Three-tube type projection device and method for adjusting convergence thereof

Abstract

The present invention provides a three-tube type projection device and method for adjusting convergence thereof. Point data, representing the convergence correction quantities of respective colors R, G, and B as to a plurality of adjustment points virtually arrayed as representative points on the screen (19), in advance, are stored to a memory (31), convergence correction data on pixels existing between adjustment points are calculated by an interpolative arithmetic section 35, based on the point data corresponding to the adjustment points to generate auxiliary deflection signals of R, G, and B based upon the respective convergence correction data, and the signals are sent to projection tubes (181, 182, and 183) of the corresponding colors to correct convergence on the screen (19). When adjustment mode of convergence is selected, a color and an adjustment point are designated, and a correction value that the point data indicate has increased or decreased, in adjustment steps predetermined corresponding to the position of the adjustment point to adjust a correction quantity for the convergence is adjusted.

Description

technical field [0001] The invention relates to a three-pipe projection device with convergence adjustment function. Background technique [0002] As is well known, in a rear-projection type three-tube projection device, red, green, and blue videos (hereinafter abbreviated as R, G, and B) are projected onto the screen from three projection tubes with respective colors arranged in sequence. to obtain color video. The R and B projection tubes are arranged at a predetermined angle with respect to the G projection tube. Therefore, color misregistration occurs on the screen. To solve this problem, generally, color matching is performed by electromagnetic correction of each projection tube. A converging device is a device for performing color matching by supplementary electromagnetic correction. [0003] For example, Japanese Patent Application Laid-Open Publication No. 7-212779 "Digital Convergence Device" discloses a detailed configuration of the convergence device. In the ...

AI Technical Summary

Problems solved by technology

[0005] However, in the manually operated convergence adjustment unit of the conventional projection device, the correction data change amount for each step of convergence correction is consistent regardless of the position and color of the screen

On the left and right sides of the screen, the correction sensitivity of R and B convergence is different

Therefore, the correction accuracy of one color will be poor because the correction sensitivity is too high, and the convergence correction process of the other color will be time-consuming because the correction sensitivity is too low, thus creating a problem

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