Electrochromic Layer for OLED Chromaticity Correction
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Solution Overview
Problem
Organic electroluminescence (EL) display apparatuses face chromaticity changes due to OLED deterioration, which can be corrected by adjusting the driving current, but this accelerates deterioration and increases power consumption.
Innovation Solution
Incorporating electrochromic elements that adjust color development intensity with a DC voltage, allowing for chromaticity correction without accelerating OLED deterioration or increasing power consumption, by using a driver that stores correspondence relationships between driving time or deterioration extent and DC voltage for each electrochromic element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving current of the OLED is increased to correct chromaticity changes due to deterioration, then the emission intensity of the OLED is improved, but the deterioration of the OLED is accelerated and the lifetime is shortened
Solution Approach 1:
An electrochromic element is introduced as an intermediary component between the OLED and the viewer. This electrochromic element adjusts its light transmission properties in response to control signals, thereby compensating for the reduced emission intensity of the deteriorated OLED without requiring increased driving current to the OLED itself
Solution Approach 2:
The system changes the transmission parameter of the electrochromic element to compensate for OLED deterioration. By adjusting the electrochromic element's light transmission characteristics through applied voltage, the overall display intensity and chromaticity are maintained despite OLED degradation
2Illumination intensity
If the driving current of the OLED is increased to correct chromaticity changes due to deterioration, then the emission intensity of the OLED is improved, but the power consumption increases
Solution Approach 1:
The electrochromic element serves as a mediator that adjusts light transmission to compensate for OLED intensity loss. This approach shifts the energy adjustment mechanism from the OLED (high power consumption) to the electrochromic element (lower power consumption for transmission control)
Solution Approach 2:
The system replaces the direct electrical stimulation of OLED (high energy demand) with an optical modulation approach using the electrochromic element. Instead of forcing the deteriorated OLED to work harder electrically, the system optically adjusts the displayed light intensity through the electrochromic layer
3Manufacturing precision
If the driving current of the OLED is adjusted to correct chromaticity changes, then the chromaticity of image display is improved, but the deterioration of OLED is accelerated
Solution Approach 1:
The electrochromic element acts as a chromaticity adjustment intermediary. It can selectively modify the spectral composition of transmitted light, allowing chromaticity correction without subjecting the already deteriorated OLED to additional electrical stress that would accelerate its failure
Solution Approach 2:
The system changes the optical parameters of the electrochromic element to achieve chromaticity correction. By adjusting the electrochromic element's coloration state through voltage control, the displayed chromaticity is corrected while the OLED operates at stable, non-accelerating current levels
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 effectively corrects chromaticity changes in organic EL display apparatuses without accelerating OLED deterioration or increasing power consumption, thereby extending the display device's lifetime and optimizing energy use.
Implementation Method 1
a electrochromic element or a plurality of kinds of electrochromic elements that develop mutually different colors, the electrochromic element being disposed in the display region
Implementation Method 2
An organic EL display apparatus performs image display by using electroluminescence corresponding to a plurality of colors such as red (R), green (G), and blue (B) emitted by organic light-emitting diodes (OLEDs)
Data Source
AI summary
In an organic EL display apparatus, a chromaticity change of image display due to deterioration in an OLED is corrected. The organic EL display apparatus includes an EC element layer formed of one kind or a plurality of kinds of electrochromic elements which are disposed on an OLED portion and develop colors. Each of the electrochromic elements has a peak in a transmission spectrum during development of a color in any one of the emission wavelength bands of the pixels corresponding to the plurality of colors. The electrochromic element receives a DC voltage from a driver so as to be driven. Chromaticity of image display is adjusted by controlling a color development intensity of the electrochromic element by using the DC voltage which is applied by the driver.