Display apparatus, method for compensating for data signal thereof, and method for generating deep learning-based compensation model

Patent metadata

Field	Value
Publication number	US-11854497-B2
Application number	US-202118012550-A
Country	US
Kind code	B2
Filing date	Jun 21, 2021
Priority date	Jun 24, 2020
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

The present invention relates to a display apparatus that allows a compensated data voltage to be supplied to each pixel by compensating for the data voltage so as to prevent burn-in from occurring in a display panel, a method for compensating a data signal thereof, and a method for generating a deep learning-based compensation model. To implement same, the present invention provides the display apparatus comprising a timing controller having mounted therein the compensation model generated by learning, in a deep learning method, the temperature, time, average brightness, and data voltage for each pixel. Accordingly, the present invention has an effect of preventing burn-in from occurring in each pixel by supplying each pixel with the compensated data voltage generated via the compensation model.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a plurality of gate lines and a plurality of data lines that intersect each other, and a plurality of pixels, each pixel from the plurality of pixels defined at an intersection of a gate line from the plurality of gate lines and a data line from the plurality of data lines;
a gate driver configured to apply a scan signal to the plurality of gate lines;
a data driver configured to apply a data signal to the plurality of data lines; and
a timing controller configured to control the gate driver and the data driver,
wherein the timing controller includes a micro-chip having a compensation model mounted therein, wherein the compensation model is generated by learning a temperature, a weighted time, an average brightness, an applied data signal, and an initial data signal related to each pixel from the plurality of pixels by a deep learning scheme,
wherein the micro-chip is configured to input the data signal to the compensation model to generate a compensated data signal,
wherein the timing controller is configured to apply the generated compensated data signal to the data driver.

2. The display device of claim 1 , wherein the compensation model is generated by a simulator learning the temperature, the weighted time, the average brightness, the applied data signal, and the initial data signal related to each pixel from the plurality of pixels by the deep learning scheme.

3. The display device of claim 2 , wherein the simulator is configured to:
calculate an average brightness of each pixel from the plurality of pixels;
calculate the weighted time using the calculated average brightness;
calculate a threshold voltage shift of a thin-film transistor (TFT) of each pixel from the plurality of pixels using the weighted time;
calculate an electron mobility of the thin-film transistor (TFT) of each pixel from the plurality of pixels using the calculated threshold voltage shift;
calculating the applied data signal and the initial data signal using the threshold voltage shift and the electron mobility; and
set the initial data signal as target data voltage.

4. The display device of claim 3 , wherein the simulator is configured to calculate the weighted time t′ p using a per-pixel driving time t p , a weight ω corresponding to per-pixel time data, and a per-pixel average brightness B p .

5. The display device of claim 4 , wherein the simulator is configured to calculate the weighted time t′ p according to a following Equation:
t′ p t p (1+ω B p )

where t′ p denotes the weighted time, t p denotes the per-pixel driving time, B p denotes the per-pixel average brightness, and ω denotes the weight.

6. The display device of claim 3 , wherein the simulator is configured to calculate the threshold voltage shift ΔV shift according to a following Equation:
ΔV shift t′ p α 1

where ΔV shift denotes the threshold voltage shift, t′ p denotes the weighted time, and α 1 denotes a threshold voltage shift reduction coefficient.

7. The display device of claim 3 , wherein the simulator is configured to calculate the electron mobility μ according to a following Equation:
μ e −α 3 T +ϵ 2

where μ denotes electron mobility, α 3 denotes an electron mobility reduction coefficient, T denotes the temperature, and ϵ 2 denotes an electron mobility noise.

8. The display device of claim 3 , wherein the simulator is configured to calculate the applied data signal V′ d, t p =γ according to a following Equation:

V

d
,

t
p

=
γ

′

=
△

V

D
⁢
D

-

(

1
⁢
0
⁢
0

100
-
α

)

⁢

(

n
l

)

⁢

2
⁢

I
max
′

μ

⁢

C

o
⁢
x

(

W
L

)

-

❘
"\[LeftBracketingBar]"

V

th
,

t
p

=
γ

′

❘
"\[RightBracketingBar]"

+
ϵ

where V′ d, t p =γ denotes the applied data signal (voltage), VDD denotes a drain voltage of the thin-film transistor (TFT), γ represents a data voltage reduction coefficient, n represents a gray level of the thin-film transistor (TFT), l represents a gray level range of the thin-film transistor (TFT), I′ MAX represents a maximum input current of the thin-film transistor, μ (TFT) in consideration of a noise, μ represents the electron mobility, C ox denotes a capacitance per unit area of the thin-film transistor (TFT), L denotes a channel length of the thin-film transistor (TFT), W denotes a channel width of the thin-film transistor (TFT), and ϵ denotes a data voltage noise.

9. The display device of claim 3 , wherein the simulator is configured to calculate the initial data signal V d, t p =0 according to a following Equation:

V

d
,

t
p

=
0

Assignees

• Lg Display Co Ltd
• Univ Hanyang Ind Univ Coop Found

Inventors

• Chang Joon-Hyuk
• Ji Kwanghwan
• Park Kwan-Ho
• Chang Kiseok
• Seo Junghoon
• Hong Kipyo
• Park Hyojung
• Lee Seunghyuck

Classifications

• G06N3/0499

  Feedforward networks · CPC title

• G06N3/09

  Supervised learning · CPC title

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2300/043

  Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver · CPC title

• G09G3/3275

  Details of drivers for data electrodes · CPC title