Color Conversion Panel

Abstract

A color conversion panel includes a substrate and a color conversion layer. The substrate is combined with a plurality of spaced light sources. The color conversion layer is spaced apart from or closely combined with the substrate, and the color conversion layer includes a color conversion pixel partition wall and a color conversion pixel, the color conversion pixel partition wall is used to separate the light sources spatially in units of pixels while the light sources are built in, and the color conversion pixels are inserted into the partition space of the color conversion pixel partition wall. The color conversion pixel has a larger area than the light source.

Description

Technical Field

[0001] The present invention relates to a display device, and more particularly, to a color conversion panel with improved color conversion efficiency. Background Art

[0002] A flat panel display device is one of the widely used display devices. A flat panel display device is a display device including pixels having specific colors to generate and display desired colors.

[0003] Liquid crystal display devices use a color conversion panel to form colors. However, when light emitted from a backlight source having a white color passes through red, green, and blue color filters, light of a specific wavelength is absorbed and light of a specific wavelength is transmitted to display a desired color. However, when the transmitted light is viewed with respect to the backlight that generates the light, a large amount of loss may occur due to absorption, transmission, etc. Research is currently being actively conducted to minimize these losses.

[0004] Figure 1a to Figure 1c are plan views and assembled / separated cross-sectional views showing a color conversion panel according to the related art.

[0005] like Figure 1a As shown, the existing color conversion panel may include a substrate 100, a light source 200, a partition wall 300, a color conversion pixel 400, and the like.

[0006] exist Figure 1a to Figure 1c In the existing color conversion panel, the substrate 100 is used as a substrate for supporting the light source 200 and the color conversion pixel partition wall 300. The color conversion pixel partition wall 300 provides a space for separating and embedding the color conversion pixel 400. And, when the color conversion pixel 400 receives blue light from the light source 200, the blue light incident on the pixel can be maintained or changed into red light, green light or blue light and then emitted. Here, in the existing color conversion panel, the color conversion pixel 400 has the same area as the light source 200.

[0007] However, the aperture ratio, color conversion efficiency, etc. may vary according to various variables between light source 200 and color conversion pixel 400. Therefore, the related art color conversion panel has deficiencies in minimizing light loss through optimization of light source 200 and color conversion pixel 400. Summary of the invention

[0008] Technical issues

[0009] In order to solve the problems of the prior art, the present invention provides a color conversion panel capable of minimizing light loss and maximizing color conversion efficiency by optimizing between a light source and color conversion pixels.

[0010] Technical Solution

[0011] The color conversion panel of the present invention for achieving this object may be configured to include a substrate and a color conversion layer.

[0012] The substrate may incorporate a plurality of spaced apart light sources.

[0013] The color conversion layer may be spaced apart from or closely combined with the substrate. The color conversion layer may include a color conversion pixel partition wall and a color conversion pixel. The color conversion pixel partition wall may be used to separate the light source spatially in units of pixels while the built-in light source is used. The color conversion pixel may be inserted into the partition space of the color conversion pixel partition wall. The color conversion pixel may have a larger area than the light source.

[0014] In the color conversion panel of the present invention, the area of ​​the color conversion pixel may be 1.5 to 10 times the area of ​​the light source.

[0015] In the color conversion panel of the present invention, the area of ​​the color conversion pixel may be 2.93 to 8.75 times the area of ​​the light source.

[0016] In the color conversion panel of the present invention, the ratio of the width to the length of the color conversion pixel may be 1.38 to 1.75.

[0017] In the color conversion panel of the present invention, when the light source and the color conversion pixel are configured to be spaced apart, the spacing distance between the light source and the color conversion pixel can be configured to be 50 to 170 μm.

[0018] In the color conversion panel of the present invention, the color conversion pixels may include scattering particles.

[0019] The color conversion panel of the present invention may further include a color filter layer spaced apart from or closely coupled to the color conversion layer and coupled in the light emission direction.

[0020] In the color conversion panel of the present invention, the color filter layer may include color filter pixel partition walls and color filter pixels. The color filter pixel partition walls may be formed on the color conversion pixel partition walls. The color filter pixels may be inserted between the color filter pixel partition walls.

[0021] In the color conversion panel of the present invention, the thickness of the color filter pixel may be configured to be 5% to 30% of the thickness of the color conversion pixel.

[0022] In the color conversion panel of the present invention, the color conversion pixel may have a thickness of 5 to 20 μm.

[0023] In the color conversion panel of the present invention, the color conversion pixel partition walls and the color filter pixel partition walls may be separate types that are respectively formed separately and stacked.

[0024] In the color conversion panel of the present invention, the color conversion pixel partition wall and the color filter pixel partition wall may be formed simultaneously as an integral unit.

[0025] Effects of the Invention

[0026] According to the color conversion panel of the present invention having such a structure, by making the area of ​​the color conversion pixel larger than the area of ​​the light source (preferably 1.5 to 10 times), the color of the light emitted from the light source is converted to the maximum extent in the color conversion pixel, thereby maximizing the conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1a to Figure 1c are plan views and assembled / separated cross-sectional views showing a color conversion panel according to the related art.

[0028] Figure 2a to Figure 2c are a plan view and an assembled / separated cross-sectional view showing a color conversion panel according to the present invention. DETAILED DESCRIPTION

[0029] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0030] Figures 2a to 2c are a plan view and an assembled / separated cross-sectional view showing a color conversion panel according to the present invention.

[0031] like Figure 2a to Figure 2c As shown, the color conversion panel according to the present invention may include a substrate 100, a light source 200, a color conversion pixel partition wall 310, a color conversion pixel 410, and the like.

[0032] The substrate 100 is used to support the light source 200, the color conversion pixel partition wall 310, the color conversion pixel 410, etc., and is made of glass or plastic material, for example, a material selected from the group consisting of polyacrylate, polymethacrylate (e.g., PMMA), polyimide, polyamide, polyamic acid, polyvinyl alcohol, polyolefin (e.g., PE, PP), polystyrene, polynorbornene, polymaleimide, polyazobenzene, polyester (e.g., PET, PBT), polyarylate, polyphthalimide, polyphthalamide, polyethylene cinnamate, polycinnamate, coumarin polymer, chalcone polymer, aromatic acetylene polymer, phenylmaleimide copolymer, copolymers thereof, and blends thereof can be used.

[0033] The light source 200 may provide blue light (or white light) to the color conversion pixel 410. The light source 200 may be a backlight unit in an array form, that is, the light source 200 is recessed in the substrate 100 or protrudes from the upper surface and is arranged to be spaced apart. The light source may be an organic light emitting diode or a light emitting diode. When a light emitting diode is used, it may have a horizontal chip, a vertical chip, a flip chip, etc. The wavelength range of the emitted blue light may be from 430nm to 470nm.

[0034] The color conversion pixel partition wall 310 may be configured to be open in a direction away from the substrate 100 while the light source 200 is built on the substrate 100. The color conversion pixel partition wall 310 may spatially separate and space the light source 200 and the color conversion pixel 410 in units of pixels. The color conversion pixel partition wall 310 may constitute a color conversion layer together with the color conversion pixel 410. The color conversion pixel partition wall 310 may use a photosensitive composition including an acrylic or epoxy polymer. The color conversion pixel partition wall 310 may have a patterned structure through a photolithography process.

[0035] The color conversion pixel partition wall 310 may be formed to have a thickness of, for example, 5 to 20 μm.

[0036] The color conversion pixel partition wall 310 may have various opening shapes, and may have, for example, a circular, elliptical, triangular, or rectangular opening.

[0037] The color conversion pixel 410 may be inserted into the color conversion pixel partition wall 310 while covering the light source 200 on the substrate 100. The color conversion pixel 410 may have the same thickness as the color conversion pixel partition wall 310, for example, 5 to 20 μm.

[0038] The color conversion pixel 410 may include a color conversion member that converts the color of the incident light. The color conversion member may include a quantum dot. When irradiated with light of a wavelength greater than the band gap of the quantum dot, the quantum dot absorbs the incident light and enters an excited state, and then may drop to a ground state while emitting light of a specific wavelength. In this case, the quantum dot emits light of a wavelength corresponding to the band gap. The quantum dots may have different emission wavelengths, depending on their size. The smaller the quantum dot, the shorter the wavelength of light that can be emitted. For example, when light (e.g., blue light) is incident from the outside, the color conversion pixel 322 may emit red light with a wavelength of 620nm to 670nm, green light with a wavelength of 520nm to 570nm, or emit the incident blue light as is without color conversion.

[0039] The quantum dots may be selected from II-VI compounds, III-V compounds and IV-VI compounds, IV elements, IV compounds and combinations thereof, and alloys thereof. The alloys may include alloys of the above compounds and transition metals.

[0040] Group II-VI compounds include: CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgS Te, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgS Te, HgZnSeS, HgZnSeTe, HgZnSTe, etc. Group III-V compounds include GaN, GaP, GaAs, AlN, AlP, AlAs, InN, InP, InAs, GaNP, GaNAs, GaPAs, AlNP, AlNAs, Al PAs, InNP, InNAs, InPAs, GaAlNP, GaAlNAs, GaAlPAs, GaInNP, GaInNAs, GaInPAs, InAlNPs, InAlNAs, InAlPAs, etc. Group IV-VI compounds include SbTe, etc.

[0041] The color conversion pixel 410 may include scattering particles. The scattering particles scatter the light incident to the color conversion pixel 410 so as to make the front brightness and the side brightness of the emitted light uniform. The scattering particles may be inorganic oxide particles, organic particles, or a combination thereof, such as BiFeO3, Fe2O3, WO3, TiO2, SiC, BaTiO3, ZnO, ZrO2, ZrO, Ta2O5, MoO3, TeO2, Nb2O5, Fe3O4, V2O5, Cu2O, BP, Al2O3, In2O3, SnO2, Sb2O3, ITO, or a combination thereof.

[0042] The color conversion pixels 410 may include color filter pigments. In this case, the color conversion panel may include only the color conversion pixels without the color filter pixels.

[0043] The color conversion pixel 410 may have a larger area than the light source 200 .

[0044] Table 1 below shows the experimental results of stacking the red conversion pixel 410 on the blue light source 200 having the same size. The experiment was performed while changing the area while maintaining the same thickness. In the experiment, the blue light source 200 was made to emit light with a power consumption of 30 mW. In the experiment, the area was set to a size of 80 μm in width and 100 μm in length (area of ​​8000 μm 2 ). In the experiment, the color conversion pixel 410 stacked on the top was spaced 150 μm from the blue light source 200. In the experiment, the area of ​​the color conversion pixel 410 was changed based on the same size of 80 μm in width and 100 μm in length as the area of ​​the blue light source 200. In this state, the following Table 1 shows the brightness of the red light emitted from the red color conversion pixel 410 (brightness measured in a total of 100 color conversion pixels arranged 10 left and right and 10 up and down, cd / mm 2 ) results.

[0045]

Table 1

[0046]

[0047] As shown in the above Table 1, first, when the area ratio (area of ​​the color conversion pixel / area of ​​the light source, %) decreases, the brightness of the red light emitted from the red conversion pixel 410 (ie, brightness per unit area) decreases.

[0048] Next, it can be confirmed that when the area ratio reaches 1.5 times, the red light brightness (2.32 cd / mm 2 ) and the brightness when the area ratio is 1 (1.43cd / mm 2 ) has increased by nearly 60% compared to the previous year.

[0049] Third, it can be confirmed that when the area ratio exceeds 1.5 times, the brightness of the red light converted by the red conversion pixel 410 increases as the area of ​​the color conversion pixel 410 increases. However, when the area ratio is about 7 times, the brightness of the red light stagnates. When the area ratio is higher than this, the brightness of the red light decreases.

[0050] In addition, as the area ratio increases from 1.5 times to 4 times, the brightness of the red light increases rapidly. However, it is also confirmed that in the range of the area ratio of 4 to 10 times, the brightness of the red light increases slowly or decreases.

[0051] Based on the above experimental results, considering the industry situation that a significant improvement in color conversion efficiency is based on an increase of more than two times in red light brightness, it would be technically meaningful to set the area ratio of 1.5 times as the lower limit of the area ratio.

[0052] When the area ratio exceeds about 8 times, the increase in the brightness of red light stops, and when it reaches 10 times while decreasing, the brightness of red light decreases to 2 times. Therefore, an area ratio exceeding 10 times is meaningless in terms of color conversion efficiency. An area ratio exceeding 10 times only leads to an increase in manufacturing cost due to the consumption of materials constituting the color conversion pixels. Therefore, it is technically meaningful to set the area ratio of 10 times as the upper limit value of the area ratio.

[0053] As the area ratio increases from 1.5 times to 4 times, the brightness of red light increases rapidly. However, in the range where the area ratio is 4 times or more, the brightness of red light increases slowly or decreases. Therefore, considering the cost increase caused by the enlargement of the color conversion pixel, the area ratio of 4 times can also be used as a new upper limit value of the area ratio to give meaning.

[0054] On the other hand, sometimes the brightness is 3cd / mm 2 The above situation gives technical significance. According to this standard, the area ratio of 2.93 to 8.75 may have technical significance. In this case, it can be confirmed that the width / length ratio of the color conversion pixel is in the range of 1.385 to 1.750.

[0055] Table 2 below shows the experimental results of stacking the red color conversion pixel 410 on the blue light source 200 of the same size. In the experiment, the area ratio of the blue light source 200 to the red color conversion pixel 410 was the same. In the experiment, the separation distance between the blue light source 200 and the red color conversion pixel 410 was changed. At this time, Table 2 below shows the brightness of the red light emitted from the red color conversion pixel 410 (brightness measured in a total of 100 color conversion pixels arranged 10 left and right and 10 up and down, cd / mm 2 ). Here, the blue light source 200 emits light with a power consumption of 30 mW. The blue light source 200 is manufactured to have a width of 80 μm and a length of 100 μm (an area of ​​8000 μm 2 The red conversion pixel 410 has a width of 100 μm and a length of 120 μm (the area is 12000 μm). 2 ).

[0056]

Table 2

[0057]

[0058]

[0059] As shown in Table 2 above, in the interval where the red light brightness is greater than 2, the separation distance between the blue light source 200 and the red conversion pixel 410 is shown to be 50 to 170 μm. Therefore, in the present invention, limiting the separation distance between the blue light source 200 and the red conversion pixel 410 to 50 to 170 μm can be given technical significance.

[0060] In the color conversion panel according to the present invention, a color filter layer may be further formed on the color conversion layer composed of the color conversion pixel partition walls 310 and the color conversion pixels 410 .

[0061] The color filter layer may be formed to be spaced apart from or closely coupled to the color conversion layer in the light emission direction.

[0062] The color filter layer may include a color filter pixel partition wall and a collector color filter pixel. The color filter pixel partition wall may be formed on the color conversion pixel partition wall 310. The color filter pixel may be formed within the color filter pixel partition wall on the color conversion pixel 410.

[0063] The color filter pixel partition wall can be formed separately and stacked with the color conversion pixel partition wall 310, that is, it can be configured as a separate type. The color filter pixel partition wall can be formed at the same time as the color conversion pixel partition wall, that is, it can be configured as an integrated type. In the case of the integrated type, the color conversion pixel partition wall 310 and the color filter pixel partition wall can constitute one partition wall, that is, an integrated partition wall.

[0064] The color filter pixel may be a red light filter pixel that transmits red light and absorbs green light and blue light to emit only red light. The color filter pixel may be a green light filter pixel that transmits green light and absorbs red light and blue light to emit only green light. Alternatively, the color filter pixel may be a blue light filter pixel that transmits blue light and absorbs red light and green light to emit only blue light.

[0065] The thickness of the color filter pixel may be 5% to 30% of the thickness of the color conversion pixel 410 .

[0066] In the above, the present invention has been described by embodiments, which are intended to illustrate the present invention. Those skilled in the art will be able to change or modify these embodiments in other forms. However, since the scope of the present invention is limited by the appended claims, these changes or modifications can be interpreted as being included within the scope of the present invention.

[0067] [Description of Reference Numerals]

[0068] 100: Substrate 200: Light source

[0069] 300, 310: color conversion pixel partition walls 400, 410: color conversion pixels.

Claims

1. A color conversion panel, comprising: a substrate incorporating a plurality of spaced-apart light sources; as well as a color conversion layer which is spaced apart from or closely combined with the substrate, and the color conversion layer comprises a color conversion pixel partition wall and a color conversion pixel, the color conversion pixel partition wall is used to spatially separate the light source in units of pixels while embedding the light source, and the color conversion pixel is inserted into the partition space of the color conversion pixel partition wall, wherein the color conversion pixel is 1.5 to 10 times the area of ​​the light source, wherein in an area ratio experiment, red conversion pixels are stacked on a 30 mW blue light source at 150 μm intervals, and changes in the brightness of red light emitted from the red conversion pixels are measured while changing the size and area of ​​the red conversion pixels, and The spacing distance between the light source and the color conversion pixel is 50 to 170 μm, wherein in the spacing distance experiment, the red conversion pixel is stacked on a 30 mW blue light source and the change in the brightness of the red light emitted from the red conversion pixel is measured while changing the spacing distance.

2. The color conversion panel according to claim 1, wherein: The area of ​​the color conversion pixel is 2.93 to 8.75 times the area of ​​the light source.

3. The color conversion panel according to claim 1, wherein: The color conversion pixel has a width to length ratio of 1.38 to 1.

75.

4. The color conversion panel according to claim 1, wherein: The color conversion pixels include scattering particles.

5. The color conversion panel according to any one of claims 1 to 4, further comprising: A color filter layer is spaced apart from or closely combined with the color conversion layer and combined in the light emission direction.

6. The color conversion panel according to claim 5, wherein: The color filter layer comprises: a color filter pixel partition wall formed on the color conversion pixel partition wall; and Color filter pixels are inserted between the color filter pixel partition walls.

7. The color conversion panel according to claim 6, wherein: The thickness of the color filter pixel is 5% to 30% of the thickness of the color conversion pixel.

8. The color conversion panel according to claim 7, wherein: The color conversion pixel has a thickness of 5 to 20 μm.

9. The color conversion panel according to claim 6, wherein: The color conversion pixel partition wall and the color filter pixel partition wall are of a separate type that are separately formed and stacked.

10. The color conversion panel according to claim 6, wherein: The color conversion pixel partition wall and the color filter pixel partition wall are integrally formed at the same time.

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