DISPLAY APPARATUS AND METHOD OF DRIVING THE SAME

• US 20200135137A1
• Filed: 10/28/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: KIM, Jongman, KIM, Yong-Bum, YEO, Dong-Hyun, JEON, Byung Kil, JUNG, Woojung
• Granted Patent: US 11,107,435 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display apparatus includes a display panel, a position detector, a driving controller, a gate driver and a data driver. The display panel is configured to display an image. The position detector is configured to determine a position of a user. The driving controller is configured to generate an overdriving value according to a grayscale value of previous frame data and a grayscale value of present frame data. The gate driver is configured to output gate signals to the display panel. The data driver is configured to output data voltages to the display panel based on the overdriving value.

Claims

1. A display apparatus comprising:

a display panel configured to display an image;

a position detector configured to determine a position of a user;

a driving controller configured to generate an overdriving value according to a grayscale value of previous frame data and a grayscale value of present frame data;

a gate driver configured to output gate signals to the display panel; and

a data driver configured to output data voltages to the display panel based on the overdriving value,

wherein the driving controller is further configured to;

receive a plurality of overdriving data of a plurality of viewing angles;

determine a fixed parameter based on the plurality of overdriving data of the plurality of viewing angles;

determine a viewing angle of the user based on the position of the user;

determine a variable parameter based on the fixed parameter and the viewing angle;

generate an overdriving reference line based on the fixed parameter and the variable parameter;

receive shift overdriving data generated for a grayscale value which is different from the grayscale value of each of the plurality of overdriving data;

determine a shift value of the overdriving reference line according to grayscale values based on the shift overdriving data; and

generate the overdriving value based on the overdriving reference line and a shifted overdriving reference line.

2. The display apparatus of claim 1, wherein the driving controller comprises:

a position calculator configured to determine the viewing angle of the user based on the position of the user;

an operator configured to determine the fixed parameter and the variable parameter, generate the overdriving reference line, determine the shift value of the overdriving reference line and generate the overdriving value; and

a memory configured to store an overdriving lookup table generated based on the overdriving reference line and the shifted overdriving reference line.

3. The display apparatus of claim 1, wherein the plurality of the overdriving data comprises:

a first overdriving data group measured in a first viewing angle when the grayscale value of the previous frame data is a first grayscale value;

a second overdriving data group measured in a second viewing angle when the grayscale value of the previous frame data is the first grayscale value; and

a third overdriving data group measured in a third viewing angle when the grayscale value of the previous frame data is the first grayscale value.

4. The display apparatus of claim 3, wherein the plurality of the overdriving data further comprises a default overdriving data group measured regardless of the viewing angle when the grayscale value of the previous frame data is the first grayscale value.

5. The display apparatus of claim 4, wherein the first overdriving data group comprises:

a first overdriving data measured in the first viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is a second grayscale value; and

a second overdriving data measured in the first viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is a third grayscale value,

wherein the default overdriving data group comprises;

a third overdriving data measured when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is the first grayscale value; and

a fourth overdriving data measured when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is a maximum grayscale value.

6. The display apparatus of claim 5, wherein the overdriving reference line in the first viewing angle is defined as Polynomial 1,

wherein the Polynomial 1 is DOD−

DPF=A(DCF)³+B1(DCF)²+C(DCF)+D,

where DOD is the overdriving value, DPF is the grayscale value of the previous frame data, and DCF is the grayscale value of the present frame data,

wherein an operator is configured to determine parameters A, B1, C and D in the Polynomial 1 utilizing the first overdriving data, the second overdriving data, the third overdriving data, and the fourth overdriving data.

7. The display apparatus of claim 6, wherein the operator is configured to determine the parameters A, C and D in the Polynomial 1 as the fixed parameters.

8. The display apparatus of claim 7, wherein the second overdriving data group comprises:

a fifth overdriving data measured in the second viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is the second grayscale value; and

a sixth overdriving data measured in the second viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is the third grayscale value,

wherein the third overdriving data group comprises;

a seventh overdriving data measured in the third viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is the second grayscale value; and

an eighth overdriving data measured in the third viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is the third grayscale value.

9. The display apparatus of claim 8, wherein the overdriving reference line in the second viewing angle is defined as Polynomial 2,

wherein the Polynomial 2 is DOD−

DPF=A(DCF)³+B2(DCF)²+C(DCF)+D, wherein the operator is configured to determine a parameter B2 of the Polynomial 2 utilizing the fifth overdriving data and the sixth overdriving data and the fixed parameters A, C and D in Polynomial 1,

wherein the overdriving reference line in the third viewing angle is defined as Polynomial 3,

wherein the Polynomial 3 is DOD−

DPF=A(DCF)³+B3(DCF)²+C(DCF)+D, and

wherein the operator is configured to determine a parameter B3 of the Polynomial 3 utilizing the seventh overdriving data and the eighth overdriving data and the fixed parameters A, C and D in Polynomial 1.

10. The display apparatus of claim 9, wherein the operator is further configured to determine parameters α

, β and

γ

representing relationships between the first viewing angle, B1 in the Polynomial 1, the second viewing angle, B2 in the Polynomial 2, the third viewing angle, and B3 in the Polynomial 3.

11. The display apparatus of claim 10, wherein the operator is further configured to determine the variable parameter according to the viewing angle utilizing Polynomial 4,

wherein the Polynomial 4 is Y=α

X²+β

X+γ

, and

wherein Y is the variable parameter and X is the viewing angle.

12. The display apparatus of claim 5, wherein the driving controller comprises an operator, and the operator is configured to determine the shift value of the overdriving reference line based on the shift overdriving data measured in the first viewing angle when the grayscale value of the previous frame data is a fourth grayscale value and the grayscale value of the present frame data is a fifth grayscale value.

13. The display apparatus of claim 5, wherein the driving controller comprises an operator, and the operator is configured to determine the shift value of the overdriving reference line based on a first shift overdriving data, a second shift overdriving data, and a third shift overdriving data,

wherein the first shift overdriving data is measured in the first viewing angle when the grayscale value of the previous frame data is a fourth grayscale value and the grayscale value of the present frame data is a fifth grayscale value,

wherein the second shift overdriving data is measured in the second viewing angle when the grayscale value of the previous frame data is the fourth grayscale value and the grayscale value of the present frame data is the fifth grayscale value, and

wherein the third shift overdriving data is measured in the third viewing angle when the grayscale value of the previous frame data is the fourth grayscale value and the grayscale value of the present frame data is the fifth grayscale value.

14. The display apparatus of claim 1, wherein the driving controller is configured to determine the viewing angle of the user based on the position of the user in real time, and

wherein the driving controller is configured to update the variable parameter, the overdriving reference line and the overdriving value based on the viewing angle of the user in real time.

15. A method of driving a display apparatus, the method comprising:

determining a fixed parameter based on a plurality of overdriving data of a plurality of viewing angles;

determining a position of a user with respect to a display panel;

determining a viewing angle of the user based on the position of the user;

determining a variable parameter based on the fixed parameter and the viewing angle;

generating an overdriving reference line based on the fixed parameter and the variable parameter;

determining a shift value of the overdriving reference line according to grayscale values based on shift overdriving data generated for a grayscale value which is different from the grayscale value of each of the plurality of overdriving data;

generating an overdriving value based on the overdriving reference line and a shifted overdriving reference line;

generating a data voltage based on the overdriving value; and

outputting the data voltage to the display panel.

16. The method of claim 15, wherein the plurality of overdriving data comprises:

a first overdriving data group measured in a first viewing angle when the grayscale value of a previous frame data is a first grayscale value;

a second overdriving data group measured in a second viewing angle when the grayscale value of the previous frame data is the first grayscale value;

a third overdriving data group measured in a third viewing angle when the grayscale value of the previous frame data is the first grayscale value; and

a default overdriving data group measured regardless of the viewing angle when the grayscale value of the previous frame data is the first grayscale value.

17. The method of claim 16, wherein the first overdriving data group comprises:

a first overdriving data measured in the first viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of a present frame data is a second grayscale value; and

a second overdriving data measured in the first viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is a third grayscale value, and

wherein the default overdriving data group comprises;

a third overdriving data measured when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is the first grayscale value; and

a fourth overdriving data measured when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is a maximum grayscale value.

18. The method of claim 17, wherein the overdriving reference line in the first viewing angle is defined as Polynomial 1,

wherein the Polynomial 1 is DOD−

DPF=A(DCF)³+B1(DCF)²+C(DCF)+D,

where DOD is the overdriving value, DPF is the grayscale value of the previous frame data, and DCF is the grayscale value of the present frame data,

wherein parameters A, B1, C and D in the Polynomial 1 are determined utilizing the first overdriving data, the second overdriving data, the third overdriving data, and the fourth overdriving data.

19. The method of claim 18, wherein the second overdriving data group comprises:

a fifth overdriving data measured in the second viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is the second grayscale value; and

a sixth overdriving data measured in the second viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is the third grayscale value,

wherein the third overdriving data group comprises;

a seventh overdriving data measured in the third viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is the second grayscale value; and

an eighth overdriving data measured in the third viewing angle when the grayscale value of the previous frame data is the first grayscale value and the grayscale value of the present frame data is the third grayscale value,

wherein the overdriving reference line in the second viewing angle is defined as Polynomial 2,

wherein the Polynomial 2 is DOD−

DPF=A(DCF)³+B2(DCF)²+C(DCF)+D,

wherein a parameter B2 of the Polynomial 2 is determined utilizing the fifth overdriving data and the sixth overdriving data and the fixed parameters A, C and D in Polynomial 1,

wherein the overdriving reference line in the third viewing angle is defined as Polynomial 3,

wherein the Polynomial 3 is DOD−

DPF=A(DCF)³+B3(DCF)²+C(DCF)+D, and

wherein a parameter B3 of the Polynomial 3 is determined utilizing the seventh overdriving data and the eighth overdriving data and the fixed parameters A, C and D in Polynomial 1.

20. The method of claim 19, wherein the variable parameter according to the viewing angle is determined utilizing Polynomial 4,

wherein the Polynomial 4 is Y=α

X²+β

X+γ

, and

where Y is the variable parameter and X is the viewing angle, parameters α

, β and

γ

represent relationships between the first viewing angle, B1 in the Polynomial 1, the second viewing angle, B2 in the Polynomial 2, the third viewing angle, and B3 in the Polynomial 3.