OLED Driving Transistor Biasing for Low-Frequency Flicker Control
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Solution Overview
Problem
Display devices, particularly organic light emitting display devices, experience image quality defects such as flicker and luminance deviation when changing driving frequencies, leading to image distortion during transitions from high to low speed driving frequencies.
Innovation Solution
Applying a bias voltage to the driving transistor and controlling the levels of stabilization and reset voltages during transitions from high to low speed driving frequencies to stabilize the light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the driving frequency is changed from high speed to low speed, then power consumption is reduced, but luminance deviation and image quality defects occur
Solution Approach 1:
The patent applies preliminary action by supplying a bias voltage to the driving transistor before the light emitting element is driven at the low speed driving frequency. This preliminary bias voltage application prepares the driving transistor to maintain stable electrical characteristics during the frequency transition, preventing luminance deviation and image quality defects that would otherwise occur when switching from high speed to low speed mode.
2Object-affected harmful factors
If the driving frequency is changed from high speed to low speed, then flicker is reduced, but luminance degradation occurs
Solution Approach 1:
The patent applies preliminary anti-action by supplying a bias voltage to the driving transistor in advance before the light emitting element is driven at low speed. This bias voltage counteracts the potential luminance degradation that would occur during frequency transition, preventing the harmful effect before it manifests. The bias voltage maintains the driving transistor's electrical characteristics stable, thereby preventing both flicker and luminance degradation simultaneously.
3Adaptability or versatility
If the driving frequency is changed, then operation mode flexibility is improved, but image distortion occurs
Solution Approach 1:
The patent applies preliminary action by preparing the driving transistor with a bias voltage before transitioning between different operation modes and driving frequencies. This preliminary preparation ensures that the electrical characteristics of the driving transistor remain stable during mode switching, preventing image distortion while maintaining the flexibility to switch between different operation modes as needed.
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.