KR102063985B1 - Flat Panel Display Device - Google Patents

Abstract

The present invention is a first substrate; A second substrate spaced apart from the first substrate; A quantum bar disposed in an area of subpixels including red, green, and blue defined between the first substrate and the second substrate; A light source unit disposed on a rear surface of the first substrate and providing light to the quantum rods; And a color filter disposed only within one region of the red, green, and blue subpixels.

Description

Flat Panel Display Device

The present invention relates to a flat panel display.

With the development of information technology, the market for a display device, which is a connection medium between a user and information, is growing. Accordingly, the use of flat panel display devices such as organic light emitting display devices, liquid crystal display devices, electrophoretic display devices, and plasma display devices is increasing. Such flat panel display devices are implemented in small, medium and large sizes.

Recently, researches for implementing flat panel displays using quantum bars have been conducted. Quantum rods (QRs) are based on CdSe and have characteristics such as unusual optical and electrical properties, wide absorption bands and narrow emission bands, and excellent resistance to photobleaching. In addition, the emission color may be adjusted by adjusting the size of the bar.

Quantum bars produce light polarized by light or energy supplied from the outside, and the degree of polarization depends on the aspect ratio of the nanocrystals. Quantum bars are brighter monomolecular probes when compared to quantum dots.

Quantum bars are reported to have various properties as biomarkers, which can further improve the field of ultra-sensitive imaging. Therefore, when using the quantum bar, there are many advantages that can improve the efficiency and light emission characteristics of the flat panel display device more than the present, the research using this is required.

The present invention for solving the above-described problems of the background art flat panel display that can improve the half-width of the emission spectrum for the red, green and blue generated by the quantum bar to the same or the same level, and improve the color purity for the blue To provide a device. In addition, the present invention is to provide a flat panel display having a structure that can improve the light emission characteristics of the quantum bar and can easily form it.

The present invention as a means for solving the above problems the first substrate; A second substrate spaced apart from the first substrate; A quantum bar disposed in an area of subpixels including red, green, and blue defined between the first substrate and the second substrate; A light source unit disposed on a rear surface of the first substrate and providing light to the quantum rods; And a color filter disposed only within one region of the red, green, and blue subpixels.

The color filter may be a blue color filter disposed only within an area of the blue subpixel.

The blue color filter may be formed on an inner surface of the second substrate facing the first substrate.

The blue color filter may be formed on the insulating layer positioned on the quantum bar.

The black substrate may include a black matrix disposed on an inner surface of the second substrate facing the first substrate and dividing a boundary area between subpixels.

The quantum bar may generate polarized light when light is provided from the light source unit, and may not generate light when voltage or current is supplied to the quantum bar.

The quantum bar may be positioned between the first electrode and the second electrode formed in the horizontal direction.

The quantum bar may be positioned between the first electrode and the second electrode formed in the vertical direction.

The barrier ribs may include barrier ribs formed in a vertical direction on the first substrate to separate the boundary regions between the subpixels.

Quantum bars can be arranged in a horizontal direction.

The present invention has the effect of providing a flat panel display device capable of improving the half width of the emission spectrum of red, green, and blue generated by quantum bars to a similar or the same level, and improving color purity of blue. In addition, the present invention has the effect of providing a flat panel display device having a structure that can improve the light emission characteristics of the quantum bar and can easily form it.

1 is a cross-sectional structure diagram of a flat panel display device according to a first embodiment of the present invention.
2 is a view for explaining the configuration and characteristics of a quantum bar.
3 and 4 are cross-sectional structural diagrams for explaining light emission characteristics of the flat panel display device according to the first embodiment compared to the comparative example.
5 is a cross-sectional structure diagram of a flat panel display device according to a second embodiment of the present invention.
6 is an exemplary view of a light source unit.
7 is a cross-sectional structure diagram of a flat panel display device according to a third embodiment of the present invention.
8 is a cross-sectional structure diagram of a flat panel display device according to a fourth embodiment of the present invention.
9 is a cross-sectional structure diagram of a flat panel display device according to a fifth embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the specific content for the practice of the present invention will be described.

First Embodiment

1 is a cross-sectional structural view of a flat panel display device according to a first exemplary embodiment of the present invention, and FIG. 2 is a view for explaining the configuration and characteristics of a quantum bar.

1 and 2, a flat panel display device according to a first embodiment of the present invention includes a first substrate 120a, a second substrate 120b, a quantum bar 130, a light source unit 110, and a color. Filter CFB and black matrix BM are included.

The flat panel display device according to the first exemplary embodiment of the present invention uses a quantum bar 130 formed between the first substrate 120a and the second substrate 120b. The quantum rod 130 is controlled to emit light according to the size, composition and shape of the particles. The quantum bar 130 has a bar shape having a horizontal direction (or a horizontal direction) longer than a vertical direction (or a vertical direction). The quantum bar 130 may be formed to have an aspect ratio of 2: 1 or more.

Quantum rod 130 has shell 131 and core 132. Quantum rod 130 is made of a semiconductor material. The quantum rod 130 is made of a semiconductor material combined with one or more alloys selected from Group II-VI, Group III-V, Group IV-VI, Group III-VI, Group IV semiconductor elements and alloys. Can be. In addition, the quantum rods 130 may be formed of a semiconductor material further including a doped material together with their materials.

Specifically, the semiconductor material may be a Group II-VI material selected from CdSe, Cds, CdTe, ZnO, ZnSe, ZnS, ZnTe, HgS, HgSe, HgTe, CdZnSe, and combinations thereof. The semiconductor material may also be a Group III-V material selected from InAs, InP, InN, GaN, InSb, InAsP, InGaAs, GaAs, GaP, GaSb, AlP, AlN, AlAs, AlSb, CdSeTe, ZnCdSe, and combinations thereof. Can be. The semiconductor material may also be a Group IV-VI material selected from PbSe, PbTe, PbS, PbSnTe, TI ₂ SnTe ₅ and combinations thereof.

The quantum rod 130 may emit red, green, blue, and the like as well as other colors depending on the materials forming the shell 131 and the core 132. A red quantum bar 130R emitting red light is disposed in the red subpixel area. In the green subpixel area, a green quantum bar 130G emitting green light is positioned. A blue quantum bar 130B emitting blue light is disposed in the blue subpixel area.

The quantum bar 130 is discharged by an inkjet method and arranged in a horizontal direction so that the long bar shape is horizontal. However, the present invention is not limited thereto, and the quantum bars 130 may be arranged in a predetermined direction by the alignment layer. In addition, the quantum bars 130 may be arranged in a vertical direction as well as in a horizontal direction or at different angles by voltages or currents applied thereto.

The light source unit 110 is disposed on the rear surface of the first substrate 120a and provides light to the quantum bar 130. The light source unit 110 may emit ultraviolet light or visible light. The light source unit 110 may include a lamp, an LED, etc., but is not limited thereto. However, the light source unit 110 may emit light having a shorter wavelength than the emission wavelength of the quantum rod 130. In the embodiment, the quantum rod 130 emits light polarized by the light emitted from the light source unit 110. However, the quantum bar 130 may emit light even by energy other than the light emitted from the light source unit 110.

The first substrate 120a and the second substrate 120b may be selected from glass, film, resin, etc. having high transparency and light transmittance, and the first substrate 120a and the second substrate 120b may be the same or different from each other. May be selected as the material. In addition, the first and second substrates 120a and 120b may be sealed together by a sealing material formed on the outside thereof.

On the inner surface of the second substrate 120b facing the first substrate 120a, a black matrix BM is formed to divide the boundary region between the subpixels. The black matrix BM serves to prevent interference or mixing of light between the subpixels. The black matrix BM may be formed of a resin including a black pigment, but is not limited thereto.

The color filter CFB is formed only in one region of the red, green, and blue subpixels. The color filter CFB is a blue color filter CFB disposed only in the region of the blue subpixel. The blue color filter CFB is formed on an inner surface of the second substrate 120b facing the first substrate 120a. The blue color filter CFB may include at least one of a phosphor and a light emitter.

The reason why the blue color filter CFB is formed only in the region of the blue subpixel among the red, green, and blue subpixels is as follows.

3 and 4 are cross-sectional structural diagrams for describing light emission characteristics of the flat panel display device according to the first embodiment compared to the comparative example.

As shown in FIG. 3, the flat panel display according to the comparative example has a structure similar to that of FIG. 1. However, the blue color filter is not included in the area of the blue subpixel as in the comparative example of FIG. 3.

The red and green quantum bars 130R and 130G that emit red and green are highly efficient and stable, have small half-widths (RW, GW) in the emission spectrum, and have high color purity. On the other hand, the blue quantum bar 130B emitting blue has a larger half width BW of the emission spectrum and lower color purity than the red and green quantum bars 130R and 130G emitting red and green.

As shown in FIG. 4, the flat panel display device according to the first embodiment includes the blue color filter CFB only in the blue subpixel area. If the blue color filter CFB is formed in the blue sub-pixel region, the half width BW of the emission spectrum with respect to blue may be reduced. That is, the blue color filter CFB removes the periphery of the full width at half maximum of the emission spectrum for blue, such as "DA," and thus emits light in the form of the full width at half maximum of the emission spectrum for red and green (RW, GW). Can play a role in improving

In addition, when the blue color filter CFB is formed in the blue sub-pixel region, the blue color filter CFB uses the deep color of the low color purity of the blue quantum bar 130B, which is at the current sky blue level. Can improve to level.

Second Embodiment

5 is a cross-sectional structural view of a flat panel display device according to a second exemplary embodiment of the present invention, and FIG. 6 is an exemplary view of a light source unit.

As shown in FIG. 5, the flat panel display according to the second exemplary embodiment of the present invention includes a first substrate 120a, a second substrate 120b, a quantum bar 130, a light source unit 110, and a color filter CFB. ) And black matrix (BM).

Materials and positions constituting the first substrate 120a, the second substrate 120b, the quantum rod 130, and the black matrix BM are the same as in the first embodiment, and thus description thereof will be omitted.

According to the second embodiment of the present invention, an insulating film 138 is formed on the quantum rod 130. The insulating film 138 may be selected as a material having high light transmittance. In the second embodiment of the present invention, the blue color filter CFB is formed only in the region of the blue subpixel. However, unlike the first embodiment, the blue color filter CFB is formed on the insulating layer 138.

Even if the blue color filter CFB is formed on the insulating film 138, the half width BW of the emission spectrum with respect to blue can be made small similarly or similarly to the first embodiment. In addition, it is possible to improve the low color purity of the blue quantum bar 130B, which is currently the sky blue level, to the deep blue level.

As shown in FIG. 6, the light source unit 110 includes a light source 111 and a light guide plate 112. The light source 111 is disposed on one side of the light source unit 110, and the light guide plate 112 is disposed to convert the point light source emitted from the light source 111 into a surface light source. The light source 111 may emit ultraviolet light (UV), but is not limited thereto.

Meanwhile, according to the modified embodiment of the second embodiment of the present invention, the flat panel display device may be formed in the same manner as the liquid crystal panel. However, red, green, and blue quantum bars 130R, 130G, and 130B are further formed in the red, green, and blue subpixel regions of the liquid crystal panel. That is, the red, green, and blue quantum bars 130R, 130G, and 130B may be formed in a shape included in the liquid crystal panel to improve light emission characteristics. In this case, the red and green color filters are eliminated and only the blue color filter is present in the liquid crystal panel.

Third Embodiment

7 is a cross-sectional structure diagram of a flat panel display device according to a third embodiment of the present invention.

As shown in FIG. 7, the flat panel display according to the third exemplary embodiment of the present invention includes a first substrate 120a, a second substrate 120b, a quantum bar 130, a light source unit 110, and a color filter CFB. ), A black matrix BM, barrier ribs 135, and a power supply controller 160.

Materials and positions constituting the first substrate 120a, the second substrate 120b, the quantum rod 130, the light source unit 110, the color filter CFB, and the black matrix BM are the same as those of the first embodiment. Therefore, description thereof will be omitted.

According to the third embodiment of the present invention, partition walls 135 formed in the vertical direction on the first substrate 120a are included to distinguish the boundary area between the subpixels. The partitions 135 serve to distinguish the boundary area between the red, green, and blue subpixels. The partitions 135 may have a tapered shape (in the form of upper and lower light) or an inverse taper shape (in the form of a lower light).

The partitions 135 serve to facilitate the separation of the red, green, and blue quantum bars 130R, 130G, and 130B, by area. For example, when the red, green, and blue quantum bars 130R, 130G, and 130B are formed by using an inkjet method, the partitions 135 do not mix the red, green, and blue quantum bars 130R, 130G, and 130B with each other. It serves to distinguish the areas. The partitions 135 may be formed to occupy two sides of the subpixels or may occupy all four sides.

The red, green, and blue quantum bars 130R, 130G, and 130B generate polarized light when light is provided from the light source unit 110. However, in the case of the red, green, and blue quantum bars 130R, 130G, and 130B, light is not generated when voltage or current is supplied to them. Thus, the red, green and blue quantum bars 130R, 130G, 130B are controlled by a power supply control unit 160 that supplies voltage or current to each of them.

Fourth Embodiment

8 is a cross-sectional structure diagram of a flat panel display device according to a fourth embodiment of the present invention.

As shown in FIG. 8, the flat panel display according to the fourth exemplary embodiment of the present invention includes a first substrate 120a, a second substrate 120b, a quantum bar 130, a light source unit 110, and a color filter CFB. ), A black matrix BM and a power supply controller 160 are included.

Materials and positions constituting the first substrate 120a, the second substrate 120b, the quantum rod 130, the light source unit 110, the color filter CFB, and the black matrix BM are the same as those of the first embodiment. Therefore, description thereof will be omitted.

According to the fourth embodiment of the present invention, the red, green, and blue quantum bars 130R, 130G, and 130B are positioned between the first electrode 121 and the second electrode 125 formed in the horizontal direction. The first electrode 121 and the second electrode 125 may be formed on the first substrate 120a. The first electrode 121 and the second electrode 125 may be formed of a metal having transparency. Specifically, the metal having transparency may be selected from ITO, IZO, ITZO, and the like, but is not limited thereto. The first electrode 121 and the second electrode 125 may be formed by a deposition method, but are not limited thereto.

The first electrode 121 is formed on one surface of the first substrate 120a. The red, green, and blue quantum bars 130R, 130G, and 130B are formed on the first electrode 121. The second electrode 125 is formed on the red, green, and blue quantum bars 130R, 130G, and 130B. One of the first electrode 121 and the second electrode 125 is formed as a front electrode to contact all of the red, green, and blue quantum bars 130R, 130G, and 130B, and the remaining one is a red, green, and blue quantum bar. And divided electrodes 130R, 130G, and 130B to be in contact with each other. The first electrode 121 and the second electrode 125 may be formed to cross each other or may be formed to overlap a part of the first electrode 121 and the second electrode 125.

The power supply controller 160 supplies a voltage or a current to the first electrode 121 and the second electrode 125 through wires formed on the first substrate 120a. The power supply controller 160 supplies voltages or currents of different levels to the first electrode 121 and the second electrode 125. For example, the power supply controller 160 may supply a positive voltage to the first electrode 121 and a negative voltage to the second electrode 125.

Fifth Embodiment

9 is a cross-sectional structure diagram of a flat panel display device according to a fifth embodiment of the present invention.

As shown in FIG. 9, the flat panel display according to the fifth exemplary embodiment of the present invention includes a first substrate 120a, a second substrate 120b, a quantum bar 130, a light source unit 110, and a color filter CFB. ), A black matrix BM, barrier ribs 135, and a power supply controller 160.

Materials and positions constituting the first substrate 120a, the second substrate 120b, the quantum rod 130, the light source unit 110, the color filter CFB, and the black matrix BM are the same as those of the first embodiment. Therefore, description thereof will be omitted.

The partitions 135 are formed in the vertical direction on the first substrate 120a to distinguish the boundary area between the subpixels. The partitions 135 serve to distinguish the boundary area between the red, green, and blue subpixels. The partitions 135 may have a tapered shape (in the form of cross-beaming light).

The partitions 135 serve to facilitate the separation of the red, green, and blue quantum bars 130R, 130G, and 130B, by area. For example, when the red, green, and blue quantum bars 130R, 130G, and 130B are formed by using an inkjet method, the partitions 135 do not mix the red, green, and blue quantum bars 130R, 130G, and 130B with each other. It serves to distinguish the areas. The partitions 135 may be formed to occupy two sides of the subpixels or may occupy all four sides.

According to the fifth embodiment of the present invention, the red, green, and blue quantum bars 130R, 130G, and 130B are positioned between the first electrode 121 and the second electrode 125 formed in the vertical direction. The first electrode 121 and the second electrode 125 may be formed of a metal having transparency. Specifically, the metal having transparency may be selected from ITO, IZO, ITZO, and the like, but is not limited thereto. The first electrode 121 and the second electrode 125 may be formed by a deposition method, but are not limited thereto.

The first electrode 121 and the second electrode 125 are formed adjacent to sidewalls of the partitions 135 positioned on the first substrate 120a. In contrast, the first electrode 121 and the second electrode 125 are formed to contact sidewalls of the barrier ribs 135 disposed on the first substrate 120a. The first electrode 121 and the second electrode 125 are formed to face each other. Red, green, and blue quantum bars 130R, 130G, and 130B are formed between the first electrode 121 and the second electrode 125.

The power supply controller 160 supplies a voltage or a current to the first electrode 121 and the second electrode 125 through wires formed on the first substrate 120a. The power supply controller 160 supplies voltages or currents of different levels to the first electrode 121 and the second electrode 125. For example, the power supply controller 160 may supply a positive voltage to the first electrode 121 and a negative voltage to the second electrode 125.

On the other hand, in the present invention has been described by distinguishing the features of each structure in the first to fifth embodiments. However, the present invention can improve the optical characteristics and the process characteristics of the flat panel display by combining the first to fifth embodiments. In addition, various technical effects may be obtained by combining and combining some components of the first to fifth embodiments of the present invention with the display panels constituting the organic light emitting display, the liquid crystal display, or the electrophoretic display.

The present invention has the effect of improving the half width of the emission spectrum of red, green, and blue generated by quantum bars to the same or the same level, and to provide a flat panel display device capable of improving color purity with respect to blue. In addition, the present invention has the effect of providing a flat panel display device having a structure that can improve the light emission characteristics of the quantum bar and can easily form it.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms without changing the technical spirit or essential features of the present invention by those skilled in the art to which the present invention pertains. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. In addition, all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

120a: first substrate 120b: second substrate
130: quantum rod 110: light source
CFB: Color Filter BM: Black Matrix
135: partitions 160: power supply control unit
121: first electrode 125: second electrode

Claims (12)

First substrate;
A second substrate spaced apart from the first substrate;
A light source unit disposed on a rear surface of the first substrate to emit light;
A quantum bar disposed between the first substrate and the second substrate and emitting red, green, and blue light by light emitted from the light source unit;
A red subpixel including a quantum bar emitting red light, a green subpixel including a quantum bar emitting green light, and a blue subpixel including a quantum bar emitting blue light. Subpixels; And
A blue color filter disposed only within an area of the blue subpixel,
The quantum bar is disposed between the first electrode and the second electrode disposed in the vertical direction adjacent to one side and the other side of the partition walls formed in the vertical direction on the first substrate to separate the boundary area between the subpixels. Flat Panel Display. delete The method of claim 1,
The blue color filter
And a flat panel display formed on an inner surface of the second substrate facing the first substrate. The method of claim 1,
The blue color filter
And a flat panel display formed on the insulating film on the quantum bar. The method of claim 1,
And a black matrix disposed on an inner surface of the second substrate facing the first substrate and separating a boundary area between the sub-pixels. The method of claim 1,
The quantum rod is
When the light is provided from the light source unit generates polarized light,
And no light is generated when voltage or current is supplied to the quantum bars. delete delete delete The method of claim 1,
The quantum rod is
Flat panel display device characterized in that arranged in the horizontal direction. delete The method of claim 1,
The first electrode and the second electrode
And a flat panel display device positioned on an inner surface of the second substrate facing the first substrate and corresponding to a black matrix that divides a boundary area between the sub-pixels.

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