Display driving device including source driver and timing controller and operating method for controlling source line slew times

Patent metadata

Field	Value
Publication number	US-10679534-B2
Application number	US-201815868322-A
Country	US
Kind code	B2
Filing date	Jan 11, 2018
Priority date	Jun 9, 2017
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A display driving device is disclosed which includes a source driver that supplies voltages to source lines connected to pixels, detects a slew time of the voltages of the source lines, and outputs the slew time, and a timing controller that receives the slew time from the source driver and updates a way for the source driver to control the voltages depending on the slew time.

First claim

What is claimed is:

1. A display driving device comprising:
a source driver configured to,
receive information of voltage levels to be displayed on a pixel array,
supply voltages to a plurality of source lines connected to the pixel array based on the information of the voltage levels,
detect a first slew time of at least one first voltage of at least one first source line among the source lines by measuring an amount of time for the at least one first voltage to reach a corresponding target level indicated by the information of the voltage levels, and
output the first slew time; and

a timing controller configured to receive the first slew time from the source driver and to transmit update information for the source driver to control the voltages based on the first slew time,
wherein the source driver includes,
a first driver physical block configured to receive the information and a detection request of the first slew time from the timing controller;
a second driver physical block configured to output the first slew time to the timing controller; and
a plurality of driving blocks respectively connected to the source lines and configured to drive the voltages respectively based on the information, the plurality of driving blocks including at least one first driving block, the at least one first driving block including a first slew time detector configured to detect the first slew time, and

wherein each of the plurality of driving blocks further includes a block driver, and a storage device configured to store corresponding update information among the update information related to timing information when the block driver controls the voltage, or a target slew time when the block driver controls the voltage.

2. The display driving device of claim 1 , wherein the timing controller is configured to:
detect the first slew time in a first mode; and
update timings of the source driver to adjust the at least one first voltage in a second mode.

3. The display driving device of claim 1 , wherein each of the block drivers included in the plurality of driving blocks are configured to:
control a voltage of a corresponding source line based on corresponding information among the information of the voltages; and
control the voltage based on the corresponding update information stored in the storage device.

4. The display driving device of claim 1 , wherein
the plurality of driving blocks includes at least one second driving block, the at least one second driving block including a second slew time detector configured to detect a second slew time;
the source driver is configured to output the second slew time along with the first slew time to the timing controller through the second driver physical block; and
the timing controller is configured to generate the update information by using a result of computing the first slew time and the second slew time.

5. The display driving device of claim 1 , wherein the source driver is configured to:
receive a detection request of the first slew time through a first channel; and
detect the first slew time in response to the detection request.

6. The display driving device of claim 5 , wherein the source driver is configured to:
adjust the voltages from a positive minimum value to a positive maximum value based on the voltage information when measuring the amount of time.

7. The display driving device of claim 5 , wherein the source driver is configured to output the first slew time to the timing controller through a second channel different from the first channel.

8. The display driving device of claim 5 , wherein the timing controller is configured to transmit the update information to control the at least one first voltage through the first channel.

9. The display driving device of claim 1 , wherein the timing controller includes:
a micro control unit configured to output first configuration information including the update information;
one or more ports configured to output the information of the voltages through a first controller physical block; and
a controller configured to transfer first image data from an external device and the first configuration information from the micro control unit to the one or more ports in a normal mode, and to transfer second test image data and second test configuration information to the one or more ports in a compensation mode.

10. The display driving device of claim 9 , wherein
the timing controller further includes a receiver configured to receive the first slew time from the source driver through a second controller physical block in the compensation mode; and
the micro control unit is configured to update the update information of the first configuration information based on the first slew time.

11. A display driving device comprising:
a plurality of source drivers configured to receive information of voltage levels to be displayed on a pixel array, supply voltages to a plurality of source lines connected to the pixel array, detect slew times of at least a part of the source lines by measuring amount of times for the at least a part of the voltages to reach corresponding target levels indicated by the information, and to output the slew times; and
a timing controller configured to receive the slew times from the plurality of source drivers and to transmit update information to the plurality of source drivers based on the slew times so that the plurality of source drivers uniformly control the voltages,
wherein the timing controller includes,
a micro control unit configured to output first configuration information including the update information;
one or more ports configured to output the information through a first controller physical block;
a receiver configured to receive the slew times from the plurality of source drivers through a second controller physical block; and
the micro control unit is configured to update the update information of the first configuration information based on the slew times.

12. The display driving device of claim 11 , wherein when the voltages of the plurality of source drivers change from a positive minimum value to a positive maximum value,
the timing controller is configured to update the plurality of source drivers so that points in time when the voltages reaches 90% of the maximum value are uniform.

13. The display driving device of claim 11 , wherein the timing controller is configured to update one or more of timings associated with one or more of the plurality of source drivers when the one or more of the source drivers start to control the voltages based on the slew times by updating the update information.

14. The display driving device of claim 11 , wherein when the plurality of source drivers supply the voltages to the source lines in connection with partial pixels of a blank area of the pixel array, the timing controller is configured to control the plurality of source drivers so as to detect the slew times.

15. The display driving device of claim 11 , wherein the timing controller is configured to:
control the plurality of source drivers to detect the slew times after a boot-up operation; and
update the plurality of source drivers based on the detected slew times by updating the update information.

16. The display driving device of claim 11 , wherein the timing controller is configured to:
control the plurality of source drivers based on a request of an external device to detect the slew times; and
update the source drivers based on the slew times by updating the update information.

17. The display driving

Assignees

• Samsung Electronics Co Ltd

Inventors

• Ryu Keunho
• Kim Byungkoan
• Na Jong-Hee
• Park Yong-Yun
• Baek Seunghwan
• Chae Myeongjun
• Choi Youngmin

Classifications

• G09G2310/0297

  Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title

• G09G2330/12

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

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title