Gamma Voltage Conversion Circuit Using Gray Code for OLED Noise Reduction
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Solution Overview
Problem
Conventional gamma voltage conversion circuits for OLED displays suffer from significant noise and slow response speed, leading to grayscale display brightness jitter and poor brightness uniformity.
Innovation Solution
A gamma voltage conversion circuit utilizing a first voltage divider circuit, Gray code control circuit, and encoding circuit to generate analog grayscale voltage signals, employing a Gray code to minimize simultaneous bit changes during grayscale transitions, thereby reducing noise and improving response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional gamma voltage conversion circuit is used, then the circuit structure is simple, but the response speed is slow and noise is significant
Solution Approach 1:
The gamma voltage conversion circuit is divided into multiple independent gamma channels (first gamma channel, second gamma channel, etc.), each processing specific grayscale ranges. This segmentation allows parallel processing of different grayscale values, significantly improving response speed while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The patent introduces a dual-channel architecture that processes grayscale values in parallel dimensions. The first gamma channel handles lower grayscale ranges while the second gamma channel handles higher grayscale ranges, enabling simultaneous processing that transforms the sequential operation into parallel operation, thereby improving response speed
2Reliability
If a conventional gamma voltage conversion circuit is used, then the circuit design is straightforward, but grayscale display brightness jitter occurs
Solution Approach 1:
The patent introduces Gray code control signals as an intermediary mechanism between the digital grayscale input and the analog gamma voltage output. The Gray code ensures that only one bit changes at a time during grayscale transitions, preventing simultaneous switching of multiple bits that would cause brightness jitter, thereby improving reliability
Solution Approach 2:
The circuit incorporates output control circuits that monitor and adjust the analog voltage signals based on the Gray code control signals. This feedback mechanism ensures accurate voltage output and smooth grayscale transitions, eliminating brightness jitter and improving display reliability
3Object-generated harmful factors
If conventional voltage conversion method is used, then the implementation is simple, but noise is significant and response speed is slow
Solution Approach 1:
By segmenting the gamma voltage conversion into multiple independent channels, each channel processes a specific portion of the grayscale range with dedicated encoding circuits. This segmentation isolates noise sources in different channels and prevents noise accumulation, reducing overall noise levels while maintaining circuit complexity at acceptable levels through modular organization
Solution Approach 2:
The patent employs dynamic switching mechanisms controlled by Gray code signals that adaptively select which gamma channel is active based on the current grayscale value. This dynamic operation allows the circuit to optimize its response characteristics for different grayscale ranges, improving response speed and reducing noise through intelligent resource allocation
Data Source
AI summary
A gamma voltage conversion circuit includes: a first voltage divider circuit having first input terminals and first voltage divider output terminals, wherein each first input terminal is configured to receive a first gamma voltage signal, the first voltage divider circuit is configured to generate first analog voltage signals according to the first gamma voltage signal, and each first voltage divider output terminal is configured to output one of the first analog voltage signals; a Gray code control circuit configured to generate and output a Gray code control signal according to a grayscale value to be displayed; a first encoding circuit configured to generate and output second analog voltage signals according to the Gray code control signal and one of the plurality of first analog voltage signals; and a first output control circuit configured to generate and output an analog grayscale voltage signal according to the second analog voltage signals.