Display Driver Command Signal Filtering via Sampling Logic

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Display drivers face challenges in maintaining display quality due to signal interference, which affects the accuracy of command signals sent to display panels, leading to abnormal image display.

Innovation Solution

A method and device that involve a sampling circuit and logic circuit to record and analyze command values over time, determining a 'most-probably correct' command value to generate a filtered signal for driving pixel circuits, thereby reducing signal interference and ensuring accurate image display.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If command signals are transmitted directly without filtering, then signal transmission speed is maintained, but signal accuracy deteriorates due to interference

Engineering Contradiction:
Improvecommand signal accuracyVSAvoidsignal processing time
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by recording multiple command values in advance before determining the final correct value. The sampling circuit captures N command values (N≥2) from the command signal, storing them temporarily in a shift register before the logic circuit processes them to identify the most probable correct value through majority voting or comparison logic.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by using the recorded command values to verify and correct the current command signal. The logic circuit compares the N recorded command values, identifies the most frequent or most probable correct value, and uses this feedback to generate a corrected command signal that compensates for interference or errors in the original signal.

Inventive Principle:
Principle #23Feedback

2Reliability

If multiple command values are recorded and analyzed, then signal accuracy is improved, but device complexity increases

Engineering Contradiction:
Improvedisplay qualityVSAvoidcircuit structure
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the command signal processing into distinct functional modules: a sampling circuit that records N command values, a shift register that stores these values, and a logic circuit that analyzes them. This modular segmentation allows each component to perform a specific function, making the overall system more manageable and easier to implement with standard digital circuit elements.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent uses copying by creating N copies of the command signal values and storing them in the shift register. Instead of complex real-time analysis, the system makes multiple copies of the command values at different sampling points, then compares these copies to identify the correct value. This copying approach simplifies the logic circuit design, as it only needs to compare pre-captured values rather than perform complex real-time computations.

Inventive Principle:
Principle #26Copying

Data Source

PatentUS11244641B2Method, device and display driver having a filtered command signal
Publication Date: 2022.02.08 NOVATEK MICROELECTRONICS CORP
  • US11244641B2 patent drawing
  • US11244641B2 patent drawing
  • US11244641B2 patent drawing

AI summary

A device is applicable to a display driver, including a sampling circuit and a logic circuit. The sampling circuit is configured to sample a command signal by recording a plurality of command values of the command signal at different times. The plurality of command values corresponds to at least one data line of a pixel circuit. The logic circuit is electrically coupled to the sampling circuit, and is configured to receive the plurality of command values. The logic circuit is further configured to generate a filtered command signal according to the plurality of command values, and is configured to provide the filtered command signal to drive the pixel circuit.