Spatiotemporal Dithering Phase Control for Display Voltage Imbalance
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Solution Overview
Problem
Electronic displays face issues with motion blurring due to slow pixel transition times, which can be exacerbated by dithering techniques used to reduce data bits, leading to visible artifacts and voltage imbalance.
Innovation Solution
Implementing a graphics processor that periodically or aperiodically skips or alters spatiotemporal dithering patterns or phases in electronic displays, using a counter or timer to manage pixel charge and prevent voltage imbalance, thereby reducing image artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dithering techniques are used to reduce data bits for faster pixel transition, then response time is improved, but visible artifacts and voltage imbalance are generated
Solution Approach 1:
The patent applies periodic action by alternating between positive and negative DC voltage polarities across frames. The display controller inverts the polarity of voltage applied to pixels in alternating frames, creating a periodic pattern that prevents charge accumulation and reduces visible artifacts while maintaining fast response times through reduced bit depth dithering.
Solution Approach 2:
The patent changes the voltage polarity parameter periodically between frames. By inverting the DC voltage polarity (switching between positive and negative values) and adjusting the dithering pattern phase, the system maintains color accuracy while preventing harmful charge buildup and reducing visible artifacts.
2Illumination intensity
If DC voltage is applied to pixels to display colors, then color rendering is achieved, but pixel damage occurs over time
Solution Approach 1:
The patent implements periodic polarity inversion where the DC voltage applied to each pixel alternates between positive and negative values in successive frames. This periodic reversal prevents sustained electrical stress on pixel components, extending their operational life while maintaining color rendering capability through the alternating voltage application.
Solution Approach 2:
The patent applies inversion by reversing the polarity of the DC voltage applied to pixels. Instead of maintaining a constant positive voltage, the system inverts the voltage polarity between frames (positive then negative), which counteracts charge accumulation and prevents pixel damage while preserving color display functionality.
3Reliability
If voltage polarity is alternated to prevent pixel damage, then pixel reliability is improved, but charge imbalance occurs
Solution Approach 1:
The patent dynamically adjusts the dithering pattern phase parameter in response to detected charge imbalance conditions. When charge imbalance is detected, the system shifts the phase of the dithering pattern, which redistributes the temporal distribution of voltage applications across pixels, thereby correcting charge imbalance while maintaining the protective polarity alternation.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor pixel charge states and adjust the dithering pattern phase accordingly. The display controller detects charge imbalance conditions and dynamically modifies the dithering phase to compensate, creating a closed-loop system that maintains charge balance while preserving pixel reliability through continued polarity alternation.
Data Source
AI summary
Devices and methods for error diffusion and spatiotemporal dithering are provided. By way of example, a method of operating a display includes receiving a pixel input, a set of pixel coordinates, and a current frame number. A kernel and a particular kernel bit of the kernel is selected from a set of kernels, based upon the pixel input, the pixel coordinates, the frame number, or any combination thereof. A dithered output is determined based at least in part upon the kernel bit. When the display is in a diamond pixel configuration, the dithered output is applied in accordance with a diamond pattern formed by red, blue, or red and blue pixel channels.