LCD Driver System Bright Dark State Signal Alternation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display (LCD) devices experience color shift and brightness variations when viewed from different angles due to differing light transmittance at various viewing angles, leading to inconsistent color representation.
Innovation Solution
A driver system for LCDs uses a combination of bright state and dark state display signals, alternating voltage polarities across pixel substrates to maintain consistent brightness and reduce color shift, ensuring identical driving sequences for adjacent pixels of the same color to minimize flickering and resolution degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional single-state display signals are used, then device complexity is low, but color shift and brightness variation occur at different viewing angles
Solution Approach 1:
The display driving signal is segmented into two distinct states: a bright state signal that produces high light transmittance and a dark state signal that produces low light transmittance. By segmenting the signal into these two states and alternating them in a sequence, the patent achieves better color consistency across viewing angles while maintaining manageable driving complexity through the structured alternation pattern.
2Illumination intensity
If bright state signals are used to maintain high brightness, then illumination intensity is high, but color shift increases at oblique viewing angles
Solution Approach 1:
The patent employs periodic action by alternating between bright state signals and dark state signals in a repeated sequence. This periodic switching allows the display to maintain high average brightness through the bright states while the dark states compensate for color shift effects, achieving both high illumination intensity and reduced color shift through the rhythmic alternation of the two states.
3Ease of manufacture
If different driving sequences are applied to adjacent pixels, then manufacturing is simpler, but flickering and resolution degradation occur
Solution Approach 1:
The patent applies local quality by tailoring the driving sequence to the specific characteristics of each pixel or pixel group. Different regions of the display may have slightly different driving sequences optimized for their local properties, which reduces flickering and maintains resolution stability. This localized optimization is achieved while keeping the overall manufacturing process simple through systematic sequence generation based on pixel position and type.
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 effectively reduces color shift and flickering, maintaining consistent brightness and resolution across different viewing angles by combining bright and dark state signals and ensuring synchronized driving sequences for adjacent pixels, thereby enhancing the display quality.
Implementation Method 1
the incident light from different angles results in different retardation in the liquid crystal layer. Hence, the refractive index influence in the transmitted light will change according to different viewing angles
Implementation Method 2
the incident light from different angles results in different retardation in the liquid crystal layer
Data Source
AI summary
A display has plural pixel groups each having plural color pixels. In a given frame that is divided into a first sub-period and a second sub-period, a first signal is provided in the first sub-period to a pixel of a given color in a first pixel group, and a second signal is provided to the pixel in the second sub-period. The first signal is set to one of a first polarity and a second polarity, and the second signal is set to one of the first polarity and second polarity, wherein the first signal and the second signal form a first sequence. A pixel of the given color in a second pixel group that is adjacent the first pixel group is driven with a second sequence of signals that is the same as the first sequence.