DISPLAY DRIVING CIRCUIT

• US 20090295763A1
• Filed: 08/19/2008
• Published: 12/03/2009
• Est. Priority Date: 06/02/2008
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: CHEN, WEN-LIN, GER, CHIH-CHAN
• Granted Patent: US 7,994,738 B2
• Time in Patent Office: Days
• US Class Current: 345/204
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

A display driving circuit includes a temperature compensation adjustment circuit, a control circuit, a full bridge circuit, and a transformation circuit. The temperature compensation adjustment circuit provides a current signal for the control circuit. The value of the current signal changes along with environment temperature changes. The control circuit controls the full bridge circuit based on the current signal. An output voltage signal of the full bridge circuit decreases as the current signal increases, and when the environment temperature decreases. The transformation circuit amplifies the output voltage signal of the full bridge circuit to drive a display.

Claims

1. A display driving circuit for driving a display comprising:

a temperature compensation adjustment circuit for outputting a variable current signal corresponding to environmental temperature changes;

a full bridge circuit;

a control circuit for controlling the full bridge circuit according to the variable current signal, wherein a voltage output from the full bridge circuit decreases as the variable current signal increases, and increases as the variable current signal decreases; and

a transformation circuit for amplifying the voltage output of the full bridge circuit to drive the display.

2. The display driving circuit as claimed in claim 1, the temperature compensation adjustment circuit comprising:

a first resistor;

a second resistor;

an operational amplifier comprising a first terminal connected to the full bridge circuit, a second terminal connected to ground through the second resistor, and a third terminal connected to the second terminal through the first resistor; and

a temperature compensation device comprising two terminals connected to the third terminal and the control circuit, respectively.

3. The display driving circuit as claimed in claim 2, the temperature compensation device is a thermal resistor.

4. The display driving circuit as claimed in claim 2, the first terminal is connected to an input terminal of the full bridge circuit.

5. The display driving circuit as claimed in claim 2, the first terminal is connected to an output terminal of the full bridge circuit.

6. The display driving circuit as claimed in claim 2, the first terminal is connected to the transformation circuit.

7. The display driving circuit as claimed in claim 1, wherein the transformation circuit includes a transformer comprising a primary coil and a secondary coil.