Display Panel Bias Control for Low-Refresh Flicker Suppression
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Solution Overview
Problem
Display devices experience image quality defects, such as flicker, due to luminance deviations when changing driving frequencies from high to low speed.
Innovation Solution
Applying a bias voltage to the driving transistor and controlling the levels of stabilization and reset voltages during frequency changes to stabilize the light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the driving frequency is changed from high speed to low speed, then power consumption is reduced, but luminance deviation occurs causing flicker and image quality degradation
Solution Approach 1:
The patent applies preliminary action by providing a bias voltage to the driving transistor before the light emitting element enters the low-speed driving mode. This preparatory voltage application prevents luminance degradation from occurring in the first place during the transition to low-speed mode, thereby maintaining image quality while enabling power savings.
2Productivity
If the driving frequency is changed from high speed to low speed, then refresh rate is reduced, but luminance degradation of light emitting element occurs
Solution Approach 1:
The bias voltage is applied in advance to the driving transistor before the light emitting element operates in low-speed mode, preventing luminance degradation before it occurs. This ensures that when the refresh rate is reduced, the luminance remains stable and consistent.
Solution Approach 2:
The patent changes the electrical parameters by adjusting the voltage levels applied to the driving transistor. By modifying the voltage parameter (applying bias voltage), the transistor's characteristics are optimized to prevent luminance degradation during low-speed operation, allowing refresh rate reduction without compromising luminance.
3Loss of energy
If the driving frequency is changed from high speed to low speed, then power consumption is reduced, but flicker occurs due to luminance deviation
Solution Approach 1:
The bias voltage is applied preliminarily to the driving transistor before low-speed mode operation begins. This preventive measure eliminates the root cause of flicker (luminance deviation) before it can manifest, allowing the display to operate at lower refresh rates without generating harmful flicker effects.
Solution Approach 2:
The patent converts the potential harmful effect of frequency transitions into a beneficial outcome by using the transition period to apply bias voltage that stabilizes the driving transistor. This transforms what would normally cause flicker and luminance deviation into an opportunity to pre-condition the circuit for stable low-speed operation.
Data Source
AI summary
Embodiments of the present disclosure relate to a display device, comprising: a display panel including a light emitting element, a driving transistor configured to provide a driving current to the light emitting element, and a plurality of switching transistors configured to control an operation of the driving transistor; a gate driving circuit configured to supply a plurality of scan signals to the display panel; a data driving circuit configured to supply a plurality of data voltages to the display panel; and a timing controller configured to control the gate driving circuit and the data driving circuit, wherein a bias voltage is supplied to the driving transistor in a first period in which the data voltage is supplied to the display panel at a low speed mode which the display panel is driven at a low speed driving frequency.