CN2802546Y

CN2802546Y - Liquid crystal display device

Info

Publication number: CN2802546Y
Application number: CN 200520110512
Authority: CN
Inventors: 蔡佳静; 廖文瑞; 胡中惠
Original assignee: Wintek Corp
Current assignee: Wintek Corp
Priority date: 2005-06-28
Filing date: 2005-06-28
Publication date: 2006-08-02
Anticipated expiration: 2015-06-28

Abstract

The utility model discloses a liquid crystal display device, which rotates the deflection angles of a lower polarizer and an upper polarizer which are combined with the light incident surface and the light exit surface of a liquid crystal unit, so that the emergent light axis and the incident light axis of the liquid crystal unit do not overlap with the penetration axis of the upper and lower polarizers, and the included angles between the penetration axis of the upper and lower polarizers and the emergent light axis and the incident light axis of the liquid crystal unit are respectively within the range of -45° to 45°, so as to change the phase difference value of the liquid crystal unit, so that the light source generates different degrees of light leakage after refraction, thereby causing the presentation of different background color contrasts.

Description

Liquid crystal indicator

Technical field

The utility model relates to a kind of liquid crystal indicator, refer to especially a kind of by changing the phasic difference value of polaroid and liquid crystal cells, change the liquid crystal indicator background color liquid crystal indicator.

Background technology

Traditional TN-MODEL (stable twisted nematic) LCD can only manifest two kinds of colors of B﹠W usually, and its display effect is very dull.Therefore industry has following three kinds of common methods to change the color of TN-MODEL LCD.

As shown in Figure 3, first method is: add dichroic dye in liquid crystal layer 71, and use white backlight assembly 72.By with liquid crystal layer dyeing, make liquid crystal layer be driven or not driven state under, manifest different colors.But this kind mode has certain difficulty on making, and cost of manufacture is higher; And, add physical characteristics and the chemical characteristic that dyestuff can influence liquid crystal layer itself in the chemosynthesis mode, and then influence the original photoelectricity effect of liquid crystal layer.

As shown in Figure 4, second method is: add a colored filter 83 between liquid crystal layer 81 and white backlight assembly 82, make the background color of liquid crystal indicator be transformed into white color in addition.But this kind method can make backlight liquid crystal display brightness reduce, and is difficult to control the effect of colour generation, especially drives byte and is still and does not penetrate the shown black of light, and can't be applicable to reflective liquid crystal indicator.

As shown in Figure 5, the third method is: with the backlight assembly 92 of the different colours liquid crystal layer 91 of arranging in pairs or groups, utilize the backlight assembly 92 of the different colours that different wave length presents to change the background color of the viewing area that does not drive, but the driving byte is still and does not penetrate the shown black of light, so, it is to when colour generation is limited, and the colour mixture effect is difficult to control, also can't be applicable to reflective liquid crystal indicator.

In view of the above, aforesaid three kinds of methods, though can change the color of TN-MODEL LCD, but still have different shortcomings, improved necessity is in addition arranged.

Summary of the invention

In view of the foregoing, fundamental purpose of the present utility model provides a kind of by changing the phasic difference value of polaroid and liquid crystal cells, changes the liquid crystal indicator of liquid crystal indicator background color.

Another purpose of the present utility model provide a kind of simple in structure, make easy, with low cost and have the diversified liquid crystal indicator of form and aspect.

For achieving the above object, the utility model is taked following design proposal: a kind of liquid crystal indicator, and it comprises:

One liquid crystal cells, this liquid crystal cells have an incidence surface and one with its mutual corresponding exiting surface, incidence surface and exiting surface respectively orientation be formed with an incident light axis to an emergent light axis to;

Polaroid on the polaroid and once, wherein, one of them combines following polaroid and incidence surface or exiting surface, and last polaroid combines with remaining exiting surface or incidence surface; It is characterized in that:

Have at least one to be thin epitaxial polaroid in the described upper and lower polaroid, and upper and lower polaroid have respectively a penetrating shaft to;

The emergent light axis of described liquid crystal cells to incident light axis to not with the axial overlap that penetrates of upper and lower polaroid, and the penetrating shaft of upper and lower polaroid to respectively and the emergent light axis of liquid crystal cells to and incident light axis to angle circle between one 45 °～45 °.

The utility model is by thin epitaxial (thin crystal film:TCF) polaroid with polarized light property, utilize to change the polarisation penetrating shaft to the angle of the alignment direction of the going into of liquid crystal cells, exiting surface, allow the TN-MODEL LCD that has optical activity originally mix the birefringence effect, to change the phasic difference value of liquid crystal cells, make the white backlight source after refraction, make different wave length generation light leak in various degree, and then cause presenting of different background color contrasts, reach the purpose of the color that changes the TN-MODEL LCD.

The utility model is simple in structure, making is easy, with low cost and have a diversified advantage of form and aspect.

Description of drawings

Fig. 1 is a structural representation of the present utility model

Fig. 2 is the penetrance performance diagram of the utility model polaroid

Fig. 3 is traditional structural representation that adds the LCD of dichroic dye in liquid crystal layer

Fig. 4 is the structural representation of traditional LCD with colored filter

Fig. 5 is the structural representation of traditional LCD of forming with the backlight assembly collocation liquid crystal layer of different colours

Embodiment

As shown in Figure 1, the disclosed liquid crystal indicator of the utility model comprises a liquid crystal cells 1, in the present embodiment, phasic difference value scope circle of this liquid crystal cells 1 is between 500nm～1200nm, this liquid crystal cells 1 has an incidence surface 11 and an exiting surface 12 respectively, and this incidence surface 11 and exiting surface 12 are combined with polaroid 22 on the polaroid 21 and respectively.In the present embodiment, have at least one to be thin epitaxial (the thin crystal film:TCF) polaroid with polarized light property in this upper and lower polaroid, its penetrance family curve as shown in Figure 2.The incidence surface 11 of this liquid crystal cells 1 and exiting surface 12 respectively orientations (Rubbing) be formed with an incident light axis to A and an emergent light axis to B, and this upper and

lower polaroid

22,21 has a penetrating shaft respectively to 22B, 21A.The emergent light axis of this liquid crystal cells 1 is not overlapping to 22B, 21A with the penetrating shaft of upper and lower polaroid to A to B and incident light axis, and the penetrating shaft of this upper and lower polaroid to 22B, 21A respectively and the emergent light axis of liquid crystal cells to B and incident light axis to angle circle of A between-45 °～45 °.

In the conventional art viewpoint, the emergent light axis of liquid crystal cells must be overlapping to 22B, 21A with the penetrating shaft of upper and lower polaroid to A to B and incident light axis, can reach display effect.But, the inventor finds through experiment, change upper and lower polaroid penetrating shaft to go out with liquid crystal cells, incident light axis to, can change the phasic difference value of liquid crystal cells, make light source after reflecting, produce in various degree light leak, and then cause presenting of different background colors contrasts.Wherein, with the penetrating shaft of last polaroid 22 to the emergent light axis of 22B and liquid crystal cells to B deflection one angle, can change the byte color that drives when showing; And the penetrating shaft that will descend polaroid 21 is gone into optical axis direction A deflection one angle to 21A and liquid crystal display 1, can change the color of liquid crystal indicator background color, especially thin epitaxial (TCF) polaroid partly has the higher penetrating rate the short wavelength, be easy to arrange in pairs or groups out and be different from the color of general polaroid, thus, just can more easily reach the purpose that changes TN-MODEL LCD color.

For example: when phasic difference value scope circle of liquid crystal cells 1 between 800nm～1200nm, the penetrating shaft of last polaroid 22 is 45 ° to emergent light axis angle between B of 22B and liquid crystal cells, this moment, the background color of liquid crystal indicator can take on a red color, and was white in color and drive the byte that shows.

When phasic difference value scope circle of liquid crystal cells 1 between 800nm～1200nm, the penetrating shaft of following polaroid 21 is-45 ° to the angle of going between optical axis direction A of 21A and liquid crystal display 1, this moment, the background color of liquid crystal indicator was green, drove the byte that shows and was blue.

When phasic difference value scope circle of liquid crystal cells 1 between 400nm～650nm, and the penetrating shaft of going up polaroid 22 is 45 ° to emergent light axis angle between B of 22B and liquid crystal cells, this moment, the background color of liquid crystal indicator was blue, the byte that drives demonstration is white in color.

When phasic difference value scope circle of liquid crystal cells 1 between 400nm～650nm, the penetrating shaft of following polaroid 21 is-45 ° to the angle of going between optical axis direction A of 21A and liquid crystal display 1, this moment, the background color of liquid crystal indicator was yellow, drove the byte that shows and was black.

Hence one can see that, the utility model by change upper and lower polaroid penetrating shaft to the angle of orientation (Rubbing) direction of the going into of liquid crystal cells, exiting surface, the effect that the TN-MODEL LCD that allows script have optical activity is mixed birefringence (Birefringence), to change the phasic difference value of liquid crystal cells, make the white backlight source after refraction, make different wave length generation light leak in various degree, and then cause presenting of different background color contrasts, reach the purpose that changes TN-MODEL LCD color.

Structure of the present utility model is equally applicable to reflective liquid crystal indicator, and the very easy making of structure of the present utility model and with low cost, and has the diversified characteristics of form and aspect.In addition, the polaroid that the utility model adopts except that can having aforesaid form, the polaroid that also can adopt sticking type or form in the mode that is coated with.

Claims

1. A liquid crystal display device comprising:

A liquid crystal unit, the liquid crystal unit has a light incident surface and a light exit surface corresponding thereto, the light incident surface and the light exit surface are respectively aligned to form an incident light axis and an exit light axis;

A lower polarizer and an upper polarizer, wherein the lower polarizer is combined with one of the light incident surface or the light exit surface, and the upper polarizer is combined with the remaining light exit surface or light incident surface; it is characterized in that:

At least one of the upper and lower polarizers is a thin crystal film polarizer, and the upper and lower polarizers respectively have a penetration axis;

The outgoing light axis and the incident light axis of the liquid crystal unit do not overlap with the transmission axes of the upper and lower polarizers, and the transmission axes of the upper and lower polarizers are respectively aligned with the exit light axis and the incident light axis of the liquid crystal unit. The included angle of the optical axis is between -45° and 45°.

2. The liquid crystal display device according to claim 1, wherein the phase difference of the liquid crystal unit ranges from 500nm to 1200nm.

3. The liquid crystal display device according to claim 1, wherein the thin crystal film polarizer is an externally attached polarizer.

4. The liquid crystal display device according to claim 1, wherein the thin crystal film polarizer is a polarizing film formed by coating.