Display Module Selecting Circuit Voltage Adjustment Flicker Reduction
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Solution Overview
Problem
Display devices face the challenge of reducing power consumption while minimizing the occurrence of display flicker phenomena when switching between high and low refresh rates, as high refresh rates increase power consumption but lead to flicker issues, and low refresh rates cause flicker effects due to brightness changes.
Innovation Solution
The implementation of a display module with a pixel circuit comprising a driving transistor, a reset transistor, and a capacitor, where selecting circuits output different initial voltages during reset and light-emitting phases to reduce leakage currents and maintain consistent brightness, thereby minimizing the probability of display flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high refresh rate is used to display animations, then dynamic fuzziness is reduced, but power consumption increases
Solution Approach 1:
The display device dynamically adjusts the refresh rate based on the type of content being displayed. When displaying static images, the refresh rate is reduced to lower power consumption. When displaying animations or video content, the refresh rate is increased to reduce dynamic fuzziness. This dynamic adaptation resolves the contradiction by optimizing the refresh rate parameter according to actual display needs.
2Use of energy by moving object
If a low refresh rate is used to reduce power consumption, then energy efficiency improves, but display flicker occurs
Solution Approach 1:
The invention changes the voltage parameter applied to the reset transistor to compensate for leakage current effects at low refresh rates. By adjusting the voltage level, the display maintains stable brightness even when the refresh rate is reduced, thereby preventing flicker while preserving energy efficiency.
3Use of energy by moving object
If the refresh rate is switched between high and low, then power consumption is optimized, but brightness changes cause display flicker
Solution Approach 1:
The invention applies a preliminary voltage adjustment to the reset transistor before the refresh rate switching occurs. This preliminary action compensates for the expected leakage current changes, ensuring that brightness remains consistent when transitioning between high and low refresh rates, thereby preventing display flicker.
Solution Approach 2:
The display device monitors the actual brightness output and adjusts the reset transistor voltage accordingly to maintain consistent perceived brightness across different refresh rates. This feedback mechanism ensures that power consumption optimization does not result in visible brightness fluctuations.
Data Source
AI summary
A display module, a display drive circuit, and an electronic device. The display module includes a display and at least one driver group. The display includes M rows of sub-pixels arranged in a matrix form. Each sub-pixel includes a driving transistor, a first reset transistor, a first capacitor, and a light emitting device. Each driver group includes M selecting circuits. The Nth selecting circuit is coupled to a second node of a first reset transistor in the Nth row of sub-pixels. The selecting circuit is configured to output a second initial voltage Vint2 to the second node, and is configured to output a first initial voltage Vint1 to the second node, where |Vint2|>|Vint1|.