Display Driver IC Pixel Deterioration Compensation
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Solution Overview
Problem
Display devices, particularly OLEDs, face deterioration issues due to usage time, heat cycles, and mechanical stress, leading to image sticking and ghosting phenomena, which existing technologies have not adequately addressed in terms of efficient compensation.
Innovation Solution
A display driver integrated circuit is designed with a memory for storing compensation data, a compensator to generate output image data, and an accumulator that groups pixels into blocks to generate block and pixel accumulation data, allowing for efficient compensation of pixel deterioration by storing data in internal and external memories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel deterioration compensation is implemented using existing technologies, then image quality can be improved, but power consumption and chip size increase due to additional sensing circuits and complex compensation mechanisms
Solution Approach 1:
The display driver integrated circuit performs self-diagnosis by monitoring its own internal node voltages and currents to detect pixel deterioration. The compensation values are generated and stored within the same IC without requiring external sensing circuits, enabling the system to serve its own diagnostic and compensation needs.
Solution Approach 2:
The patent extracts only the essential compensation functionality from complex sensing circuits by directly monitoring critical nodes (such as ELVDD voltage changes) within the existing driver IC architecture. This extraction approach eliminates the need for separate sensing circuits while maintaining compensation capability.
2Reliability
If pixel deterioration compensation is implemented using existing technologies, then image quality can be improved, but power consumption increases due to continuous monitoring and complex compensation operations
Solution Approach 1:
The compensation process is executed periodically at specific timing points (such as during blanking intervals or at predetermined frames) rather than continuously. The display driver IC monitors voltage changes and generates compensation values at these periodic intervals, reducing overall power consumption while maintaining effective compensation.
Solution Approach 2:
The system uses existing operational data and internal voltage monitoring during normal display operation to generate compensation values, rather than requiring separate power-intensive sensing operations. The same circuitry used for driving the display also performs the diagnostic function.
3Measurement precision
If comprehensive pixel monitoring is performed to detect deterioration, then compensation accuracy can be improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts compensation information from critical voltage nodes already present in the display driver IC architecture, such as ELVDD voltage changes that naturally occur during operation. By monitoring these existing nodes, the system achieves accurate deterioration detection without adding separate sensing circuits.
Solution Approach 2:
The display driver IC's existing circuitry serves multiple functions: it both drives the display pixels and simultaneously monitors voltage changes for deterioration detection. The same power supply lines and control circuits used for pixel operation are also used for diagnostic purposes, eliminating the need for dedicated sensing hardware.
Data Source
AI summary
A display driver integrated circuit includes a first memory, a compensator, an accumulator and a second memory. The first memory stores a plurality of compensation data that are used to compensate for deterioration of a plurality of pixels. The compensator generates a plurality of output image data for image display by compensating a plurality of input image data based on the plurality of compensation data. The accumulator groups the plurality of pixels into a plurality of blocks, generates a plurality of block image data by sampling the plurality of output image data in block units, generates a plurality of block accumulation data in block units based on the plurality of block image data, and generates a plurality of pixel accumulation data in pixel units by synthesizing portions of the plurality of output image data and portions of the plurality of block accumulation data. The second memory stores the plurality of block accumulation data in a first period. The plurality of pixel accumulation data may be stored in a third memory in a second period longer than the first period.