Display Panel Timing Control for Low-Frequency Voltage Stability
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Solution Overview
Problem
Display devices, particularly OLED devices, experience image quality defects such as black excitation due to voltage fluctuations during low driving frequencies.
Innovation Solution
A display device and panel design that includes specific transistor configurations and timing control to stabilize the voltage of light emitting elements, employing a bias voltage application followed by a driving voltage and reset voltage to mitigate voltage fluctuations during low driving frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the display device operates at a low driving frequency, then power consumption is reduced, but voltage fluctuation of light emitting elements occurs causing image quality defects
Solution Approach 1:
The patent applies a bias voltage to the driving transistor before applying the emission signal at low driving frequencies. This preliminary action stabilizes the transistor's operating state and prevents voltage fluctuations that would otherwise cause black excitation defects, thereby maintaining image quality while operating at reduced power consumption levels
2Speed
If the display device operates at a low driving frequency, then operating speed is reduced, but voltage stability of light emitting elements deteriorates
Solution Approach 1:
The bias voltage is applied in advance to establish a stable operating point for the driving transistor before the emission phase begins. This preliminary stabilization ensures that when the emission signal is applied later, the transistor operates with stable voltage characteristics, preventing black excitation even at low operating speeds
Solution Approach 2:
The patent dynamically adjusts the voltage application sequence based on driving frequency conditions. At low driving frequencies, the bias voltage is applied before the emission signal, whereas at high driving frequencies, the sequences are synchronized. This dynamic adaptation maintains voltage stability across different operating conditions
3Device complexity
If timing control is not applied, then device complexity is reduced, but image quality defects occur during low frequency operation
Solution Approach 1:
The timing controller implements preliminary control by applying the bias voltage before the emission signal at low driving frequencies. This temporal separation and preliminary action stabilizes the driving transistor's voltage, preventing black excitation defects without requiring additional hardware circuits
Solution Approach 2:
The timing controller monitors the driving frequency and dynamically adjusts the voltage application timing accordingly. When low driving frequency is detected, it activates the preliminary bias voltage application mode; at high frequencies, it synchronizes the sequences. This feedback-based adaptive control maintains image quality across different operating conditions
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 effectively reduces image quality defects like black excitation by maintaining stable voltage levels, improving display performance during low driving frequency operations.
Implementation Method 1
an organic light emitting diode which emits light by itself
Data Source
AI summary
The present disclosure relates to display device, display panel, and display driving method. Disclosed herein is a display device including a display panel in which a light emitting element, a driving transistor configured to provide a driving current to a light emitting element using a driving voltage, and a plurality of switching transistors configured to control driving of the driving transistor are disposed; a gate driving circuit configured to supply a plurality of scan signals to the display panel through a plurality of gate lines; an emission driving circuit configured to supply a plurality of emission signals to the display panel through a plurality of emission signal lines; a data driving circuit configured to supply a data voltage to the display panel; and a timing controller configured to, in a low speed mode in which the display panel is operated at a low driving frequency, control the driving current to be applied to the driving transistor during a first emission control period after a bias voltage is applied to the driving transistor, and control the driving current to be applied to the light emitting element through the driving transistor during a second emission control period.