Display Control Device for Threshold Voltage Compensation
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Solution Overview
Problem
In emissive display technologies, the variation in threshold voltage across transistors with different applied voltages leads to inadequate compensation, resulting in suboptimal performance, especially when one sub-pixel has a luminance of 0, affecting the overall display quality and power consumption.
Innovation Solution
A display control device that includes an input part for receiving RGB input signals, a selection part to select pixels, and an output part to control the luminances of sub-pixels, ensuring that at least one sub-pixel of the non-selection pixel has a luminance of 0, while the fourth sub-pixel of the selection pixel also has a luminance of 0, thereby compensating for threshold voltage variations and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one sub-pixel is set to have luminance of 0 to simplify control, then device complexity is reduced, but threshold voltage compensation becomes inadequate due to large voltage differences between transistors
Solution Approach 1:
The patent implements periodic switching between selection pixels and non-selection pixels across different frames. Each pixel alternates between being a selection pixel (with all sub-pixels potentially active) and a non-selection pixel (with one sub-pixel forced to 0 luminance). This periodic action ensures that every transistor experiences both high and low voltage conditions over time, enabling adequate threshold voltage compensation while maintaining simplified control during each individual frame.
2Reliability
If threshold voltage compensation is applied to all pixels, then display quality is improved, but power consumption increases due to continuous high voltage application
Solution Approach 1:
The patent applies threshold voltage compensation selectively rather than continuously to all pixels. In each frame, only selection pixels receive full compensation with all sub-pixels potentially active, while non-selection pixels have one sub-pixel forced to 0 luminance. This partial action approach provides adequate compensation where needed while reducing overall power consumption by limiting high voltage application to only the necessary pixels during necessary frames.
3Illumination intensity
If all sub-pixels are controlled to have non-zero luminance, then display brightness is improved, but it becomes difficult to achieve adequate threshold voltage compensation
Solution Approach 1:
The patent uses periodic frame-based switching where pixels alternate between selection and non-selection states. During selection pixel frames, all sub-pixels can have non-zero luminance for bright display. During non-selection pixel frames, one sub-pixel is forced to 0 luminance to enable threshold voltage compensation. This periodic alternation ensures that adequate compensation is achieved periodically while maintaining overall display brightness through the selection pixel frames.
Data Source
AI summary
A display control device includes: an input part receiving an input signal including gray levels of the first color, the second color and the third color constituting a color for each of the plurality of pixels; a selection part selecting at least one of the plurality of pixels as a selection pixel and other of the plurality of pixels as a non-selection pixel; and an output part outputting an output signal controlling luminances of the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel based on the input signal, wherein at least one of the first sub-pixel, the second sub-pixel and the third sub-pixel of the non-selection pixel is controlled to have a luminance of 0 according to the output signal, and wherein the fourth sub-pixel of the selection pixel is controlled to have a luminance of 0 according to the output signal.