Micro-display Emission Driver Circuit Luminance Compensation
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Solution Overview
Problem
Micro-display devices face luminance deviations due to power line length, which existing methods struggle to effectively compensate for, often requiring time-consuming calculations and incomplete luminance compensation.
Innovation Solution
An emission driver circuit and method that sets different emission times for subpixels based on their distance from the data driver circuit, using a memory to store duty data and a controller to adjust emission signals accordingly, ensuring proper luminance compensation across the micro-display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If data voltages having different weight or luminance compensation values are applied according to data lines, then luminance deviation is reduced, but calculation time increases and luminance compensation may not be properly performed
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing luminance compensation values in a lookup table memory during the manufacturing or initialization phase. During actual display operation, the emission driver circuit simply retrieves pre-computed compensation values based on the specific emission signal line being driven, rather than performing real-time calculations. This eliminates calculation time during operation while maintaining accurate luminance compensation across all emission signal lines.
2Manufacturing precision
If emission times are adjusted according to emission signal lines, then luminance deviations are compensated, but device complexity increases
Solution Approach 1:
The patent merges the emission driver circuit with a lookup table memory structure, combining the emission signal generation function with the luminance compensation function into a single integrated circuit. The emission driver circuit includes a shift register for generating emission signals and a lookup table memory for storing compensation values, both integrated on the same display device. This integration reduces overall device complexity compared to having separate compensation circuits while maintaining the ability to adjust emission times for luminance uniformity.
Data Source
AI summary
A micro-display device comprises a silicon substrate in which a plurality of gate lines, a plurality of data lines, a plurality of emission signal lines, and a plurality of subpixels are disposed; a gate driver circuit disposed on a first side of a pixel array to drive the plurality of gate lines; an emission driver circuit driving the plurality of emission signal lines and disposed on a second side of the pixel array different from the first side of the pixel array where the gate driver circuit is disposed; a data driver circuit disposed on a third side of the pixel array to drive the plurality of data lines; a memory storing duty data regarding duty ratios of an emission signal applied to the plurality of emission signal lines; and a control circuit controlling signals applied to the gate driver circuit, the data driver circuit and the emission driver circuit, wherein the control circuit is set to have different emission times with respect to subpixels connected to the plurality of emission signal lines according to the duty data stored in the memory.