Display Panel Brightness Compensation via Voltage Detection
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Solution Overview
Problem
Light-emitting diode display devices experience unstable driving current due to current leakage, especially under high temperature and strong light conditions, leading to decreased emission brightness and flickering issues, particularly in low frequency display processes.
Innovation Solution
A display panel with pixel driving circuits and voltage detection circuits, where the voltage detection circuit simulates the pixel driving circuit's key nodes to detect potential changes, allowing for brightness compensation by adjusting the light-emitting duration of each frame to maintain consistent brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device operates in low frequency display mode, then power consumption is reduced, but current leakage causes brightness attenuation and flickering
Solution Approach 1:
The patent applies preliminary action by detecting the potential at the first node before the light-emitting stage and using this detection result to pre-calculate and determine the light-emitting duration for each frame in advance. This allows the system to compensate for current leakage effects before they manifest as brightness issues, ensuring stable display performance during low-frequency operation while maintaining low power consumption.
Solution Approach 2:
The patent implements feedback by using the voltage detection circuit to continuously monitor the potential at the first node, which reflects the current state of the pixel driving circuit. The signal processing module processes this feedback information to determine appropriate light-emitting durations that compensate for cumulative current leakage, creating a closed-loop control system that maintains brightness stability.
2Reliability
If the light-emitting duration is extended to compensate for current leakage, then brightness stability is improved, but display refresh rate decreases
Solution Approach 1:
The patent applies local quality by differentiating the light-emitting duration for each frame based on its position in the display period. Earlier frames receive shorter durations while later frames receive extended durations to compensate for cumulative current leakage. This localized adjustment maintains overall brightness stability without uniformly reducing the refresh rate of all frames.
Solution Approach 2:
The patent implements dynamics by making the light-emitting duration variable rather than fixed. The signal processing module dynamically adjusts the duration of each frame's light-emitting stage based on real-time detection of the first node potential and the specific timing within the display period, allowing the system to adapt to changing current leakage conditions while maintaining display performance.
3Measurement precision
If voltage detection circuit is added to monitor node potentials, then brightness compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies copying by creating a simplified voltage detection circuit that mirrors the essential structure of the pixel driving circuit. The detection circuit includes a detection transistor and detection capacitor that replicate the key components of the driving circuit, allowing it to accurately simulate and detect the potential at the first node without requiring a complete duplicate of the complex driving circuitry.
Solution Approach 2:
The patent uses an intermediary approach by introducing a dedicated voltage detection circuit as a mediator between the pixel driving circuit and the signal processing module. This detection circuit translates the complex electrical states of the pixel circuit into measurable potential values at the first node, enabling accurate brightness compensation without requiring direct complex interactions between the driving circuit and control module.
Data Source
AI summary
A display panel, a brightness compensation method thereof, and a display device are provided. The display panel includes pixel driving circuits and a voltage detection circuit, the pixel driving circuit includes first to third nodes, the voltage detection circuit includes first to third detection nodes, the first to third detection nodes respectively correspond to and have potentials that are substantially the same as the first to third nodes, and the first node is electrically connected to a gate electrode of a light-emitting driving transistor. The potential of the first detection node reflects the potential of the gate electrode of the light-emitting driving transistor in the pixel driving circuit. Attenuation of brightness of the pixel driving circuit in the low frequency display process can be determined through the voltage detection circuit, thereby compensating for the light-emitting duration of the pixel driving circuit to achieve brightness compensation of the display panel.