OLED Display Power Supply Lines on Counter Substrate
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Solution Overview
Problem
Conventional OLED display devices with large screens and high precision suffer from luminance gradients due to high resistance in power supply lines, which restricts the area where these lines can be located, leading to image quality deterioration.
Innovation Solution
The OLED display device features power supply lines on the counter substrate, connected via conductive members to the array substrate, allowing for low-resistance power supply without area restrictions, thus improving image quality and enabling larger screens with narrow frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the screen size is enlarged and the frame area is narrowed, then the display precision is improved, but the area available for power supply lines is reduced, causing increased resistance
Solution Approach 1:
The patent transitions from placing power supply lines only on the array substrate to distributing them across both the array substrate and the counter substrate. This dimensional expansion allows the power supply network to utilize additional space without increasing the frame area, thereby maintaining low resistance while achieving high display precision and large screen size
2Reliability
If thinner or narrower power supply lines are used, then the resistance is reduced, but the area available for other components is reduced
Solution Approach 1:
The patent segments the power supply line function across two substrates (array substrate and counter substrate), allowing each substrate to host a portion of the power supply network. This segmentation enables the use of thinner lines with lower resistance while distributing the area requirement across both substrates, thus preserving area for other components
3Reliability
If multiple power supply lines or multi-layer power supply lines are used, then the resistance is reduced, but the device complexity is increased
Solution Approach 1:
Instead of increasing complexity through multiple layers or lines on a single substrate, the patent uses the third dimension by placing power supply lines on both the array substrate and the counter substrate. This spatial distribution achieves low resistance with simpler individual line structures, avoiding the complexity of multi-layer or multiple-line configurations
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 ensures uniform power supply to all pixels, eliminating luminance gradients and enhancing image quality by reducing power supply line resistance, allowing for larger screens and higher precision without frame area limitations.
Implementation Method 1
a conductive member located in an area not overlapping the display area of the first substrate, the conductive member being located as connecting the first substrate and the second substrate to each other
Data Source
AI summary
An OLED display device includes a first substrate including a plurality of pixels located in a matrix and a second substrate facing the first substrate. The plurality of pixels each include a pixel circuit to which a data voltage is written and an OLED display element including a first electrode supplied with a current from the pixel circuit in accordance with the data voltage, and a second electrode supplied with a power supply voltage. The first substrate and the second substrate each include a plurality of power supply lines; the plurality of power supply lines of the first substrate and the plurality of power supply lines of the second substrate are respectively connected to each other via a conductive member; and each of the plurality of power supply lines is connected to the second electrode of the OLED display element.