Field-Sequential Display Pixel Shielding for Uniform Luminance
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Solution Overview
Problem
Existing display devices face challenges in achieving high response speed and uniform brightness due to variations in liquid crystal molecule rotation speeds near signal lines, leading to flickering and non-uniform luminance.
Innovation Solution
The display device incorporates a design where a part of the signal line acts as a light-shielding layer to cover branch portions of the slit, ensuring uniform rotation of liquid crystal molecules and high luminance, while using a field sequential method for driving pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If signal lines are extended to cover branch portions of the slit, then uniformity of liquid crystal rotation is improved, but light transmission is reduced due to additional light shielding
Solution Approach 1:
The signal line is selectively extended only in regions where branch portions of the slit exist, creating local light shielding precisely where needed to uniformize liquid crystal rotation. This localized approach improves uniformity without unnecessarily reducing overall light transmission across the entire pixel area.
Solution Approach 2:
The signal line, which inherently causes non-uniform liquid crystal rotation due to its electromagnetic field interference, is strategically extended to become a light-shielding structure. This converts the harmful effect of signal line interference into a beneficial light shielding function that uniformizes the display by blocking light in specific regions where branch portions create rotation anomalies.
2Manufacturing precision
If the common electrode slit has branch portions, then liquid crystal alignment control is improved, but response speed decreases due to variations in molecule rotation speeds
Solution Approach 1:
The light-shielding signal line is extended specifically in regions where branch portions of the slit create non-uniform liquid crystal rotation. This localized light shielding compensates for the alignment control complexity introduced by branch portions, enabling uniform response across the pixel while maintaining the alignment benefits of the slit structure.
Solution Approach 2:
The extended signal line acts as an intermediary light-shielding structure between the branch portions of the slit and the liquid crystal molecules. It mediates the interaction by blocking light in specific regions, thereby uniformizing the effective electric field distribution and enabling consistent liquid crystal rotation speeds across different areas of the pixel.
3Area of stationary object
If signal lines are positioned close to slit branch portions, then pixel integration is improved, but brightness uniformity deteriorates due to differential light shielding effects
Solution Approach 1:
The signal line is extended asymmetrically, with different extension lengths on different sides of the slit branch portions. This asymmetric light shielding compensates for the differential effects caused by the signal line's proximity to branch portions, uniformizing brightness across the pixel while maintaining high pixel integration efficiency.
Solution Approach 2:
The light-shielding structure (signal line) is deliberately designed with asymmetric extension relative to the slit branch portions. This asymmetric configuration creates differential light shielding that compensates for the asymmetric positioning of signal lines near branch portions, thereby achieving brightness uniformity while maximizing pixel area utilization.
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
This design achieves high and uniform luminance with fast response speed by controlling liquid crystal molecule rotation uniformly, reducing flickering and brightness differences within pixels.
Implementation Method 1
a part of the signal lines extends along a first direction, and a part of the signal lines serves as a light-shielding layer
Implementation Method 2
the alignment of liquid crystal molecules in the liquid crystal layer is controlled using a transverse electric field generated between these electrodes
Implementation Method 3
in the IPS mode, liquid crystal display devices of a fringe field switching (FFS) mode, in which the pixel electrode and the common electrode are arranged in different layers, have been put into practical use. In such a liquid crystal display device, the alignment of the liquid crystal molecules is controlled using a fringe field generated between the pair of electrodes
Data Source
AI summary
According to one embodiment, a display device includes a plurality of scanning lines, a plurality of signal lines, a plurality of pixels, and a common electrode, wherein the plurality of pixels have a shape of a square, which has a same length along the first direction and the second direction, a trunk portion extends along the first direction, each of a plurality of branch portions extends from the trunk portion along the second direction, a part of the signal lines extends along the first direction, of the plurality of branch portions, those located close to the signal lines are shielded by a light shielding region, which is the part of the signal lines, and the plurality of pixels are driven by a field sequential method.