OLED Pixel Structure with Selective Light Filtering for Blue Efficiency
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Solution Overview
Problem
In organic light-emitting-diode (OLED) displays, the use of color resistance blocks to achieve wide color gamut results in decreased luminous efficiency, particularly for blue OLEDs, leading to high power consumption and short device lifetime.
Innovation Solution
A pixel structure with light filtering portions provided only for specific organic light emitting diodes, such as red and green, while blue OLEDs do not have a light filtering portion, allowing light from blue OLEDs to pass directly, thereby improving luminous efficiency and extending device lifetime without affecting color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color resistance blocks are provided for all OLEDs to achieve wide color gamut, then color purity is improved, but luminous efficiency decreases significantly
Solution Approach 1:
The patent applies local quality by providing color resistance blocks only for red and green OLEDs, while blue OLEDs are left without color resistance blocks. This localized application allows red and green sub-pixels to achieve good color purity through filtering, while blue sub-pixels maintain their inherently high luminous efficiency without the energy loss associated with color filtering.
2Measurement precision
If color resistance blocks are provided for all OLEDs, then color gamut is improved, but power consumption increases
Solution Approach 1:
The patent implements local quality by selectively applying color resistance blocks only to red and green OLEDs. This approach achieves wide color gamut for the display while avoiding the additional power consumption that would result from adding color resistance blocks to blue OLEDs, thereby reducing overall power consumption of the display device.
3Measurement precision
If color resistance blocks are provided for all OLEDs, then color purity is improved, but device lifetime decreases
Solution Approach 1:
The patent applies local quality by providing color resistance blocks only for red and green OLEDs, while blue OLEDs operate without such blocks. Since blue OLEDs have lower inherent luminous efficiency and shorter lifetime, avoiding the additional energy loss from color resistance blocks extends their operational life, thereby extending the overall device lifetime.
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
Significantly improves the luminous efficiency of blue OLEDs while maintaining color purity, reducing power consumption and extending the display device's lifetime.
Implementation Method 1
have a working principle that the organic function layers is driven by an electrical field between the anodes and the cathodes so that light can be emitted due to injection and recombination of carriers
Implementation Method 2
a red color resistance block 2r corresponding to a red OLED 1r, a green color resistance block 2g corresponding to a green OLED 1g and a blue color resistance block 2b corresponding to a blue OLED 1b are respectively arranged so as to filter light emitted by each light emitting diode
Data Source
AI summary
The present invention discloses a pixel structure, an organic light emitting display panel and a method for fabricating the same, and a display device. The pixel structure includes a plurality of organic light emitting diodes capable of emitting light of multiple colors and a plurality of light filtering portions provided at a light emitting side of the plurality of organic light emitting diodes, wherein each light filtering portion is provided in correspondence with each of a part of the organic light emitting diodes, such that light emitted from each of the part of the organic light emitting diodes passes through corresponding light filtering portion while light emitted from the remaining of the organic light emitting diodes does not pass through any light filtering portion, and the light filtering portions each process light having a color corresponding to the color of light emitted by corresponding organic light emitting diode.