Liquid display panel and method for detecting electric potential generated by ions between liquid crystal layer and alignment film

Patent metadata

Field	Value
Publication number	US-9824613-B2
Application number	US-201514821843-A
Country	US
Kind code	B2
Filing date	Aug 10, 2015
Priority date	Sep 19, 2014
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A liquid display panel is disclosed, which comprises: a first substrate; a second substrate; a first electrode and a second electrode disposed between the first substrate and the second substrate, wherein the first electrode and the second electrode have different electric potentials; a first alignment film disposed between the first electrode and the second electrode; and a liquid crystal layer disposed between the first substrate and the second substrate, wherein when a working frequency of the liquid crystal display panel is N Hz, ionic electric potentials of the liquid crystal layer and the first alignment film satisfy the following Equation (I):

0
≤



V
ion_LC

⁡

(

1

2
⁢
N

)

-

V
ion_PI

⁡

(

1

2
⁢
N

)

V
ion_LC

⁡

(

1

2
⁢
N

)

+

V
ion_PI

⁡

(

1

2
⁢
N

)



≤
0.5

(
I
)

wherein 0.1≦N≦30, V ion _ LC (1/2N) refers to an ionic electric potential of the liquid crystal layer at a time of 1/2N, and V ion _ PI (1/2N) refers to an ionic electric potential of the first alignment film at a time of 1/2N.

First claim

What is claimed is:

1. A liquid display panel, comprising:
a first substrate;
a second substrate disposed opposite to the first substrate;
a first electrode disposed between the first substrate and the second substrate;
a second electrode disposed between the first substrate and the second substrate, wherein the first electrode and the second electrode have different electric potentials;
a first alignment film disposed between the first electrode and the second electrode; and
a liquid crystal layer disposed between the first substrate and the second substrate,
wherein when a working frequency of the liquid crystal display panel is N Hz, ionic electric potentials of the liquid crystal layer and the first alignment film satisfy the following Equation (I):

0
≤



V
ion_LC

⁡

(

1

2
⁢
N

)

-

V
ion_PI

⁡

(

1

2
⁢
N

)

V
ion_LC

⁡

(

1

2
⁢
N

)

+

V
ion_PI

⁡

(

1

2
⁢
N

)



≤
0.5

(
I
)

wherein 0.1≦N≦30, V ion _ LC (1/2N) refers to an ionic electric potential of the liquid crystal layer at a time of 1/2N, and V ion _ PI (1/2N) refers to an ionic electric potential of the first alignment film at a time of 1/2N.

2. The liquid crystal display panel of claim 1 , wherein the first electrode and the second electrode are disposed on the first substrate.

3. The liquid crystal display panel of claim 1 , wherein the first electrode is disposed on the first substrate, and the second electrode is disposed on the second substrate.

4. The liquid crystal display panel of claim 1 , further comprising a second alignment film disposed between the first electrode and the second electrode and opposite to the first alignment film, and the liquid crystal layer is disposed between the first alignment film and the second alignment film.

5. A method for detecting an electric potential generated by ions between a liquid crystal layer and an alignment film in a liquid crystal display panel, comprising the following steps:
providing a liquid crystal display panel, comprising: a first substrate; a second substrate disposed opposite to the first substrate; a first electrode disposed between the first substrate and the second substrate; a second electrode disposed between the first substrate and the second substrate, wherein the first electrode and the second electrode have different electric potentials; a first alignment film disposed between the first electrode and the second electrode; and a liquid crystal layer disposed between the first substrate and the second substrate;
measuring the liquid crystal display panel by a liquid crystal current measurement method, to obtain a sum A of an ionic electric potential of the liquid crystal layer at a time of 1/2N and an ionic electric potential of the first alignment film at the time of 1/2N, as shown in the following Equation (1); and measuring the liquid crystal display panel by a phase difference measurement method, to obtain a difference B between the ionic electric potential of the liquid crystal layer at the time of 1/2N and the ionic electric potential of the first alignment film at the time of 1/2N, as shown in the following Equation (2):
A =V ion _ PI (1/2N) +V ion _ LC (1/2N)  (1)

B =V ion _ PI (1/2N) −V ion _ LC (1/2N)  (2)

wherein 0.1≦N≦30, V ion _ LC (1/2N) refers to the ionic electric potential of the liquid crystal layer at the time of 1/2N, and V ion _ PI (1/2N) refers to the ionic electric potential of the first alignment film at the time of 1/2N; and
obtaining the ionic electric potential of the first alignment film at the time of 1/2N and the ionic electric potential of the liquid crystal layer at the time of 1/2N via the following Equation (3) and Equation (4):
V ion _ PI (1/2N)=( A+B )/2  (3)

V ion _ LC (1/2N)=( A−B )/2  (4)

wherein when a working frequency of the liquid crystal display panel is N Hz, the ionic electric potentials of the liquid crystal layer and the first alignment film satisfy the following Equation (I):

0
≤



V

ion
⁢
_
⁢
LC

⁡

(

Assignees

• Innolux Corp

Inventors

• Yang Kei-Hsiung
• Hsu Hsu-Kuan

Classifications

• G02F2203/69

  Arrangements or methods for testing or calibrating a device · CPC title

• G02F1/1337

  Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers · CPC title

• G02F1/13306

  Circuit arrangements or driving methods for the control of single liquid crystal cells (G02F1/132, G02F1/133382 take precedence) · CPC title

• G02F1/1309 Primary

  Repairing; Testing · CPC title

• G09G3/006 Primary

  Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309) · CPC title