# US 2018/0025689 A1 · Power efficient adaptive panel pixel charge scheme

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- Number: US 2018/0025689 A1
- Document ID: US20180025689A1
- Status: Published application
- Kind: A1
- Application number: 15/723,085
- Filed: 2017-10-02
- Published: 2018-01-25
- Earliest claimed: 2014-06-13
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: James AAMOLD; Fenghua ZHENG; Sandro H. PINTZ
- Web page: https://patentgrep.com/patent/US20180025689A1

## CPC

- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- G09G 3/2007: {Display of intermediate tones}
- G09G 3/3216: using a passive matrix
- G09G 2300/0408: Integration of the drivers onto the display substrate
- G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
- G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G 2330/021: Power management, e.g. power saving
- G09G 2330/023: using energy recovery or conservation
- G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD
- G09G 2340/16: Determination of a pixel data signal depending on the signal applied in the previous frame
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

This application relates to systems, methods, and apparatus for reducing the power consumption of a display panel. Specifically, the embodiments discussed herein relate to a panel pixel charge scheme that allows the current output of a display driver to be modified based on the content to be displayed at the display panel. The display driver can compare current and upcoming display content in order to determine how the line voltage for one or more output lines will change over time. If, based on the comparison, the voltage for an output line is not going to vary substantially over time, the bias current output from the display driver can be modified in order to save power. The modification to the bias current can depend on the amount of change the line voltage will undergo in subsequent executions of the content data.

## Claims

### Claim 1

An electronic device having a display, the display comprising:
a display panel having a matrix of pixels and one or more driver circuits for operating the matrix of pixels;
a timing controller configured to receive a line of pixel data for display by a row of pixels in the matrix of pixels; and
a power management integrated circuit configured to provide power to the display panel for operation of the matrix of pixels,
wherein the timing controller is configured to:
provide a power control signal to the power management integrated circuit based on the received line of pixel data, and
provide display data to at least one of the one or more driver circuits based on the received line of pixel data; and
wherein the power management integrated circuit is configured to provide power to the display panel based on the power control signal.

### Claim 2 (depends on 1)

The electronic device of claim 1, wherein the one or more driver circuits are configured to operate the row of pixels based on the display data using the power provided by the power management integrated circuit.

### Claim 3 (depends on 1)

The electronic device of claim 1, wherein the timing controller is further configured to:
receive a subsequent line of pixel data for display by a subsequent row of pixels in the matrix of pixels;
provide a subsequent power control signal to the power management integrated circuit based on the received subsequent line of pixel data; and
provide subsequent display data to at least one of the one or more driver circuits based on the received subsequent line of pixel data.

### Claim 4 (depends on 3)

The electronic device of claim 3, wherein the line of pixel data and the subsequent line of pixel data are lines of pixel data in a common display frame.

### Claim 5 (depends on 4)

The electronic device of claim 4, wherein the timing controller further includes:
first and second line buffers configured to store the line of pixel data and the subsequent line of pixel data; and
a power management circuit coupled to the first and second line buffers, the power management circuit configured to:
determine a line power for operating the row of pixels to display the line of pixel data;
determine a subsequent line power for operating the subsequent row of pixels to display the subsequent line of pixel data;
determine a difference between the line power and the subsequent line power; and
provide a power boost signal to the power management integrated circuit if the difference is greater than a threshold.

### Claim 6 (depends on 5)

The electronic device of claim 5, wherein the power management integrated circuit is configured to provide a power boost to the display panel responsive to the power boost signal while the second line buffer stores the subsequent line of pixel data to pre-compensate for the difference between line power and the subsequent line power.

### Claim 7 (depends on 6)

The electronic device of claim 6, wherein the timing controller is configured to provide display data based on the subsequent line of pixel data to the one or more driver circuits after the power management integrated circuit begins providing the power boost to the display panel.

### Claim 8

A method, comprising:
receiving, at a timing controller for an electronic device display, a line of pixel data to be displayed using a line of pixels in a display panel of the display;
determining, with the timing controller, an expected amount of power to be used to operate the line of pixels to display the line of pixel data; and
providing a power command to a power management integrated circuit from the timing controller based on the determined expected amount of power.

### Claim 9 (depends on 8)

The method of claim 8, further comprising providing power from the power management integrated circuit to the display panel responsive to the power command from the timing controller.

### Claim 10 (depends on 9)

The method of claim 9, further comprising providing display data based on the line of pixel data to the display panel from the timing controller.

### Claim 11 (depends on 10)

The method of claim 10, further comprising operating the line of pixels with the display panel based on the display data from the timing controller using the power provided by the power management integrated circuit based on the power command.

### Claim 12 (depends on 8)

The method of claim 8, further comprising:
receiving, at the timing controller for an electronic device display, a next line of pixel data to be displayed using a next line of pixels in the display panel;
determining, with the timing controller, a new expected amount of power to be used to operate the next line of pixels to display the next line of pixel data; and
providing a new power command to the power management integrated circuit from the timing controller based on the determined new expected amount of power.

### Claim 13 (depends on 12)

The method of claim 12, further comprising:
storing, in a first line buffer of the timing controller, the line of pixel data;
storing, in a second line buffer of the timing controller, a previous line of pixel data;
determining, with the timing controller, a power difference for the stored line of pixel data and the stored previous line of pixel data; and
providing a power boost command to the power management integrated circuit based on the determined power difference.

### Claim 14 (depends on 13)

The method of claim 13, further comprising temporarily increasing a supply voltage from the power management integrated circuit to the display panel responsive to the power boost command.

### Claim 15 (depends on 14)

The method of claim 14, further comprising:
providing display data based on the line of pixel data to the display panel from the timing controller while temporarily increasing the supply voltage.

### Claim 16 (depends on 15)

The method of claim 15, further comprising operating the line of pixels with the display panel based on the display data from the timing controller while and after temporarily increasing the supply voltage.

### Claim 17

A method, comprising:
storing, in a first line buffer of a timing controller of an electronic device display, a first line of pixel data to be displayed with a first row of pixels in the electronic device display;
storing, in a second line buffer of the timing controller, a previous line of pixel data previously or currently displayed with a second row of pixels in the electronic device display;
providing power from a power management integrated circuit to a display panel of the electronic device display based on the previous line of pixel data;
determining, with the timing controller, a power difference for the stored line of pixel data and the stored previous line of pixel data; and
providing a power boost command from the timing controller to the power management integrated circuit based on the determined power difference.

### Claim 18 (depends on 17)

The method of claim 17, further comprising providing a power boost from the power management integrated circuit to the display panel of the electronic device display responsive to the power boost command from the timing controller.

### Claim 19 (depends on 18)

The method of claim 18, further comprising operating the first row of pixels based on the first line of pixel data during and after the power boost from the power management integrated circuit.

### Claim 20 (depends on 19)

The method of claim 19, further comprising:
providing power from the power management integrated circuit based on the first line of pixel data while operating the first row of pixels and after the power boost from the power management integrated circuit.