Signal Processing for Organic EL Display Abnormal Response Reduction
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Solution Overview
Problem
Existing organic EL display devices face challenges in maintaining high-quality image display due to abnormal responses during gradation transitions, particularly from low to high or black to white, which affect image quality and movie properties.
Innovation Solution
A signal processing method that adjusts first and second signal voltages based on gradation signals from consecutive frames, using determination units to assess low gradation conditions and adjust signal voltages accordingly, thereby reducing abnormal responses and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal voltage is adjusted based on gradation transitions from low to high, then abnormal responses during gradation transitions are reduced, but device complexity increases due to additional determination and adjustment circuits
Solution Approach 1:
The determination unit assesses whether the current frame's gradation signal indicates a low gradation state before the abnormal response can occur. By performing this determination in advance and preparing the adjustment in anticipation of the transition, the system prevents the abnormal response without requiring complex real-time intervention circuits.
Solution Approach 2:
The invention introduces an intermediate processing stage between the input gradation signal and the output signal voltage. The determination unit acts as an intermediary that evaluates the gradation state and controls the adjustment unit accordingly, mediating between the input signal and the light-emitting element to prevent abnormal responses.
2Reliability
If signal voltage adjustment is performed for every frame transition, then image quality is improved, but processing time increases
Solution Approach 1:
Instead of adjusting the signal voltage for every frame transition, the invention applies adjustment only when the determination unit detects a low gradation state. This partial action approach processes only the necessary cases that require correction, avoiding unnecessary processing time for frames that do not exhibit abnormal response conditions.
Solution Approach 2:
The determination unit performs preliminary assessment of the gradation signal to identify cases requiring adjustment before the actual signal voltage modification occurs. This preliminary identification allows the system to prepare and execute adjustments only when needed, reducing overall processing time by avoiding unnecessary adjustments in every frame.
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 method effectively reduces abnormal responses during gradation transitions, enhancing image quality and movie properties by accurately adjusting signal voltages based on gradation assessments.
Implementation Method 1
an organic electroluminescence (EL) element that includes an EL organic material and uses the phenomenon of emitting light when an electric field is applied to an organic thin film
Data Source
AI summary
A signal processing method includes inputting a first gradation signal and a second gradation signal, the first gradation signal representing a gradation of a predetermined pixel in a first frame, the second gradation signal representing a gradation of the predetermined pixel in a second frame that follows the first frame; determining whether or not the gradation of the predetermined pixel in the first frame is a low gradation based on the input first gradation signal; and adjusting one of a first signal voltage and a second signal voltage in a case where the determination result is positive, the first signal voltage defining a light-emitting brightness of a light-emitting pixel corresponding to the predetermined pixel in the first frame, the second signal voltage defining a light-emitting brightness of the light-emitting pixel in the second frame.