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Technology Behind Toshiba 32C3030D

by Colin Tang
10 April 2007

Backlight

All LCDs should have a backlight control so that you can affect black luminance when proper black level is displayed. In case you didn't know the black level is actually controlled by the [Brightness] control (I didn't invent this misnomer). That means, changing the [Brightness] tells your TV what signal level should be designated as black. It looks like you are increasing image brightness because the higher signal level, the `brighter' black and darker colours will look like. Unfortunately, this causes poorer blacks, lower contrast ratio and inaccurate greyscale. Because LCDs work with constant backlighting, you can improve the quality of black by dimming the backlight after setting the correct black level. Unfortunately excessive dimming can cause overall image brightness to drop too much.

Active Backlight Control

Dynamic backlight control can give lower black luminance for darker scenes. Personally, I tend to leave it off because some flicker can be observed when scene brightness changes dramatically.

MPEG NR

Artifacts from MPEG encoding can be reduced with MPEG NR, which is essentially a high frequency, low magnitude 2D spatial filter. You should refrain from high settings that can remove fine detail from your pictures.

Digital NR

Another noise reduction feature that relies on filtering noise changes between picture frames. The Toshiba may benefit from this as its background digital noise is quite noticeable compared to other sets. You can switch it off if it causes motion smearing during fast action material.

Black Stretch

This feature, on by default, is a bit heavy handed in greyscale `enhancemen' (read distortion). It may improve apparent image contrast but shadow detail is crushed and colours are negatively affected as a result. Off it went.

Colour Temperature

Comes in three flavours, cool, normal and warm. On warm setting, the CCT (correlated colour temperature) graph looked bizarre. This casts a bluish tint on the colours of most signal levels. With no greyscale controls in the user menu, you'll won't be able to fix this.


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