US 10,707,279 B2Granted

Method of sensing illuminance using passive matrix organic light emitting diode display including illuminance sensor function and method of controlling the same

AssigneeSolomon Systech (Shenzhen) Limited

InventorsHong Jae Jang, Hyung-Cheol Shin, Il-Hyun Yun, Wai Hon Ng, Yi Nok Chan, King Ho Cheung, Yip Fai Li

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Abstract

Provided is a method of sensing an illuminance in a passive matrix organic light emitting diode display, the display including a plurality of lower electrode patterns arranged in parallel, a plurality of transparent electrode patterns arranged in parallel and being perpendicular to the lower electrode patterns, and an organic compound layer interposed between the lower electrode pattern and the transparent electrode pattern, the method comprising steps of: (a) forming a predetermined voltage difference between at least one electrode patterns of the transparent electrode patterns as anodes and the lower electrode patterns as cathodes; (b) measuring the magnitude of current formed by the transparent electrode pattern and the lower electrode pattern in the step (a); and (c) measuring an illuminance using the measured current, in which a voltage supplied to the lower electrode pattern is relatively higher than that of the transparent electrode pattern in the step (a).

Claims16

Dependent claims

A method of sensing an illuminance in a passive matrix organic light emitting diode display, the display including a plurality of lower electrode patterns arranged in parallel, a plurality of transparent electrode patterns arranged in parallel and being perpendicular to the lower electrode patterns, and an organic compound layer interposed between the lower electrode pattern and the transparent electrode pattern, the method comprising steps of:

providing a reference transparent electrode pattern and a comparison transparent electrode pattern selected from the transparent electrode patterns;
providing a reference lower electrode pattern and a comparison lower electrode pattern selected from the lower electrode patterns, corresponding to the reference transparent electrode pattern and the comparison transparent electrode pattern;
blocking light flowing into the organic compound layer between the comparison transparent electrode pattern and the comparison lower electrode pattern;
and
measuring an illuminance by comparing an electric feature formed by the reference transparent electrode pattern and the reference lower electrode pattern with an electric feature formed by the comparison transparent electrode pattern and the comparison lower electrode pattern under the same conditions except for that light flowing into the organic compound layer between the comparison transparent electrode pattern and the comparison lower electrode pattern is blocked;
wherein a same predetermined voltage difference is formed between the reference transparent electrode pattern and the reference lower electrode pattern and between the comparison transparent electrode pattern and the comparison lower electrode pattern for the illuminance sensing, and
a voltage supplied to the lower electrode patterns is relatively higher than those of the transparent electrode patterns, and an illuminance is measured by measuring a magnitude of a current formed by the transparent electrode patterns and the lower electrode patterns.

4 more elements

A method of controlling a passive matrix organic light emitting diode display, the display including a plurality of lower electrode patterns arranged in parallel, a plurality of transparent electrode patterns arranged in parallel and being perpendicular to the lower electrode patterns, and an organic compound layer interposed between the lower electrode patterns and the transparent electrode patterns, to perform display output, illuminance sensing and touch sensing by time-sharing a display frame time into a display control period, an illuminance sensing period and a touch sensor control period, the method comprising steps of:

providing a driving node, which is formed on a line for connecting the transparent electrode patterns and a display driving circuit and a touch sensing unit for connecting the driving node and a touch sensing circuit;
outputting an image by connecting the transparent electrode patterns and the display driving circuit in the display control period;
sensing an illuminance by forming a predetermined voltage difference between at least one of the transparent electrode patterns and at least one of the lower electrode patterns in the illuminance sensing period;
and
sensing a touch by connecting the transparent electrode patterns and the touch sensing circuit through the touch sensing unit in the touch sensor control period,
wherein in the illuminance sensing step, a voltage supplied to the lower electrode pattern for forming the predetermined voltage difference is relatively higher than that of the transparent electrode pattern for forming the predetermined voltage difference, and the illuminance is measured by measuring the magnitude of a current formed by the transparent electrode pattern for forming a predetermined voltage difference and the lower electrode pattern for forming a predetermined voltage difference.

3 more elements

A method of controlling a passive matrix organic light emitting diode display, the display including a plurality of lower electrode patterns arranged in parallel, a plurality of transparent electrode patterns arranged in parallel and being perpendicular to the lower electrode patterns, and an organic compound layer interposed between the lower electrode pattern and the transparent electrode pattern, to implement display output, illuminance sensing and touch sensing by time-sharing a display frame time into at least one of a display control period, an illuminance sensing period and a touch sensor control period, the method comprising steps of:

providing a driving node, which is formed on a line for connecting the transparent electrode patterns and a display driving circuit and a touch sensing unit for connecting the driving node and a touch sensing circuit;
outputting an image by connecting the transparent electrode patterns and an image driving circuit in the display control period;
sensing an illuminance by forming a predetermined voltage difference between at least one of the transparent electrode patterns and at least one of the lower electrode patterns in the illuminance sensing period;
and
sensing a touch by connecting the transparent electrode patterns and the touch sensing circuit through the touch sensing unit in the touch sensor control period,
wherein the display frame time is implemented in a combination of the display control period and the illuminance sensing period or a combination of the display control period and the touch sensor control period to be formed in a regular pattern, and
wherein a voltage supplied to the lower electrode pattern for forming a predetermined voltage difference is relatively higher than that of the transparent electrode pattern for forming a predetermined voltage difference in the illuminance sensing period, and the illuminance is measured by measuring the magnitude of a current formed by the transparent electrode pattern for forming a predetermined voltage difference and the lower electrode pattern for forming a predetermined voltage difference.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/143,442Filed 26 Sep 2018
Priority: KR 10-2017-012744529 Sep 2017
Published: US 2019/0103446 A14 Apr 2019
Granted: 7 Jul 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

G09G 3/3216
Organic, e.g. using organic light-emitting diodes [OLED]: using a passive matrix
G06F 3/0412
Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means: digitisers structurally integrated in a display
G06F 3/04166
Control or interface arrangements specially adapted for digitisers: details of scanning methods, e.g. sampling time, grouping of sub areas or time…
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