Display Device Driving Method with Variable Light-Emitting Periods
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Solution Overview
Problem
Existing display devices face challenges in maintaining consistent image quality due to variations in pixel voltage over time, leading to degradation in image performance.
Innovation Solution
A display device and driving method that incorporate a first drive mode with varying light-emitting periods, where one period is longer and another is shorter than the initial period, and adjust time intervals between these periods to optimize image quality by dynamically managing write driving and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a display device uses a single light-emitting period with fixed duration, then the driving scheme is simple, but image quality degrades due to pixel voltage variation over time
Solution Approach 1:
The light-emitting period is divided into multiple sub-periods (first light-emitting period, second light-emitting period, third light-emitting period) with different durations. This segmentation allows the display device to refresh pixel voltages at different rates during different phases, compensating for voltage decay and maintaining consistent image quality without requiring a completely complex driving architecture.
Solution Approach 2:
The light-emitting periods are designed with dynamic duration variations rather than a fixed duration. The first light-emitting period has a different duration than the second and third periods, creating a dynamic refresh pattern that adapts to pixel voltage decay characteristics. This dynamic approach maintains image quality consistency while avoiding the need for continuously adjustable complex circuits.
2Manufacturing precision
If the display device increases refresh frequency to maintain pixel voltage, then image quality is maintained, but power consumption increases
Solution Approach 1:
Instead of uniformly refreshing all pixels at high frequency continuously, the patent applies partial refresh actions with varying durations. The first light-emitting period has a different duration than subsequent periods, providing just enough refresh action to maintain image quality without excessive power consumption. This partial action approach refreshes pixels sufficiently to prevent voltage decay effects while avoiding continuous high-frequency operation that would waste energy.
3Manufacturing precision
If the display device uses varying light-emitting period durations, then image quality is enhanced, but the driving control becomes more complex
Solution Approach 1:
The patent implements a periodic driving scheme where light-emitting periods repeat in a fixed pattern (first period with duration T1, followed by second period with duration T2, followed by third period with duration T2). This periodic structure provides varying duration benefits for image quality while maintaining relatively simple control logic, as the pattern repeats predictably without requiring complex real-time adjustments.
Data Source
AI summary
A display device according to the disclosure includes: a display section having a plurality of unit pixels; and a driving section that, in a first drive mode, performs write driving and thereafter performs light emission driving in a plurality of light-emitting periods on each of the unit pixels. One of predetermined number of light-emitting periods out of the plurality of light-emitting periods other than a first light-emitting period is longer than the first light-emitting period, and another one of the predetermined number of light-emitting periods is shorter than the first light-emitting period.