Colour Sequential Display Eliminating Breakup via Temporal Control
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Solution Overview
Problem
Colour sequential display devices experience colour breakup when eye movement is rapid compared to the frame rate, particularly in applications like head-up displays, due to the separation of primary colours on the retina.
Innovation Solution
A colour sequential display device using a two-coloured illumination source, such as green and red, with a novel driving scheme that provides three discrete display colours (green, red, and yellow) by temporally controlling the illumination, eliminating the need for colour sub-pixels and avoiding colour breakup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If colour sequential display devices present different primary colours in rapid succession at a given pixel, then the perception of a single display colour is achieved, but colour breakup occurs when eye movement is rapid compared to the frame rate
Solution Approach 1:
The display is divided into multiple sub-frames within a single frame period. Each sub-frame presents a different primary colour (red, green, blue) sequentially, allowing the eye to integrate these separate colour presentations into a single perceived colour while maintaining colour integrity even during rapid eye movements.
Solution Approach 2:
The patent applies preliminary colour shifting to compensate for expected eye movement. By adjusting the timing and positioning of colour presentations in advance based on predicted eye motion, the system prevents colour breakup before it occurs, maintaining colour integrity during rapid eye movements.
2Manufacturing precision
If multiple illumination sources are used to provide different colours, then colour accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
Multiple illumination sources are merged into a single illumination source that can dynamically switch between different colours. This single illumination source is controlled by a colour control circuit that selectively activates different colour components (red, green, blue) based on the required display colour, reducing device complexity while maintaining colour accuracy.
Solution Approach 2:
The single illumination source is designed with multi-functionality to serve as the source for multiple colours (red, green, blue). By incorporating multiple colour capabilities within one illumination source and controlling it through a colour control circuit, the system achieves the versatility of multiple illumination sources without the complexity and power consumption of having separate sources for each colour.
3Adaptability or versatility
If blue light is used in the illumination source, then colour range is improved, but health concerns and power consumption increase
Solution Approach 1:
The illumination source dynamically adjusts its colour output based on the display requirements. The colour control circuit selectively activates different colour components (red, green, blue) only when needed, allowing the system to achieve a wide colour range while minimizing exposure to potentially harmful blue light by using it only when necessary for specific colour reproductions.
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 allows for the display of three colours without colour breakup, achieving high light and power efficiency, and reducing the need for multiple illumination sources, while avoiding the drawbacks of using blue light.
Implementation Method 1
Colour sequential display devices exploit the eye's response time by presenting different primary colours in rapid succession at a given pixel to give the perception of a single display colour
Implementation Method 2
Coloured light from the illumination source enters the display panel and is modulated according to the transmission characteristics of the pixels
Data Source
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AI summary
A colour sequential display method and apparatus that reduces or eliminates colour breakup. In a given frame (21 ) an illumination source (4) provides a first illumination colour, e.g. green, in a first subframe (31 ), a second illumination colour e.g. red, in a third subframe (33), and both the first and second illumination colours simultaneously in a second subframe (32) to provide a third mixed illumination colour. Also in the given frame (21 ) the pixel is driven either: (a) during the first subframe (31 ) to display the first colour; or (b) during the third subframe (33) to display the second colour; or (c) at least during the second subframe (32) to display the third colour. Colour breakup of the mixed colour is thereby reduced, or if choice (c) is carried out only during the second subframe (32), will tend to be eliminated.