Field Sequential Display Flicker Reduction via Sub-frame Segmentation
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Solution Overview
Problem
Conventional field sequential LCDs experience flicker due to low driving frequencies of single color light sources, which are the same as the frame rate, leading to noticeable flicker and increased fabrication costs when attempting to increase these frequencies.
Innovation Solution
A field sequential image display apparatus that increases the average driving frequency of single color light sources by dividing frames into more fields than the number of light sources, allowing for independent or synchronized driving of these sources to exceed the frame rate, thereby reducing flicker without altering the frame rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the driving frequency of single color light sources is increased to reduce flicker, then flicker perception is reduced, but fabrication costs increase and device complexity increases
Solution Approach 1:
The patent segments the frame into multiple sub-frames (first sub-frame, second sub-frame, third sub-frame) and assigns different light sources to different sub-frames. This segmentation allows each light source to operate at a higher frequency within its allocated time slot, reducing flicker perception without requiring all light sources to operate at high frequencies simultaneously, thus controlling fabrication costs.
Solution Approach 2:
The patent dynamically assigns light sources to sub-frames based on the image signal requirements. The control unit dynamically determines which light source drives which sub-frame, allowing flexible adjustment of driving frequencies. This dynamic allocation enables flicker reduction through optimized timing without fixed high-cost hardware configurations.
2Object-affected harmful factors
If the driving frequency of single color light sources is increased to reduce flicker, then flicker perception is reduced, but device complexity increases
Solution Approach 1:
By segmenting the frame into sub-frames and assigning specific light sources to specific sub-frames, the control complexity is managed through a systematic allocation scheme. The control unit follows a predetermined pattern of assignment rather than independently controlling each light source at high frequency, simplifying the control architecture while achieving flicker reduction.
Solution Approach 2:
The patent makes the light sources multi-functional by enabling each light source to drive multiple sub-frames across different frames. For example, a first light source can drive the first sub-frame of frame 1, the second sub-frame of frame 2, and the third sub-frame of frame 3. This universal usage pattern reduces the need for separate dedicated high-frequency drivers for each light source, thereby reducing overall device complexity.
3Productivity
If frames are divided into more fields than the number of light sources, then average driving frequency of light sources increases, but signal processing complexity increases
Solution Approach 1:
The patent segments the frame into a specific number of sub-frames (three sub-frames) that matches the number of light sources available. This segmentation strategy allows each light source to be assigned to specific sub-frames, increasing the average driving frequency to 90 Hz while maintaining manageable signal processing complexity through a one-to-one mapping between light sources and sub-frame groups.
Solution Approach 2:
The patent changes the temporal parameter by introducing sub-frames with different time allocations. The first sub-frame has time T1, the second sub-frame has time T2, and the third sub-frame has time T3, where T1+T2+T3 equals the total frame time. This parameter change allows optimized driving frequencies for each light source while maintaining the overall frame rate, balancing productivity improvement with processing complexity.
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 increased average driving frequency of single color light sources reduces flicker perception and maintains the frame rate, simplifying signal processing and reducing fabrication costs.
Implementation Method 1
displaying color images using an after image effect
Data Source
AI summary
Provided are a field sequential image display apparatus that reduces flicker and a method of driving the same. The field sequential image display apparatus, which uses a plurality of single color light sources, includes: an image analyzing unit dividing frames of an image signal into fields, whereby the number of fields is greater than the number of single color light sources; an image display panel displaying the fields sequentially; and a light source unit comprising the plurality of single color light sources that are independently driven or driven with other light sources in order to supply lights corresponding to the color components of the fields to the image display panel, wherein an average driving frequency of the single color light sources is higher than a frame rate.