Flexible Display Gate Driver Impedance Control for Power Reduction
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Solution Overview
Problem
Flexible displays face challenges in reducing energy consumption while maintaining large sizes and portability, as existing technologies do not effectively manage power usage, especially when the display is bent or curved.
Innovation Solution
Incorporating a bending sensing unit with impedance control circuitries, such as variable resistors and capacitors, that adjust impedance based on the display's curvature to control the transmission of trigger pulses between shift register circuitries, thereby disabling unnecessary stages and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the display panel is made flexible to enable portability and large display sizes, then ease of operation and display area are improved, but power consumption increases due to continuous refreshing of all pixels
Solution Approach 1:
The display panel is divided into multiple scanning zones corresponding to different shift register stages. The bending sensing unit segments the display into curved and non-curved regions, allowing independent control of refreshing operations in each segment. Only pixels in non-curved regions are refreshed, while pixels in curved regions are disabled, reducing overall power consumption.
Solution Approach 2:
The system dynamically adjusts the refreshing operation based on the real-time bending state of the display panel. The bending sensing unit continuously monitors curvature changes, and the gate driver dynamically modifies which shift register stages are enabled accordingly. This dynamic adaptation allows the display to optimize power consumption while maintaining flexibility and portability.
2Reliability
If all stages of shift register circuitries are enabled to refresh all pixels, then display completeness is improved, but power consumption increases
Solution Approach 1:
Instead of refreshing all pixels in the display panel, the system performs partial refreshing only on pixels located in non-curved regions. The bending sensing unit identifies curved portions where pixel refresh is unnecessary, and the gate driver selectively disables corresponding shift register stages. This partial action approach maintains display completeness for visible regions while significantly reducing power consumption by skipping refresh operations in curved areas.
3Use of energy by moving object
If impedance control circuitries are added to control trigger pulse transmission, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The impedance control circuitries modify their electrical impedance parameters based on the bending state of the display panel. When a curved region is detected, the impedance control circuitry changes its impedance to block trigger pulse transmission to subsequent shift register stages. This parameter change approach provides an elegant solution to reduce power consumption without requiring complex mechanical switches or additional control logic, as the impedance modulation is achieved through existing circuit elements responding to bending-induced physical changes.
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
This solution effectively reduces power consumption by preventing unnecessary pixel refreshing on curved portions of the display, optimizing energy use while maintaining display functionality across different bending states.
Implementation Method 1
The impedance control circuitry has different impedances according to bending of the display panel
Implementation Method 2
The impedance control circuitry comprises a variable resistor. The variable resistor has different impedances according to the bending of the display panel
Implementation Method 3
The impedance control circuitries are electrically coupled to the control terminal and have a first capacitor, and are configured to change a capacitance value of the first capacitor according to sensed pressure to control the voltage potential of the control terminal
Data Source
AI summary
A flexible display includes a display panel, a gate driver, and a bending sensing unit. The display panel has a plurality of rows of pixels arranged in sequence. The gate driver has a plurality of stages of shift register circuitries electrically coupled to each other in sequence. The shift register circuitries are electrically coupled to the plurality of rows of pixels, and are configured to provide a plurality of refreshing pulses for driving the plurality of rows of pixels to refresh. Each stage of the shift register circuitries are further configured to provide a trigger pulse to drive another stage of the shift register circuitries. The bending sensing unit is electrically coupled to the gate driver. The bending sensing unit is configured to control, according to bending of the display panel, the impedance of a path used by at least one of the stages of the shift register circuitries to transmit the trigger pulse to the other stage of the shift register circuitries.