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4.3.2 Watchdog Reset Circuits

Integrated watchdog monitoring circuits will automatically restart the OCS in the event of a software or hardware

fault.

4.3.3 Thermal Management

Independent temperature control electronics continuously monitor the temperature of the microprocessor and the

LCD module. If the temperature falls below the safe operating threshold, internal heaters are activated to keep the

LCD and control electronics warm. This will insure consistent operation over the entire operating temperature

range. If the temperature exceeds safe operating limits, several steps are taken to reduce heat while maintaining

operation. If the processor temperature is exceeding safe operating limits, the temperature control electronics reduce

the processor operating frequency, thus reducing the dissipated heat. If the temperature of the LCD is exceeding

recommended operating conditions, the backlight brightness is reduced to minimize dissipated heat. If these

measures are not sufficient to maintain internal temperature within safe limits, the system is shut down to protect the

electronics and LCD module until the system has returned to a safe operating temperature.

4.4 Sunlight Readable Display Technology

All displays are the most advanced Active Matrix TFT (AM/TFT) color LCD technology available in the industry.

The color LCD’s utilized in Delphi’s products exhibit similar performance characteristics across all sizes. Delphi

adds custom hi-bright backlights and optical filters to maximize readability in direct sunlight. Additional filters are

incorporated into the protective front glass to protect the LCD color filters from the prolonged effects of exposure to

UV light and heat caused by infrared light. The following table outlines the specifications of the supported LCD

panels.

Display Size Resolution Luminance Viewing Angle Contrast Ratio

15.0” Diagonal

(9.0”H x

12.0”W)

1024 x 768

pixels

(0.30 mm

pixel pitch)

1500 Cd/m

(Nits)

60° (±30°) at > 100:1

contrast ratio

450:1 (±18° Viewing

Angle), 100:1 (±30°

Viewing Angle)

Figure 11 - Supported LCD Sizes and Specifications

4.4.1 Continuous LCD Brightness Control

Optimal readability in all lighting conditions is achieved through active control of LCD brightness levels. Outside

ambient light levels are continuously monitored by the OCS controller electronics. The LCD brightness levels are

constantly adjusted to the optimum contrast for the given ambient light levels. At nighttime, the LCD brightness is

reduced to extend bulb life. The system may be configured to automatically shut off the backlight during periods of

in-operation, further extending bulb life and reducing energy consumption.

4.5 Vandalism Protection

The OCS is designed to be resistant to vandalism. Displays utilize tempered safety glass to protect the LCD surface.

The glass is impervious to most chemicals and can be cleaned with solvents to remove stickers, paint and other

materials. Optional field replaceable vandal shields are supplied to further protect the display from acts of

vandalism. If the vandal shield becomes scratched or damaged, it can be replaced in the field in less than five

minutes.

4.6 System Extensibility

The OCS has been designed to be extensible to allow future hardware upgrades with minimal cost impact.

4.6.1 Flexible Memory Configurations

The OCS memory can be easily tailored to the requirements of the application program. Both SDRAM and FLASH

memory are upgradeable.

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