Touch Panel Electrode Segmentation for Display Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with integrated touch panel functionality face challenges in maintaining display quality due to the presence of electrodes, which can reduce luminance and affect the viewing experience, especially when viewed from oblique angles.
Innovation Solution
The configuration includes a display device with a touch panel electrode designed above a partition that extends along the partition, optimizing the placement and width of the first metal line to minimize interference with light emission while enabling touch detection, and using a resin layer and sealing layers to prevent moisture ingress and maintain display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel electrode is provided in the display area, then touch detection function is enabled, but display quality deteriorates due to luminance reduction and oblique viewing angle issues
Solution Approach 1:
The touch panel electrode is divided into multiple segments: a first electrode extending in the row direction and a second electrode extending in the column direction, intersecting to form detection regions. This segmentation allows the electrode structure to be optimized for touch detection while minimizing impact on display quality by distributing the electrode material across multiple smaller regions rather than using large continuous electrodes.
Solution Approach 2:
The electrode width is specifically optimized in different regions: the first electrode has a width designed to minimize luminance reduction, while the second electrode's width is adjusted to reduce oblique viewing angle degradation. This local optimization of electrode dimensions in different spatial orientations addresses the specific display quality issues caused by each electrode direction.
2Measurement precision
If the electrode width is increased to improve touch detection sensitivity, then touch detection precision improves, but display quality deteriorates due to increased light blocking
Solution Approach 1:
The electrode width parameter is precisely controlled within specific ranges (first electrode width: 1-5 μm, second electrode width: 1-5 μm) to optimize the balance between touch detection sensitivity and display quality. By adjusting these dimensional parameters to appropriate values, the electrode provides sufficient touch detection capability while minimizing light blocking and luminance reduction.
3Device complexity
If the electrode structure is simplified to reduce manufacturing complexity, then device complexity decreases, but display quality deteriorates due to insufficient optimization of electrode placement
Solution Approach 1:
The first and second electrodes are designed with asymmetric orientations: the first electrode extends primarily in the row direction while the second electrode extends in the column direction, creating an orthogonal asymmetric pattern. This asymmetric arrangement optimizes touch detection in multiple directions while allowing each electrode to have different width characteristics tailored to minimize specific display quality issues associated with each orientation.
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 enhances display quality by reducing luminance loss even when viewed from oblique angles and ensures the display device's resistance to moisture, effectively integrating touch panel functionality without compromising image quality.
Implementation Method 1
an organic layer which is provided between the lower electrode and the upper electrode and emits light based on a potential difference between the lower electrode and the upper electrode
Data Source
AI summary
According to one embodiment, a display device includes a plurality of display elements each including a lower electrode, an upper electrode, and an organic layer between the lower electrode and the upper electrode, a partition which includes a conductive lower portion and an upper portion protruding from a side surface of the lower portion and surrounds each of the display elements, and a touch panel electrode which detects an object contacting or approaching a display area including the display elements. The touch panel electrode includes a first metal line located above the partition and extending along the partition.