Output Control Circuit for Divided Display Driving Frequencies
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Solution Overview
Problem
Existing display technologies face challenges in reducing power consumption, particularly when displaying static images or operating in always-on modes, as the driving frequency of the display panel cannot be adequately decreased due to dependencies on previous stage carry signals.
Innovation Solution
A gate signal masking circuit is introduced to support multiple divisions of the driving frequency, incorporating a gate signal block and an output control signal block with an inverter circuit and output determining circuit to control gate signal output based on enable and emission signals, utilizing P-type and N-type transistors to manage signal levels and frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the gate driver receives carry signals from previous stages to output gate signals, then the gate signal can be properly generated and transmitted, but the driving frequency of some portions of the display panel cannot be decreased, preventing power consumption reduction
Solution Approach 1:
An output control circuit is introduced as an intermediary component between the gate driver stage and the display panel. This circuit receives gate signals from the gate driver and selectively outputs them based on control signals, enabling independent frequency control of different display regions without affecting the gate driver's operation. The intermediary allows decoupling of the gate driver frequency from the actual display refresh frequency in static regions.
Solution Approach 2:
The display panel is divided into multiple regions with different driving requirements - static image regions and moving image regions. The output control circuit enables different portions of the display panel to operate at different frequencies, with static regions using divided/fractional frequencies and moving regions using full frequency, thus segmenting the driving frequency control.
2Use of energy by stationary object
If the driving frequency is reduced for static images to save power, then power consumption decreases, but the gate driver cannot properly output gate signals due to carry signal dependencies
Solution Approach 1:
The output control circuit acts as a mediator that receives reliable gate signals from the gate driver operating at full frequency and selectively gates them for output. This maintains the reliability of gate signal generation in the gate driver while allowing reduced frequency operation at the display panel level, thus preserving reliability while reducing power consumption.
Solution Approach 2:
The system dynamically adjusts the output frequency based on the content being displayed. When static images are detected in certain regions, the output control circuit divides the frequency for those regions. When moving images are detected, full frequency is maintained. This dynamic adaptation allows the system to optimize power consumption while maintaining gate signal reliability where needed.
Data Source
AI summary
An output control circuit may comprise an inverter circuit configured to convert an emission signal to an inverted emission signal and an outputting determining circuit configured to generate an output control signal based on an enable signal, the emission signal, and the inverted emission signal.