Flexible Display Residual Image Compensation via Frequency Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible displays, particularly those using OLEDs, suffer from residual image and burn-in issues due to hysteresis characteristics of thin film transistors, which are exacerbated by differences in operational time across multiple pixels.
Innovation Solution
An electronic device with a flexible display that includes a housing with adjustable display regions, a display driver IC, and a processor that controls the display to operate at different driving and light emission frequencies in each region, with the second region using lower frequencies for compensation imaging when stowed, reducing the risk of residual image and burn-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the flexible display operates at high driving frequency and high light emission frequency to display UI screen, then the display quality and responsiveness are improved, but residual image and burn-in occur due to hysteresis characteristics of thin film transistors
Solution Approach 1:
The flexible display is divided into two distinct regions: a first region that displays the UI screen at high frequency and a second region that displays compensation images at low frequency. This segmentation allows different parts of the display to operate at different frequencies, enabling high responsiveness where needed while preventing residual image in other areas.
Solution Approach 2:
The system proactively displays compensation images in the second region before residual image defects can occur. By predicting potential burn-in areas and pre-applying compensation at lower frequencies, the system prevents residual image defects rather than correcting them after they appear.
2Illumination intensity
If the flexible display operates at high light emission frequency to improve brightness and visibility, then the display quality is improved, but power consumption increases and OLED lifespan decreases
Solution Approach 1:
Different regions of the flexible display are assigned different light emission frequencies based on their functional requirements. The first region maintains high light emission frequency for UI visibility, while the second region operates at low light emission frequency for compensation imaging, optimizing both display quality and power efficiency locally.
Solution Approach 2:
The system applies light emission selectively and partially - full brightness and frequency only where absolutely necessary (first region), while using reduced frequency and intensity for compensation purposes (second region). This partial action approach maintains essential display quality while significantly reducing overall power consumption.
3Stability of the object's composition
If the flexible display operates continuously at high frequency to maintain image quality, then the display performance is maintained, but burn-in occurs due to accumulated light-emitting time differences across pixels
Solution Approach 1:
The display employs periodic action by alternating between high-frequency UI display in the first region and low-frequency compensation image display in the second region. This periodic switching prevents continuous high-frequency operation that causes burn-in, while maintaining overall display quality through coordinated regional operations.
Solution Approach 2:
The system converts the potentially harmful effect of continuous high-frequency operation into a benefit by using low-frequency compensation images to counteract burn-in tendencies. The compensation region, initially seeming to reduce overall display performance, actually protects against burn-in and extends OLED lifespan by balancing accumulated light-emitting time across pixels.
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 approach effectively predicts and compensates for residual image and burn-in, reducing defects and power consumption by optimizing display frequencies and reducing operational stress on the OLEDs.
Implementation Method 1
An organic light emitting diode (OLED) may be utilized a flexible display
Implementation Method 2
The residual image problem may occur because of hysteresis characteristics of the thin film transistor disposed in the pixels
Data Source
AI summary
An electronic device and method are disclosed. The electronic device includes a housing, a flexible display having a variable display area including: a visible first region, and a second region that is stowable/extendable, a display driver integrated circuit (DDI), and a processor. The processor implements the method, including: when the housing is disposed in a first state in which the second region is stowed, control the flexible display to display a user interface (UI) screen through the first region based on a first driving frequency and a first light emission frequency, control the flexible display to display a compensation image through the second region based on a second driving frequency and a second light emission frequency, wherein the second driving frequency is equal to or less than the first driving frequency, and the second light emission frequency is less than the first light emission frequency.