Display Device Noise Compensation Circuit EMI Reduction
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Solution Overview
Problem
Display devices face performance defects due to electromagnetic interference (EMI), which degrade system stability and affect touch sensing and display performance.
Innovation Solution
A display device with a noise compensator circuit that senses noise signals from various parts using different sensing lines and applies different gain values to generate noise compensation signals, adjusting the common voltage to reduce electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensing lines are added to detect noise from different parts, then noise detection capability is improved, but device complexity increases
Solution Approach 1:
The display device is divided into multiple sensing regions, each with its own sensing line connected to the noise compensator circuit. This segmentation allows independent noise detection from different parts (display panel, gate driver, source driving integrated circuit) while maintaining a modular structure that manages complexity through functional distribution.
Solution Approach 2:
The noise compensator circuit serves multiple functions: it receives sensing signals from multiple sensing lines, generates inverted sensing signals with different gain values, creates noise compensation signals, and adjusts the common voltage. This multi-functionality consolidates several operations into a single circuit, improving noise detection capability without proportionally increasing device complexity.
2Reliability
If different gain values are applied to inverted sensing signals, then noise compensation effectiveness is improved, but circuit complexity increases
Solution Approach 1:
The noise compensator circuit dynamically adjusts gain values for different sensing signals based on the specific noise characteristics detected from each part. By making the gain adjustment dynamic rather than fixed, the circuit can effectively compensate for noise while adapting to varying operating conditions, improving reliability without requiring complex manual configuration.
Solution Approach 2:
The circuit changes the gain parameter of the sensing signals to optimize noise compensation. By applying different gain values to inverted sensing signals from different parts, the circuit effectively compensates for noise while managing complexity through automated parameter adjustment rather than complex circuit architecture.
3Object-affected harmful factors
If common voltage is adjusted based on noise compensation signal, then electromagnetic interference is reduced, but control complexity increases
Solution Approach 1:
The noise compensator circuit establishes a feedback loop where sensing signals from the display device parts are continuously monitored, inverted, processed with appropriate gain values, and used to generate noise compensation signals that adjust the common voltage. This feedback mechanism automatically reduces electromagnetic interference while managing control complexity through closed-loop operation.
Solution Approach 2:
The system performs self-diagnosis and self-correction by using its own sensing lines to detect noise and then automatically adjusting the common voltage through the noise compensator circuit. This self-service approach reduces electromagnetic interference without requiring external intervention or complex control systems, as the device monitors and corrects its own performance.
Data Source
AI summary
A display device may include a display panel including pixels and at least one common electrode overlapping a portion of the pixels in an active area of the display panel; a gate driver configured to supply a gate signal to the pixels; a source driving integrated circuit configured to supply a data signal to the pixels and configured to supply a common voltage to the common electrode; and a noise compensator circuit configured to receive a plurality of sensing signals from a plurality of sensing lines that are connected to at least one of the display panel, the gate driver, or the source driving integrated circuit, generate a plurality of inverted sensing signals by applying different gain values to signals obtained by inverting phases of each of the plurality of sensing signals, and generate a noise compensation signal based on at least one of the plurality of inverted sensing signals.