Display Device Tone Voltage Generation for Smooth Tone Rendering
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Solution Overview
Problem
The FBI driving method for display devices struggles to achieve smooth tone display due to steep changes in combined relative brightness between light and dark frames, making it difficult to realize smooth tone rendering even with adjusted voltage values.
Innovation Solution
A display device with a video line driving circuit that supplies distinct tone voltages for each frame period, using a tone reference voltage generating circuit to generate different tone reference voltages for light and dark frames, allowing for independent adjustment of tone voltages to achieve smooth tone display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common tone voltage is used for both light frame and dark frame in FBI driving method, then the device complexity is reduced, but the smooth tone display quality deteriorates due to steep changes in combined relative brightness
Solution Approach 1:
The patent divides the tone voltage generation into separate segments for light frame and dark frame. The tone voltage generating circuit generates different tone voltages based on whether the current frame is a light frame or dark frame, allowing independent optimization of brightness characteristics for each frame type to achieve smooth tone display.
Solution Approach 2:
The patent makes the tone voltage generation dynamic by switching between different tone voltage sets based on frame type. The tone reference voltage generating circuit dynamically selects appropriate reference voltages and the tone voltage generating circuit adjusts tone voltages in real-time based on frame characteristics, enabling adaptive brightness control.
2Manufacturing precision
If tone voltages are adjusted to reduce brightness change steepness, then the smooth tone display quality improves, but the device complexity increases due to separate tone voltage generation for light and dark frames
Solution Approach 1:
The tone reference voltage generating circuit serves multiple functions by generating different tone reference voltages for light frames and dark frames using the same basic circuit architecture. This multi-functionality allows the system to achieve smooth tone display without requiring entirely separate voltage generation systems, balancing performance and complexity.
3Speed
If the response speed of the display device is improved, then the animated image blur is reduced, but the retina persistence effect cannot be completely resolved
Solution Approach 1:
The patent employs periodic action by alternating between light frame and dark frame display in a structured sequence. The FBI driving method uses periodic switching of tone voltages between light and dark frames to virtually display intermediate tones, which helps manage the retina persistence effect and reduce animated image blur through controlled temporal modulation.
Data Source
AI summary
When one frame period of two consecutive frame periods is a frame A and a next frame period subsequent to the frame A is a frame B, a tone requested from an external system is displayed in each sub-pixel by displaying two tones during the two frame periods including the frame A and the frame B, display data of an image A displayed during a period of the frame A and display data of an image B displayed during a period of the frame B are display data generated based on the display data and a video line driving circuit supplies, as tone voltages corresponding to the display data, a first set of tone voltages to video lines during the period of the frame A and a second set of tone voltages to the video lines during the period of the frame B subsequent to the frame A.