Bent Sub-Non-Display Regions for Uniform OLED Power
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Solution Overview
Problem
In organic light emitting display (OLED) devices, achieving uniform picture quality is challenging due to variations in pixel power voltages, which affect the emission brightness of pixels, leading to inconsistent image display.
Innovation Solution
A display device design featuring a substrate with a display region and non-display regions that are bent to minimize exposure and include wiring lines and circuit boards connected to sub-non-display regions, ensuring uniform pixel power supply through strategically positioned connection terminals and conductive members, allowing for efficient power distribution to pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the non-display region is extended from the sides of the display region to accommodate wiring lines and connection terminals, then the wiring lines can be efficiently connected to pixels, but the non-display region occupies more area and may cause overlapping when bent
Solution Approach 1:
The non-display region is divided into multiple sub-non-display regions (first, second, third, fourth sub-non-display regions) that are respectively extended from different sides of the display region. This segmentation allows wiring lines to be distributed across multiple regions, reducing the area required in any single region and preventing overlapping when the regions are bent.
Solution Approach 2:
The non-display regions are extended in different spatial directions from the display region - some from the left side, some from the right side, some from the top side, and some from the bottom side. This multi-dimensional arrangement optimizes space utilization and prevents overlapping when the display device is folded or bent.
2Volume of moving object
If the non-display region is bent to minimize exposure, then the overall device size is reduced, but the wiring lines and connection terminals may become misaligned or damaged
Solution Approach 1:
By dividing the non-display region into multiple sub-regions distributed around the display region, the bending stress is distributed across multiple separate regions rather than concentrated in one area. This reduces the risk of damage to wiring lines and connection terminals during bending operations.
Solution Approach 2:
The wiring lines are pre-routed through the non-display regions and connection terminals are pre-positioned in extension regions before bending occurs. This preliminary arrangement ensures that when bending happens, the connections are already in place and less susceptible to misalignment or damage.
3Device complexity
If pixel powers are supplied through extended non-display regions, then power distribution is simplified, but voltage drops may occur leading to non-uniform brightness
Solution Approach 1:
Different sub-non-display regions are positioned at different locations around the display region to supply pixel powers locally. This distributed power supply approach reduces the length of power transmission paths and minimizes voltage drops, ensuring more uniform brightness across the display.
Solution Approach 2:
The non-display regions are configured to maintain equipotential conditions for power supply by providing multiple access points around the display region. This ensures that voltage levels remain consistent across different areas, preventing brightness non-uniformity caused by voltage drops.
Data Source
AI summary
A display device includes a substrate including a display region and a non-display region including sub-non-display regions extending from sides of the display region and separated from each other, a display layer provided on a surface of the substrate in the display region and including pixels, and wiring lines provided in the sub-non-display regions on the substrate and electrically connected to the pixels. The sub-non-display regions each includes a display connection region connected to the display region and at least one extension region extending from a part of the display connection region. The sub-non-display regions are bent and are disposed on a surface opposite to a surface, on which the display layer is disposed, in the display region. When the sub-non-display regions are bent, an extension region of one of the sub-non-display regions overlaps another extension region of another of the sub-non-display regions.