Invention Grant
- Patent Title: Controlling pixel brightness in a field emission display using circuits for sampling and discharging
- Patent Title (中): 使用采样和放电电路控制场发射显示器中的像素亮度
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Application No.: US09189085Application Date: 1998-11-09
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Publication No.: US06380913B1Publication Date: 2002-04-30
- Inventor: Glen E. Hush , Tyler A. Lowrey
- Applicant: Glen E. Hush , Tyler A. Lowrey
- Main IPC: G09G322
- IPC: G09G322

Abstract:
A flat panel display, such as a Field Emission Display (“FED”), is disclosed having a current control circuit. Input into the display, initially, is an analog signal having an amplitude. In one embodiment, the current control circuit includes a converter for converting the analog input signal to a sawtooth signal having a height and width. Then, the level of the sawtooth signal is compared to a voltage level to establish a pulse width of an emitter current. The emitter current is thus controlled by a pulse width modulation approach. In another embodiment, the current control circuit traps a column voltage on a parasitic capacitance. The trapped voltage then controls the gate of a transistor to control current flow from the emitter set to ground.
Information query