WO2014015634A1

WO2014015634A1 - Display panel and display device

Info

Publication number: WO2014015634A1
Application number: PCT/CN2012/087192
Authority: WO
Inventors: 马晓峰
Original assignee: 京东方科技集团股份有限公司
Priority date: 2012-07-25
Filing date: 2012-12-21
Publication date: 2014-01-30
Also published as: CN102778780B; CN102778780A

Abstract

Provided are a display panel and a display device. The display panel comprises a colour film substrate and an array substrate which are oppositely arranged, wherein the inner side of the array substrate is formed with a metal layer (3) and a pixel electrode, and the outer side of the array substrate is provided with a prism film (5). The prism film (5) changes the propagation direction of light vertically emitted to the metal layer (3) into the direction of light which is emitted from the pixel electrode after bypassing the metal level (3). On the premise of not increasing the brightness and the power consumption of a backlight source, the display panel and the display device improve the transmittance of an array substrate, and then improve the transmittance and the brightness of the display panel and the display device, thereby improving the quality thereof, and being more environmentally friendly.

Description

Display panel and display device

The invention relates to a display panel and a display device. Background technique

As an important flat panel display method, liquid crystal display has developed rapidly in the past ten years. It has the advantages of lightness, thinness and low energy consumption, and is widely used in modern information equipment such as televisions, computers, mobile phones and digital cameras. The basic structure of the liquid crystal display is: backlight part (light source, light guide plate, various diffusion films, prism film, brightness enhancement film, etc.), lower polarizer, array substrate, liquid crystal layer (including liquid crystal guiding layer), color film Substrate, and upper polarizer (and compensation film, etc.). The light emitted by the backlight enters the lower polarizer, passes through each layer and then exits from the upper polarizer. At this time, the brightness of the emitted light is only 7 to 8% or less of the incident light. The transmittance of the array substrate is about 60% or less due to the opaque metal layer (including the gate lines, the data lines, the gate electrodes, and the source and drain electrodes) on the array substrate. If the transmittance and brightness of the liquid crystal panel are improved by increasing the power consumption and brightness of the backlight, thereby improving the quality of the liquid crystal display, the cost of the device is undoubtedly increased. Summary of the invention

An embodiment of the present invention provides a display panel including a color film substrate and an array substrate disposed opposite to each other, a metal layer and a pixel electrode are formed on an inner side of the array substrate, and a prism film is disposed on an outer side of the array substrate. The prism film changes a direction of propagation of light perpendicularly directed toward the metal layer to bypass the metal layer and exit from the pixel electrode.

In an embodiment of the invention, the metal layer includes at least one of a gate line, a data line, a common electrode line, a gate electrode, a source electrode, and a drain electrode.

In an embodiment of the present invention, the prism film includes a plurality of fixed light guiding portions, and the cross section of the fixed guiding light portion is respectively two isosceles trapezoids arranged in close proximity; The distance between two adjacent vertices on the two upper bases of the two isosceles trapezoids and the corresponding each gate line, each data line, each common electrode line, each gate electrode, each source electrode or The width of each drain electrode is the same, and the gap between the two vertices is located at the corresponding gate line, data line, public power Directly below the polar line, the gate electrode, the source electrode or the drain electrode, the isosceles trapezoid satisfies siny>l/n, wherein γ is the angle between the waist of the isosceles trapezoid and the lower base, and η is The refractive index of the prism film.

In the embodiment of the present invention, the prism film includes a plurality of fixed light guiding portions, and the cross section of the fixed guiding light portion is respectively a parallelogram; the length of the bottom side of the parallelogram is corresponding to each of the gate lines, Each of the data lines, each of the common electrode lines, each of the gate electrodes, each of the source electrodes or each of the drain electrodes has the same width, and the parallelogram is located away from a bottom edge of the substrate at a corresponding gate line, data line Directly below the common electrode line, the gate electrode, the source electrode or the drain electrode, the parallelogram satisfies sinS≥l/n, where δ is the acute angle between the oblique side and the bottom side of the parallelogram, η is The refractive index of the prism film.

In an embodiment of the invention, the prism film further includes a film bottom portion, and the plurality of guiding light portions are formed on the film bottom portion.

In an embodiment of the invention, the film bottom portion is integrally formed with the plurality of fixed light guiding portions. In the embodiment of the present invention, the outer side of the array substrate is further provided with a polarizer, and the film bottom portion or the fixed light guiding portion is adhered to the lower portion of the polarizer by liquid glue.

In the embodiment of the present invention, the prism film is polyethylene terephthalate, polycarbonate, polyether ether ketone, polystyrene, high density polyethylene, low density polyethylene, random polymerization Propylene, or polyethylene tetrafluoroethylene.

The embodiment of the invention further provides a display device comprising the above display panel. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present invention, and are not intended to limit the present invention. .

1 is a cross-sectional view of an array substrate of a display panel according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of the array substrate of the display panel of Embodiment 1;

3 is an optical path diagram of an array substrate of the display panel of FIG. 2;

4 is a cross-sectional view showing an embodiment of an array substrate of a display panel of Embodiment 2; and FIG. 5 is a cross-sectional view showing another embodiment of the array substrate of the display panel of Embodiment 2. detailed description The technical solutions of the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention.

The display panel of the embodiment of the invention includes a color film substrate and an array substrate disposed oppositely. As shown in FIG. 1 , the array substrate includes a substrate 1 and a polarizer 2 , and the polarizer 2 is disposed on the light incident surface of the substrate 1 (toward the backlight) On the outer side surface, a metal layer 3 and a pixel region 4 are formed on the inner side of the substrate 1 (the side opposite to the outer side surface), and the pixel region 4 is a light transmissive region, and the metal layer 3 includes an entrance portion to be incident thereon. At least one of the gate line, the data line, the common electrode line, the gate electrode, the source electrode, and the drain electrode reflected by the light, the metal layer 3 is the most important factor for reducing the transmittance of the array substrate, in order to improve the transmittance of the array substrate. Over-rate and brightness, the display panel of the present invention is provided on the outside of the array substrate under the polarizer 2, and the prism film 5 is capable of changing the direction of propagation of light (indicated by an arrow) directed perpendicularly to the metal layer 3 to After the metal layer 3 is bypassed, it is emitted from the pixel region 4, thereby increasing the transmittance of the array substrate, thereby improving the display panel and the display device without increasing the brightness and power consumption of the backlight. Transmittance and brightness, improving its quality and more green, green.

The structure of the present invention will be further illustrated by the following specific examples.

Example 1

As shown in FIG. 2, in the display panel of the present embodiment, the prism film includes a film bottom portion 5-1 and a plurality of fixed light guiding portions 5-2, and the film bottom portion 5-1 is a film structure of a prism film material. The plurality of fixed light guiding portions 5-2 are formed on the film bottom portion 5-1, and the film bottom portion 5-1 or the fixed light guiding portion 5-2 is adhered to the lower side of the polarizing plate 2 by liquid glue (only shown in the drawing) The structure in which the film bottom portion 5-1 is adhered to the lower side of the polarizer 2 by liquid glue), and in order to achieve the purpose of changing the optical path of each of the fixed light portions 5-2, it is necessary to accurately realize the following manner. Alignment: The guide light portion 5-2 is located under each gate line, each data line, each common electrode line, each gate electrode, each source electrode or each drain electrode, and each guide The cross section of the light portion 5-2 is respectively two isosceles trapezoids arranged in close proximity, and the distance s between two adjacent vertices on the two upper bases of the two isosceles trapezoids of each of the fixed light portions 5-2 Same as the width h of the corresponding gate line, data line, common electrode line, gate electrode, source electrode or drain electrode, and two tops A gap positioned between the corresponding gate lines, data lines, the common electrode line, the gate electrode, the source electrode or the drain electrode immediately below. As shown in Figure 3 (α is the angle of incidence, β The reflection path is the optical path of the light passing through the prism film 5 of such a configuration and the alignment mode: the light ray a is incident on the upper bottom of the fixed light portion 5-1 through the prism film 5, and is in the isosceles trapezoid The range of the upper base can be directly emitted without being refracted, and then transmitted through the array substrate; when the light b enters the prism film 5 and then encounters the waist portion of the guiding light portion 5-2, it is emitted by reflecting to the upper bottom. In order to achieve total reflection of light, the incident angle α is greater than or equal to the critical angle 0c of the prism film 5, because sin0c=l/n, α=γ is easily obtained from the figure, so in the fixed light portion 5-2, etc. The angle _γ between the waist portion of the waist trapezoid and the lower base should be satisfied, _s inY≥sinec=l/n, where n is the refractive index of the material of the prism film 5, so that the direction of light perpendicularly incident on the metal layer 3 is propagated. It is changed and can be transmitted from the pixel region 4 after the change, thereby improving the transmittance of the array substrate.

The material of the prism film 5 is required to have high transmittance, easy processability, and thermal deformation stability. Polymer resins meeting the above requirements can be used. Corresponding polymer materials, refractive index and critical angle are, for example: polyethylene terephthalate PET (refractive index is 1.58, critical angle is 39.3.), polycarbonate PC (refractive index is 1.58, critical angle) 39.3.), polyetheretherketone PEEK (refractive index 1.68, critical angle 36.5.), polystyrene PS (refractive index 1.59, critical angle 39), high density polyethylene HDPE (refractive index 1.54) , critical angle is 40.5 °), low density polyethylene (refractive index is 1.51, critical angle is 41.5.), random polypropylene PP (refractive index 1.47, critical angle is 42.9.), polyethylene tetrafluoroethylene ETFE ( The refractive index is 1.36, the critical angle is 47.3.) and so on.

Example 2

As shown in FIG. 4 and FIG. 5, in the display panel of the present embodiment, the prism film includes a film bottom portion 5-1 and a plurality of fixed light guiding portions 5-2, and the film bottom portion 5-1 is a prism film material. a film structure, the plurality of fixed light guiding portions 5-2 are formed on the film bottom portion 5-1, and the film bottom portion 5-1 or the fixed light guiding portion 5-2 is adhered to the lower side of the polarizing plate 2 by liquid glue (Fig. Only the structure in which the film bottom portion 5-1 is adhered to the lower side of the polarizer 2 by liquid glue is shown, and in order to achieve the purpose of changing the optical path of each of the fixed light guiding portions 5-2, it is required to accurately realize The alignment of the following modes: the guiding light portion 5-2 is located under each gate line, each data line, each common electrode line, each gate electrode, each source electrode or each drain electrode, and a profile The lengths of the bottom sides of the parallelograms are respectively the same as the widths h of the corresponding gate lines, data lines, common electrode lines, gate electrodes, source electrodes or drain electrodes, and the parallelograms are located away from the bottom edge of the substrate 1. Corresponding gate line, data line, common electrode line, gate electrode, source Directly below the electrode or drain electrode. As shown in Figure 4 and Figure 5, light c After the incident, the light guide d is incident on the array substrate pixel region 4 directly through the polarizer 2 without passing through the polarizing guide portion 5-2 of the parallelogram; the light ray d is incident on the prism film 5 from the bottom edge of the parallelogram shaped guide portion 5-2. After that, when the oblique portion of the guiding light portion 5-2 is encountered, two total reflections are generated to reach the upper bottom edge; after the light e is incident, the oblique portion of the light guiding portion 5-2 is incident on the parallelogram, and is once refracted. After the shot from the top. In order to achieve total reflection of the light, the angle δ between the oblique side of the parallelogram and the acute angle of the bottom edge is greater than or equal to the critical angle 6c, because sinec=l/n, so δ is satisfied, sin5>sin0c=l/n, n is the prism film 5 The refractive index of the material.

The material of the prism film 5 is required to have high transmittance, easy processability, and thermal deformation stability. Polymer resins meeting the above requirements can be used. Corresponding polymer materials, refractive index and critical angle are, for example: polyethylene terephthalate PET (refractive index is 1.58, critical angle is 39.3.), polycarbonate PC (refractive index is 1.58, critical angle) 39.3.), polyetheretherketone PEEK (refractive index 1.68, critical angle 36.5.), polystyrene PS (refractive index 1.59, critical angle 39), high density polyethylene HDPE (refractive index 1.54) , the critical angle is 40.5.), low density polyethylene (refractive index is 1.51, critical angle is 41.5.), atactic polypropylene PP (refractive index is 1.47, critical angle is 42.9.), polyethylene tetrafluoroethylene ETFE ( The refractive index is 1.36, the critical angle is 47.3.) and so on.

It should be noted that the shape and material of the guiding light portion 5-2 of the prism film 5 may be the same or different on the array substrate of the same display panel, and the shape may be any of the first embodiment and the second embodiment. One can be set according to needs or process convenience. When the light guiding portion 5-2 is made of the same material as the film bottom portion 5-1, the light guiding portion 5-2 and the film bottom portion 5-1 can be integrally molded.

Furthermore, the present invention also provides a display device comprising the above display panel, which may be any type of TN, PVA, MVA, FFS or IPS type liquid crystal display device such as a liquid crystal panel, a liquid crystal display, a liquid crystal television or the like.

The above is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims.

Claims

claims

1. A display panel, including a color filter substrate and an array substrate arranged oppositely. A metal layer and a pixel electrode are formed on the inside of the array substrate. A prism film is provided on the outside of the array substrate. The prism film will The propagation direction of the light perpendicular to the metal layer is changed to bypass the metal layer and then emerge from the pixel electrode.

2. The display panel of claim 1, wherein the metal layer includes at least one of a gate line, a data line, a common electrode line, a gate electrode, a source electrode, and a drain electrode.

3. The display panel of claim 2, wherein the prism film includes a plurality of directional light guide portions, and the cross sections of the directional light guide portions are each in the shape of two adjacently arranged isosceles trapezoids;

The distance between the two adjacent vertices on the two upper bases of the two isosceles trapezoids of each directional light guide part corresponds to each gate line, each data line, and each common electrode line. , the width of each gate electrode, each source electrode or each drain electrode is the same, and the gap between the two vertices is located on the corresponding gate line, data line, common electrode line, gate electrode, source electrode or drain electrode directly below; the isosceles trapezoid satisfies sin _Y ≥ l/n, where γ is the angle between the waist and the lower bottom of the isosceles trapezoid, and eta is the refractive index of the prism film.

4. The display panel of claim 2, wherein the prism film includes a plurality of directional light guide portions, and the cross sections of the directional light guide portions are each in the shape of a parallelogram;

The length of the base of the parallelogram is the same as the width of each corresponding gate line, each data line, each common electrode line, each gate electrode, each source electrode or each drain electrode, and the parallelogram One bottom edge of the quadrilateral away from the substrate is located directly below the corresponding gate line, data line, common electrode line, gate electrode, source electrode or drain electrode;

The parallelogram satisfies sin5≥l/n, δ is the acute angle between the hypotenuse and the base of the parallelogram, and eta is the refractive index of the prism film.

5. The display panel according to claim 3 or 4, wherein the prism film further includes a film bottom portion, and the plurality of directional light guide portions are formed on the film bottom portion.

6. The display panel of claim 5, wherein the film bottom portion is integrally formed with the plurality of directional light guide portions.

7. The display panel according to claim 5, wherein a polarizer is further provided on the outside of the array substrate; the bottom part of the film or the directional light guide part is bonded under the polarizer through liquid glue. Square.

8. The display panel according to any one of claims 1 to 7, wherein the prism film is polyethylene terephthalate, polycarbonate, polyetheretherketone, polystyrene, high-density Polyethylene, low density polyethylene, atactic polypropylene, or polyethylene tetrafluoroethylene.

9. A display device, including the display panel according to any one of claims 1-8.