Display Compensation Memory Segmentation for Memory and Power Reduction
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Solution Overview
Problem
As display devices increase in size and resolution, the memory required for storing compensation data to compensate for subpixel characteristic variations increases, leading to higher power consumption and memory size requirements.
Innovation Solution
A display device and driving method that includes a large-capacity memory for initial compensation data, a high-speed memory for sampled data, and a timing controller to process compensation data on a per-frame basis, using predicted and exception data to reduce memory size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the area or resolution of the display device increases, then display performance is enhanced, but the size of the memory for storing compensation data increases
Solution Approach 1:
The patent divides the compensation data storage into two separate memories: a first memory storing initial compensation data and a second memory storing updated compensation data. This segmentation allows the system to maintain comprehensive compensation capabilities while reducing the size requirement of individual memory components, directly resolving the contradiction between display performance and memory size.
Solution Approach 2:
The patent performs preliminary compensation data storage in the first memory before updating with new data from the second memory. This preliminary action ensures that compensation data is always available for display operations, maintaining display performance while enabling efficient memory management that reduces overall memory size requirements.
2Measurement precision
If the area or resolution of the display device increases, then display performance is enhanced, but power consumption increases
Solution Approach 1:
By segmenting compensation data into initial data (first memory) and updated data (second memory), the system reduces the amount of data that needs to be continuously accessed and processed, thereby lowering power consumption while maintaining display performance.
Solution Approach 2:
The patent uses only the necessary compensation data from the second memory for updating, rather than processing all possible data. This partial action approach reduces computational load and power consumption while maintaining sufficient compensation accuracy for display performance.
3Reliability
If internal compensation method is used, then threshold voltage deviation is automatically compensated, but the configuration of the subpixel circuit becomes more complicated
Solution Approach 1:
The patent introduces an intermediary approach by using external compensation data stored in memories rather than implementing complex internal compensation circuits. This intermediary data storage system achieves compensation accuracy while avoiding the increased circuit complexity that would result from internal compensation methods.
Data Source
AI summary
A display device may include a plurality of subpixels respectively connected to a plurality of data lines; a data driving circuit configured to convert a compensated digital image data into an analog data voltage and to supply the analog data voltage to the data lines; a large-capacity memory configured to store initial compensation data based on a characteristic value for each of the plurality of subpixels; a high-speed memory configured to store sampled compensation data sampled from the initial compensation data for less than all of the plurality of subpixels in one frame; and a timing controller configured to control the gate driving circuit and the data driving circuit, to determine final compensation data based on at least one of the sampled compensation data and the initial compensation data, and to output the compensated digital image data based on an input image data and the final compensation data.