Sensing driver, method of driving the same, and display device including the same

Patent metadata

Field	Value
Publication number	US-12482385-B2
Application number	US-202418583781-A
Country	US
Kind code	B2
Filing date	Feb 21, 2024
Priority date	Aug 31, 2023
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A sensing driver includes a sensing channel which samples a first sensing voltage of a first sensing line in a first sampling period, samples a second sensing voltage of a second sensing line in a second sampling period, and includes a sampling capacitor, a first line selection switch which connects the first sensing line to the sensing channel in a first sub-sensing period, and a second line selection switch which connects the second sensing line to the sensing channel in a second sub-sensing period. A voltage having a first initialization level is applied to a first electrode of the sampling capacitor in a first capacitor initialization period, and a voltage having a second initialization level different from the first initialization level is applied to the first electrode of the sampling capacitor in a second capacitor initialization period.

First claim

What is claimed is:

1 . A sensing driver which performs a sensing operation on a first sensing line and a second sensing line in a sensing period including a first sub-sensing period and a second sub-sensing period, comprising:
a sensing channel which samples a first sensing voltage of the first sensing line in a first sampling period of the first sub-sensing period, samples a second sensing voltage of the second sensing line in a second sampling period of the second sub-sensing period, and includes a sampling capacitor having a first electrode and a second electrode; a first line selection switch which connects the first sensing line to the sensing channel in the first sub-sensing period; and a second line selection switch which connects the second sensing line to the sensing channel in the second sub-sensing period, wherein a voltage having a first initialization level is applied to the first electrode of the sampling capacitor in a first capacitor initialization period of the first sub-sensing period, and wherein a voltage having a second initialization level different from the first initialization level is applied to the first electrode of the sampling capacitor in a second capacitor initialization period of the second sub-sensing period.

2 . The sensing driver of claim 1 , wherein the second initialization level is higher than the first initialization level.

3 . The sensing driver of claim 1 , wherein the second initialization level is preset before the sensing period.

4 . The sensing driver of claim 1 , wherein the second initialization level is set based on the first sensing voltage and the second sensing voltage.

5 . The sensing driver of claim 1 , wherein the sensing channel further includes:
a first sampling switch which connects the first and second selection switches to the first electrode of the sampling capacitor in response to a sampling signal; a first reference switch which applies a reference voltage to the second electrode of the sampling capacitor in response to a reference signal; a first initialization voltage switch which applies an initialization voltage to a first intermediate node in response to a first capacitor initialization signal; and a first capacitor initialization switch which connects the first intermediate node to the first electrode of the sampling capacitor in response to the reference signal.

6 . The sensing driver of claim 5 , further comprising: a reference channel,
wherein the reference channel includes: a reference capacitor which has a first electrode and a second electrode; a second sampling switch which applies the initialization voltage to the first electrode of the reference capacitor in response to the sampling signal; a second reference switch which applies the reference voltage to the second electrode of the reference capacitor in response to the reference signal; a second initialization voltage switch which applies the initialization voltage to a second intermediate node in response to the first capacitor initialization signal; and a second capacitor initialization switch which connects the second intermediate node to the first electrode of the reference capacitor in response to the reference signal.

7 . The sensing driver of claim 6 , wherein the initialization voltage has a first voltage level in the first capacitor initialization period, and has a second voltage level different from the first voltage level in the second capacitor initialization period.

8 . The sensing driver of claim 6 , wherein the sensing channel further includes a first reference voltage switch which applies the reference voltage to the first intermediate node in response to a second capacitor initialization signal, and
wherein the reference channel further includes a second reference voltage switch which applies the reference voltage to the second intermediate node in response to the second capacitor initialization signal.

9 . The sensing driver of claim 8 , wherein the reference voltage has a third voltage level in the first capacitor initialization period, and has a fourth voltage level different from the third voltage level in the second capacitor initialization period.

10 . The sensing driver of claim 8 , wherein the sensing channel further includes a first external voltage switch which applies an external voltage to the first intermediate node in response to a third capacitor initialization signal, and
wherein the reference channel further includes a second external voltage switch which applies the external voltage to the second intermediate node in response to the third capacitor initialization signal.

11 . The sensing driver of claim 10 , wherein the external voltage has a fifth voltage level in the first capacitor initialization period, and has a sixth voltage level different from the fifth voltage level in the second capacitor initialization period.

12 . The sensing driver of claim 1 , further comprising:
a sensing line initialization circuit which simultaneously initializes the first sensing line and the second sensing line in the first sub-sensing period.

13 . The sensing driver of claim 1 , further comprising:
an analog-to-digital converter; and a switch matrix which connects the sensing channel to the analog-to-digital converter.

14 . The sensing driver of claim 1 , wherein the sensing period includes:
the first sub-sensing period in which a first sensing operation on the first sensing line is performed; the second sub-sensing period in which a second sensing operation on the second sensing line is performed; and a data output period in which first sensing data corresponding to the first sensing voltage and second sensing data corresponding to the second sensing voltage is output,
wherein the first sub-sensing period includes:
a sensing line initialization period in which the first sensing line and the second sensing line are simultaneously initialized;
the first capacitor initialization period in which the sampling capacitor is initialized;
the first sampling period in which the first sensing voltage is sampled; and
a first analog-to-digital conversion period in which the first sensing voltage is converted into the first sensing data,

wherein the second sub-sensing period includes:
the second capacitor initialization period in which the sampling capacitor is initialized;
the second sampling period in which the second sensing voltage is sampled; and
a second analog-to-digital conversion period in which the second sensing voltage is converted into the second sensing data.

15 . The sensing driver of claim 1 , wherein the sensing driver performs a sensing operation on N odd-numbered sensing lines, where N is a natural number greater than or equal to 2, including the first sensing line and N even-numbered sensing lines including the second sensing line in the sensing period,
wherein the sensing driver comprises: N sensing channels which include the sensing channel; N first line selection switches which connect the N odd-numbered sensing lines to the N sensing channels in the first sub-sensing period; N second line selection switches which connect the N even-numbered sensing lines to the N sensing channels in the second sub-sensing period; an analog-to-digital converter; and a switch matrix which sequentially connects the N sensing channels to the analog-to-digital converter in a first analog-to-digital conversion period of the first sub-sensing period, and sequentially connects the N sensing channels to the analog-to-digital converter in a second analog-to-digital conversion period of the

Assignees

• Samsung Display Co Ltd

Inventors

• Jung Hayong

Classifications

• G09G2300/0852

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• G09G2330/12

  Test circuits or failure detection circuits included in a display system, as permanent part thereof · CPC title

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G3/3258

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title