US 2019/0244555 A1Published application

Noise mitigation for display panel sensing

AssigneeApple Inc.

InventorsHung Sheng Lin, Shengkui Gao, Hyunwoo Nho, Chin-Wei Lin, Mohammad B. Vahid Far, Jie Won Ryu, Kingsuk Brahma, Junhua Tan, Sun-II Chang, Shinya Ono, Jesse Aaron Richmond, Yafei Bi, Derek K. Shaeffer, Myungjoon Choi, Shiping Shen

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Abstract

Systems and methods are provided for differential sensing (DS), difference-differential sensing (DDS), correlated double sampling (CDS), correlated-correlated double sampling (CDS-CDS) and/or programmable capacitor matching to reduce display panel sensing noise. An electronic device may include one or more processors that generate image data according to sensing operations. The one or more processors may reference a sensing pattern as part of sensing operations. Applying test sensing signals based on the sensing pattern may help reduce error associated with sensing operations.

Claims20

Dependent claims

An electronic device comprising:

one or more processors configured to generate image data and adjust the image data based at least in part on display sensing feedback;
a memory storing a sensing pattern configured to be followed when applying test data during sensing operations to obtain the display sensing feedback;
and
an electronic display comprising:
an active area configured to display an image frame corresponding to the image data;
and
sensing circuitry configured to obtain the display sensing feedback at least in part by:
applying first test data to a first sensing region of the active area based at least in part on the sensing pattern;
differentially sensing an electrical value of the first sensing region in comparison to an electrical value of a second sensing region not applied with the first test data to generate a first determined difference comprising a positive polarity sensing error;
applying second test data to a third sensing region of the active area based at least in part on the sensing pattern;
differentially sensing an electrical value of the third sensing region in comparison to an electrical value of a fourth sensing region not applied with the second test data to generate a second determined difference comprising a negative polarity sensing error;
and
filtering the first determined difference and the second determined difference, wherein the positive polarity sensing error is reduced from the first determined difference after the filtering thereby further enhancing a quality of the sensed electrical value of the first sensing region.

10 more elements

An electronic display comprising:

an active area with a plurality of sensing regions;
and
a driver integrated circuit configured to:
receive a varying sensing pattern, wherein the varying sensing pattern defines a first subset of the plurality of sensing regions that are to receive test data of a sensing operation, wherein the varying sensing pattern defines a second subset of the plurality of sensing regions that are to not receive test data of the sensing operation, wherein the varying sensing pattern defines an arrangement of respective sensing regions of the first subset of the plurality of sensing regions and of the second subset of the plurality of sensing regions based at least in part on expected polarities of sensing error outputs;
sense a first property of the sensing regions at least in part by driving sensing circuitry based at least in part on the sensing pattern to generate sensed data;
and
reduce a noise component of the sensed data at least in part by filtering the sensed data.

4 more elements

A method comprising:

differentially sensing a plurality of sensing regions at least partially driven with test data according to an alternating sensing pattern to obtain sensed data with reduced common mode noise;
filtering the sensed data with reduced common mode noise to obtain sensed data with reduced content-dependent error;
determining an adjustment to apply to an operation of an electronic device based at least in part on the sensed data with reduced content-dependent error;
and
applying the determined adjustment to the operation of the electronic device.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/389,899Filed 19 Apr 2019
Priority: 21 Sep 2016
Published: 8 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G09G 3/006
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes: electronic inspection or…
G09G 3/20
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes: for presentation of an…
G09G 2310/0291
Details of driving circuits: details of output amplifiers or buffers arranged for use in a driving circuit
G09G 2320/029
Improving the quality of display appearance: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel

Family

Application62/397,845Us provisional application · filed 21 Sep 2016
Application15/698,262Continuation in part · filed 7 Sep 2017
Application16/361,018Continuation in part · filed 21 Mar 2019
Application16/389,899Continuation in part
US 10,559,238 B2Related patent
US 10,573,211 B2Related patent
US 10,755,618 B2Related patent
US 2018/0082621 A1Published application
US 2019/0221146 A1Published application
US 2019/0244555 A1This patent

From the US filing history. Foreign family members aren’t listed.

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