LCD Power Consumption Question

[Lawrence San]

I have a Casio watch that has two simultaneous displays: a large,
analog display (with physical hour and minute hands, but no seconds
hand); and a smaller LCD window with a digital display that can be
switched to various modes.

Since I normally keep the LCD in "show today's date" mode, and there's
no seconds hand, there's usually no visible movement. But sometimes I
switch the LCD to the Timer (stopwatch) mode, and then the hundredths
of seconds and seconds flash past in a continuous moving display. I can
keep the timer running in the background while switching back to a
static display (such as the date), but I prefer to keep the timer
visible when it's running.

Here's my question: Is the drain on the watch battery greater when
there's visible movement in the LCD portion of the display? Or does an
LCD displaying a static image consume the same amount of power as that
same LCD when displaying a moving image? (I suppose there might even be
an additional question as to whether the watch's microprocessor
consumes more power when keeping the stopwatch-timer running, in
addition to the regular time function that must always be running.)

Thanks much for any enlightenment.

--
Lawrence San
Cartoon Stories for Thoughtful People:
<http://www.sanstudio.com>
email: san@sanstudio.com

 

[Jerry G.]

On any of the digital watches, when the timer(s) is working, there is a
slight increase of power consumption. The increase is more due to the
additional activity, than the LCD display itself. Depending on the model,
the power consumption increase can be a number of micro-amps. This will make
some difference in the battery life, but over a very long period.

Considering that a battery is not very expensive, you should enjoy the watch
and not worry about it.

--

Jerry G.
=====


"Lawrence San" <san@sanstudio.com> wrote in message
news:190520041805499083%san@sanstudio.com...
I have a Casio watch that has two simultaneous displays: a large,
analog display (with physical hour and minute hands, but no seconds
hand); and a smaller LCD window with a digital display that can be
switched to various modes.

Since I normally keep the LCD in "show today's date" mode, and there's
no seconds hand, there's usually no visible movement. But sometimes I
switch the LCD to the Timer (stopwatch) mode, and then the hundredths
of seconds and seconds flash past in a continuous moving display. I can
keep the timer running in the background while switching back to a
static display (such as the date), but I prefer to keep the timer
visible when it's running.

Here's my question: Is the drain on the watch battery greater when
there's visible movement in the LCD portion of the display? Or does an
LCD displaying a static image consume the same amount of power as that
same LCD when displaying a moving image? (I suppose there might even be
an additional question as to whether the watch's microprocessor
consumes more power when keeping the stopwatch-timer running, in
addition to the regular time function that must always be running.)

Thanks much for any enlightenment.

--
Lawrence San
Cartoon Stories for Thoughtful People:
<http://www.sanstudio.com>
email: san@sanstudio.com