Bendable Display Panel Dummy Pixel Stress Sensing
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Solution Overview
Problem
Bendable display devices suffer from rapid deterioration and uneven image luminance in bent areas due to lack of compensation for stress and non-uniform manufacturing processes, leading to degraded display quality.
Innovation Solution
Incorporating dummy pixels with pixel driving circuits in non-display areas to sense threshold voltage and mobility of transistors and OLEDs, allowing for compensation and maintaining normal luminance in bent regions by generating and applying correction values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dummy pixels with sensing units are added to the non-display area, then the ability to sense and compensate for bending stress improves, but the device complexity increases
Solution Approach 1:
The display panel is divided into display area and non-display area, with dummy pixels placed only in the non-display area. This segmentation allows the sensing function to be separated from the main display function, enabling compensation without affecting the primary display pixels.
Solution Approach 2:
Dummy pixels act as intermediary sensing elements that detect bending stress in the non-display area and provide data for compensating display quality issues. These intermediary elements enable indirect measurement of bending conditions without requiring modification of the main display pixels.
2Manufacturing precision
If compensation for bent area is implemented, then image luminance uniformity improves, but the manufacturing process complexity increases
Solution Approach 1:
Dummy pixels are incorporated into the manufacturing process from the beginning, allowing bending characteristics to be measured and compensated for during the manufacturing stage. This preliminary action enables pre-compensation of bending effects, simplifying the overall manufacturing process by addressing issues before final assembly.
3Adaptability or versatility
If the display panel is made flexible and bendable, then adaptability improves, but the durability of transistors and OLEDs in bent areas deteriorates
Solution Approach 1:
The dummy pixels provide real-time feedback on bending stress conditions through their sensing units. This feedback mechanism allows the system to monitor the state of transistors and OLEDs in bent areas and apply compensatory measures to maintain their performance and extend their operational life.
Solution Approach 2:
By detecting bending stress early through dummy pixels, the system can apply compensatory voltage adjustments before severe deterioration occurs. This beforehand cushioning approach prevents catastrophic failure of transistors and OLEDs in bent areas by addressing stress accumulation proactively.
Data Source
AI summary
Disclosed are a bendable display panel and a bendable display device including the same, in which dummy pixels for sensing whether bending is made or not are provided in a non-display area. The bendable display panel includes a substrate, including a display area displaying an image and a non-display area surrounding the display area, and a plurality of dummy pixels in the non-display area. A plurality of data lines and a plurality of gate lines are provided in the display and the non-display area.