PRESS-BUTTON CIRCUIT AND DRIVING METHOD THEREOF, KEYPAD, AND DISPLAY DEVICE

• US 20180262208A1
• Filed: 05/05/2017
• Published: 09/13/2018
• Est. Priority Date: 05/06/2016
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., K-Tronics (Suzhou) Technology Co., Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., K-Tronics (Suzhou) Technology Co., Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: CAO, Yongming
• Granted Patent: US 10,447,299 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 3/023 Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
• CPC Class Codes: H03M 11/02 Details
• CPC Class Codes: H03M 11/24 using analogue means , e.g. by coding the states of multiple switches into a single multi-level analogue signal or by indicating the type of a device using the voltage level at a specific tap of a resistive divider

Abstract

Press-button circuit and a driving method thereof are provided. A press-button circuit includes a first sampling port; a second sampling port; a common terminal; a first control device, coupled to the first sampling port and the second sampling port; at least one first press-button sub-circuit, coupled to the first sampling port and the common terminal; and at least one second press-button sub-circuit, coupled to the second sampling port and the common terminal.

Claims

1. A press-button circuit, comprising:

a first sampling port;

a second sampling port;

a common terminal;

a first control device, coupled to the first sampling port and the second sampling port;

at least one first press-button sub-circuit, coupled to the first sampling port and the common terminal; and

at least one second press-button sub-circuit, coupled to the second sampling port and the common terminal.

2. The press-button circuit according to claim 1, further comprising:

a first node, coupled to the first sampling port via the first control device, and coupled to the second sampling port via a second control device, and

at least one third press-button sub-circuit, coupled to the first node and the common terminal,

wherein;

the first control device is configured to control a connection between the first node and the first sampling port, and

the second control device is configured to control a connection between the first node and the second sampling port.

3. The press-button circuit according to claim 2, wherein:

the at least one first press-button sub-circuit, the at least one second press-button sub-circuit, and the at least one third press-button sub-circuit are arranged in parallel with one another.

4. The press-button circuit according to claim 2, wherein:

each of the at least one first press-button sub-circuit, the at least one second press-button sub-circuit, and the at least one third press-button sub-circuit includes a voltage divider.

5. The press-button circuit according to claim 4, wherein:

each of voltage dividers of any two of all of the at least one first press-button sub-circuit and the at least one third press-button sub-circuit includes a fixed-value resistor having a different resistance.

6. The press-button circuit according to claim 4, wherein:

each of voltage dividers of any two of all of the at least one second press-button sub-circuit and the at least one third press-button sub-circuit includes a fixed-value resistor having a different resistance.

7. The press-button circuit according to claim 2, wherein:

the at least one first press-button sub-circuit includes a number of three first press-button sub-circuits, coupled to the first sampling port and the common terminal,

the at least one second press-button sub-circuit includes a number of three second press-button sub-circuits, coupled to the second sampling port and the common terminal, and

the at least one third press-button sub-circuit includes one third press-button sub-circuit, coupled to the first node and the common terminal.

8. The press-button circuit according to claim 2, further comprising:

a third sampling port,

a third control device,

a fourth control device,

a second node, coupled to the third sampling port via the third control device, and coupled to at least the first sampling port via the fourth control device, wherein the second node is further coupled to the second sampling port via the first and second control devices, and

at least one fourth press-button sub-circuit, coupled to the second node and the common terminal,

wherein;

the third control device is configured to control a connection between the second node and the third sampling port, and

the fourth control device is configured to control a connection between the second node and, the first and second sampling ports.

9. The press-button circuit according to claim 2, wherein:

each of the at least one first press-button sub-circuit, the at least one second press-button sub-circuit, and the at least one third press-button sub-circuit includes a key configured in series with a fixed-value resistor.

10. The press-button circuit according to claim 1, wherein:

each of the first and second control devices includes one of a variable resistor, a switch, a transistor, and a potentiometer.

11. The press-button circuit according to claim 1, wherein the common terminal is connected to ground.

12. A display device, comprising:

a keypad, comprising the press-button circuit according to claim 1.

13. The display device according to claim 12, wherein the keypad includes:

a motherboard controller, including;

a first general purpose input output (GPIO) port, coupled to the first sampling port, and

a second general purpose input output (GPIO) port, coupled to the second sampling port,

wherein;

the motherboard controller is configured to provide a voltage to the common terminal.

14. A method for driving a press-button circuit, comprising:

providing the press-button circuit, including;

a node, coupled to a first sampling port via a first control device, and coupled to a second sampling port via the second control device;

a number of (m) first press-button sub-circuits, coupled to the first sampling port and the common terminal;

a number of (n) second press-button sub-circuits, coupled to the second sampling port and the common terminal; and

a number of (i) third press-button sub-circuits, coupled to the node and the common terminal, wherein m, n, and i are integers of 1 or greater;

controlling the first and second control devices, such that the first, second, and third press-button sub-circuits form a sampling port through a circuit arrangement including (m+n+i) press-button sub-circuits;

controlling the first and second control devices, such that the first sampling port uses a circuit arrangement including (m+n) press-button sub-circuits, and the second sampling port uses a circuit arrangement including (i) press-button sub-circuits; and

controlling the first and second control devices, such that the first sampling port uses a circuit arrangement including (m) press-button sub-circuits, and the second sampling port uses a circuit arrangement including (n+i) press-button sub-circuits.

15. The method according to claim 14, wherein:

each of the number of (m) first press-button sub-circuits, the number of (n) second press-button sub-circuits, and the number of (i) third press-button sub-circuits includes a voltage divider.

16. The method according to claim 14, wherein:

each of the first and second control devices is one of a variable resistor, a switch, a transistor, and a potentiometer.

17. The method according to claim 14, wherein controlling the first and second control devices includes:

switching on the first and second control devices to provide the circuit arrangement including the (m+n+i) press-button sub-circuits,

switching on the first control device and switching off the second control device to provide the circuit arrangement including the (m+n) press-button sub-circuits for the first sampling port and to provide the circuit arrangement including the (i) press-button sub-circuits, and

switching off the first control device and switching on the second control device to provide the circuit arrangement including the (m) press-button sub-circuits and to provide the circuit arrangement including the (n+i) press-button sub-circuits.

18. The method according to claim 14, wherein:

each of voltage dividers of any two of all of the number of (m) first press-button sub-circuit and the number of (i) third press-button sub-circuits includes a fixed-value resistor having a different resistance.

19. The method according to claim 14, wherein:

each of voltage dividers of any two of all of the number of (n) second press-button sub-circuit and the number of (i) third press-button sub-circuits includes a fixed-value resistor having a different resistance.

20. The method according to claim 14, wherein the common terminal is connected to ground.