Display control apparatus

• US 20010026250A1
• Filed: 03/29/2001
• Published: 10/04/2001
• Est. Priority Date: 03/30/2000
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Inoue, Masao, Kawashima, Keiji, Nakaimuki, Masayuki
• Granted Patent: US 6,674,413 B2
• Time in Patent Office: Days
• US Class Current: 345/22
• CPC Class Codes: G09G 1/28 using colour tubes tubes therefor H01J31/20
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H04N 5/44504 Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits
• CPC Class Codes: H04N 9/64 Circuits for processing colour signals H04N9/77 takes precedence; camera processing pipelines for processing colour signals H04N23/84

Abstract

A display control apparatus includes at least one output control unit, and each output control unit comprises: a tri-state buffer receiving, as a signal input, a one-bit color signal, and receiving, as a control input, a one-bit intermediate color control signal for controlling an intermediate color of the color signal, and setting its output in one of the following three states: a state of outputting a first voltage, a state of outputting a second voltage, and a high impedance state, on the basis of the color signal and the intermediate color control signal; a first resistor having an end connected to a power supply, and the other end connected to the output of the tri-state buffer; and a second resistor having an end connected to the ground, and the other end connected to the output of the tri-state buffer. Therefore, it is possible to provide a display control apparatus that is able to perform intermediate color display, with reduced manufacturing cost and reduced power consumption.

Claims

1. A display control apparatus including at least one output control unit, and each output control unit comprising:

a tri-state buffer receiving, as a signal input, a one-bit color signal, and receiving, as a control input, a one-bit intermediate color control signal for controlling an intermediate color of the color signal, and setting its output in one of the following three states;

a state of outputting a first voltage, a state of outputting a second voltage, and a high impedance state, on the basis of the color signal and the intermediate color control signal;

a first resistor having an end connected to a power supply, and the other end connected to the output of the tri-state buffer; and

a second resistor having an end connected to the ground, and the other end connected to the output of the tri-state buffer.

2. The display control apparatus of

claim 1

including, as the output control units, an output control unit to which an R color signal is input, an output signal unit to which a G color signal is input, and an output control unit to which a B color signal is input.

3. The display control apparatus of

claim 1

including a plurality of the output control units, and the respective output control units receive intermediate color control signals which are independent of one another.

4. The display control apparatus of

claim 1

, wherein the output control unit further includes a switch between the power supply and the first resistor, which switch electrically connects the power supply and the first resistor when the color signal and the intermediate color control signal are input to the output control unit, and electrically disconnects the power supply and the first resistor when the color signal and the intermediate color control signal are not input to the output control unit.

5. The display control apparatus of

claim 1

, wherein the output control unit further includes a switch between the ground and the second resistor, which switch electrically connects the ground and the second resistor when the color signal and the intermediate color control signal are input to the output control unit, and electrically disconnects the ground and the second resistor when the color signal and the intermediate color control signal are not input to the output control unit.