TFT LCD Frame Rate Switching for Flicker, Noise, and Power
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Solution Overview
Problem
TFT LCD devices in portable devices face issues with screen flicker and audible noise due to fixed frame rates, which reduce image quality and increase power consumption when attempting to mitigate these issues with higher frame rates.
Innovation Solution
Adjusting the frame rate of TFT LCD devices based on the need to process audio messages, lowering it when not processing audio and increasing it when audio is involved to reduce noise and power consumption accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the frame rate is increased to reduce flicker and noise, then the image quality and audio quality improve, but the power consumption increases
Solution Approach 1:
The patent implements dynamic frame rate adjustment by detecting audio message processing states and adapting the TFT LCD panel's frame rate accordingly. The system transitions from a static frame rate to a dynamic one that changes based on operational context, using the CPU's audio processing state as the trigger for frame rate switching between 60Hz and higher frequencies.
Solution Approach 2:
The patent changes the operating parameter (frame rate) of the TFT LCD panel based on the device's operational state. When audio messages are being processed, the frame rate is increased from the standard 60Hz to a higher frequency to reduce noise and flicker. This parameter adjustment is directly tied to the audio processing state detected by the CPU, allowing optimization of display quality during critical audio moments.
2Stability of the object's composition
If the frame rate is fixed at a higher value to reduce flicker, then the image stability improves, but the overall power consumption increases
Solution Approach 1:
The patent implements periodic adjustment of the frame rate based on the periodic detection of audio processing events. Rather than maintaining a constantly high frame rate, the system periodically monitors the CPU's audio processing state and adjusts the frame rate in response to these periodic events, maintaining high stability only when necessary during audio message processing.
Solution Approach 2:
The system dynamically adapts the frame rate based on the operational context, switching between 60Hz for normal operation and higher frequencies during audio processing. This dynamic approach ensures image stability is maintained during critical audio moments while avoiding the continuous power penalty of a fixed high frame rate.
3Use of energy by moving object
If the frame rate is lowered to reduce power consumption, then the energy efficiency improves, but the noise level increases
Solution Approach 1:
The patent uses dynamic frame rate adjustment to respond to audio processing events. When the CPU detects it is processing audio messages, the frame rate is increased to reduce audible noise. This dynamic response ensures noise reduction is activated only during the specific time window when audio quality is critical, rather than continuously.
Solution Approach 2:
The system employs feedback from the CPU's audio processing state to control the frame rate. The CPU monitors its own audio processing activities and provides feedback to the display controller, which then adjusts the frame rate accordingly. This feedback loop ensures the frame rate is optimized to minimize noise during audio processing while maintaining energy efficiency during normal operation.
Data Source
AI summary
Methods for driving devices capable of displaying images and processing audio messages are provided. A representative method comprises: operating a device capable of displaying images and processing audio messages at a first operating frequency when the device is not processing audio messages; and operating the device at a second operating frequency higher than the first frequency when the device is processing audio messages.