Abl Circuit; Sb Mode (Super Bright Mode) - NEC MultiSync FE001SB Service Manual

7.5 ABL Circuit

The ABL circuit performs the adjustment of the ABL level with the use of VR302.

The Super Bright Mode (SB MODE hereafter) is a function to achieve the effective display of images by

emphasizing their intonation. This feature is enabled by controlling the brightness level and the contrast.

The SB MODE makes the best use of the features of the high brightness CRT. In this mode, the video

amplitude is increased so that the maximum brightness is raised higher than that in the normal mode.

In the case of this model two kinds of the SB MODE are available, chosen by changing the setting according

to the application.

In the SB MODE1 that is intended to achieve a sharp display of photos or the like, the black level is lowered

than usual to strain the black tone so that the brightness can be raised by increasing the video amplitude.

In the SB MODE2 that is intended to achieve the reproduction of motion pictures like DVD, etc., the black

level is cut off and the maximum brightness is raised higher than that in the SB MODE1. This mode is

effective in attaining the maximum brightness almost equivalent to the brightness of a TV screen, useful for

the expression of details in a dark scene. As a matter of course, the maximum brightness of the SB MODE1

is lower than that of the SB MODE2.

In the SB MODE, U201 is controlled by the microcomputer through the I

time, the video amplitude (maximum brightness) and the image bias point (black level) are controlled.

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C bus to realize this mode. At that

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