Display Apparatus Subpixel and Light Source Driver Control
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Solution Overview
Problem
Liquid crystal display apparatuses face challenges in reducing power consumption while maintaining display quality, particularly in efficiently managing light sources to minimize color breakup and luminance delays.
Innovation Solution
The display apparatus employs a panel with subpixels of primary colors and a transparent subpixel, driven by a light source system that alternates between different colored light sources, such as red, green, and blue LEDs, to optimize power usage and prevent color breakup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single white light source is used continuously, then the display can maintain consistent luminance, but power consumption increases and color accuracy deteriorates due to energy loss in the color filter
Solution Approach 1:
The patent applies periodic action by alternately turning on red, green, and blue light sources in sequential subframes rather than using a continuous white light source. This periodic activation of colored LEDs reduces overall power consumption while maintaining perceived luminance through temporal integration by the human eye
Solution Approach 2:
The patent segments the white light source into multiple colored LED sources (red, green, blue) that are activated separately in different subframes. This segmentation allows each LED to operate at lower power while collectively providing the full spectrum needed for display, reducing total energy consumption compared to a single high-power white LED
2Use of energy by moving object
If colored light sources are alternately activated, then power consumption is reduced, but color breakup may occur due to liquid crystal response delays
Solution Approach 1:
The patent applies preliminary action by pre-charging the liquid crystal molecules during the first subframe before the actual color display subframe. This pre-positioning of liquid crystal molecules ensures they are ready to quickly respond to the colored LED activation, preventing color breakup and maintaining color consistency despite the alternating light source activation
Solution Approach 2:
The patent maintains continuity of useful action by overlapping the liquid crystal response time with the light source activation sequence. The liquid crystal molecules are kept in a charged state across subframe boundaries, ensuring continuous and smooth color transition without visible breakup or flicker, even though the light sources are activated discontinuously
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 significantly reduces power consumption while enhancing display quality by effectively managing light source usage and compensating for liquid crystal response delays, resulting in improved color consistency and reduced power expenditure.
Implementation Method 1
a light source part which provides light to the display panel, where the light source includes a first light source and a second light source having colors different from each other
Data Source
AI summary
A display apparatus includes a display panel including a first subpixel having a first primary color, a second subpixel having a second primary color; and a transparent subpixel; a panel driver which sets grayscale data of the first subpixel, the second subpixel and the transparent subpixel; a light source part which provides light to the display panel, where the light source comprises a first light source and a second light source having colors different from each other; and a light source driver which turns on the first light source during a first subframe, turns on the second light source during a second subframe, and turns on the first light source during a third subframe, and a first frame comprises the first subframe, the second subframe and the third subframe.