CN1100204A - Torsional nematic liquid crystal display device - Google Patents
Torsional nematic liquid crystal display device Download PDFInfo
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- CN1100204A CN1100204A CN 93117452 CN93117452A CN1100204A CN 1100204 A CN1100204 A CN 1100204A CN 93117452 CN93117452 CN 93117452 CN 93117452 A CN93117452 A CN 93117452A CN 1100204 A CN1100204 A CN 1100204A
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- liquid crystal
- display device
- crystal display
- angle
- polaroid
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Abstract
A method for obtaining high multi-channel drive capacity by changing the included angle between polarizing optical axes of front and back polarizers is disclosed. The LCD device made based on said method features simple technology, low cost, and high multi-channel drive capacity.
Description
The invention belongs to liquid crystal display device.
Characteristics such as liquid crystal display device is little with its volume, and is low in energy consumption, and driving voltage is low are subjected to people and extensively pay attention to.Be display performance and the raising multichannel driving force of improving liquid crystal display device, new display mode constantly occurs, as TN-LCD, and STN-LCD, AM-LCD, ECB-LCD etc.TN-LCD[74-J7247V/43 DE2415809-A] the steepness of electro-optical characteristic curves low, general γ=V
90/ V
10〉=1.3, according to formula N=((γ
2+ 1)/(γ
2-1))
2, underswept is in 16 row, and is quite limited by changing liquid crystal parameter raising multichannel driving force.STN-LCD[84-141049/23 DE3243664-A] can improve driving force greatly by the twist angle that changes liquid crystal layer, but bring a series of unsurmountable shortcomings thus: (1) display device thickness requirement harshness, bring sizable difficulty to technological process; (2) owing to utilize the birefringence displaying principle, image has inherent colour, and the beholder does not take like a shot; (3) response speed is slow, and the response time surpasses 100ms usually, is not suitable for the show events image.AM-LCD then is on the basis of TN device, adds resistance change element [80-7153 9C/40 US4223308-A] or gating switch for each pixel, and low yield rate and expensive cost have limited the development of AM-LCD.ECB-LCD[M.F.Schielkel and K.Fahrenschon, Appl.Phys.Lett.19,391(1971)] then, its serious look is difficult to realize white and black displays that the instability of color has more limited the commercialization of ECB-LCD because of separating.
The objective of the invention is to improve the multichannel driving force of traditional TN liquid crystal display device by the angle between the two polaroid polarizing axis before and after changing.
For realizing this purpose, the present invention adopts following technical scheme:
The preparation twist angle is 80 °～100 ° a TN type liquid crystal display device, when pasting polaroid, making the angle between the frictional direction of the polarizing axis of a side polaroid wherein and this side group plate is-10 °～+ 10 ° or 80 °～100 °, and the angle between the opposite side polaroid polarizing axis is θ-45 °～θ-5 °, to obtain promptly to improve the multichannel driving force than traditional higher steepness of TN type liquid crystal display device.This be because, to TN type liquid crystal display device (is example with twist angle=90), make the angle of linear polarization polarization surface rotation and relation such as the accompanying drawing 1[M.Schadt and W.Helfrich of impressed voltage V, Appl.Phys.Lett.Vol.18,127-128(1971)], traditional TN type liquid crystal display device, the angle between the two polaroid polarizing axis of front and back is 90 ° (or 0 °), corresponding threshold voltage is V
Th, saturation voltage is V
1, when the angle of two polaroid polarizing axis during at θ-45 °～θ-5 °, the minimum pairing voltage V of transmitance
2Less than V
1, promptly the saturation voltage of Novel LCD spare reduces, and threshold voltage unchanged causes γ=V
90/ V
10Reduce, thereby reach the effect that improves the multichannel driving force.
The invention has the advantages that:
(1) novel TN type liquid crystal display device has very strong multichannel driving force, and sweep trace can reach 200 row;
(2) display device thickness requirement and TN type liquid crystal display device are just the same, and be all low than the liquid crystal display device requirement of other pattern, realizes easily on the technology;
(3) display mode is a black and white, has avoided compensate for process loaded down with trivial details among the STN-LCD, has a desirable white-black pattern;
(4) response speed of display device is fast, can be used for dynamic demonstration.
Now the present invention is described in further detail in conjunction with the accompanying drawings and embodiments.
Shown in Figure 1 is by the linear polarization polarization surface of 90 ° of twisted liquid crystal layers and the relation of impressed voltage.The longitudinal axis is the angle between emergent light plane of polarization and incident light polarization face, and transverse axis is an impressed voltage;
Shown in Figure 2 is the polaroid placement orientation synoptic diagram of liquid crystal display device of the present invention.P
1And P
2Be respectively the polarizing axis direction of two polaroids, R
1And R
2Be respectively the frictional direction of two substrates, θ is the twist angle of liquid crystal layer, P
1P
2It is the angle between the two polaroid polarizing axis.
Embodiment one, preparation thickness are that 7.5 μ m twist angle are 90 ° liquid crystal display device, inject the TN type liquid crystal CP-9001 that Japanese Chisso company provides, and angle is 65 o'clock between the polaroid polarizing axis, γ=1.15, and the multichannel driving force can reach 50 row; Angle is 45 ° between the change polaroid polarizing axis, γ=1.09, and sweep trace can reach 130 row.
Embodiment two, preparation thickness are that 6.0 μ m twist angles are 90 ° liquid crystal display device, inject the TN type liquid crystal TN594 that Polish College of Military Engineering provides, when angle is 65 ° between the polaroid polarizing axis, γ=1.13 o'clock, can drive 64 row, angle is 45 ° between the polaroid polarizing axis, γ=1.08, and sweep trace can reach 170 row.
Claims (2)
1, a kind of TN type liquid crystal display device, obtain high multichannel driving force by the angle between the polaroid polarizing axis before and after changing, the twist angle of liquid crystal display device is 80 °～100 °, it is characterized in that, the angle of polaroid polarizing axis is less than twist angle, is θ-45 °～θ-5 °; Wherein the angle between the polarizing axis of a side polaroid and this side group plate frictional direction is-10 °～+ 10 °;
2, liquid crystal display device according to claim 1 is characterized in that wherein the polarizing axis of a side polaroid and the angle between this side group plate frictional direction are 80 °～100 °, and the angle between the polarizing axis of opposite side polaroid is θ-45 °～θ-5 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93117452 CN1100204A (en) | 1993-09-10 | 1993-09-10 | Torsional nematic liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93117452 CN1100204A (en) | 1993-09-10 | 1993-09-10 | Torsional nematic liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1100204A true CN1100204A (en) | 1995-03-15 |
Family
ID=4992009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93117452 Pending CN1100204A (en) | 1993-09-10 | 1993-09-10 | Torsional nematic liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1100204A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102402041A (en) * | 2010-09-16 | 2012-04-04 | 三菱电机株式会社 | Liquid crystal display apparatus |
-
1993
- 1993-09-10 CN CN 93117452 patent/CN1100204A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102402041A (en) * | 2010-09-16 | 2012-04-04 | 三菱电机株式会社 | Liquid crystal display apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |