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PDF LM130A-12C318 Data sheet ( Hoja de datos )
| Número de pieza | LM130A-12C318 | |
| Descripción | Sunlight Readable 12.1 LCD Module | |
| Fabricantes | LandMark | |
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LM130A-12C318 - Sunlight
Readable 12.1" LCD Module
Landmark Technology 172 Component Drive, San Jose, CA 95131 (408) 434-9302 Fax: (408) 434-0954 08/2002
1 page  
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Landmark Technology
LM130A-12C318 P.5
Thermal Management
The VHB backlight consumes a significant amount of power and as a result, the LCD temperature of a sunlight readable
module will be higher than normal. In addition, the front surface of an LCD is a good sunlight absorber. Placing an
LCD under strong direct sunlight can cause a significant temperature rise even without the backlight power.
The exact amount of temperature rise due to these two factors depends on how the LCD module is mounted and also
on the heat dissipation design. For example, if the LCD is mounted vertically, a significant portion of the VHB backight
heat will be dissipated into the air without heating up the LCD panel. As a result, the LCD temperature rise will be
low. On the other hand, if the LCD module is mounted horizontally, then almost all of the backlight heat rises to warm
the LCD panel. However, if a small fan or a heat sink is mounted onto the VHB backlight, the temperature rise of the
LCD panel can be reduced significantly. With the LM130A-12C318 module operating at its maximum brightness, the
LCD temperature increase due to the VHB backlight is about 10 to 15 oC. On the other hand, the absorption of direct
sunlight by the LCD can heat up the LCD by more than 40 oC in the extreme cases! Combining both heating effects,
the LCD temperature may increase by more than 55oC! Therefore, some forced cooling solution is needed to keep the
LCD temperature within the specified range.
It is recommended that the LCD temperature be measured at full display brightness in your equipment under actual
operating environments (for example, on a summer day with full sunshine). The cooling solution should then be
designed accordingly. Please refer to the Toshiba LTM12C318 data sheet for LCD thermal specifications. Make sure
that the specified maximum LCD temperature is not exceeded.
Backlight Life
The backlight life is usually specified in half brightness life, which is the cummulative number of operating hours
before the backlight luminance drops down to 50% of its initial value. The VHB backlight in the LM130A-12C318
sunlight readable LCD module is rated at 25,000 hours when it is operated at maximum brightness. The backlight
life is mainly determined by the lamp life. Lamp life depends strongly on the lamp current. If the lamps are operated
at a reduced current, then the half brightness life of the VHB backlight can be extended far beyond the specified
25,000 hours.
In actual applications, a very bright sunlight readable display will most likely be dimmed down during dusk and at
night. For example, if the screen brightness of the LCD module is dimmed down to 2/3 of its full level, the lamp
current decreases to about 4 mA and the lamp life increases to about 40,000 hours. Therefore, the actual operating
lifetime of the VHB backlight in the LCD module is expected to exceed 25,000 hours under most practical situations.
For more detailed information on backlight life issues and actual test data on Landmark backlights, please refer to
Technical Note TK801.
Disclaimer
Landmark Technology Inc. reserves the right to make changes to this document and the product which it describes without notice. In
addition, Landmark Technology Inc. shall not be liable for technical or editorial errors or omissions made herein; nor for incidental or
consequential damages resulting from the furnishing, performance, or use of this product.
This product shall not be used for or in connection with equipment that requires an extremely high level of reliability, such as military
and aerospace applications, telecommunication equipment, nuclear power control equipment and medical or other life support
equipment. Landmark Technology Inc. takes no responsibility for damage caused by improper use of this product which does not
meet the conditions for use specified in this specification sheet.
Landmark Technology 172 Component Drive, San Jose, CA 95131 (408) 434-9302 Fax: (408) 434-0954 08/2002
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| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet LM130A-12C318.PDF ] | |
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