Power Supply Line Drive Circuit for Organic EL Display Flicker Control
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Solution Overview
Problem
Existing organic EL display panels face challenges in balancing favorable moving image performance and flicker suppression while varying peak luminance levels, as longer emission periods enhance luminance but degrade moving image response, and shorter periods improve response but increase flicker visibility.
Innovation Solution
A semiconductor integrated circuit and display panel system that employs a power supply line drive circuit to apply pulse-shaped drive potentials during emission periods and an off-state voltage during non-emission periods, allowing for variable peak luminance control without changing the emission period length, thereby minimizing changes in displaying quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the emission period length is increased to achieve higher peak luminance level, then the luminance level is improved, but the moving image response characteristic deteriorates
Solution Approach 1:
The patent applies periodic pulsed drive potentials during the emission period instead of continuous drive. The drive circuit supplies multiple pulses with intermediate amplitudes distributed throughout the emission period, replacing the conventional single continuous drive approach. This periodic action maintains the total emission duration while achieving luminance control through pulse frequency and amplitude modulation, thereby improving moving image response without sacrificing peak luminance.
2Speed
If the emission period length is decreased to improve moving image response characteristic, then the moving image response is improved, but the peak luminance level decreases and flicker visibility increases
Solution Approach 1:
The drive circuit supplies multiple pulsed drive potentials during the emission period with intermediate amplitudes, distributing the drive energy throughout the emission duration. This periodic pulsing maintains the emission period length for flicker suppression while achieving improved moving image response through the temporal distribution of drive energy, preventing luminance dropout without requiring shorter emission periods.
3Speed
If the emission period length is decreased to improve moving image response characteristic, then the moving image response is improved, but the flicker suppression performance deteriorates
Solution Approach 1:
The patent maintains a fixed emission period length while applying periodic pulsed drive potentials throughout this period. The consistent emission period duration ensures adequate duty cycle for flicker suppression, while the pulsed drive structure within the period improves moving image response. The periodic pulses are distributed to maintain average luminance levels, preventing the flicker that would result from shortened emission periods.
Data Source
AI summary
A semiconductor integrated circuit and corresponding display panel and electronic apparatus. A pixel element includes a self-luminous element and a drive transistor connected to a power supply line. In an emission period of the self-luminous element, an active voltage and an intermediate voltage are sequentially applied between the power supply line and a potential line with a pulse-shaped waveform such that a predetermined luminance duration is obtained in the emission period. In a non-emission period of the self-luminous element, an off-state voltage is applied between the power supply line and the potential line so as to maintain the self-luminous element in a non-emission state.