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PDF LM089C-104L Data sheet ( Hoja de datos )
| Número de pieza | LM089C-104L | |
| Descripción | LCD Module | |
| Fabricantes | Landmark | |
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LM089C-104L - Sunlight
Readable 10.4" LCD Module
Landmark Technology 172 Component Drive, San Jose, CA 95131 (408) 434-9302 Fax: (408) 434-0954 12/2002
1 page  
Landmark Technology
LM089C-104L P.5
Operating the VHB Backlight with the Landmark BI200A Inverter
The Lawnwdwm.DaatrakShBeeIt24U0.0coAm is an inverter specially tuned to operate the VHB backlight in all 10.4" and 12.1" sunlight
readable LCD module. The inverter has an on-board
pulse width modulation (PWM) dimming circuit to
provide an extremely wide range of luminance
adjustments. Over the entire dimming range, there is no
noticeable lamp flickering and the uniformity of the
backlight is well maintained.
The BI200A inverter operates at a 12V DC input. The
nominal lamp starting voltage is 1200 Vrms. The
inverter also has a regulated +5V output serving as a
voltage source for the dimming control circuit.
The figure on the right shows the typical LCD screen
luminance as a function of the dimming voltage (Vd)
input. The dimming characteristics are quite linear with
the Vd scale in logarithm. Thus, in order to achieve a
nearly linear luminance control, a logarithmic dimming
voltage generation circuit should be used.
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
depends 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, and as a result, the LCD temperature
rise will be low. However, if the LCD module is mounted horizontally, then almost all of the backlight heat rises to
warm the LCD panel. 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 LM089C-104L module operating at its maximum brightness, the LCD temperature increase due to the VHB
backlight is about 12 to 16 oC. The absorption of direct sunlight, in extreme cases, can heat up the LCD by more than
40 oC! Therefore, it is recommended that the LCD temperature be measured at full display brightness in the installed
equipment under actual operating environments (for example, on a summer day with full sunshine). The cooling
solution should then be designed accordingly. Please make sure that the specified maximum LCD temperature is not
exceeded.
If the thermal issue becomes difficult to resolve, Landmark recommends an “S-mode” operation. By limiting the
backlight luminance to 2/3 of its full level or lower, the power consumption of the backlight is proportionally reduced
and, consequently, the thermal issue is somewhat relaxed. In the meantime, the LCD screen luminance is reduced but
may still be adequate for your application. Please refer to Technical Note TK1205 for further details.
Landmark Technology 172 Component Drive, San Jose, CA 95131 (408) 434-9302 Fax: (408) 434-0954 12/2002
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LM089C-104L.PDF ] | |
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