Quantum Dot Display Circuit Corrects Color Shift
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Solution Overview
Problem
In display devices with quantum dot light-emitting layers, self-absorption and re-emission of light lead to a color shift, especially in high gray scale displays, due to the shifting light emission wavelength characteristic.
Innovation Solution
A display device configuration that includes three subpixels with quantum dot light-emitting layers for red, green, and blue colors, along with a data processing circuit that receives input data for each subpixel and generates output data to correct for color shift by adjusting the data voltages supplied to the subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a quantum dot light-emitting layer is provided in each subpixel, then color rendering is improved, but color shift occurs due to self-absorption and re-emission of light
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values in a lookup table before actual display operation. The data processing circuit retrieves appropriate correction values based on input data and applies them to compensate for self-absorption effects, thereby maintaining color rendering accuracy without requiring real-time complex calculations during display operation.
Solution Approach 2:
The patent changes parameters by adjusting the data voltages supplied to each subpixel based on correction values. The data processing circuit modifies the voltage parameters dynamically according to the quantum dot layer's self-absorption characteristics, transforming the electrical input parameters to compensate for optical losses and wavelength shifts in the quantum dot light-emitting layers.
2Productivity
If quantum dot light-emitting layers are used in subpixels, then emission efficiency is improved, but light self-absorption causes wavelength characteristic shift
Solution Approach 1:
The patent implements feedback by continuously monitoring and correcting the output based on predicted self-absorption effects. The data processing circuit uses correction values derived from the quantum dot layer's characteristics to adjust the input data, creating a feedback loop that compensates for wavelength shifts and maintains stable emission characteristics across different gray scales.
Solution Approach 2:
The patent applies preliminary action by pre-calculating correction values based on the quantum dot layer's self-absorption properties before actual display operation. The lookup table stores these pre-computed corrections, allowing the system to compensate for wavelength characteristic shifts without requiring real-time complex calculations during display operation.
3Measurement precision
If data processing correction is applied to suppress color shift, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values in a lookup table before actual display operation. This approach shifts the computational complexity from real-time processing during display to offline pre-processing, significantly reducing the processing burden during actual image rendering while maintaining color accuracy.
Solution Approach 2:
The patent uses a lookup table that stores pre-computed correction values as a simplified representation of the complex quantum dot self-absorption characteristics. Instead of performing complex real-time calculations, the system retrieves pre-stored correction data, effectively copying the results of complex computations into a simpler, faster-to-access format.
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 proposed solution effectively suppresses color shift in display devices with quantum dot light-emitting layers, maintaining accurate color representation across various gray scales.
Implementation Method 1
using quantum dots, which absorb excitation light and emit light having a longer wavelength than the excitation light
Implementation Method 2
some of the light emitted from the quantum dot light-emitting layer is self-absorbed by the quantum dot light-emitting layer and then re-emitted
Data Source
AI summary
A display device includes: a first subpixel including a quantum dot light-emitting layer configured to emit light of a first color: a second subpixel including a quantum dot light-emitting layer configured to emit light of a second color different from the light of the first color: a third subpixel including a quantum dot light-emitting layer configured to emit light of a third color different from the light of the first color and the light of the second color: and a data processing circuit configured to receive a first input data corresponding to the first subpixel, a second input data corresponding to the second subpixel, and a third input data corresponding to the third subpixel. The data processing circuit generates first output data corresponding to a first data voltage supplied to the first subpixel by using the first input data, the second input data, and the third input data.