LCD CONTROLLER CHIP

• US 20090322711A1
• Filed: 06/25/2008
• Published: 12/31/2009
• Est. Priority Date: 06/25/2008
• Status: Abandoned Application

• Current Assignee: Silicon Laboratories Incorporated
• Original Assignee: Silicon Laboratories Incorporated
• Inventors: CHOWDHURY, GOLAM, WILSON, BRENT, DAVID, THOMAS S., BAR, FARRIS, CALOWAY, BRIAN, PIASECKI, DOUGLAS
• Application Number:
  US12/146,349
• Publication Number:
  US 20090322711A1
• Time in Patent Office: Days
• US Class Current: 345/204
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/18 using liquid crystals

Abstract

An integrated circuit comprises a host interface control block for providing a connection between the integrated circuit and a master controller device. The integrated circuit further includes a plurality of I/O pins. A capacitive touch sense circuitry enables detection of actuation of at least one capacitor switch of a capacitive sensor array connected to at least a portion of the plurality of I/O pins. An LCD controller drives at least one LCD connected to at least a portion of the plurality of I/O pins. The integrated circuit, responsive to signals received from the master controller device over the host interface control block, may be configured to monitor outputs from the capacitive sensor array in a first mode of operation. In a second mode of operation, the capacitive sensor array may be configured to drive at least one LCD. Finally, in a third mode of operation, the integrated circuit may be configured to both monitor outputs of the capacitive sensor array and drive the at least one LCD.

Claims

1. An integrated circuit, comprising:

a host interface control block for providing a connection between the integrated circuit and a master controller device;

a plurality of input/output pins;

capacitive touch sense circuitry enabling detection of actuation of at least one capacitive switch of a capacitive sensor array connected to at least a portion of the plurality of input/output pins;

an LCD controller for driving at least one LCD connected to at least a portion of the plurality of input/output pins; and

wherein responsive to control signals received from the master controller device over the host interface control block, the integrated circuit may be configured to monitor outputs from the capacitive sensor array in a first mode of operation, to drive the at least one LCD in a second mode of operation and to both monitor outputs of the capacitive sensor array and drive the at least one LCD in a third mode of operation.

2. The integrated circuit of claim 1, wherein the host interface control block comprises a plurality of interface communication protocols, each of the plurality of interface communications programmable selectable responsive to control signals from the master controller device.

3. The integrated circuit of claim 1, further including a GPIO Expander control block, wherein responsive to control signals received from the master controller device over the host interface control block, GPIO Expander configures the integrated circuit to operate as a GPIO Expander.

4. The integrated circuit of claim 1, further including a random access memory, wherein responsive to control signals received from the master controller device over the host interface control block, the random access memory may be used for storage by the master controller device.

5. The integrated circuit of claim 1, wherein in the first mode of operation the capacitive touch sense circuitry scans from a start pin to an end pin to detect actuations of the capacitive switches within the capacitive sensor array.

6. The integrated circuit of claim 1, wherein in the first mode of operation the capacitive touch sense circuitry scans each row of a selected column before proceeding to a next column.

7. The integrated circuit of claim 6, wherein the number of scanned rows and scanned columns are programmable responsive to control signals from the master control device.

8. An integrated circuit, comprising:

a host interface control block for providing a connection between the integrated circuit and a master controller device, wherein the host interface control block comprises a plurality of interface communication protocols, each of the plurality of interface communications programmable selectable responsive to control signals from the master controller device;

a plurality of input/output pins;

capacitive touch sense circuitry enabling detection of actuation of at least one capacitive switch of a capacitive sensor array connected to at least a portion of the plurality of input/output pins;

an LCD controller for driving at least one LCD connected to at least a portion of the plurality of input/output pins; and

wherein responsive to control signals received from the master controller device over the host interface control block, the integrated circuit may be configured to monitor outputs from the capacitive sensor array in a first mode of operation, to drive the at least one LCD in a second mode of operation and to both monitor outputs of the capacitive sensor array and drive the at least one LCD in a third mode of operation; and

wherein in the first mode of operation the capacitive touch sense circuitry scans from a start pin to an end pin to detect actuations of the capacitive switches within the capacitive sensor array in a first configuration and scans each row of a selected column before proceeding to a next column in a second configuration.

9. The integrated circuit of claim 8, further including a GPIO Expander control block, wherein responsive to control signals received from the master controller device over the host interface control block, GPIO Expander configures the integrated circuit to operate as a GPIO Expander.

10. The integrated circuit of claim 8, further including a random access memory, wherein responsive to control signals received from the master controller device over the host interface control block, the random access memory may be used for storage by the master controller device.

11. The integrated circuit of claim 8, wherein the number of scanned rows and scanned columns are programmable responsive to control signals from the master control device.

12. A method for providing programmable combinations of capacitive switch functionalities and LCD driver control functionalities, comprising the steps of:

providing a connection between an integrated circuit and a master controller device;

detecting actuation of at least one capacitive switch of a capacitive sensor array connected to at least a portion of a plurality of input/output pins when the integrated circuit is configured in a first mode of operation;

driving at least one LCD connected to at least a portion of the plurality of input/output pins in a second mode of operation; and

simultaneously detecting actuation of at least one capacitive switch of the capacitive sensor array connected to at least a portion of a plurality of input/output pins and driving at least one LCD connected to at least the portion of the plurality of input/output pins.

13. The method of claim 12, wherein the step of providing further comprises the steps of programmably selecting one of a plurality of interface communication protocols responsive to control signals from the master controller device.

14. The method of claim 12, further including the step of operating the integrated circuit as a GPIO Expander responsive to control signals received from the master controller device.

15. The method of claim 12, further including the step of providing a random access memory for storage by the master controller device responsive to control signals received from the master controller device.

16. The method of claim 12, wherein the step of detecting further comprises the step of scanning from a start pin to an end pin to detect actuations of the capacitive switches within the capacitive sensor array.

17. The method of claim 12, wherein the step of detecting further comprises the step of scanning each row of a selected column before proceeding to a next column.

18. The method of claim 17, wherein the step of scanning further includes the step of programmably selecting the number of scanned rows and scanned columns responsive to control signals from the master control device.