Display Driving Bias Voltage Control for Low-Speed Luminance Stability
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Solution Overview
Problem
Display devices, particularly organic light emitting display devices, experience image quality defects such as luminance deviation and flicker when changing driving frequencies, leading to image distortion and quality degradation.
Innovation Solution
A display device and method that apply a bias voltage to the driving transistor and control the levels of stabilization and reset voltages when changing from a high speed to a low speed driving frequency, reducing luminance degradation and improving image quality by compensating for the characteristic values of the driving transistor and resetting the light emitting element.
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 and flicker occur causing image quality degradation
Solution Approach 1:
The patent applies preliminary action by resetting the light emitting element before the frequency change takes effect. The reset operation is performed in advance during the period when the display is still operating at high speed frequency, preparing the light emitting element to prevent luminance deviation and flicker when transitioning to low speed frequency operation.
2Speed
If the driving frequency is changed from high speed to low speed, then response speed is reduced, but image quality defects such as flicker occur
Solution Approach 1:
The reset operation is performed in advance before the frequency transition completes, preparing the light emitting element to maintain stable luminance characteristics during and after the speed reduction, thereby preventing flicker and image quality defects.
3Device complexity
If no bias voltage is applied during frequency change, then device complexity is reduced, but luminance degradation occurs
Solution Approach 1:
The patent changes the voltage parameter by applying a bias voltage to the driving transistor during the frequency transition period. This parameter change compensates for the luminance degradation that would otherwise occur when switching from high speed to low speed operation, maintaining stable light output without requiring complex additional circuitry.
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.