Organic Light Emitting Display Bezel Reduction via Gate Driver Overlap
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in minimizing the non-display area to maximize the display area, which affects the aesthetics, portability, and image quality, especially at different viewing angles.
Innovation Solution
The design incorporates a structure with a first display area of high pixel density and a second display area of lower pixel density, where the gate driver overlaps the second display area, allowing for a reduced bezel size and improved image quality by using oxide TFTs and LTPS TFTs in pixel circuits, and optimizing the placement of the gate driver and scan drivers to minimize the non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the gate driver is placed in the non-display area, then the display area can be maximized, but the device complexity increases due to overlapping structures
Solution Approach 1:
The gate driver is positioned in the non-display area rather than overlapping the display area, utilizing the vertical dimension of the device structure to accommodate the driver circuitry. This dimensional reorganization allows the display area to be maximized while the gate driver occupies the available space in the non-display region, resolving the contradiction between maximizing display area and reducing structural complexity.
2Manufacturing precision
If the pixel density is increased in the second display area, then the image quality improves, but the manufacturing precision requirements increase
Solution Approach 1:
The display area is divided into a first display area with higher pixel density and a second display area with lower pixel density. This local differentiation allows each region to be optimized for its specific function: the first display area provides high-quality image display, while the second display area provides sufficient quality for less critical regions. This resolves the contradiction by allowing varied pixel densities across different locations rather than requiring uniform high density throughout.
Solution Approach 2:
The pixel density parameter is changed across different display areas, with the first display area having a higher pixel density than the second display area. This parameter variation allows the device to achieve good overall image quality while reducing manufacturing precision requirements in the second display area, thereby resolving the contradiction between image quality consistency and manufacturing precision requirements.
3Area of stationary object
If the bezel size is reduced, then the aesthetics and portability improve, but the area for placing the gate driver decreases
Solution Approach 1:
The gate driver is positioned in the non-display area at the edge of the display device, utilizing the vertical edge space rather than requiring additional horizontal bezel area. This dimensional placement allows the bezel to be minimized for aesthetic and portability benefits while still providing sufficient space for the gate driver in the non-display region.
4Illumination intensity
If the luminance is increased in the second sub-pixel, then the perceived image quality improves, but the energy consumption increases
Solution Approach 1:
The second sub-pixel is configured to emit light with higher luminance specifically in the second display area where lower pixel density is used. This localized luminance enhancement compensates for the lower pixel density in that region, improving perceived image quality. The higher luminance is applied only where needed rather than uniformly across the entire display, which helps manage overall energy consumption while maintaining image quality consistency.
Data Source
AI summary
An organic light emitting display device includes a first display area in which first sub-pixels are disposed, a second display area in which second sub-pixels are disposed in a density lower than the first display area, and a gate driver at least a part of which overlaps the second display area.