Display Driver IC Contact Hole Stain Compensation
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Solution Overview
Problem
Organic light emitting displays experience a stain phenomenon due to the electrical connection of auxiliary lines with scan lines, leading to uniform luminance reduction at contact holes, which affects display quality.
Innovation Solution
A display device and integrated circuit that include a look-up table storing location information of contact holes, allowing for compensation of input data based on this information to adjust luminance levels of adjacent pixels, thereby preventing the stain phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact holes are used to electrically connect horizontal scan lines to vertical scan lines, then electrical connectivity is achieved, but uniform luminance is degraded due to the stain phenomenon
Solution Approach 1:
The patent applies preliminary action by storing location information of contact holes in advance in a storage area, and using this information to identify and compensate pixels adjacent to contact holes before displaying images. This pre-prepared compensation data enables the system to counteract the luminance reduction effect before it manifests in the final display output.
Solution Approach 2:
The patent implements parameter changes by modifying the driving voltage or data signal parameters for pixels located adjacent to contact holes. The timing controller adjusts these parameters based on compensation data stored in the storage area, thereby changing the electrical characteristics of signals driving affected pixels to compensate for the luminance reduction caused by contact holes.
2Ease of manufacture
If scan drivers and data drivers are positioned at the sides of the display panel, then ease of manufacture is improved, but stain phenomenon occurs at contact hole locations
Solution Approach 1:
The patent introduces an intermediary element - the storage area containing location information of contact holes - that mediates between the fixed driver positioning and the display output. This intermediary enables the system to identify and compensate for the harmful effects of contact holes without requiring any change to the physical positioning of the drivers.
Solution Approach 2:
The patent uses copying by creating a digital map or look-up table of contact hole locations in the storage area, which mirrors the physical layout of contact holes on the display panel. This copied information is then used by the timing controller to identify and compensate affected pixels without physically altering the display structure or driver positioning.
3Illumination intensity
If compensation data is stored for all pixels, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by storing compensation data only for pixels located adjacent to contact holes, rather than for all pixels in the display panel. This localized approach stores information selectively where it is needed - specifically for pixels that will be affected by the contact hole luminance reduction - thereby reducing overall storage requirements while maintaining display quality where it matters most.
Data Source
AI summary
A display device includes a display panel, a scan driver, a data driver, and a storage area. The display panel includes data lines, horizontal scan lines, vertical scan lines, pixels at crossing regions of the data and horizontal scan lines, and contact holes that connect the horizontal scan lines to the vertical scan lines. The scan driver provides scan signals to the display panel through the vertical scan lines. The data driver provides data signals to the display panel through the data lines. The storage area stores location information of the contact holes.