Computer system including protected graphics display control sig

Details Computer system including protected graphics display control sig Computer system including protected graphics display control sig

1995-06-08

1997-12-30

Powell, Mark R.

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

345211, 395750, 395559, G06F 1310

Patent

active

057036292

ABSTRACT:
A computer system is provided which assures that display control signals provided to a display are properly sequenced despite the presence of ill-behaved application software. The risk of damage to displays which require control signals to be in a predetermined sequence is thus significantly reduced. An enable signal from the system's graphics controller is intercepted by a microcontroller. The microcontroller generate its own properly sequenced and timed display control signals in response to the enable signal from the graphics controller. The microcontroller controls a switching apparatus which couples clock and data signals from the graphics controller to the display at an appropriate time in the control signal sequence.

REFERENCES:
patent: 5167024 (1992-11-01), Smith et al.
patent: 5325287 (1994-06-01), Spahr et al.
patent: 5375209 (1994-12-01), Maher et al.
patent: 5389952 (1995-02-01), Kikinis
Guthrie, "Power on Sequencing for LCD Displays: When, Why, and How", Sharp Corp., Apr. 1972.

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