Display Device Threshold Voltage Correction Circuit
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Solution Overview
Problem
Display devices using light-emitting elements face challenges in correcting the threshold voltage of driving transistors without increasing the dynamic range of image data, leading to reduced image quality, increased power consumption, and higher fabrication costs.
Innovation Solution
A method for operating a display device that includes a pixel with a transistor, a display element, and a memory circuit, where a correction data generation circuit generates data to correct the threshold voltage of the transistor without altering the image data, allowing for accurate luminance control and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If image data is corrected to correct the threshold voltage of the driving transistor, then the threshold voltage correction is achieved, but the dynamic range of image data must be increased which reduces image quality
Solution Approach 1:
The patent separates threshold voltage correction from image data processing by introducing dedicated correction circuits (gamma correction circuit, offset correction circuit) that operate independently on the image data signal path, allowing correction without affecting image quality
Solution Approach 2:
The patent introduces intermediate correction circuits as mediators between the image data source and the display elements. These circuits (gamma correction circuit 102, offset correction circuit 103) process the image data to correct threshold voltage effects without requiring changes to the original image data dynamic range
2Manufacturing precision
If image data is corrected to correct the threshold voltage of the driving transistor, then the threshold voltage correction is achieved, but the fabrication cost increases due to high withstand voltage requirements
Solution Approach 1:
The patent changes the approach from requiring high withstand voltage in data driver circuits to using correction circuits that operate within standard voltage ranges. By applying gamma correction and offset correction, the system achieves threshold voltage correction without needing high voltage components, reducing fabrication complexity and cost
3Manufacturing precision
If the output potential of the data driver circuit is increased to correct threshold voltage, then the threshold voltage correction is achieved, but the power consumption increases
Solution Approach 1:
The patent introduces correction circuits as intermediaries that handle threshold voltage correction separately from the main data driver output. The gamma correction circuit 102 and offset correction circuit 103 process image data at lower potentials, avoiding the need to increase the output potential of the data driver circuit 101, thus maintaining low power consumption
Data Source
AI summary
A display device that can correct the threshold voltage of a driving transistor without a correction of image data is provided. A display device including a pixel provided with a driving transistor, a display element, and a memory circuit and a correction data generation circuit is related. One of a source and a drain of the driving transistor is electrically connected to one electrode of the display element, and a gate of the driving transistor is electrically connected to the memory circuit. In a first period, the correction data generation circuit generates correction data that is data for correcting the threshold voltage of the driving transistor. In a second period, first data is written to the memory circuit. In a third period, second data is supplied to the pixel, whereby third data in which the second data is added to the first data is generated. In a fourth period, an image corresponding to the third data is displayed by the display element.