CN113467125A - Liquid crystal display device with a light guide plate - Google Patents
Liquid crystal display device with a light guide plate Download PDFInfo
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
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- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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Abstract
The present invention provides a liquid crystal display, comprising: the liquid crystal display device comprises a liquid crystal display panel and a color improving film arranged on a light-emitting surface of the liquid crystal display panel. The color improving film includes: the micro-prism structure comprises a substrate, a strip-shaped micro-prism layer and a filling and leveling layer. The strip-shaped micro prism layer is provided with a plurality of strip-shaped micro prisms arranged along a first direction, any one strip-shaped micro prism is provided with at least one light guide inclined plane, and an included angle is formed between the light guide inclined plane and the normal direction of the film surface of the color improving film on the section perpendicular to the first direction. The strip-shaped micro prism layer has a first refractive index n1, the filling layer has a second refractive index n2, and the second refractive index n2 is greater than the first refractive index n 1. The liquid crystal display can improve the problem of side view character deviation without influencing the display quality of a front view angle.
Description
Technical Field
The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display having a color improving film to improve color deviation and color saturation reduction of a side view image.
Background
With the trend of larger size of lcd, especially for tv or tiled display wall, even if the user watches a plurality of lcds at front viewing angle, the color appearance of the edge screen of the large lcd is not consistent with that of the center screen, and the overall color deviation is more serious no matter when the user watches at side viewing angle. Although the conventional liquid crystal display has excellent viewing angle characteristics, so that a user can view a displayed image in each viewing angle range, the vertical backlight and the oblique backlight have different optical paths when passing through the liquid crystal layer of the liquid crystal display because the liquid crystal molecules have different symmetries in different viewing angles. Therefore, the image generated by the oblique backlight of the lcd generally cannot have the better image quality as the image generated by the vertical backlight, and is particularly prone to have a white (color washout) phenomenon, a gray-scale inversion (gray-scale inversion) phenomenon or a color deviation at a side viewing angle, so that the image has a lower contrast or an abnormal color expression.
In addition, since the gray scale change from the bright state to the dark state is not linear, in the conventional technique, various standard Gamma curves such as Gamma 2.2 and Gamma 1.8 are usually added to the driving method to correct the relationship between the input voltage and the display brightness gradation, so that the human eye can approach to linear expression when recognizing each gray scale, but this method cannot achieve the correction effect for each viewing angle, and the above-mentioned method of adding the standard Gamma curve only corrects and compensates for the change degree of the bright and dark gray scales at the right viewing angle or the gray scale inversion phenomenon, so that the color consistency of the display image at the right viewing angle and the side viewing angle cannot be improved, because the bright white picture is formed by mixing the light of different color sub-pixels, for example, the common liquid crystal display is formed by mixing the red, green and blue light lines generated after the white backlight source passes through the red, green and blue sub-pixels into white light again, even if the light intensity in each gray scale state can be adjusted to be a consistent variation trend, the red, green and blue sub-pixel light used for mixing white light can still change the mixing intensity ratio due to the change of the visual angle after passing through the liquid crystal molecules, so that the color can still generate deviation although the brightness of the same gray scale changes, especially for the color expression familiar to human eyes such as human image skin color, even if the change curve of the gray scale of the brightness is corrected to be consistent, if slight color deviation is generated, the color still can be perceived by human eyes very easily.
The conventional method for compensating the display viewing angle further includes adding a diffusion film or a diffraction film on the surface of the liquid crystal display panel to diffuse and transmit the front-view light to the side-view angle, but because the optical film that is increasingly thinner tends to be thinner, it is difficult to generate light with sufficient diffusion angle due to insufficient diffusion optical path in the thickness direction, and the diffusion angle can be increased only by adding diffusion particles, which will affect the fineness of the displayed image. However, the method of changing the angle of the outgoing light by the diffraction film cannot perform the equal correction on the color deviation of the side viewing angle transmitted to the liquid crystal display panel for each wavelength because the diffraction efficiency of the diffraction film for different wavelengths is not consistent, and the diffraction is only suitable for enhancing the intensity of the light at a specific angle, and the distribution continuity of the light in each side viewing angle range is not good.
Therefore, the present invention discloses a liquid crystal display, which can maintain the color representation close to the same as the front viewing range within the viewing angle range of the side viewing angle, thereby improving the image quality.
Disclosure of Invention
In view of the problems in the prior art, the present invention provides a liquid crystal display to solve the above problems.
Therefore, an object of the present invention is to provide a liquid crystal display, which includes:
a liquid crystal display panel; and
the color improving film is arranged on the light-emitting surface of the liquid crystal display panel and comprises:
a substrate;
a strip-shaped micro prism layer with a first refractive index n1, wherein the strip-shaped micro prism layer comprises a plurality of strip-shaped micro prisms extending along a first direction, the first direction intersects with the horizontal direction of the liquid crystal display panel at an angle between 90 DEG +/-25 DEG, any one strip-shaped micro prism has at least one light guide inclined plane, an included angle theta is formed between the light guide inclined plane and the normal direction of the film surface of the color improving film on the section vertical to the first direction, and the ratio of the total projection width on the film surface of the color improving film to the whole width of the color improving film is not less than 20% and not more than 30%; and
a leveling layer having a second refractive index n2, wherein the second refractive index n2 is greater than the first refractive index n1, and the leveling layer covers and planarizes the strip-shaped micro prism layer and is disposed adjacent to the liquid crystal display panel side;
wherein, the side view angle average color deviation value of the LCD
Not greater than 0.01, the side viewing angle average color shift value
Represents the arithmetic mean of the difference Δ u 'v' between the CIE76 color coordinates of each side view angle measured at 40 DEG to 60 DEG with respect to the normal viewing angle of 0 DEG in the horizontal orientation.
As an optional technical solution, a difference between the first refractive index n1 and the second refractive index n2 is not less than 0.1 and not more than 0.3.
As an optional technical solution, the included angle θ formed by any one of the light guide slopes and the normal direction of the color improving film surface on the cross section perpendicular to the first direction is greater than 0 ° and less than 20 °.
As an optional technical solution, the projection width of any one of the light guide slopes on the color improving film surface on the cross section perpendicular to the first direction is between 0.015 μm and 3.5 μm.
As an optional technical scheme, the height of any one strip-shaped micro prism is between 0.9 and 5 microns.
As an optional technical solution, when the light guide slopes of the strip-shaped micro prisms are adjacent to each other, the light guide slopes are directly connected to each other or separated by a space.
As an optional technical solution, when the adjacent light guide slopes are separated by a distance, the distance is the shortest distance between the light guide slopes, and the distance is between 0.38 μm and 12.3 μm.
As an optional technical solution, a plurality of adjacent light guide slopes are symmetrical or asymmetrical.
As an optional technical solution, the light guide slopes have the same or different pitches from each other.
As an optional technical solution, the liquid crystal display further includes a functional coating formed on the surface of the substrate of the color-improving film, wherein the functional coating may be one or a combination of a group consisting of a hard coating, an anti-reflection layer, and an anti-glare layer.
Compared with the prior art, the liquid crystal display of the invention has the color improving film, and the color improving film comprises: the micro-prism structure comprises a substrate, a strip-shaped micro-prism layer and a filling and leveling layer. The strip-shaped micro prism layer is provided with a plurality of strip-shaped micro prisms arranged along a first direction, any one strip-shaped micro prism is provided with at least one light guide inclined plane, and an included angle is formed between the light guide inclined plane and the normal direction of the film surface of the color improving film on the section perpendicular to the first direction. The strip-shaped micro prism layer has a first refractive index n1, the filling layer has a second refractive index n2, and the second refractive index n2 is greater than the first refractive index n 1. Average color shift value of LCD
Not more than 0.01. Therefore, the liquid crystal display can improve the problem of side view character deviation without influencing the display quality of a front view angle.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a cross-sectional view of a liquid crystal display according to an embodiment of the disclosure.
FIG. 2 is a perspective view of a surface structure of a color improving film according to an embodiment of the present invention.
FIG. 3 is a schematic diagram illustrating a color improving film of an LCD for improving image quality in a side view angle range according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view of a disclosed color improvement film, according to one embodiment of the invention.
FIG. 5 is a cross-sectional view of a color improving film according to another embodiment of the present disclosure.
Fig. 6 is a cross-sectional view of a liquid crystal display according to another embodiment of the disclosure.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following detailed description of the embodiments is given.
First, referring to fig. 1 and fig. 2 together, fig. 1 is a cross-sectional view of a liquid crystal display according to an embodiment of the invention, and fig. 2 is a perspective view of a surface structure of a strip-shaped micro prism layer of a color improving film of a liquid crystal display according to an embodiment of the invention. The liquid crystal display 1 includes: a liquid crystal display panel 2; and a color improving film 3 disposed on the light emitting surface of the liquid crystal display panel 2, the color improving film 3 including: a substrate 31; a strip-shaped micro prism layer 32 having a first refractive index n1 and including a plurality of strip-shaped micro prisms 321 extending along a first direction D1 and formed on the substrate 31, wherein the first direction D1 intersects with the horizontal direction (i.e., the X-axis direction) of the liquid crystal display panel 2 at an angle between 90 ° ± 25 °, any one of the strip-shaped micro prisms 321 has at least one light guide inclined plane 321a, any one of the light guide inclined planes 321a forms an included angle θ with the normal direction of the film surface of the color improving film 3 on a cross section perpendicular to the first direction D1, and the ratio of the total projection width w of any one of the light guide inclined planes 321a on the film surface of the color improving film 3 to the entire width of the color improving film 3 is not less than 20% and not more than 30%; and a filling layer 33 having a second refractive index n2, wherein the second refractive index n2 is greater than the first refractive index n1, and the filling layer 33 covers and flattens the strip-shaped microprismsA layer 32 disposed adjacent to the liquid crystal display panel 2; wherein, the side view angle average color deviation value of the LCD 1
Not greater than 0.01, the side viewing angle average color shift value
Represents the arithmetic mean of the difference Δ u 'v' between the CIE76 color coordinate distances measured at a side viewing angle of 40 DEG to 60 DEG with respect to the normal viewing angle of 0 deg.
The conventional CIEXYZ tristimulus color coordinate system cannot correctly express the ability of human eyes to resolve color shifts of brightness, lightness and saturation due to non-uniformity. In the industry of color-related manufacturing, color deviation needs to be evaluated to maintain color consistency. Therefore, the international commission on illumination CIE in 1976 proposed CIE76(L, u, v) and CIE76(L, a, b) which are uniform color spaces obtained based on CIEXYZ color space conversion. CIE76(L, a, b) is commonly used in the printing industry, and CIE76(L, u, v) is suitable for the color display industry because coordinates are light additive, because the brightness L of a color display is usually a mixed color composition of different wavelengths, such as red, green and blue light, and therefore, when the brightness L changes, the coordinate values (u ', v') change, which affects the hue and chroma of the displayed image, and the color deviation of the color from the reference point at a specific brightness value can be quantified by comparing the difference Δ u 'v' from the color coordinate distance of the reference point.
In a large-sized lcd panel, especially when multiple users need to view the lcd panel simultaneously, the image quality requirement in the range of viewing angles covered by the horizontal direction is relatively greater than that in the vertical direction. Referring to fig. 3, fig. 3 is a schematic diagram illustrating a principle of using a color improving film of a liquid crystal display to improve image quality in a side view angle range according to an embodiment of the invention. The plurality of strip micro prisms 321 of the strip micro prism layer 32 extend along the first direction D1, and intersect with the horizontal direction (i.e. the X-axis direction) of the liquid crystal display panel 2 at an angle between 90 ° ± 25 °, the light guide inclined planes 321a of the plurality of strip micro prisms 321 can perform a large deflection of the first light path for the light L1 and L2 emitted from the liquid crystal display panel 2 by the total reflection effect and the polarization effect of the Brewster angle (Brewster angle) without multiple scattering and refraction, so as to reduce the influence of additional color shift on the liquid crystal display due to the dispersion of multiple-time-deflected light beams at interfaces with different refractive indexes during the light guiding to the side viewing angle by the color improving film 3. Since the second refractive index n2 of the filling layer 33 is greater than the first refractive index n1 of the stripe-shaped micro prism layer 32, it can be seen that total reflection occurs in the plurality of light guide slopes 321a without losing the light intensity when the incident angle of the light L1 in the normal viewing angle range to the plurality of light guide slopes 321a is not less than the critical angle θ c obtained from the relation (1). And, for light L2 which is not totally incident from a normal viewing angle but has excellent color shift with respect to the opposite viewing angle, when the incident angle to the plurality of light guiding inclined planes 321a approaches the brewster angle θ B obtained from the relation (2), the reflected light in the Y-axis polarization direction can be generated. Since the light emitted from the polarizer (not shown) on the front surface of the lcd panel 2 has a relatively high polarization, especially when the absorption axis of the polarizer on the front surface of the lcd panel 2 is the X-axis direction, most of the light L2 emitted from the lcd panel 2 has been the light component in the Y-axis polarization direction, and therefore, when the horizontal direction of the lcd panel 2 intersects the first direction D1 of the plurality of strip-shaped micro prisms 321 at an angle between 90 ° ± 25 °, the color improving film 3 further has a better light guiding efficiency of reflection toward a large angle.
θc＝sin-1(n1/n2) (1)
θB＝tan-1(n1/n2) (2)
In an embodiment of the invention, the strip-shaped micro-prism layer 32 can be obtained by first stamping a plurality of strip-shaped micro-prisms 321 on the substrate 31 and a first curable resin (not shown) with a first refractive index n1, and then curing the first curable resin. Then, a second curable resin (not shown) with a second refractive index n2 is filled on the surface of the strip-shaped micro-prism layer 32 and planarized to form the leveling layer 33, the first curable resin and the second curable resin can be light curable resin or heat curable resin, the first refractive index n1 and the second refractive index n2 can be selectively between 1.4 and 1.7, so that the difference between the first refractive index n1 and the second refractive index n2 is not less than 0.1 and not more than 0.3, and the second refractive index n2 is larger than the first refractive index n 1. The first curable resin and the second curable resin (not shown) may be, for example, acryl resin, silicon resin, urethane resin, epoxy resin, or a combination thereof.
In an embodiment of the present invention, the substrate 31 of the color-improving film 3 may be made of polyethylene terephthalate (PET), Polycarbonate (PC), cellulose Triacetate (TAC), polymethyl methacrylate (PMMA), Polyimide (PI), or Cyclic Olefin Polymer (COP), and the thickness thereof may be between 30 μm and 300 μm.
Referring to fig. 1 and 4 together, fig. 4 is a cross-sectional view of a color-improving film according to an embodiment of the invention, in an embodiment of the invention, an included angle θ formed by a light guide slope 321a of a plurality of strip-shaped micro prisms 321 and a normal direction of a film surface of the color-improving film 3 on a cross section perpendicular to the first direction is greater than 0 ° and less than 20 °, and by controlling a range of the included angle θ, a normal viewing angle light ray with low color cast emitted from a liquid crystal display panel can properly pass through an incident angle range conforming to the critical angle θ c and the brewster angle θ B, so as to generate enough reflected light to be transmitted to a side viewing angle with a large range. The ratio of the total projection width w of any one of the light guide slopes 321a of the strip-shaped micro prism layer 32 on the film surface of the color improving film 3 on the cross section perpendicular to the first direction to the entire width of the color improving film 3 is not less than 20% and not more than 30%, which can avoid the insufficient or excessive ratio of the effective light guide areas of the light guide slopes 321a, thereby causing insufficient luminous flux after effective light guide, or reducing the display brightness and contrast at the front viewing angle too much. Although the overall width of the color improving film 3 is usually not constant according to the size of the liquid crystal display panel, since the color improving film 3 is usually manufactured by forming a plurality of repeating units of the strip-shaped micro prisms 321 by means of micro-engraving, embossing, etc., and then forming the strip-shaped micro prism layer 32 by distributing the repeating units on the overall surface of the color improving film 3, in one embodiment, the ratio of the total projection width w of the plurality of light guide inclined planes 321a of the strip-shaped micro prism layer 32 to the overall width of the color improving film 3 can be obtained by calculating the ratio of the projection width w of the plurality of light guide inclined planes 321a in the repeating units. The projection width w of each light guiding inclined plane 321a of any one of the strip-shaped micro prisms 321 on the film surface of the color improving film 3 on the cross section perpendicular to the first direction is between 0.015 μm and 3.5 μm. The height h of any one of the strip-shaped microprisms 321 is between 0.9 μm and 5 μm.
Referring to fig. 4 and 5 together, fig. 5 is a cross-sectional view illustrating a color-improving film according to another embodiment of the present invention, in which any one of the strip-shaped micro prisms 321 may have a light-guiding slant 321a at one side or both sides thereof in a first direction, the light-guiding slants 321a of the strip-shaped micro prisms 321 are adjacent to each other or separated by a distance g, when the light-guiding slants 321a of the strip-shaped micro prisms 321 are directly connected to each other, a triangular strip-shaped micro prism 321 having only a top corner 321b or a bottom end 321c connected to each other between two adjacent strip-shaped micro prisms 321 is formed, when the adjacent light-guiding slants 321a are separated by a distance g, the distance g is defined as a shortest distance between the light-guiding slants 321a, and since the distance g is used only to correspondingly control a ratio of a sum of projection widths w of the light-guiding slants 321a to an entire width of the color-improving film 3, the side view angle of the liquid crystal display panel is optimized, and the effect of reflecting and guiding light to the side view angle as the plurality of light guiding slopes 321a is not provided, so the distance g is not limited to the width of the top plane 321d or the bottom plane 321e of the strip-shaped micro-prisms 321, and the distance g is between 0.38 μm and 12.3 μm. In another embodiment of the present invention, the plurality of strip-shaped micro-prisms 321 may be independently set to be the same or partially the same according to the pixel arrangement, the pixel size, the overall requirement or the product design requirement of different lcd panels, and therefore, the adjacent light guide inclined planes 321a may be symmetrical or asymmetrical, and the distances g between the light guide inclined planes 321a may also be the same or different.
Referring to fig. 6, in another embodiment of the present invention, the liquid crystal display 11 further includes a functional coating 4 formed on the surface of the substrate 31 of the color improving film 3, wherein the functional coating 4 can be selected from one or a combination of a group consisting of a hard coating, an anti-reflection layer, and an anti-glare layer.
The following examples are intended to further illustrate the invention, but the invention is not limited thereto.
Examples
Example 1
In the lcd disclosed in this embodiment 1, a liquid crystal display panel is adopted with a brand name of BenQ50JM700, and a color improving film is laminated on a polarizing plate on the display side of the liquid crystal display panel itself in a manner of being attached to the polarizing plate. The first refractive index n1 of the strip-shaped micro prism layer of the color improving film is 1.51, the second refractive index n2 of the filling layer is 1.61, the intersection angle of the first direction D1 along which the plurality of strip-shaped micro prism layers are arranged and the horizontal direction of the liquid crystal display panel is 70 degrees, the ratio of the sum of the projection component widths w of the plurality of light guide inclined planes of the strip-shaped micro prism layer on the film surface of the color improving film to the whole width of the color improving film is 29.7 percent, the individual projection component width w is 1.10 mu m to 1.34 mu m, the included angle between each light guide inclined plane of the plurality of strip-shaped micro prisms and the normal line of the film surface of the color improving film is 12.5 degrees and 15 degrees in a staggered arrangement mode, and the height of any one strip-shaped micro prism is 5 mu m.
Example 2
In the liquid crystal display disclosed in example 2, the liquid crystal display panel used was SAMSUNG C32H711qe, and a color improving film was laminated on the display-side polarizing plate of the liquid crystal display panel itself in an external attachment manner. The first refractive index n1 of the strip-shaped micro prism layer of the color improving film is 1.51, the second refractive index n2 of the filling layer is 1.61, the intersection angle of the first direction D1 along which the strip-shaped micro prism layers are arranged and the horizontal direction of the liquid crystal display panel is 75 degrees, the ratio of the sum of the projection component widths w of the light guide inclined planes of the strip-shaped micro prism layer on the film surface of the color improving film to the whole width of the color improving film is 20 percent, the individual projection component width w is 0.88 mu m to 1.34 mu m, the included angle between each light guide inclined plane of the strip-shaped micro prisms and the normal line of the film surface of the color improving film is 10 degrees and 15 degrees in staggered arrangement, and the height of any strip-shaped micro prism is 5 mu m.
Comparative example
Comparative example 1
Comparative example 1 is a liquid crystal display panel disclosed in example 1, but the color improving film of the present invention is not attached.
Comparative example 2
Comparative example 2 is a liquid crystal display panel disclosed in example 2, but the color improving film of the present invention is not attached.
Please refer to table one, which shows the color space coordinates (u ', v') of CIE76(L, u, v) converted from the light emission spectra of the bright white frames obtained in the above examples and comparative examples at the horizontal side viewing angle of 0 ° to 80 °, respectively, and the color coordinate distance difference Δ u 'v' obtained by comparing the difference with the light emission spectra obtained at the central normal viewing angle of 0 °. The color accuracy of the lcd panel has been optimized for the front viewing angle, so it can be seen from the measurement data in table one that the color deviation can be easily distinguished by human eyes when the distance difference of the color coordinates can be smaller, i.e. Δ u 'v' is smaller than 0.01, in the range of the front viewing angle of the lcd panel is closer to 0 ° to 30 ° in the comparative example 1 where the color improving film of the present invention is not attached to the lcd panel, and the distance difference of the color coordinates can be smaller, i.e. Δ u 'v' is smaller than 0.01, in the range of the front viewing angle of the lcd panel is closer to 0 ° to 20 ° in the comparative example 2 where the color improving film of the present invention is not attached to the lcd panel. However, as the side viewing angle becomes larger, for example, after the side viewing angle is larger than 40 °, Δ u 'v' of comparative examples 1 and 2 becomes larger than 0.01, and the degree of color shift perceived by human eyes becomes larger. However, the liquid crystal displays of embodiments 1 and 2 of the present invention can reduce the color coordinate distance difference by suppressing color shift through the color improving film in the structure, so that the relative comparison can be obtained in the whole range of the side viewing angle of 40 ° to 80 °Example 1 and comparative example 2 have lower Δ u 'v', especially the color coordinate distance difference Δ u 'v' of 40 ° to 60 ° at the side viewing angle with higher probability of use and the arithmetic mean thereof
The color deviation degrees are all less than 0.01, the degree that the human eyes are not easy to distinguish the color deviation is maintained, and the distance difference value delta u 'v' of the color coordinates is still not more than 0.01 within the range of the approximate front viewing angle of 0-30 degrees because the light guide efficiency is higher and excessive front viewing light rays are not lost, so that the liquid crystal display can obtain the nearly consistent color deviation degrees within the range of the front viewing angle of 40-60 degrees, and the quality and the consistency of the displayed image are improved.
Table one: white picture color coordinate distance difference delta u ' v ' of different side visual angles '
In summary, the liquid crystal display of the present invention has a color improving film, and the color improving film includes: the micro-prism structure comprises a substrate, a strip-shaped micro-prism layer and a filling and leveling layer. The strip-shaped micro prism layer is provided with a plurality of strip-shaped micro prisms arranged along a first direction, any one strip-shaped micro prism is provided with at least one light guide inclined plane, and an included angle is formed between the light guide inclined plane and the normal direction of the film surface of the color improving film on the section perpendicular to the first direction. The strip-shaped micro prism layer has a first refractive index n1, the filling layer has a second refractive index n2, and the second refractive index n2 is greater than the first refractive index n 1. Average color shift value of LCD
Not more than 0.01. Therefore, the liquid crystal display can improve the problem of side view character deviation without influencing the display quality of a front view angle.
The present invention is capable of other embodiments, and various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A liquid crystal display, comprising:
a liquid crystal display panel; and
the color improving film is arranged on the light-emitting surface of the liquid crystal display panel and comprises:
a substrate;
a strip-shaped micro prism layer with a first refractive index n1, wherein the strip-shaped micro prism layer comprises a plurality of strip-shaped micro prisms extending along a first direction, the first direction intersects with the horizontal direction of the liquid crystal display panel at an angle between 90 DEG +/-25 DEG, any one strip-shaped micro prism has at least one light guide inclined plane, an included angle theta is formed between the light guide inclined plane and the normal direction of the film surface of the color improving film on the section perpendicular to the first direction, and the ratio of the total projection width on the film surface of the color improving film to the whole width of the color improving film is not less than 20% and not more than 30%; and
a leveling layer having a second refractive index n2, wherein the second refractive index n2 is greater than the first refractive index n1, and the leveling layer covers and planarizes the strip-shaped micro prism layer and is disposed adjacent to the liquid crystal display panel side;
wherein, the side view angle average color deviation value of the LCD
Not greater than 0.01, the side viewing angle average color shift value
Represents the arithmetic mean of the difference Δ u 'v' between the CIE76 color coordinates of each side view angle measured at 40 DEG to 60 DEG with respect to the normal viewing angle of 0 DEG in the horizontal orientation.
2. The liquid crystal display of claim 1, wherein the difference between the first refractive index n1 and the second refractive index n2 is not less than 0.1 and not more than 0.3.
3. The liquid crystal display of claim 1, wherein the included angle θ between any one of the light guiding slopes and the normal direction of the film surface of the color-improving film in the cross section perpendicular to the first direction is greater than 0 ° and less than 20 °.
4. The liquid crystal display of claim 1, wherein the projected width of any one of the light guiding slopes on the color improving film surface in a cross section perpendicular to the first direction is between 0.015 μm and 3.5 μm.
5. The liquid crystal display of claim 1, wherein the height of any one of the stripe-shaped microprisms is between 0.9 μm and 5 μm.
6. The liquid crystal display of claim 1, wherein the light guiding slopes of the plurality of strip-shaped micro prisms are directly connected to each other or separated by a space when adjacent to each other.
7. The liquid crystal display of claim 6, wherein when the adjacent light guide slopes are separated by a distance, the distance is the shortest distance between the light guide slopes, and the distance is between 0.38 μm and 12.3 μm.
8. The liquid crystal display of claim 6, wherein adjacent light guiding slopes are symmetrical or asymmetrical.
9. The liquid crystal display of claim 6, wherein the light guide slopes have the same or different pitches.
10. The liquid crystal display according to claim 1, further comprising a functional coating formed on the surface of the substrate of the color improving film, wherein the functional coating is selected from one or a combination of a group consisting of a hard coating, an anti-reflection layer, and an anti-glare layer.
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| CN202010167596.XA CN113467125A (en) | 2020-03-11 | 2020-03-11 | Liquid crystal display device with a light guide plate |
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| CN202010167596.XA CN113467125A (en) | 2020-03-11 | 2020-03-11 | Liquid crystal display device with a light guide plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116360148A (en) * | 2021-12-27 | 2023-06-30 | 明基材料有限公司 | Light redirecting film, polarizing plate and display comprising polarizing plate |
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