US 10,095,332 B2Granted

Pixel charging and discharging rate control systems and methods

AssigneeApple Inc.

InventorsKasra Omid-Zohoor, Jie Won Ryu, Jiayi Jin, Hyunwoo Nho

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Abstract

Systems and methods for improving display image quality on electronic displays are provided. One embodiment of an electronic display includes display pixels that share a common electrode. Each of the display pixels includes a first conductive path electrically coupled between a pixel electrode and a data line, in which the first conductive path only enables the data line to charge the pixel electrode; and a second conductive path electrically coupled between the pixel electrode and the data line in parallel with the first conductive path, in which the second conductive path enables the data line to discharge the pixel electrode such that discharge rate of the pixel electrode is approximately equal to charge rate of the pixel electrode. Additionally, the embodiment includes a touch pixel that detects occurrence and position of a touch on a screen of the electronic display using the first common electrode.

Claims28

Dependent claims

An electronic display comprising:

a first display pixel, wherein the first display pixel comprises:
a first pixel electrode configured to produce a first electric field with a first common electrode to control luminance of the first display pixel;
a first transistor electrically coupled to the first pixel electrode, wherein:
the first transistor comprises a first gate coupled to a gate line;
and
the first transistor is configured to control charging and discharging of the first pixel electrode through the first transistor based at least in part on a gate signal received from the gate line;
and
a second transistor electrically coupled in series with a diode, wherein:
the second transistor and the diode are electrically coupled in parallel with the first transistor;
the second transistor comprises a second gate coupled to the gate line;
and
the second transistor is configured to control charging of the first pixel electrode through the diode based at least in part on the gate signal received from the gate line;
and
a touch pixel comprising the first common electrode, wherein the first common electrode is configured to indicate occurrence and position of a touch on a screen of the electronic display based at least in part on a change in mutual capacitance with a second common electrode.

11 more elements

An electronic device comprising:

a first plurality of display pixels configured to share a first common electrode, wherein each of the first plurality of display pixels comprises:
a pixel electrode configured to store voltage received from a data line;
a first conductive path electrically coupled between the pixel electrode and the data line, wherein the first conductive path is configured to only enable the data line to charge the pixel electrode;
and
a second conductive path electrically coupled between the pixel electrode and the data line in parallel with the first conductive path, wherein the second conductive path is configured to enable the data line to discharge the pixel electrode with a discharge rate approximately equal to a charge rate of the pixel electrode;
and
a touch pixel comprising the first common electrode, wherein the touch pixel is configured to detect occurrence and position of a touch on a screen of an electronic display using the first common electrode.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/808,882Filed 24 Jul 2015
Published: US 2017/0024043 A126 Jan 2017
Granted: 9 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G06F 3/0412
Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means: digitisers structurally integrated in a display
G06F 3/0445
By capacitive means: using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
G09G 3/3648
Control of matrices with row and column drivers: using an active matrix
G06F 2203/04103
Indexing scheme relating to G06F3/041 - G06F3/045: manufacturing, i.e. details related to manufacturing processes specially suited for touch…