Touch Display Device With Zigzag Electrodes And Variable Pixel Sizes
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Solution Overview
Problem
OLED touch display devices experience display defects due to variances in the overlap of touch electrodes and pixels, leading to luminance variations and defects when viewing angles change.
Innovation Solution
The solution involves forming pixels of different sizes and arranging touch electrodes in a zigzag shape, with varying distances between them, to adjust the overlapping extent ratio and maintain consistent luminance across different viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform-sized pixels and regular touch electrode arrangement are used, then manufacturing is simple, but luminance uniformity deteriorates due to overlap variances
Solution Approach 1:
The patent applies local quality by making pixels of different sizes (first pixels and second pixels with different dimensions) and arranging touch electrodes at different distances from different pixels. This creates locally optimized overlap ratios for each pixel-electrode pair, ensuring uniform luminance compensation across the entire display while maintaining manufacturing feasibility through systematic variation rather than complete irregularity.
Solution Approach 2:
The patent employs asymmetry by using non-uniform pixel sizes and irregular touch electrode patterns. Specifically, first pixels and second pixels have different sizes, and touch electrodes are positioned at different distances from different pixels, creating an asymmetric arrangement that compensates for luminance variations caused by viewing angle changes while resolving the contradiction between manufacturing simplicity and luminance uniformity.
2Ease of operation
If touch electrodes are placed close to pixels, then touch sensitivity improves, but luminance variation increases due to excessive overlap
Solution Approach 1:
The patent applies local quality by setting different distances between touch electrodes and different pixels (first pixels vs. second pixels). This allows each pixel-electrode pair to have an optimized overlap ratio that balances touch sensitivity requirements with luminance consistency, preventing excessive overlap-induced luminance variation while maintaining adequate sensitivity.
3Area of stationary object
If larger pixels are used, then aperture ratio improves, but overlap variance with fixed electrodes increases causing more luminance defects
Solution Approach 1:
The patent applies local quality by using pixels of different sizes (first pixels and second pixels) and corresponding different touch electrode distances. This systematic variation in pixel sizes allows each pixel type to have an optimized overlap ratio with its associated touch electrodes, maintaining high aperture ratios while preventing luminance uniformity degradation that would result from fixed electrode positions.
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 configuration improves the aperture ratio, reduces manufacturing costs, and enhances the reliability of the touch display device by minimizing display defects and maintaining consistent luminance across different viewing angles.
Implementation Method 1
light is generated as excitons, which are formed by the combination of holes injected from the hole injection electrode and electrons injected form the electron injection electrode, shift from excited state to ground state
Implementation Method 2
the capacitive touch screen panel converts information of a contact position into an electrical signal, by sensing a change in the capacitance formed between a conductive sensing pattern and an adjacent sensing pattern, ground electrode or the like
Data Source
AI summary
A touch display device including a display panel including a plurality of first pixels and a plurality of second pixels alternately disposed along a first direction, and a touch screen layer disposed on the display panel, the touch screen layer including a plurality of first touch electrodes having a zigzag shape and disposed between one of the first and second pixels along a second direction crossing the first direction, in which a first pixel of the first pixels and a second pixel of the second pixels have different sizes from each other, and a first distance from a first touch electrode of the first touch electrodes to the first pixel is different from a second distance from the first touch electrode to the second pixel.