Dummy Electrode Layout for Edge Color Shift in Displays
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Solution Overview
Problem
Conventional display devices experience color shift due to residual ions accumulating on the sides of the display area, which is not effectively mitigated by increasing the black matrix area at the border.
Innovation Solution
A display device with a peripheral area containing dummy electrodes, where the polarity of the dummy electrodes is opposite to that of the adjacent pixel unit columns, effectively counteracting the electric fields that cause ion accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the area of the black matrix at the border is increased to shade pixels that may lead to color shift, then the color shift phenomenon is reduced, but the aperture ratio decreases
Solution Approach 1:
The patent introduces dummy electrodes as intermediary elements positioned between the pixel electrodes and the black matrix. These dummy electrodes generate compensating electric fields that counteract the harmful electric fields from residual ions, thereby preventing color shift without requiring increased black matrix area that would reduce aperture ratio
Solution Approach 2:
The patent changes the electrical parameters by applying opposite polarity signals to dummy electrodes compared to pixel electrodes. This parameter change creates compensating electric fields that neutralize the harmful effects of ion accumulation, solving the color shift issue while maintaining the aperture ratio
2Area of stationary object
If conventional designs are used without dummy electrodes, then the aperture ratio is maintained, but ion accumulation occurs at the edges causing color shift
Solution Approach 1:
The patent applies preliminary anti-action by pre-positioning dummy electrodes with opposite polarity to the pixel electrodes. These dummy electrodes generate electric fields that counteract ion accumulation before it can cause harmful color shift effects, thereby maintaining both aperture ratio and display quality
Solution Approach 2:
The patent converts the harmful effect of ion accumulation into a beneficial outcome by using dummy electrodes to create compensating electric fields. The same region where ions accumulate (at the edges) becomes the location where dummy electrodes generate protective fields, transforming the harmful ion accumulation zone into a beneficial color shift prevention zone
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 use of dummy electrodes with opposite polarities in the peripheral area of the display device effectively prevents ion accumulation, thereby avoiding color shift and enhancing display quality.
Implementation Method 1
In applying an electric field to drive the liquid crystal, ions may remain on the left and right sides of the display area due to the unidirectional electric field and thus form unnecessary electric fields
Implementation Method 2
ions may remain on the left and right sides of the display area due to the unidirectional electric field and thus form unnecessary electric fields, resulting in a color shift phenomenon
Data Source
AI summary
A display device has a display area and a peripheral area, and includes an array substrate. The array substrate includes M number of pixel unit columns disposed in the display area and a first dummy electrode disposed in the peripheral area, where M is a positive integer greater than or equal to 2. The M number of pixel unit columns include a first pixel unit column to an Mth pixel unit column arranged in sequence. Each of the M number of pixel unit columns includes a plurality of pixel units arranged in sequence. The first dummy electrode is located on one side of the first pixel unit column. During a frame period, the first pixel unit column receives the first pixel signal, and the first dummy electrode receives the first dummy signal. The polarity of the first pixel signal is different from that of the first dummy signal.