System for evaluating displaying quality of transparent display and method thereof

Patent metadata

Field	Value
Publication number	US-9709495-B2
Application number	US-201414586496-A
Country	US
Kind code	B2
Filing date	Dec 30, 2014
Priority date	Apr 29, 2014
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A system for evaluating a quality of a transparent display, the system including: a background including any one of a full white pattern, a full black pattern, and a circle white pattern; a light detector positioned a first distance away from the background to measure luminance of the full white pattern, the full black pattern and the circle white pattern; and a circle transparent pattern displayed on the transparent display by passing light from at least one of the full white pattern, the full black pattern and the circle white pattern, further the transparent display is positioned between the background and the light detector and at a second distance away from the light detector, further a purity of the transparent display is calculated based on luminance of the full white pattern, the full black pattern, and the circle white pattern as measured by the light detector through the transparent display.

First claim

What is claimed is:

1. A system for evaluating a quality of a transparent display, the system comprising:
a background including any one of a full white pattern, a full black pattern, and a circle white pattern;
a light detector positioned a first distance away from the background and configured to measure luminance of the full white pattern, the full black pattern and the circle white pattern; and
a circle transparent pattern displayed on the transparent display by passing light from at least one of the full white pattern, the full black pattern and the circle white pattern, wherein the transparent display is positioned between the background and the light detector and at a position with a second distance away from the light detector,
wherein a purity of the transparent display is calculated by the following equation 1:

Purity
⁡

(
%
)

=

L
CW

-

L
FK

L
FW

-

L
FK

×
100

(

Equation
⁢

⁢
1

)

and wherein L FW is a full white luminance of the full white pattern, L FK is a full black luminance of the full black pattern, and L CW is a circle white luminance of the circle white pattern as measured by the light detector through the transparent display, respectively.

2. The system according to claim 1 , wherein the first distance is 1.5 m and the second distance is 0.5 m.

3. The system according to claim 1 , wherein the circle white pattern includes a circle pattern having a first diameter and a full white level, and an ambient surrounding the circle pattern and having a full black level, and
wherein the first diameter corresponds to a 0.2° height based on a point 1.5 m away from the light detector.

4. The system according to claim 1 , wherein the circle transparent pattern includes a circle pattern having a maximum white level of the transparent display and an ambient surrounding the circle pattern having a maximum black level of the transparent display, and
wherein a diameter of the circle pattern corresponds to a 0.2° height based on a point 1.5 m away from the light detector, and covers an area including at least 500 pixels of the transparent display.

5. The system according to claim 1 , wherein a shape and a size of the circle white pattern and a receiving lens of the light detector are the same, and
a center of the circle white pattern, a center of the circle transparent pattern, and a center of the receiving lens are aligned in a straight line.

6. The system according to claim 1 , wherein the background further represents a circle black pattern,
wherein the light detector is configured to measure a luminance of the circle black pattern passing through the circle transparent pattern displayed on the transparent display, and
wherein a criteria of the purity is calculated by the following equation:

Criteria
=



L
FW

-

L
CW



-



L
FK

-

L
CK





L
FW

-

L
CW



×
100

≤

2
⁢

(
%
)

wherein L FW is the full white luminance, L FK is the full black luminance, L CW is the circle white luminance, and L CK is the circle black luminance.

7. The system according to claim 6 , wherein the circle black pattern includes a circle pattern with a full black level having a first diameter and an ambient with a full white level, and
wherein the first diameter corresponds to a 0.2° height based on a point 1.5 m away from the light detector.

8. The system according to the claim 1 , wherein the light detector is further configured to measure a reference full white luminance of the full white pattern, a reference full black luminance of the full black pattern and a reference circle white luminance of the circle white pattern, without the transparent display being positioned between the light detector and the background,
wherein a reference purity is calculated by following equation 2:

P
ref

=

L

CW
,

w
/
o

-

L

FK

Assignees

• Lg Display Co Ltd

Inventors

• Kim Jaehong
• Lee Dongyou
• Lim Moojong
• Lim Kyongho
• Shin Hongseop
• Park Sunhee

Classifications

• G01N21/59 Primary

  Transmissivity (G01N21/25 takes precedence) · CPC title

• G01N2021/9513

  Liquid crystal panels · CPC title

• G01N21/95

  characterised by the material or shape of the object to be examined (G01N21/89 - G01N21/91, G01N21/94 take precedence) · CPC title