Source driver integrated circuit, controller, organic light emitting display panel, organic light emitting display device, and method for driving organic light emitting display device

• US 10,339,872 B2
• Filed: 06/29/2016
• Issued: 07/02/2019
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Park, YongKyu
• Primary Examiner(s): Mercedes, Dismery
• Application Number:
  US15/196,344
• Publication Number:
  US 20170004776A1
• Time in Patent Office: 1,098 Days
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2310/0264 Details of driving circuits
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/0297 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 Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0295 by monitoring each display pixel
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 3/30 using electroluminescent panels
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3275 Details of drivers for data electrodes

Abstract

There are provided a source driver integrated circuit, a controller, an organic light emitting display panel, an organic light emitting display device, and a method for driving the organic light emitting display device. Thus, it is possible to provide a structure in which different sensing components configured to sense sub-pixel characteristics can sense characteristics of the same sub-pixel together, and the structure enables more accurate recognition of a sensing difference between the sensing components on the basis of sensing values obtained from the respective sensing components and the sensing difference to be corrected using the recognized sensing difference. Thus, an image quality can be improved.

Claims

1. An organic light emitting display device, comprising:

a first source driver integrated circuit electrically connected to Q (where Q≥

1) number of first sensing lines through a corresponding number of Q sensing channels, and electrically connected to at least one first difference sensing line through a corresponding difference sensing channel; and

a second source driver integrated circuit electrically connected to S (where S≥

1) number of second sensing lines through a corresponding number of S sensing channels, and electrically connected to at least one second difference sensing line through a corresponding difference sensing channel;

wherein the at least one difference sensing line electrically connected to the first source driver integrated circuit is configured to electrically connect at least one second sensing line of the S number of second sensing lines and the first source driver integrated circuit,

wherein the first source driver integrated circuit includes;

a first sample and hold circuit configured to store a voltage of each of the Q number of first sensing lines and the at least one difference sensing line, and

a first analog-digital converter electrically connected to the a first sample and hold circuit, and

wherein the second source driver integrated circuit includes;

a second sample and hold circuit configured to store a voltage of each of the S number of second sensing lines, and

a second analog-digital converter electrically connected to the second sample and hold circuit, and

wherein the second sample and hold circuit and the first sample and hold circuit store analog voltage values of the at least one second sensing line and the at least one difference sensing line respectively during a same sensing period.

2. The organic light emitting display device according to claim 1, wherein:

the Q number of first sensing lines are electrically connected to a first sub-pixel, which is supplied with a data voltage from the first source driver integrated circuit;

the S number of second sensing lines are electrically connected to a second sub-pixel, which is supplied with a data voltage from the second source driver integrated circuit; and

the at least one difference sensing line electrically connected to the first source driver integrated circuit is not electrically connected to the first sub-pixel, which is supplied with a data voltage from the first source driver integrated circuit, but is electrically connected to the second sub-pixel, which is supplied with a data voltage from the second source driver integrated circuit.

3. The organic light emitting display device according to claim 1, wherein the at least one difference sensing line electrically connected to the first source driver integrated circuit or the second source driver integrated circuit is located in an organic light emitting display panel.

4. The organic light emitting display device according to claim 1, wherein the at least one difference sensing line electrically connected to the first source driver integrated circuit is located in a printed circuit board electrically connected to the first source driver integrated circuit and the second source driver integrated circuit.

5. The organic light emitting display device according to claim 1, further comprising an analog-digital conversion difference correction unit configured to:

receive first sensing data including a first sensing value converted into a digital value from an analog voltage value of each of at least one second sensing line from the first analog-digital converter within the first source driver integrated circuit through the at least one difference sensing line;

receive second sensing data including a second sensing value converted into a digital value from an analog voltage value of the at least one second sensing line from the second analog-digital converter within the second source driver integrated circuit, compare the first sensing data and the second sensing data;

recognize an analog-digital conversion difference between the first analog-digital converter and the second analog-digital converter based on a comparison result; and

perform an analog-digital conversion difference correction process.

6. The organic light emitting display device according to claim 5, wherein:

two or more difference sensing lines are configured to electrically connect two or more second sensing lines of the S number of second sensing lines and the first source driver integrated circuit; and

the analog-digital conversion difference correction unit is further configured to;

calculate a first average sensing value by averaging two or more first sensing values included in the first sensing data received from the first analog-digital converter;

calculate a second average sensing value by averaging two or more sensing values included in the second sensing data received from the second analog-digital converter;

recognize the analog-digital conversion difference based on a difference between the first average sensing value and the second average sensing value; and

perform the analog-digital conversion difference correction process by correcting at least one of sensing data to be received from the first analog-digital converter and sensing data to be received from the second analog-digital converter based on the analog-digital conversion difference.

7. The organic light emitting display device according to claim 1, wherein:

one difference sensing line electrically connected to the first source driver integrated circuit is configured to electrically connect one second sensing line of the S number of second sensing lines and the first source driver integrated circuit; and

the one difference sensing line and the one second sensing line are disposed as one body on the same layer.

8. The organic light emitting display device according to claim 1, wherein:

two or more difference sensing lines are configured to electrically connect two or more second sensing lines of the S number of second sensing lines and the first source driver integrated circuit;

two or more second sensing lines of the S number of second sensing lines electrically connected to the second source driver integrated circuit and the two or more difference sensing lines electrically connected to the first source driver integrated circuit are disposed on the same layer as being separated from each other;

between one of the two or more difference sensing lines and one of the two or more second sensing lines, another one of the two or more difference sensing lines or another one of the two or more second sensing lines is present; and

the one of the two or more difference sensing lines and the one of the two or more second sensing lines are electrically connected to each other through a connection line disposed on another layer.

9. A plurality of source driver integrated circuit circuits, comprising:

a first source driver integrated circuit including;

an analog-digital converter electrically connected to Q number of first sensing lines through Q (where Q≥

1) number of sensing channels and electrically connected to at least one difference sensing line through at least one difference sensing channel; and

a sample and hold circuit configured to store a voltage of each of the Q number of first sensing lines and the at least one difference sensing line; and

a second source driver integrated circuit electrically connected to S number of sensing lines through S (where S≥

1) number of sending channels, and including a sample and hold circuit configured to store a voltage of each of the S number of second sensing lines,

wherein the analog-digital converter is configured to sequentially convert the voltage of each of the Q number of first number of sensing lines and the at least one difference sensing line from the sample and hold circuit into sensing values, which are digital values,

wherein the at least one difference sensing line is configured to electrically connect at least one second sensing line of the S number of second sensing lines to the first source driver integrated circuit, and

wherein the sample and hold circuit of the second source driver integrated circuit and the sample and hold circuit of the first source driver integrated circuit store analog voltage values of at least one of the S number of second sensing lines and the at least one difference sensing line respectively during a same sensing period.

10. An organic light emitting display device, comprising:

a first analog-digital converter electrically connected to Q (where Q≥

1) number of first sensing lines;

a second analog-digital converter electrically connected to S (where S≥

1) number of second sensing lines; and

at least one difference sensing line configured to electrically connect at least one second sensing line of the S number of second sensing lines and the first analog-digital converter,

wherein the organic light emitting display device further comprising;

a first sample and hold circuit, through which the at least one difference sensing line electrically connects the at least one second sensing line of the S number of second sensing lines and the first analog-digital converter, and configured to store a first voltage of each of the Q number of first sensing lines and the at least one difference sensing line; and

a second sample and hold circuit configured to store a second voltage of each of the S number of second sensing lines,

wherein the first analog-digital converter sequentially converts the first voltage of each of the Q number of sensing lines and the at least one difference sensing line from the first sample and hold circuit into first sensing values, which are digital values, and the second analog-digital converter sequentially converts the second voltage of each of the S number of sensing lines from the second sample and hold circuit into second sensing values, which are digital values, and

wherein the second sample and hold circuit and the first sample and hold circuit store analog voltage values of at least one of the S number of second sensing lines and the at least one difference sensing line respectively during a same sensing period.

11. A method for driving an organic light emitting display device including a first source driver integrated circuit and a second source driver integrated circuit, the method comprising:

sensing an analog voltage value of a second sensing line electrically connected to a second analog-digital converter within the second source driver integrated circuit, storing the analog voltage value by a second sample and hold circuit and converting the stored analog voltage value into a second sensing value, which is a digital value, by the second analog-digital converter;

sensing an analog voltage value of the second sensing line electrically connected to a difference sensing line electrically connected to a first analog-digital converter within the first source driver integrated circuit, storing the analog voltage value of the second sensing line electrically connected to the difference sensing line by a first sample and hold circuit and converting the stored analog voltage value into a first neighbor sensing value, which is a digital value, by the first analog-digital converter through the difference sensing line; and

correcting an analog-digital conversion difference between the first analog-digital converter and the second analog-digital converter by comparing the first neighbor sensing value and the second sensing value,

wherein the first neighbor sensing value and the second sensing value are based on analog voltage values from the first sample and hold circuit and the second sample and hold circuit during a same sensing period.

12. The method for driving an organic light emitting display device according to claim 11, wherein both the first neighbor sensing value and the second sensing value include a voltage component among sub-pixel characteristics of a sub-pixel connected to the second sensing line.

13. An organic light emitting display device, comprising:

a first sensing data receiving unit configured to receive first sensing data including a first neighbor sensing value generated by a first analog-digital converter electrically connected to at least one second sensing line that is electrically connected to a second sensing data receiving unit through at least one difference sensing line;

the second sensing data receiving unit configured to receive second sensing data including a second sensing value generated by a second analog-digital converter that is electrically connected to the at least one second sensing line; and

an analog-digital conversion difference correction unit configured to correct a successive first sensing value and a successive second sensing value based on the first neighbor sensing value and the second sensing value,

wherein the first sensing value and the second sensing value are sensing values of characteristics corresponding to a same sub-pixel, and are based on analog voltage values from a first sample and hold circuit, through which the at least one difference sensing line electrically connects the at least one second sensing line and the first analog-digital converter, and a second sample and hold circuit, through which the at least one second sensing line is electrically connected to the second analog-digital converter, during a same sensing period.

14. The controller according to claim 13, wherein the first sensing data further includes first sensing value of characteristics of sub-pixels, which are data-driven by a first source driver integrated circuit including the first analog-digital converter.