OLED Sub-Pixel Control for Temperature-Induced Color Cast
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Solution Overview
Problem
Organic Light Emitting Diode (OLED) display devices experience color cast issues due to inconsistent light emission brightness of red, green, and blue sub-pixels at varying temperatures, affecting white balance and display quality.
Innovation Solution
A display substrate with a configuration of multiple sub-pixels, including a fourth sub-pixel with the same emission color as the first sub-pixel, where the light emission is controlled based on ambient temperature to compensate for brightness changes, reducing color cast by adjusting the emission of sub-pixels accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OLED display uses standard three sub-pixel configuration (RGB), then device complexity is low, but color cast occurs at varying temperatures affecting white balance
Solution Approach 1:
The pixel is divided into four sub-pixels instead of three, with the fourth sub-pixel specifically dedicated to temperature compensation. This segmentation allows independent control of color balance without affecting the standard RGB sub-pixels, resolving the contradiction between maintaining simple configuration and achieving temperature-stable white balance.
Solution Approach 2:
The fourth sub-pixel acts as an intermediary element that mediates the temperature-induced brightness changes between the RGB sub-pixels. By introducing this intermediate component, the system can compensate for temperature variations and maintain consistent white balance without fundamentally redesigning the entire display structure.
2Reliability
If fourth sub-pixel is added for temperature compensation, then color cast is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The fourth sub-pixel is designed with specific local characteristics - its area is set to 0.5-1.5 times that of standard sub-pixels, and it uses the same emission material as one of the existing sub-pixels. This localized quality adjustment allows effective temperature compensation while maintaining compatibility with existing manufacturing processes and precision requirements.
3Reliability
If sub-pixel emission is adjusted for temperature compensation, then display quality is maintained, but control system complexity increases
Solution Approach 1:
The control system operates by periodically adjusting the emission intensity of the fourth sub-pixel based on detected temperature changes. This periodic adjustment mechanism allows the system to maintain display quality across varying temperatures through systematic, rule-based control rather than complex real-time optimization.
Solution Approach 2:
The display device incorporates temperature detection and uses this feedback to dynamically adjust the fourth sub-pixel's emission. This feedback mechanism enables automatic compensation for temperature-induced color cast without requiring complex predictive models or manual calibration.
Data Source
AI summary
The present disclosure relates to a display substrate, a display device, and a control method thereof. The display substrate includes a plurality of pixels, each of which includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel. The first sub-pixel, the second sub-pixel, and the third sub-pixel have different light emission colors. The fourth sub-pixel has the same light emission color as the first sub-pixel. The first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel all emit light, in a case where an ambient temperature is less than a first threshold. The second sub-pixel and the third sub-pixel both emit light, and one of the fourth sub-pixel and the first sub-pixel emits light, in a case where the ambient temperature is greater than or equal to the first threshold.