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PDF LM073A-DC31 Data sheet ( Hoja de datos )

Número de pieza LM073A-DC31
Descripción LCD Module
Fabricantes Landmark 
Logotipo Landmark Logotipo



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No Preview Available ! LM073A-DC31 Hoja de datos, Descripción, Manual

LM073A-DC31 — Sunlight
Readable 10.4" LCD Module
Landmark Technology 2160 Old Oakland Rd. San Jose, CA 95131 (408) 434-9302 Fax: (408) 434-0954 07/99

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LM073A-DC31 pdf
Landmark Technology
LM073A-DC31 P5
Thermal Management
For normal mode operation at maximum screen brightness, the backlight power consumption is about 19 Watts. As
a result, the LCD temperature will be higher than normal. It is necessary to dissipate the backlight heat such that the
LCD temperature maintains within the Sharp specification for LQ104V1DC31.
The exact amount of screen temperature increase depends on the installation of the LCD module in your equipment.
For example, with LM073A-DC31operating at full brightness in open air with no air flow (still air), the temperature
of the LCD is about 12 to 16 oC above the ambient air temperature depending on whether the LCD is placed vertically
(12 oC) or horizontally (16 oC). When the LCD is mounted onto a heat conducting bezel or a small cooling fan (such
as a CPU fan) is attached to the backlight, the screen temperature rise can be significantly reduced.
It is recommended to measure the LCD screen temperature at full brightness in the equipment under actual operating
environments (for example, in a summer day with full sunshine) and then design the cooling measure accordingly.
Please refer to Sharp LQ104V1DC31 data sheet for the thermal specifications. Make sure that the specified maximum
LCD temperature is not exceeded.
Backlight Life
The half brightness life of the VHB backlight in LM073A-DC31 sunlight readable module is rated at 25,000 hours.
The half brightness life is the number of operating hours before the backlight luminance (so as the LCD luminance)
drops down to 50% of its initial value.
For a well made backlight, its life is mainly determined by the lamp life. Lamp life depends strongly on the lamp
current. The recommended lamp current for full LCD screen brightness is 6 mA. At this level, the half brightness
life of the backlight is rated at 20,000 hours.
In actual applications, a very bright sunlight readable display will most likely be dimmed down during dusk and
night times. For example, if the LM073A-DC31 LCD module is dimmed down to 500 Cd/m2, the lamp current
decreases to about 2 mA and the lamp life increases to well above 100,000 hours. Therefore, the actual operating
lifetime of the VHB backlight in the LM073A-DC31 module is expected to exceed 20,000 hours under most
practical situations. For more detailed descriptions on backlight life issues and actual test data on Landmark
backlights, please refer to Technical Notes 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, and 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 2160 Old Oakland Rd. San Jose, CA 95131 (408) 434-9302 Fax: (408) 434-0954 07/99

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