Dual source drivers, display devices having the same, and methods of operating the same

Patent metadata

Field	Value
Publication number	US-11315462-B2
Application number	US-202016928480-A
Country	US
Kind code	B2
Filing date	Jul 14, 2020
Priority date	Dec 27, 2019
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

TA dual source driver includes first and second gamma voltage generators configured to generate first and second gamma voltages, respectively, first and second latches configured to latch first and second data, respectively, a first driving cell configured to receive the first gamma voltage and the first data, and to transmit a first voltage corresponding to the first data and the first gamma voltage to a panel load based on a first switching operation, and a second driving cell configured to receive the second gamma voltage and the second data, and to transmit a second voltage corresponding to the second data and the second gamma voltage to the panel load based on a second switching operation. The first switching operation and the second switching operation may operate complementarily to each other.

First claim

What is claimed is:

1. A dual source driver, comprising:
a first gamma voltage generator configured to generate a first gamma voltage;
a second gamma voltage generator configured to generate a second gamma voltage;
a first latch configured to latch first data;
a second latch configured to latch second data;
a first driving cell configured to receive the first gamma voltage from the first gamma voltage generator and to receive the first data from the first latch, and to transmit a first voltage corresponding to the first data and the first gamma voltage to a source line of a panel load based on a first switching operation; and
a second driving cell configured to receive the second gamma voltage from the second gamma voltage generator and to receive the second data from the second latch, and to transmit a second voltage corresponding to the second data and the second gamma voltage to the source line of the panel load based on a second switching operation,
wherein the first switching operation and the second switching operation operate complementarily to each other,
wherein the dual source driver is configured to operate such that
the first driving cell performs a first charging operation to output a first analog voltage based on the first gamma voltage and a received first line data concurrently with the second driving cell performing a first latency operation to generate a second analog voltage based on the second gamma voltage and a received second line data, in a first line time period, and
the first driving cell performs a second latency operation to generate a third analog voltage based on the first gamma voltage and a received third line data concurrently with the second driving cell performing a second charging operation to output the second analog voltage that is generated during the first latency operation, in a second line time period,

wherein the first gamma voltage and the second gamma voltage are a same gamma voltage.

2. The dual source driver of claim 1 , wherein
the first driving cell includes
a first digital-to-analog converter configured to convert the first data into the first analog voltage based on the first gamma voltage,
a first output amplifier configured to amplify the first analog voltage based on comparing an output value of the first digital-to-analog converter and an output value of an output terminal of the first output amplifier, and
a first switch configured to transmit an output of the first output amplifier to the panel load based on the first switching operation, and the second driving cell includes
a second digital-to-analog converter configured to convert the second data into the second analog voltage based on the second gamma voltage,
a second output amplifier configured to amplify the second analog voltage based on comparing an output value of an output terminal of the second output amplifier and an output value of the second digital-to-analog converter, and
a second switch configured to transmit an output of the second output amplifier to the panel load based on the second switching operation.

3. The dual source driver of claim 1 , wherein
the first driving cell includes
a first digital-to-analog converter configured to convert the first data into the first analog voltage based on the first gamma voltage, and
a first output amplifier configured to amplify the first analog voltage by comparing an output value of the first digital-to-analog converter and an output value of an output terminal of the first output amplifier,

the second driving cell includes
a second digital-to-analog converter configured to convert the second data into the second analog voltage based on the second gamma voltage, and
a second output amplifier configured to amplify the second analog voltage by comparing an output value of the second digital-to-analog converter and an output value of an output terminal of the second output amplifier, and

the dual source driver further includes a switch configured to share outputs for the first and second driving cells, such that the switch is configured to transmit a selected output of an output of the first output amplifier or an output of the second output amplifier to the panel load.

4. The dual source driver of claim 1 , wherein the dual source driver is configured to sequentially output analog voltages corresponding to data to the panel load after a 1-line time latency after reception of the data from an external device.

5. The dual source driver of claim 4 , wherein the 1-line time is a time between about 2 μs and about 3 μs.

6. The dual source driver of claim 1 , wherein the dual source driver is configured to sequentially output analog voltages corresponding to data to the panel load without a latency after reception of the data from an external device.

7. A display device, comprising:
a panel including a plurality of gate lines and a plurality of source lines extending in directions that cross each other, the panel further including a plurality of pixels at separate, respective intersections of gate lines and source lines;
a gate driver configured to drive any one gate line of the plurality of gate lines in response to a horizontal synchronization signal and a gate control signal;
a dual source driver configured to drive the plurality of source lines according to data; and
a timing controller configured to receive a clock signal, the data, a vertical synchronization signal, and the horizontal synchronization signal, the timing controller further configured to control the gate driver and the dual source driver,
wherein the dual source driver includes a first driving cell and a second driving cell both corresponding to each source line of the plurality of source lines in the panel, and
wherein the dual source driver is configured to operate such that
the first driving cell performs a first charging operation to output a first analog voltage based on a received first gamma voltage and a received first line data concurrently with the second driving cell performing a first latency operation to generate a second analog voltage based on a received second gamma voltage and a received second line data, in a first line time period, and
the first driving cell performs a second latency operation to generate a third analog voltage based on the received first gamma voltage and a received third line data concurrently with the second driving cell performing a second charging operation to output the second analog voltage that is generated during the first latency operation, in a second line time period,

wherein the received first gamma voltage and the received second gamma voltage are a same gamma voltage.

8. The display device of claim 7 , wherein the gate driver comprises:
a first gate driver configured to drive odd gate lines of the plurality of gate lines; and
a second gate driver configured to drive even gate lines of the plurality of gate lines.

9. The display device of claim 7 , wherein each driving cell of the first driving cell and the second driving cell comprises:
a digital-to-analog converter configured to convert received data to an analog voltage;
an output amplifier configured to amplify an output of the digital-to-analog converter; and
a switch configured to determine whether to selectively provide an output of the output amplifier to a corresponding source line from among the plurality of source lines.

10. The display device of claim 9 , wherein the output amplifier of a given driving cell of the first driving cell or the second driving cell is configured to operate in a power reduction mode in response to the given driving cell performing a latency operation.

11. The display device of cl

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Sungho
• Rho Hohak
• Lee Junjae

Classifications

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title

• G09G2320/0223

  Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes · CPC title

• G09G3/3291 Primary

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G2330/023

  using energy recovery or conservation · CPC title