OLED Luminance Compensation via Light Sensing Unit
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Solution Overview
Problem
Organic light-emitting display apparatuses experience luminance reduction over time due to device deterioration, leading to decreased light emission, which existing technologies fail to effectively compensate for.
Innovation Solution
An organic light-emitting display apparatus is designed with a light sensing unit and optical member, including a photo sensor and a reflective pattern on a black matrix, to detect luminance degradation and compensate by adjusting power supply, utilizing a top emission type organic light-emitting device and an optical member with a polarizer and retardation film to reduce external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If organic light-emitting devices are used to generate light, then high response speed and low power consumption are achieved, but luminance reduction occurs due to device deterioration
Solution Approach 1:
A light sensing unit is integrated into the display apparatus to detect the luminance of emitted light in real-time. The detected luminance information is fed back to a compensation circuit that adjusts the driving current or voltage applied to the organic light-emitting devices, thereby compensating for luminance reduction caused by deterioration and maintaining stable display performance.
2Reliability
If a light sensing unit is added to detect luminance, then compensation for luminance reduction becomes possible, but device complexity increases
Solution Approach 1:
The light sensing unit is designed to serve multiple functions: it detects luminance for compensation purposes, and can also function as part of the display structure itself. The sensing unit shares structural elements with the display panel, such as using similar substrate and electrode configurations, thereby reducing overall device complexity while maintaining compensation functionality.
3Illumination intensity
If optical members are added to reduce external light reflection, then display performance is maintained, but device complexity increases
Solution Approach 1:
The optical members designed to reduce external light reflection are integrated directly into the existing display panel structure. The anti-reflection coating is applied as part of the substrate treatment process, and the optical layers are combined with the encapsulation structure, thereby achieving reflection reduction without significantly increasing device complexity.
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
The apparatus effectively compensates for luminance reduction by detecting light emission changes and adjusting power, maintaining display performance through the use of a light sensing unit and optical member, thereby extending the lifespan of the organic light-emitting display.
Implementation Method 1
an organic light-emitting display apparatus including organic light-emitting devices (e.g., organic light-emitting diodes) displays an image by using the organic light-emitting devices to generate light due to the recombination of electrons and holes
Implementation Method 2
a light sensing unit at one side of the organic light-emitting display panel... including a photo sensor facing a side of the organic light-emitting display panel
Implementation Method 3
a reflective pattern formed on the black matrix
Implementation Method 4
the optical member may include a neutral density film and an anti-reflection film on the neutral density film
Data Source
AI summary
An organic light-emitting display apparatus includes an organic light-emitting display panel having a display area including a plurality of pixel areas and a non-display area adjacent the display area; and a light sensing unit. The organic light-emitting display panel includes a first substrate including an organic light-emitting device on a first base substrate and a second substrate including a black matrix between the plurality of pixel areas on a surface of a second base substrate facing the first substrate and a reflective pattern formed on the black matrix. The light sensing unit is at one side of the organic light-emitting display panel.