Transparent Electrode Potential Control for Display Burn-In
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Solution Overview
Problem
Display devices often suffer from the image burn-in phenomenon after prolonged use, leading to a decrease in user experience due to ghost images or stuck images, which current technologies have not effectively addressed.
Innovation Solution
The display device incorporates a design with a first and second substrate, a display medium, first and second pixel electrodes, and a transparent electrode, where the transparent electrode receives specific common potentials to adjust the potential difference between sub-pixels, optimizing grey levels and flicker values to reduce brightness differences and alleviate image burn-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional display devices are used for long time, then display function is maintained, but image burn-in phenomenon occurs causing ghost images
Solution Approach 1:
The patent applies periodic action by alternately applying first and second common potentials to the transparent electrode in different time periods. During a first time period, the first common potential is applied to the first sub-pixel, and during a second time period, the second common potential is applied to the second sub-pixel. This periodic switching prevents image burn-in by ensuring that no single sub-pixel is continuously subjected to the same potential, thereby eliminating the condition that causes ghost images while maintaining overall display quality.
2Object-affected harmful factors
If different common potentials are applied to different sub-pixels, then image burn-in is reduced, but brightness difference between regions increases
Solution Approach 1:
The patent applies parameter changes by carefully controlling the potential difference between the first and second common potentials within a specific range (0 mV to 100 mV). This parameter optimization ensures that when grey levels are in the range of about 96 to 180, the brightness difference between regions remains minimal while still achieving the effect of reducing image burn-in. The potential difference parameter is precisely tuned to balance both objectives.
Solution Approach 2:
The patent applies local quality by assigning different common potentials to different sub-pixels based on their specific positions and requirements. The first sub-pixel receives the first common potential while the second sub-pixel receives the second common potential, allowing each sub-pixel to be optimized for its local conditions. This localized potential assignment reduces image burn-in in specific regions without causing excessive brightness differences across the entire display.
3Object-affected harmful factors
If potential difference between common potentials is increased, then image burn-in mitigation improves, but flicker increases
Solution Approach 1:
The patent applies parameter changes by optimizing the potential difference between the first and second common potentials to fall within the specific range of 0 mV to 100 mV. This parameter optimization achieves a balance where the potential difference is sufficient to mitigate image burn-in by creating varying electric field conditions in different sub-pixels, yet small enough to avoid causing noticeable flicker effects. The grey level range of about 96 to 180 is also optimized to work with this potential difference.
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 design effectively reduces brightness differences between regions, thereby significantly improving user experience by mitigating the image burn-in phenomenon and maintaining display quality.
Implementation Method 1
a display medium 106, a first pixel electrode 116, a second pixel electrode 118, and a transparent electrode 120. The display medium 106 is disposed between the first substrate 102 and the second substrate 104
Implementation Method 2
The transparent electrode 120 receives a first common potential Vcom1 and a second common potential Vcom2. When grey levels displayed by the first sub-pixel 112 and the second sub-pixel 114 are in the range of about 96 to 180, a potential difference between the first common potential Vcom1 and the second common potential Vcom2 is in the range of about 0 mV to 100 mV
Data Source
AI summary
A display device includes a first substrate, a second substrate, a display medium, a first pixel electrode, a second pixel electrode and a transparent electrode. Sub-pixel units are defined on the first substrate and the second substrate. A sub-pixel unit has a first sub-pixel and a second sub-pixel. The transparent electrode is disposed on the second substrate, and the transparent electrode receives a first common potential and a second common potential. When grey levels displayed by the first sub-pixel and the second sub-pixel are in the range of about 96 to 180, a potential difference between the first common potential received when the first sub-pixel has the maximum brightness and the second common potential received when the second sub-pixel has the minimum brightness is in the range of about 0 mV to 100 mV.