Field Sequential Color Display Reducing Color Breakup
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Solution Overview
Problem
Field sequential color (FSC) display devices suffer from the color breakup (CBU) phenomenon, particularly at the edges of images, due to pixels being projected onto different positions on the retina, leading to misplacement of color fields.
Innovation Solution
A display method that involves receiving an input image, performing color separation and filtering processes to generate intensity and edge images, followed by pure color analysis to create and display different pure color coarse images and edge images at specific time periods, effectively reducing the CBU phenomenon by displaying these images sequentially.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If field sequential color display emits red, green, and blue light at specific times using different light sources, then the device saves internal space and reduces cost, but color breakup phenomenon occurs at image edges due to pixel projection misalignment on the retina
Solution Approach 1:
The patent segments the image processing into multiple components: intensity image, edge image, color coarse image, and pure color analysis results. By separating these elements and processing them independently with different switching frequencies, the system achieves precise color field alignment while maintaining the space-saving benefits of FSC display structure
Solution Approach 2:
The patent employs periodic action by displaying different image components (intensity, edge, color) at different switching frequencies. The edge image is updated at a lower frequency while pure color information is updated at higher frequencies, creating a periodic refresh pattern that prevents color breakup while maintaining overall image quality
2Speed
If pixels corresponding to three colors are projected onto different positions on the retina, then the display device can operate at high switching speeds exceeding human perception, but the user observes color field separation and misplacement
Solution Approach 1:
The patent applies local quality by treating different spatial regions and color components with different processing frequencies. Edge regions are processed at lower frequencies while central regions and pure color information use higher frequencies, ensuring that each region receives appropriate refresh rates to prevent color breakup while maintaining high overall switching speed
Solution Approach 2:
The patent changes the switching frequency parameter dynamically based on the image component being displayed. By adjusting the refresh rate for different components (intensity, edge, color) and using pure color analysis to determine optimal switching parameters, the system maintains high switching speeds while achieving precise color field alignment
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 method effectively reduces the color breakup phenomenon at the edges of images by displaying different pure color and edge images at distinct times, enhancing image quality and minimizing color field separation.
Implementation Method 1
Because the switch speed of the FSC display device exceeds the perceiving frequency of human eyes (i.e., 60 Hz), the human brain may superpose all the images because of the persistence of vision, enabling a user to percept a full-color display.
Data Source
AI summary
A display method includes: receiving an input signal; performing a color separation process on the input image to generate color information and an intensity image; performing a filtering process on the intensity image to generate an intensity coarse image and an edge image; generating a color coarse image according to the intensity coarse image and the color information; performing a pure color analysis on the color coarse image to generate a first pure color coarse image, a second pure color coarse image and a third pure color coarse image; and displaying the first pure color coarse image, the second pure color coarse image, the third pure color coarse image and the edge image in a first time period, a second time period, a third time period and a fourth time period respectively.