Field Sequential LCD Backlight Control Circuit Size Reduction
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Solution Overview
Problem
Conventional field sequential liquid crystal display devices require large circuits to control backlight brightness for each area, leading to increased size and power consumption.
Innovation Solution
A field sequential liquid crystal display device with a field sequential processing unit that generates backlight data based on a representative value for each pixel, reducing the amount of calculation needed for backlight brightness control and incorporating a frame rate conversion unit to improve display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If separate light emission patterns are obtained for each color component data (R, G, B) for each partial light emitting area, then backlight brightness control for each area is achieved, but circuit size increases
Solution Approach 1:
The patent merges the processing of multiple color component data (R, G, B) into a unified light emission pattern. Instead of separately obtaining light emission patterns for each color component, the system combines them into a single integrated pattern that controls the backlight for each partial light emitting area, thereby reducing circuit size while maintaining brightness control functionality.
Solution Approach 2:
The patent creates a universal light emission pattern that serves multiple color components simultaneously. This single pattern is used to control the backlight across different color channels (R, G, B), making the circuit multi-functional and eliminating the need for separate processing circuits for each color component.
2Manufacturing precision
If multiple fields (white, red, green, blue) are displayed to reduce color breakup, then display quality improves, but drive frequency increases
Solution Approach 1:
The patent employs periodic action by displaying multiple fields (white, red, green, blue) in sequential time division within one frame period. The liquid crystal panel alternates between different color fields at high frequency, utilizing the persistence of vision to create a complete color image, thereby achieving high display quality through periodic field switching.
Solution Approach 2:
The system dynamically controls the backlight and liquid crystal panel to switch between different color fields within each frame period. By adaptively adjusting which light sources are active during each field period and coordinating with liquid crystal switching, the system achieves high-quality color display while managing the drive frequency requirements.
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 reduces the size of the circuit for backlight brightness control and minimizes color breakup by generating multiple field data pieces, allowing for efficient power management and reduced drive frequency, thereby lowering costs and improving display quality.
Implementation Method 1
a liquid crystal panel which has a plurality of pixels arranged two-dimensionally; a backlight which includes a plurality of types of light sources having different emission colors
Implementation Method 2
a backlight including a plurality of types of light sources having different emission colors, each of the types including a plurality of light sources
Implementation Method 3
displays three fields of red, green, and blue in one frame period. When the red field is to be displayed, a liquid crystal panel is driven based on red video data, and the red light source emits light
Data Source
AI summary
A field sequential processing unit 11 includes a representative value calculating unit 111 configured to obtain a representative value for each pixel based on video data Ri, Gi, and Bi, a backlight data generating unit 112 configured to generate backlight data Xb indicating brightness of LEDs 18 in each area of the backlight 17 based on the obtained representative value, a video data correcting unit 113 configured to correct the video data Ri, Gi, and Bi based on the backlight data Xb, and a field data generating unit 114 configured to generate four pieces of field data Wf, Rf, Gf, and Bf based on the corrected video data Rc, Gc, Bc. By generating the backlight data based on the representative value for each pixel, it is possible to reduce a size of a circuit for obtaining brightness of the backlight for each area.