Display Grayscale Interpolation via Segmented Voltage Control
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Solution Overview
Problem
Current display technologies face challenges in extending the number of display grayscales while maintaining image quality and reducing costs, as existing methods either increase the cost of output drivers or deteriorate image quality by reducing the number of expressible grayscales.
Innovation Solution
The solution involves performing grayscale control by sequentially selecting electro-optical devices in a display panel and driving them with first and second signal voltages based on an image signal, using grayscale interpolation to express a larger number of grayscales than originally possible, while simplifying the driving circuit configuration and reducing memory storage needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of grayscales of the image signal is increased to increase the number of display grayscales, then the display image quality is improved, but the cost of the output driver increases
Solution Approach 1:
The grayscale control process is segmented into multiple stages: a first signal voltage is applied to select electro-optical devices, then a second signal voltage is applied to control the luminance. This segmentation allows the output driver to use fewer grayscale levels (reducing cost) while still achieving high display grayscale precision through the combined effect of device selection and luminance control.
Solution Approach 2:
The patent introduces a temporal dimension to grayscale control by sequentially applying different signal voltages at different times. Instead of using a single high-resolution grayscale signal, the system uses multiple lower-resolution signals applied in sequence (first voltage for selection, second voltage for luminance), achieving high precision through time-multiplexed control.
2Device complexity
If the number of grayscales of the image signal is reduced to keep the cost of the output driver down, then the cost is reduced, but the number of display grayscales is reduced and the display image quality deteriorates
Solution Approach 1:
The control signal is divided into two separate voltage signals with distinct functions: the first signal voltage selects which electro-optical devices to activate, while the second signal voltage controls the luminance level. This segmentation enables the use of lower-resolution (lower cost) output drivers while maintaining high display quality through the combined control mechanism.
Solution Approach 2:
The first signal voltage acts as an intermediary that selects subsets of electro-optical devices, allowing the second signal voltage to operate at lower resolution. This intermediary selection mechanism enables cost reduction in the output driver without sacrificing overall display grayscale precision.
3Manufacturing precision
If sequential selection and dual voltage driving is implemented to increase display grayscales, then the number of expressible grayscales is increased, but the driving method complexity increases
Solution Approach 1:
The patent employs periodic action by sequentially applying the first signal voltage and then the second signal voltage in repeated cycles. This periodic dual-stage driving approach systematically increases the number of expressible grayscales while maintaining a relatively simple driving circuit through regular, repeating control patterns.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for high-definition grayscale expression with cost reduction, maintaining image quality by increasing the number of expressible grayscales without increasing the number of grayscale controls, thus optimizing both cost and image quality.
Implementation Method 1
a display apparatus having a display device (which is also called an electro-optical device)... in which luminance is changed according to an applied voltage
Data Source
AI summary
A display apparatus includes: a display panel unit in which electro-optical devices that emit display light are arranged in the form of a matrix; and a control unit performing display grayscale control by sequentially selecting the electro-optical devices are arranged and driving the selected electro-optical devices in order with a first signal voltage and a second signal voltage based on an image signal, wherein the control unit divides a grayscale range that can be expressed by the second signal voltage into a plurality of areas and performs a grayscale interpolation operation for interpolating the display grayscales by the electro-optical devices by setting voltage values of the first signal voltage and the second signal voltage according to the grayscales of the image signal as commonly using respective setting information of the first signal voltage for each divided area of the second signal voltage.