Picture Mode Controller for Flat Panel Display Timing Signal Integrity
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Solution Overview
Problem
Flat panel displays often display abnormal images due to missing or distorted timing signals during initial booting or resolution changes, leading to reduced reliability and accuracy in image representation.
Innovation Solution
A picture mode controller that generates pseudo timing signals to selectively output either video or black images based on the presence of timing signals and their periodic changes, ensuring accurate image display even when original timing signals are absent or distorted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timing signals are transmitted from video source to flat panel display device, then video data can be received, but timing signals can be interfered and distorted by noises leading to abnormal images
Solution Approach 1:
The patent introduces a picture mode controller as an intermediary component between the video source and flat panel display device. This controller detects the presence and validity of timing signals (data enable signal and data clock) and selectively switches between receiving video data based on timing signals or generating a black image, thereby mediating the harmful effect of noise-distorted timing signals
Solution Approach 2:
The patent implements a feedback mechanism where the picture mode controller continuously monitors the timing signals from the video source, detects their presence or distortion, and adjusts the display mode accordingly. The controller uses the timing signals themselves as feedback to determine whether to display video content or a black image, creating a closed-loop system that responds to signal quality
2Reliability
If a black image is displayed when data enable signal is absent, then abnormal images are prevented, but an abnormal image is still displayed when resolution mode changes due to temporary abnormal timing signals
Solution Approach 1:
The patent applies dynamics by making the display mode adaptive and changeable based on real-time detection of timing signal characteristics. The picture mode controller dynamically switches between video display mode and black image mode depending on whether timing signals are present and valid, allowing the system to adapt to different operational states including initial booting and resolution mode changes
Solution Approach 2:
The patent implements preliminary action by having the picture mode controller detect the presence of timing signals before attempting to display video data. The controller proactively checks for the data enable signal and data clock, and only proceeds with video display when these signals are confirmed to be present and valid, preventing abnormal images before they occur
3Reliability
If timing signals are monitored to detect their presence, then abnormal images can be prevented, but device complexity increases due to additional control circuits
Solution Approach 1:
The patent applies universality by designing the picture mode controller to perform multiple functions: detecting the presence of data enable signals, detecting the presence of data clock signals, determining whether timing signals are valid, and selectively switching between video display and black image display. This multi-functional approach consolidates what could be multiple separate circuits into a single integrated controller, managing complexity
Data Source
AI summary
The picture mode controller for flat panel and flat panel display device including the same includes an input unit to input a first timing signal indicating transmission sections for pixel data, and a second timing signal indicating a transmission time of each pixel data, a pseudo timing signal generating unit to generate a first pseudo timing signal to be used as the first timing signal, a first selecting unit to selectively output the first timing signal and the first pseudo timing signal to allow one of a video picture mode and a black picture mode to be designated, and a selection control unit to control a selecting operation of the first selecting unit based on whether the first timing signal is input from the input unit and whether a period of the second timing signal changes.