LCD Flicker Compensation via Transition Frame Insertion
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Solution Overview
Problem
Liquid crystal display (LCD) devices experience undesirable flicker due to differing pixel rise and fall rates, leading to luminance flashes, which existing solutions like Gadeyne's method address by slowing all pixel transition times, causing smearing and contrast loss, and requiring complex implementations specific to each device.
Innovation Solution
An algorithm that inserts transition frames between display data frames to minimize average luminance variation, creating a sequence of dark and light luminance flashes that cancel each other out, effectively reducing flicker perception, and allows operator adjustment for various factors like image content, temperature, and human eye sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pixel response time is minimized by making rise and fall rates unequal, then pixel transition speed is improved, but flicker occurs due to luminance jumps
Solution Approach 1:
The patent applies preliminary action by inserting a transition frame before the actual image frame to pre-adjust pixel states. This transition frame contains intermediate luminance values that prepare pixels for the upcoming frame, ensuring smooth transitions and preventing luminance jumps that cause flicker while maintaining fast response times.
Solution Approach 2:
The transition frame acts as an intermediary between consecutive image frames. It mediates the luminance transition by providing intermediate states that bridge the gap between different frame luminance levels, thereby eliminating abrupt luminance changes and the resulting flicker effect.
2Object-affected harmful factors
If transition frames are inserted to reduce flicker, then flicker perception is reduced, but display time is increased
Solution Approach 1:
The patent applies partial action by inserting transition frames only in specific situations where luminance changes are detected, rather than for every frame. This selective approach reduces flicker when needed while minimizing the impact on display time by avoiding unnecessary transition frames when luminance is stable.
3Stability of the object's composition
If all pixel transition times are slowed to match the slowest pixel, then rise and fall rates are matched, but smearing and contrast loss occur
Solution Approach 1:
The patent applies local quality by applying different transition adjustments to different pixels based on their individual characteristics and the specific luminance changes they need to undergo. Rather than uniformly slowing all pixels, the transition frame contains pixel-specific intermediate values that are tailored to each pixel's requirements, maintaining image quality while achieving rate matching.
4Object-affected harmful factors
If complex implementations are used to match luminance rise and fall times, then flicker is compensated, but device complexity increases
Solution Approach 1:
The patent applies copying by creating a transition frame that is a modified copy of the previous or next frame. This transition frame is generated by copying pixel data and applying luminance interpolation, which is a simpler operation than complex real-time adjustment circuits. This approach achieves flicker compensation through software-based image processing rather than complex hardware implementations.
Data Source
AI summary
Systems and methods are provided for use in correcting flicker of a display (e.g., an LCD display). For example, correction may employ the insertion of at least one transition data frame between display data frames for use in displaying a transition image by pixel elements of the display such that a user perceives display of a constant average luminance by the pixel elements.