Display Driving Device Sense Circuit Offset Compensation
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Solution Overview
Problem
Conventional display driving devices face challenges in accurately detecting pixel characteristics due to offset differences between source and sense amplifiers, leading to increased circuit complexity and incomplete compensation for amplifier offsets.
Innovation Solution
A display driving device with a sense circuit that includes sense amplifiers providing a first reference voltage for programming and a second reference voltage for sensing, operating in distinct modes to accurately detect pixel signals and compensate for amplifier offsets without the need for auto-zeroing or timing circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If source amplifier and sense amplifier are used to detect pixel signals, then pixel characteristics can be detected, but detection accuracy deteriorates due to different offsets between amplifiers
Solution Approach 1:
The patent applies preliminary action by initializing both the source amplifier and sense amplifier to the same reference voltage level before pixel signal detection. This preliminary initialization ensures that both amplifiers start from an identical baseline, eliminating offset differences that would otherwise degrade detection accuracy. The controller sets both amplifiers to a predetermined voltage level prior to the detection process.
2Reliability
If auto-zeroing circuit and timing circuit are added to compensate for amplifier offset, then offset compensation is achieved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for complex auto-zeroing circuits and timing circuits by using a simpler initialization approach. Instead of incorporating additional compensation circuits, the invention removes the requirement for these complex elements by initializing both amplifiers to the same reference voltage, thereby achieving offset compensation without increasing device complexity.
Solution Approach 2:
The amplifiers perform self-service by being initialized to a common reference voltage level through the controller's control signals. This self-initialization process allows the amplifiers to automatically establish a consistent baseline without requiring external auto-zeroing circuits or complex timing control mechanisms.
3Reliability
If additional circuit is used to compensate for amplifier offset, then offset compensation is attempted, but detection accuracy remains insufficient because offset is not perfectly removed
Solution Approach 1:
The patent achieves perfect offset removal through preliminary action by initializing both the source amplifier and sense amplifier to the exact same reference voltage level before detection. This preliminary initialization ensures that no offset difference exists between the amplifiers, enabling accurate pixel characteristic detection without requiring complex additional compensation circuits.
Data Source
AI summary
Provided are a display driving device capable of accurately detecting characteristics of pixels of a display panel regardless of an offset of an amplifier, and a display device including the same. The display device includes a display panel including pixels and a display driving device including a sense circuit configured to detect pixel signals from the pixels. The sense circuit includes sense amplifiers configured to provide the first reference voltage to the pixels so that the pixels are programmed using a first reference voltage in a programming mode.