OLED Brightness Compensation Plate Varying Thickness
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Solution Overview
Problem
Larger and higher resolution OLED devices experience brightness deviation due to a drop in driving current, leading to image quality degradation and non-uniform brightness.
Innovation Solution
An OLED device with a brightness compensation plate having a varying thickness is used on its substrate, which improves the uniformity of brightness by controlling light transmittance, thereby compensating for the brightness deviation without altering the driving circuit or current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels and resolution are increased to improve display quality, then the image quality is improved, but the driving current drops due to increased line resistance, causing brightness deviation
Solution Approach 1:
The patent applies local quality by creating a non-uniform thickness profile in the brightness compensation plate. The plate has greater thickness at positions corresponding to lower brightness regions (caused by higher current drop) and lesser thickness at positions corresponding to higher brightness regions. This local variation in thickness compensates for the spatially varying brightness deviation across the display panel, thereby improving overall brightness uniformity while maintaining high resolution.
2Illumination intensity
If the driving current is increased to compensate for brightness deviation, then the brightness uniformity is improved, but the power consumption and heat generation increase
Solution Approach 1:
The patent introduces a brightness compensation plate as an intermediary element between the OLED pixels and the viewer. This plate optically compensates for brightness deviation by exploiting light transmission differences through varying thickness, rather than electrically compensating by adjusting driving current. This approach achieves brightness uniformity without increasing power consumption or heat generation, as the compensation is purely optical rather than electrical.
3Ease of manufacture
If a uniform thickness brightness compensation plate is used, then the manufacturing process is simple, but it cannot compensate for the spatial variation in brightness deviation
Solution Approach 1:
The patent applies parameter changes by varying the thickness parameter of the brightness compensation plate across different spatial positions. Instead of maintaining a uniform thickness, the plate's thickness is deliberately modified to correspond to the spatial distribution of brightness deviation. This parameter variation enables effective compensation for brightness non-uniformity while still using a simple plate structure that can be manufactured using conventional techniques.
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 solution ensures uniform brightness across the OLED device by adjusting the thickness of the brightness compensation plate, effectively addressing the issue of brightness deviation caused by driving current drops, thus enhancing image quality.
Implementation Method 1
A brightness compensation plate having a thickness that varies along a length of the plate is disposed on the second surface of the substrate
Data Source
AI summary
An organic light emitting diode device includes a substrate having first and second surfaces and a diode on the first surface of the substrate. The diode includes a first electrode, a second electrode facing the first electrode and an organic emitting layer between the first and second electrodes. Light is emitted from the diode toward the first and second surfaces of the substrate. A brightness compensation plate having a thickness that varies across a length of the plate is disposed on the second surface of the substrate for transmitting the light. The brightness compensation plate may improve a uniformity of a brightness of the organic light emitting diode device.