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A method for adjusting the timing of TV line and field signals

A line field signal and timing adjustment technology, which is applied to TV, color TV, color TV parts, etc., can solve the problems of OSD flickering, poor visual sense, etc., and achieve the effect of ensuring stable output and improving visual sense

Active Publication Date: 2017-07-07
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple to implement, but because the line and field signals of the OSD (on-screen display) menu come from the line and field signal timing adjustment circuit, an OSD (on-screen display) will be generated when switching signal sources of different formats or switching between signals. Menu flickering phenomenon, poor visual sense

Method used

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  • A method for adjusting the timing of TV line and field signals

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Embodiment 1

[0019] Embodiment one: see figure 1 As shown, a method for adjusting the timing of TV line and field signals, comprising the following steps:

[0020] Step 1. Configure initial parameters. In the initial state, configure the following parameters according to the screen used: continuous stable external input field number N, effective point number THV (screen width) of a line, line period THP, line sync signal width TWH, line front shoulder width TFPH, effective line number of a field TVV (screen height), field period TVP, field sync signal width TWV, field back shoulder width TFPV, maximum field period TVP_MAX allowed by the screen, minimum field period TVP_MIN allowed by the screen, maximum row period THP_MAX allowed by the screen, minimum allowed by the screen The line cycle THP_MIN, the red component RED of the internal output image, the green component GREEN of the internal output image, and the blue component BLUE of the internal output image. According to the pre-config...

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Abstract

The invention discloses a method for adjusting the time series of TV line and field signals, which comprises the following steps: 1. Configure initial parameters, and output stable internal line synchronous signals, internal field synchronous signals, internal data effective signals and internal image data according to the configured initial parameters signal, and detect whether there is a stable external video input signal at the same time, if a stable external video input signal is detected, execute step 2 when the rising edge of the internal field sync signal comes; otherwise, repeat step 1 when the rising edge of the internal field sync signal comes ; 2. Line cycle synchronization; 3. Field cycle synchronization; 4. Synchronization locking process. The present invention does not perform line and field signal switching, and gradually adjusts the internal line and field signal after detecting a stable external video input to make it synchronized with the external line and field signal, and switches the data to external video input data to realize the line and field signal of the TV. stable output.

Description

technical field [0001] The invention relates to the technical field of video monitoring, in particular to a method for adjusting the time series of TV line and field signals, so as to eliminate the flickering phenomenon in the switching state of the signal source. Background technique [0002] At present, many TV chips do not use the frame buffer architecture in order to save costs, which increases the difficulty of designing the TV field signal adjustment circuit. The traditional implementation method is to output the line and field signals generated inside the chip when there is no signal, and then switch to the external input line and field signals when a signal input is detected. This method is simple to implement, but since the line and field signals of the OSD (on-screen display) menu come from the line and field signal timing adjustment circuit, an OSD (on-screen display) will be generated when switching signal sources of different formats or switching between signals...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/04
Inventor 汤岐
Owner CRM ICBG (WUXI) CO LTD