OLED Display Device Static Image Burn Prevention Logic
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Solution Overview
Problem
Current OLED display devices suffer from 'screen burn' due to rapid degradation of blue sub-pixel luminescence efficiency in areas displaying static images for extended periods, leading to permanent local afterimages.
Innovation Solution
A display device with a logic control unit that alternately transmits replacement display data to the light-emitting driving unit at a preset maintenance frequency, changing the content in local areas displaying static images for long durations, and adjusts the driving current for blue sub-pixels to maintain brightness and prevent yellowish color shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If static images are displayed in fixed local areas for extended periods, then display functionality is maintained, but blue sub-pixels degrade rapidly causing screen burn and permanent afterimages
Solution Approach 1:
The patent implements periodic action by alternating between displaying the original static image and replacement color images at a predetermined maintenance frequency. This periodic switching prevents continuous stress on the same blue sub-pixels, thereby reducing degradation and avoiding screen burn while maintaining display functionality.
Solution Approach 2:
The patent applies parameter changes by modifying the display content parameters - specifically replacing the original static image with replacement color images that have different color characteristics. This changes the operational parameters of the sub-pixels, reducing cumulative damage to blue sub-pixels and extending their service life.
2Reliability
If replacement display data is transmitted at high maintenance frequency, then screen burn is reduced, but display performance and user experience may be affected
Solution Approach 1:
The patent applies partial action by implementing maintenance frequency that is sufficient to prevent screen burn but not excessively high to severely impact display performance. The maintenance frequency is optimized to provide adequate protection while minimizing disruption to normal display functionality and user experience.
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 solution reduces the likelihood of 'screen burn' and extends the service life and display performance of OLED devices by minimizing prolonged usage of static images and enhancing blue light reliability.
Implementation Method 1
driven by an external voltage, electrons and holes injected by an electrode recombine and release energy in an organic material, and the energy is transferred to a molecule of an organic luminescence substance, which is excited and performs transition from a ground state to an excited state. When the excited molecule returns from the excited state to the ground state, a radiation transition thereof produces a luminescence phenomenon.
Data Source
AI summary
A display device includes: a display unit, a first logic control unit and a light emitting driving unit. The first logic control unit is configured to receive image display data for instructing the display unit to display a static image in a local area, if it is determined that the local area maintains displaying the static image beyond a first threshold duration, then preset replacement display data and the image display data are alternately transmitted to the light-emitting driving unit, where a transmission frequency of the replacement display data is a preset maintenance frequency, and the replacement display data is used to enable the display unit to display a replacement color image in the local area; and the light-emitting driving unit is configured to respond to the data received from the first logic control unit and control the display unit to display the static image or the replacement color image.