Display Panel Driving Circuit for Inorganic Light Emitting Device Color Accuracy
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Solution Overview
Problem
Inorganic light emitting devices in display panels face issues with color reproducibility due to wavelength shifts caused by varying driving currents, leading to reduced image quality and inconsistencies in large-area tiled displays.
Innovation Solution
A display panel design incorporating a driving circuit layer on a glass substrate with both pulse amplitude modulation (PAM) and pulse width modulation (PWM) driving circuits to control the amplitude and duration of the driving current for inorganic light emitting devices, ensuring stable operation and improved color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the amplitude of driving current is increased to improve brightness, then brightness is improved, but wavelength shifts occur causing color reproducibility to deteriorate
Solution Approach 1:
The patent implements a dual modulation system where PAM dynamically adjusts current amplitude for brightness control, while PWM dynamically adjusts pulse width to compensate for wavelength shifts. This dynamic coordination allows the system to maintain color accuracy across different brightness levels by independently controlling both amplitude and temporal characteristics of the driving current.
Solution Approach 2:
The patent changes multiple parameters of the driving current simultaneously - both amplitude (via PAM) and pulse width (via PWM). By adjusting these parameters in a coordinated manner, the system can achieve different brightness levels while maintaining consistent wavelength and color reproduction, effectively decoupling brightness control from color stability.
2Device complexity
If a single driving circuit is used to simplify device complexity, then device complexity is reduced, but the ability to independently control amplitude and duration of driving current is insufficient
Solution Approach 1:
The patent segments the driving circuit into two functionally independent modules: a PAM driving circuit responsible for amplitude control and a PWM driving circuit responsible for pulse width control. This segmentation allows each circuit to specialize in one control dimension, providing fine-grained independent control over both amplitude and duration of the driving current while maintaining a modular and manageable system architecture.
Solution Approach 2:
The patent creates a universal driving system where the PAM and PWM circuits work together to provide multi-dimensional control capability. The PAM circuit handles amplitude modulation for brightness, while the PWM circuit handles pulse width modulation for temporal control and wavelength stabilization. This multi-functional approach enables a single driving system to address multiple control requirements simultaneously.
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 prevents wavelength shifts and corrects color deviations, enhancing color reproducibility and brightness uniformity across the display panel, even in large-area tiled configurations.
Implementation Method 1
the PAM driving circuit is configured to control an amplitude of a driving current provided to the inorganic light emitting device
Implementation Method 2
the PWM driving circuit is configured to control a light emitting duration of the inorganic light emitting device
Implementation Method 3
an inorganic light emitting device mounted on the driving circuit layer and electrically connected to the first driving circuit, the inorganic light emitting device comprising a sub pixel of the display panel
Data Source
AI summary
A display panel includes a driving circuit layer disposed on a glass that includes a first driving circuit and a second driving circuit, and an inorganic light emitting device mounted on the driving circuit layer to be electrically connected to the first driving circuit. The inorganic light emitting device includes a sub pixel of the display panel. The first driving circuit is located in an area where the inorganic light emitting device is mounted, while the second driving circuit is arranged in an area excluding an area in which the first driving circuit is arranged in the driving circuit layer. The second driving circuit generates a control signal for driving the first driving circuit and provide the generated control signal to the first driving circuit.