OLED Display with Six Emitter Types for Power Reduction
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Solution Overview
Problem
White OLED displays suffer from efficiency losses due to the use of color filters, which reduce radiant efficiency to approximately one-third of the white emitter's efficiency, and existing methods to improve efficiency have limited effectiveness.
Innovation Solution
Incorporating three gamut-defining emitters (red, green, blue) and three additional emitters (cyan, magenta, yellow) with higher radiant efficiencies, allowing for the production of high-probability colors using the additional emitters while reserving gamut-defining emitters for low-probability colors, thereby reducing power consumption and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If color filters are used in white OLED displays to produce full-color images, then color gamut is improved, but radiant efficiency deteriorates to approximately one-third of the white emitter's efficiency
Solution Approach 1:
The display is segmented into six separate emitter types (red, green, blue gamut-defining emitters and cyan, magenta, yellow additional emitters) instead of using a single white emitter with color filters. Each emitter type is optimized for specific color ranges, eliminating the need for filters and improving overall radiant efficiency while maintaining color gamut.
Solution Approach 2:
The six emitter types serve multiple functions: the three gamut-defining emitters (red, green, blue) provide the primary color range, while the three additional emitters (cyan, magenta, yellow) fill in high-probability color regions. This multi-functional emitter system replaces the traditional white emitter plus color filter combination, achieving both full color capability and high efficiency.
2Ease of manufacture
If traditional white OLED with color filters is used, then manufacturing simplicity is maintained, but power consumption increases due to efficiency losses
Solution Approach 1:
The invention changes the fundamental parameter of emitter configuration from a single white emitter to six specialized emitters with different spectral characteristics. This parameter change enables direct light emission at the desired wavelengths without filter absorption, dramatically reducing power consumption while maintaining manufacturability through similar OLED fabrication processes.
3Manufacturing precision
If high color gamut is achieved using narrow bandpass color filters, then color accuracy is improved, but radiant efficiency further deteriorates
Solution Approach 1:
The invention extracts the color filtering function entirely by replacing it with directly emitting colored OLEDs. Instead of using narrow bandpass filters that block most light, the system uses six emitter types that directly emit the required colors, eliminating the energy loss associated with filter absorption while maintaining or improving color accuracy.
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 significantly reduces power consumption, increases display lifetime, and eliminates the need for heat sinks by utilizing more efficient emitters to produce a wider range of colors with lower power requirements.
Implementation Method 1
An organic light-emitting diode device, also called an OLED, commonly includes an anode, a cathode, and an organic electroluminescent (EL) unit sandwiched between the anode and the cathode
Data Source
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Figure 3A~3B
AI summary
Methods for displaying an image on a color display having a target display white point luminance and chromaticity, and including three gamut- defining emitters defining a display gamut and two or more additional emitters which emit light within the display gamut; the method including receiving a three- component input image signal; transforming the three-component input image signal to a five-or-more component drive signal; and providing the drive signal to display an image corresponding to the input image signal. One method provides a reproduced luminance value higher than the sum of the respective luminance values of the three components of the input signal when reproduced with the gamut-defining emitters. Another method provides reduced power in an OLED display including a white-emitting layer with three color filters for gamut-defining emitters and two or more additional color filters for three additional within-gamut emitters.