阅读说明：本技术 通过深色内部堆叠体和外部堆叠体的组合而改进的pdlc车辆玻璃板的视觉印象 (Visual impression of PDLC vehicle glass panels improved by combination of dark inner and outer stacks ) 是由 F.曼茨 M.拉布罗特 J.多罗萨里奥 V.舒尔茨 于 2019-02-04 设计创作，主要内容包括：本发明描述了车辆玻璃板,其以下列次序包括：a)外部玻璃质玻璃板1,b)一个或多个层压层2,c)PDLC层4,其包含聚合物基质9和分别在聚合物基质9的两面上的导电层3、5,在所述聚合物基质中嵌入液晶微滴8,d)一个或多个层压层6,和e)内部玻璃质玻璃板7,其特征在于,TL(内部)为5至46%且TL(外部)为20至73%且TL(外部)大于或等于TL(内部),其中TL(内部)是通过内部玻璃质玻璃板7和在PDLC层4和内部玻璃质玻璃板7之间的层形成的内部堆叠体的透光率,且TL(外部)是通过外部玻璃质玻璃板1和在PDLC层4和外部玻璃质玻璃板1之间的层形成的外部堆叠体的透光率。本发明的车辆玻璃板相对于传统的PDLC玻璃板而言显示出明显改进的视觉效果,其在入射的阳光下具有较少的白色雾纱且在内室看向玻璃板时具有明显更高价的视觉外观。(The invention describes a vehicle glazing panel comprising, in the following order: a) outer vitreous glass pane 1, b) one or more laminate layers 2, c) a PDLC layer 4 comprising a polymer matrix 9 and electrically conductive layers 3, 5 on both sides of the polymer matrix 9, respectively, in which polymer matrix liquid crystal droplets 8 are embedded, d) one or more laminate layers 6, and e) an inner vitreous glass pane 7, characterized in that TL (inner) is 5 to 46% and TL (outer) is 20 to 73% and TL (outer) is greater than or equal to TL (inner), wherein TL (inner) is the light transmittance of the inner stack formed by the inner vitreous glass pane 7 and the layer between PDLC layer 4 and inner vitreous glass pane 7, and TL (outer) is the light transmittance of the outer stack formed by the outer vitreous glass pane 1 and the layer between PDLC layer 4 and outer vitreous glass pane 1. The vehicle glazing of the invention exhibits a significantly improved visual impact relative to conventional PDLC glazing, with less white fogging under incident sunlight and a significantly more expensive visual appearance when the glazing is viewed from the interior.)

1. A vehicle glazing panel comprising, in the following order:

a) An outer vitreous glass plate (1),

b) One or more laminate layers (2),

c) PDLC layer (4) comprising a polymer matrix (9) in which liquid crystal droplets (8) are embedded and electrically conductive layers (3, 5) on both sides of the polymer matrix (9), respectively,

d) One or more laminate layers (6), and

e) An inner vitreous glass plate (7),

Characterized in that TL (inner) is 5 to 46% and TL (outer) is 20 to 73% and TL (outer) is greater than or equal to TL (inner), wherein TL (inner) is the light transmittance of the inner stack formed by the inner vitreous glass plate (7) and the layer between the PDLC layer (4) and the inner vitreous glass plate (7), and TL (outer) is the light transmittance of the outer stack formed by the outer vitreous glass plate (1) and the layer between the PDLC layer (4) and the outer vitreous glass plate (1).

2. Vehicle glazing according to claim 1, wherein the ratio TL (outer)/TL (inner) is from 5 to 1, preferably from 4 to 1.5, more preferably from 3 to 2.

3. Vehicle glazing according to claim 1 or claim 2, wherein TL (inner) is from 7 to 28% and/or TL (outer) is from 24 to 40%.

4. Vehicle glazing panel according to any of claims 1 to 3, wherein a protective layer (11, 12) is arranged on each side of the PDLC layer (4), wherein both protective layers are preferably polyethylene terephthalate layers.

5. vehicle glazing panel according to any of the preceding claims, wherein at least two laminate layers (2) are comprised between the outer vitreous glass panel (1) and the PDLC layer (4), and an IR reflecting layer (13) made of a carrier layer, preferably a polyethylene terephthalate layer, and an IR reflecting coating layer thereon is arranged between the two laminate layers (2).

6. Vehicle glazing according to any of the preceding claims, wherein the inner (7) and/or outer (1) vitreous glazing has a low-emissivity coating, wherein preferably only the inner (7) vitreous glazing has a low-emissivity coating.

7. Vehicle glazing panel according to any of the preceding claims, wherein the laminate layer (2, 6) comprises polyvinyl butyral (PVB), ethylene vinyl acetate, polyurethane and/or mixtures thereof, wherein the PVB layer is preferred.

8. Vehicle glazing panel according to any of the preceding claims, wherein at least one of the laminate layers (2, 6) is a coloured laminate layer, in particular a coloured PVB layer, wherein the coloured laminate layer is preferably a grey laminate layer.

9. Vehicle glazing according to any of the preceding claims, wherein the inner (7) and/or outer (1) vitreous glazing is selected from tinted vitreous glazing, wherein the tinted vitreous glazing is preferably a grey or dark grey vitreous glazing.

10. Vehicle glazing according to any of the preceding claims, wherein

The inner vitreous glass pane (7) is a tinted vitreous glass pane and the outer vitreous glass pane (1) is a clear vitreous glass pane, or

The inner vitreous glass pane (7) is a coloured vitreous glass pane and the outer vitreous glass pane (1) is a coloured vitreous glass pane, wherein the coloured vitreous glass pane is preferably a grey or dark grey vitreous glass pane.

11. Vehicle glazing according to any of the preceding claims, wherein the light transmission TL (total) of the entire vehicle glazing is less than or equal to 30%, preferably less than 20%, preferably less than 10% in the open mode.

12. Vehicle glazing according to any of the preceding claims, wherein the vehicle glazing is an automotive glazing.

13. Vehicle glazing according to any of the preceding claims, wherein the vehicle glazing is a sunroof glazing, a glass roof, a rear glazing, a rear side glazing or a front side glazing, preferably in an automobile.

14. Vehicle comprising a vehicle glazing according to any of claims 1 to 13, wherein the vehicle is preferably an automotive vehicle.

Examples

the optical properties of seven inventive vehicle glazing panels a-G and two non-inventive vehicle glazing panels H and I as references were investigated. In all examples, the same PDLC film and two PET protective films disposed thereon were used. The following lists the assembly of vehicle glazing panels, with the sequence shown corresponding to the structure from the exterior (exterior glazing panel) to the interior (interior glazing panel):

Vehicle glass board A (2x VG10)

Dark grey glass/clear PVB/PDLC/clear PVB/dark grey glass

Vehicle glass board B (2x VG10, Comfortsky!)

Dark grey glass/clear PVB/PDLC/clear PVB/dark grey glass + low emissivity coating (Comfortsky)

Vehicle glass plate C (PET IRR)

Clear glass/clear PVB/PET with IR-reflecting coating/Gray PVB/PET protective layer/PDLC/PET protective layer/clear PVB/dark Gray glass

Vehicle glass plate D (PET IRR HPS)

Clear glass/clear PVB/PET/Gray PVB/PET protective layer/PDLC/PET protective layer/clear PVB/dark Gray glass with a strongly IR-reflecting coating

Vehicle glazing E (HPS +2x deep (dark))

Clear glass/clear PVB/PET/Gray PVB/PET protective layer/PDLC/PET protective layer/Gray PVB/dark Gray glass with a strongly IR-reflecting coating

Vehicle glass F (HPS, 2x d Comfortsky!)

Clear glass/clear PVB/PET/grey PVB/PET protective layer with strong IR reflective coating/PDLC/PET protective layer/grey PVB/dark grey glass + Low emissivity (Comfortsky)

)Vehicle glass plate G (2x PLC, 2x d)

Clear glass/dark PVB/PET protective layer/PDLC/PET protective layer/dark PVB/clear glass (dark PVB in the inner stack is deeper than dark PVB in the outer stack)

)Vehicle glass board H (2x PLC, 1x d)

Clear glass/dark PVB/PET protective layer/PDLC/PET protective layer/clear PVB/clear glass (this structure provides good thermal comfort)

)Vehicle glass plate I (2x PLC)

Clear glass/clear PVB/PET protective layer/PDLC/PET protective layer/clear PVB/clear glass (standard construction of partition wall glass panes in motor vehicles)

For the vehicle glass panels a to G and the reference glass panels H and I, TL (inside), TL (outside), TL (inside), and TL (outside)/TL (inside) ratios in the on mode (transparent mode of the PDLC layer) of the transmittance were determined. The results are shown in the following table.

Watch (A)

numbering	Glass plate	TL (total) [% ]	TL (exterior) [% ]	TL (inner) [% ]	TL (outside)/TL (inside)
						A	2x VG10	7.4	28	28	1.0
B	2x VG10, Comfortsky	7.2	28	27.4	1.0
						C	PET IRR	6	22.9	8.7	2.6
D	PET IRR HPS	6.1	23.2	8.7	2.7
						E	HPS,2X deep	1.9	23.2	8.7	2.7
F	HPS, 2x d, Comfortsky	1.9	23.2	8.5	2.7
						G	2x PLC, 2x d	30	72.9	45.7	1.6
H*	2x PLC, 1x d	7.6	9.3	90.5	0.1
						I*	2x PLC	74.4	90.8	90.8	1.0

Reference glass plate.

The haze of the conventional top glass plate was < 1%, which was increased to < 3% by using dark PVB. By using PDLCs, an opaque light source is obtained which both uniformly illuminates the vehicle interior and prevents passengers from being dazzled. Once the white PDLC film is illuminated by a light source, such as the sun, the PDLC scatters it. If this white scattered light is observed as passengers, a poor "plastic" visual impression is obtained.

When observing the same PDLC film with the darker interior stack of the present invention and the same light ratio, a superior impression of a strong gray color was observed in the vehicle glazing panel of the present invention compared to the reference glazing panels H and I.

The conventional PDLC film has a haze of 2% to 16% in a transparent state. For use in vehicles, films with low haze are generally desirable. The dark colored polymer laminate layer also increases the haze value. Thus, the complete structure may have a haze of up to 10%. Thus, the haze is greatly increased when compared directly to a light colored glass pane (e.g., having a TL of 70% as in the case of reference glass pane I), but the product of the invention is more visually appealing.

Another difference is produced when an externally located light source is illuminated on the glass sheet. In the case of conventional glass plates, the light is uniformly scattered, in particular, for example, sunlight is scattered, so that only a very small portion is deflected into the eyes of the observer. The outward line of sight is only slightly disturbed by this light.

When using PDLC glass panels, sunlight is scattered depending on direction. If the viewing angle is shifted away from the direction of radiation, the intensity of the scattered light is reduced in principle. However, there is a colored "halo" which is the maximum in intensity in the scattered light distribution depending on the viewing angle. After this color phenomenon, intense white scattered light is observed, which is attenuated only at considerable angles.

Especially in such strongly white light scattering areas, the observation of objects through PDLC glass plates with conventional structures is significantly disturbed. The intensity of the scattered light may exceed the light intensity of the object, whereby the color of the object appears dull due to the white scattered light (white fog yarn).

In the case of the glass structure according to the invention with a dark inner layer, the intensity of scattered light is particularly reduced. The color of the object can also be identified when viewed. Despite the higher haze and optionally darker overall structure in the case of the inventive vehicle glazing unit, the object appears clearer than in the case of the reference glazing units H and I.

In the case of the inventive vehicle glazing, in the case of the glazing panels a to F, in particular in the case of the glazing panels C to F, the best overall visual impression or the greatest reduction in the impression of white fogged yarns and "plastics" is obtained.

List of reference numerals

1 external vitreous glass plate

2 laminated layer

3 conductive layer

4 PDLC layer

5 conductive layer

6 laminated layer

7 internal vitreous glass plate

8 liquid crystal droplets

9 Polymer matrix

10 incident light

10' scattered light

11 protective layer

12 protective layer

13 IR reflecting layer

14 frame

S switch (Circuit open)

S' switch (closed circuit)

And a V voltage source.