the substrate. Each of the red light emitting diode, the green light emitting diode, and the blue light emitting diode includes at least two cells.