KR20200010008A - Display and fabricating method of the same - Google Patents

Abstract

Provided is a display. The display comprises: a color filter layer including a first color filter passing light in a first wavelength band, a second color filter passing light in a second wavelength band, and a third color filter passing light in a third wavelength band; a light source layer emitting white light including the light in the third wavelength band and the light in the fourth wavelength band; and a wavelength conversion layer disposed between the color filter layer and the light source layer to convert the light in the fourth wavelength band into the light in the first wavelength band.

Description

Display and manufacturing method thereof {Display and fabricating method of the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display and a method for manufacturing the same, and more particularly, to a display and a method for manufacturing the same having improved color purity through wavelength change.

The color filter used in the liquid crystal display device is used to implement a color image in the display device. The color filter may be manufactured by coating, curing, and patterning a pigment on a base substrate by various methods. . The color filter is formed of three pixel portions of red, green, and blue on a transparent substrate such as glass, and color filters used in an image display device or a solid state image pickup device are typically red (R), green (G), and It has a coloring pattern of three primary colors of blue (B), and serves to color the light passing through or to separate it into three primary colors. Pigments displaying red, green, and blue are composed of fine particles, that is, pigments, and these pigments are used alone to obtain color display characteristics of a desired region. , Blue will be displayed.

In recent years, the development of large-screen and high-definition technology for liquid crystal displays has progressed, and their use has been greatly expanded from notebook displays to desktop monitors and television monitors. In such a situation, color filters used for liquid crystal displays and the like are required to have high color purity. In particular, it is important to satisfy this required characteristic in a high definition display that enables high quality image display. Accordingly, various techniques for improving color purity have been researched and developed.

One technical problem to be solved by the present invention is to provide a display with improved color purity and a method of manufacturing the same.

Another technical problem to be solved by the present invention is to provide a display and a method of manufacturing the minimized reduction in luminance.

Another technical problem to be solved by the present invention is to provide a display and a method of manufacturing the simplified process.

The technical problem to be solved by the present invention is not limited to the above.

To solve the above technical problem, the present invention provides a display.

According to one embodiment, the display includes a first color filter for passing light in a first wavelength band, a second color filter for passing light in a second wavelength band, and a third color filter for passing light in a third wavelength band. A color filter layer, a light source layer that emits white light including light of the third wavelength band and light of the fourth wavelength band, and disposed between the color filter layer and the light source layer, and the light of the fourth wavelength band of the first wavelength band. It may include a wavelength conversion layer for converting to light.

According to an embodiment, the energy of the first wavelength band may be lower than the energy of the fourth wavelength band.

According to an embodiment of the present disclosure, the light source layer may include an LED chip generating light in the third wavelength band and a phosphor provided on one side of the LED chip and generating light in the fourth wavelength band.

According to an embodiment, the first wavelength band includes a red wavelength band, the second wavelength band includes a green wavelength band, and the third wavelength band includes a blue wavelength band. The fourth wavelength band may include a yellow wavelength band.

According to one embodiment, the spectrum of the light passing through the wavelength conversion layer, compared with the spectrum of the white light emitted from the light source layer, the peak of the fourth wavelength band is reduced, the peak of the first wavelength band May include increasing.

According to one embodiment, the wavelength conversion layer, may include disposed adjacent to the color filter layer.

According to one embodiment, the display is disposed on the liquid crystal layer disposed between the wavelength conversion layer and the light source layer, the first polarizing layer disposed between the liquid crystal layer, and the light source layer, and the color filter layer. It may further include a second polarizing layer.

According to an embodiment, the light source layer may include a first light generating layer generating light in the third wavelength band and a second light generating layer stacked on the first light generating layer and generating light in the fourth wavelength band. It may include.

In order to solve the above technical problem, the present invention provides a display manufacturing method.

According to an embodiment, the display manufacturing method may include preparing a light source layer emitting white light, and passing a light of a first color filter and a second wavelength band passing light of a first wavelength band on the light source layer. And forming a color filter layer including a second color filter and a third color filter passing light of a third wavelength band, wherein after the light source layer preparation step, before the color filter layer forming step, the light source layer exits. The method may further include forming a wavelength conversion layer for converting light of a fourth wavelength band among white light into light of the first wavelength band.

According to an embodiment, the wavelength conversion layer forming step and the color filter layer forming step may be performed continuously.

According to an embodiment of the present disclosure, the forming of the wavelength conversion layer and the forming of the color filter layer may include performing the same process.

According to an embodiment, the forming of the color filter layer may not include a patterning process.

A display according to an embodiment of the present invention includes a first color filter for passing light in a first wavelength band, a second color filter for passing light in a second wavelength band, and a third color filter for passing light in a third wavelength band. A color filter layer disposed between the color filter layer and the light source layer, the light source layer emitting white light including the light of the third wavelength band and the light of the fourth wavelength band, and the light of the fourth wavelength band, It may include a wavelength conversion layer for converting the light of the wavelength band. Accordingly, a display not only with improved color purity but also with reduced luminance can be provided.

1 is a diagram illustrating a display according to an exemplary embodiment of the present invention.
2 is a view showing a light source layer included in a display according to an exemplary embodiment of the present invention.
3 and 4 are graphs comparing wavelength changes of light passing through a wavelength conversion layer included in a display according to an exemplary embodiment of the present invention.
5 is a diagram illustrating a color filter layer included in a display according to an exemplary embodiment of the present invention.
6 is a flowchart illustrating a method of manufacturing a display according to an exemplary embodiment of the present invention.
7 illustrates a display according to a modified example of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical idea of the present invention is not limited to the exemplary embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed contents are thorough and complete, and that the spirit of the present invention to those skilled in the art can fully convey.

In the present specification, when a component is mentioned as being on another component, it means that it may be formed directly on the other component or a third component may be interposed therebetween. In addition, in the drawings, the thicknesses of films and regions are exaggerated for effective explanation of technical contents.

In addition, in various embodiments of the present specification, terms such as first, second, and third are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. Thus, what is referred to as the first component in one embodiment may be referred to as the second component in other embodiments. Each embodiment described and illustrated herein also includes its complementary embodiment. In addition, the term 'and / or' is used herein to include at least one of the components listed before and after.

In the specification, the singular encompasses the plural unless the context clearly indicates otherwise. In addition, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, element, or combination thereof described in the specification, and one or more other features, numbers, steps, configurations. It should not be understood to exclude the possibility of the presence or the addition of elements or combinations thereof. In addition, the term "connection" is used herein to mean both indirectly connecting a plurality of components, and directly connecting.

In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a view showing a display according to an embodiment of the present invention, Figure 2 is a view showing a light source layer included in the display according to an embodiment of the present invention, Figures 3 and 4 according to an embodiment of the present invention 5 is a graph comparing wavelength changes of light passing through a wavelength conversion layer included in a display, and FIG. 5 is a view illustrating a color filter layer included in a display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the display 100 according to an exemplary embodiment of the present invention includes a light source layer 110, a first polarization layer 120, a liquid crystal layer 130, a wavelength conversion layer 140, and a color filter layer 150. , And the second polarization layer 160. In describing the display 100 according to the above embodiment, a liquid crystal display (LCD) is described as an example, but may be applied to not only an LCD but also other types of displays such as an OLED. The display 100 applied to the OLED is described below. In addition, in the description of the display 100 according to the above embodiment, the terms of the first to fourth wavelength bands are the red wavelength band, the green wavelength band, the blue wavelength band, and the yellow ( Yellow) means the wavelength range. Hereinafter, each configuration of the display 100 according to the embodiment applied to the LCD will be described.

1 and 2, the light source layer 110 is provided with an LED chip 112 for generating light of the third wavelength band and one side of the LED chip 112 and has light of the fourth wavelength band. It may include a phosphor (F) to generate. Accordingly, the light source layer 110 may emit white light including light in the third wavelength band and light in the fourth wavelength band. That is, the light source layer 110 may generate white light through the blue LED and the yellow phosphor. Accordingly, the white light may include light in a blue wavelength band and light in a yellow wavelength band. The white light generated by the light source layer 110 may be emitted toward the first polarization layer 120.

The first polarization layer 120 and the liquid crystal layer 130 may be sequentially disposed on the light source layer 110. That is, the first polarization layer 120 may be disposed on the light source layer 110, and the liquid crystal layer 130 may be disposed on the first polarization layer 120. The first polarization layer 120 may polarize the white light emitted from the light source layer 110. The polarized white light may be provided to the liquid crystal layer 130. The liquid crystal layer 130 may maintain the polarization direction or rotate the polarized white light according to the arrangement of the liquid crystals.

1, 3, and 4, the wavelength conversion layer 140 may be disposed on the liquid crystal layer 130. The wavelength conversion layer 140 may convert light of the fourth wavelength band into light of the first wavelength band. In this case, the energy of the first wavelength band may be lower than the energy of the fourth wavelength band. That is, the wavelength conversion layer 140 may convert light of a yellow wavelength band into light of a red wavelength band. Accordingly, the spectrum of the light passing through the wavelength conversion layer 140 is compared with the spectrum of the white light emitted from the light source layer 110, and the peak of the fourth wavelength band is decreased. The peak of the first wavelength band may increase.

For example, the spectrum of the white light emitted from the light source layer 110 may appear as shown in FIG. 3, and the spectrum of the light passing through the wavelength conversion layer 140 may appear as shown in FIG. 4. In this case, as light passes through the wavelength conversion layer 140, the peak of the fourth wavelength band (yellow wavelength band) decreases from A to C, and the peak of the first wavelength band (red wavelength band) is Can increase from B to D.

As described above, as the wavelength conversion layer 140 converts the light of the fourth wavelength band into the light of the first wavelength band, color purity of the display 100 according to the embodiment may be improved. Can be.

For example, the wavelength conversion layer 140 may be formed of at least one material of a phosphor, a quantum dot, a light emitting organic molecule, and / or a light emitting inorganic molecule that converts light of the fourth wavelength band into light of the first wavelength band. have.

More specifically, in the case of white light generated through the blue LED chip and the yellow phosphor, as shown in FIG. 3, one peak may be displayed in a wide range from the green wavelength band to the red wavelength band. When color is implemented through light representing such a wide range of peaks, color purity may be degraded. However, the display 100 according to the embodiment may change the light of the fourth wavelength band into the light of the first wavelength band through the wavelength conversion layer 140. Accordingly, the light passing through the wavelength conversion layer 140 has two peaks from the green wavelength band to the red wavelength band as shown in FIG. 4, and the width of the wavelength is also increased. Can be reduced. As a result, the display 100 according to the embodiment converts the light of the yellow wavelength band included in the white light generated through the blue LED chip and the yellow phosphor into the red wavelength through the wavelength conversion layer 140. Therefore, a clear peak can be produced and color purity can be improved.

In addition, in the display 100 according to the embodiment, as the wavelength conversion layer 140 converts the light of the fourth wavelength band into the light of the first wavelength band, reduction of brightness may be minimized. . On the contrary, when the color purity is improved by absorbing light in the fourth wavelength band, as a part of the white light generated from the light source layer 110 is absorbed, a problem may occur in that luminance is reduced.

1 and 5, the color filter layer 150 may be disposed on the wavelength conversion layer 140. The color filter layer 150 may receive the light whose wavelength is converted from the wavelength conversion layer 140 to implement a color of an image to be finally formed.

According to an embodiment, the color filter layer 150 may include a first color filter 152, a second color filter 154, and a third color filter 156. The first color filter 152 may pass light in the first wavelength band and block light in a wavelength band except for the light in the first wavelength band. That is, the first color filter 152 may pass light in the red wavelength band and block light in the color wavelength band except for the light in the red wavelength band. The second color filter 154 may pass light in the second wavelength band and block light in the wavelength band except for the light in the second wavelength band. That is, the second color filter 154 may pass light in the green wavelength band and block light in the color wavelength band except for the light in the green wavelength band. The third color filter 156 may pass light in the third wavelength band and block light in the wavelength band except for the light in the third wavelength band. That is, the third color filter 156 may pass light in the blue wavelength band and block light in the color wavelength band except for the light in the blue wavelength band.

The second polarization layer 160 may be disposed on the color filter layer 150. The second polarization layer 160 may pass a portion of the light passing through the color filter layer 150 and block a portion of the light. According to an embodiment, the polarization direction of the second polarization layer 160 may be orthogonal to the polarization direction of the first polarization layer 120. As light passes through the second polarization layer 160, a final image may be implemented. That is, the light generated by the light source layer 110 is the first polarization layer 120, the liquid crystal layer 130, the wavelength variability layer 140, the color filter layer 150, and the second polarization. As the layers 150 pass sequentially, images may be implemented.

The display according to the embodiment of the present invention, the first color filter 152 for passing the light of the first wavelength band, the second color filter 154 and the light of the third wavelength band to pass the light of the second wavelength band. The color filter layer 150 including the third color filter 154 passing through the light source, the light source layer 110 emitting white light including light in the third wavelength band and light in the fourth wavelength band, and the The wavelength conversion layer 140 may be disposed between the color filter layer 150 and the light source layer 110 and convert the light of the fourth wavelength band into the light of the first wavelength band. Accordingly, a display not only with improved color purity but also with reduced luminance can be provided.

The display according to the embodiment of the present invention has been described above. Hereinafter, a method of manufacturing a display according to an embodiment of the present invention will be described.

6 is a flowchart illustrating a method of manufacturing a display according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the method for manufacturing a display according to the embodiment may include preparing a light source layer (S100), forming a wavelength conversion layer (S200), and forming a color filter layer (S300). In describing the method of manufacturing the display according to the embodiment, the display according to the embodiment described with reference to FIGS. 1 to 5 may be an example. Hereinafter, each step will be described.

In the light source layer preparation step (S100), a light source layer that emits white light may be prepared. According to an embodiment of the present disclosure, the preparing of the light source layer (S100) may include preparing an LED chip and preparing a phosphor on one side of the LED chip. The LED chip may generate light in a third wavelength band. That is, the LED chip may generate light in the blue wavelength band. The fluorescent agent may generate light in a fourth wavelength band. That is, the fluorescent agent may generate light in the yellow wavelength band. As a result, the light source layer may generate white light through the LED chip in the blue wavelength band and the phosphor in the yellow wavelength band.

In the wavelength conversion layer forming step (S200), the wavelength conversion layer may be formed on the light source layer. The wavelength conversion layer may convert light in the fourth wavelength band into light in the first wavelength band. That is, the wavelength conversion layer may convert light of a yellow wavelength band into light of a red wavelength band. Like the wavelength conversion layer included in the display according to the embodiment described with reference to FIGS. 1 to 5, the wavelength conversion layer may improve the color purity of the display and minimize the decrease in luminance.

In the color filter layer forming step (S300), the color filter layer may be formed on the wavelength conversion layer. The color filter layer may include a first color filter through which light in a first wavelength band passes, a second color filter through which light in a second wavelength band passes, and a third color filter through which light in a third wavelength band passes.

According to one embodiment, the wavelength conversion layer forming step (S200), and the color filter layer forming step (S300) may be performed sequentially (sequentially). In addition, the wavelength conversion layer forming step S200 and the color filter layer forming step S300 may be performed in the same process. For example, the wavelength conversion layer and the color filter layer may be continuously formed through the same coating process. Accordingly, the wavelength conversion layer may be manufactured together with the color filter layer without any additional process in the existing LCD manufacturing process.

According to an embodiment, the color filter layer forming step S300 may not include a patterning process. That is, the display manufacturing method according to the embodiment may improve the color purity of the display without a patterning process for providing a QD (Quantum Dot) material to each of the first to third color filters.

More specifically, the conventional technology for improving the color purity of the LCD provides a QD material to each of the first to third color filters, thereby improving color purity through the QD material. In this case, in order to provide the QD material to the first to third color filters, a process of patterning the QD material to the first to third color filters is required in a display manufacturing process.

However, in the display manufacturing method according to the embodiment, since the color purity of the display can be improved by a simple method of forming the wavelength conversion layer, a complicated process such as a patterning process is omitted.

The display and manufacturing method thereof according to the embodiment of the present invention have been described above. Hereinafter, a display according to a modification of the present invention is described.

7 illustrates a display according to a modified example of the present invention.

Referring to FIG. 7, the display 200 according to a modified example of the present invention shows an example in which the technical idea of the present invention is applied to an organic light emitting diode (OLED) having a tandem structure. The tandem structure may refer to a structure in which two or more light emitting layers are connected in series. In this case, the charge generation layer may provide an interface of the individual light emission layers. It will be described in detail below.

The display 200 according to the modified example has a first electrode 220, a first light emitting layer 210a, a charge generating layer 280, a second light emitting layer 210b, and a second electrode in the y direction. 230, the wavelength conversion layer 250, and the color filter layer 260 may be stacked in this order. In this case, the first light emission layer 210a may include a first hole injection layer 211a, a first hole transport layer 212a, a first light emitting layer 213a, a first electron transport layer 214a, and a first electron. The injection layer 215a may be included. In addition, the second light emission layer 210b may include a second hole injection layer 211b, a second hole transport layer 212b, a second light emitting layer 213b, a second electron transport layer 214b, and a second electron injection layer. 215b.

The first hole injection layer 211a and the second hole injection layer 211b may perform a function of smoothly injecting holes. For example, the first and second hole injection layers 211a and 211b may include MTDATA (4,4 ', 4' '-tris (3-methylphenylphenylamino) triphenylamine), CuPc (copper phthalocyanine), PEDOT / PSS (poly 3,4-ethylenedioxythiphene, polystyrene sulfonate) and NPD (N, N-dinaphthyl-N, N'-diphenylbenzidine) may be made of at least one material, but is not limited thereto.

The first hole transport layer 212a and the second hole transport layer 212b may perform a function of smoothly transporting holes. For example, the first and second hole transport layers 212a and 212b may include NPD (N, Ndinaphthyl-N, N'-diphenylbenzidine) and TPD (N, N'-bis- (3-methylphenyl) -N, N '-bis- (phenyl) -benzidine), s-TAD and MTDATA (4,4', 4 "-Tris (N-3-methylphenyl-N-phenylamino) -triphenylamine) It is not limited to this.

The first electron transport layer 214a and the second electron transport layer 214b may transport electrons to the light exit layer. For example, the first and second electron transport layers 214a and 214b include Alq3, PBD, TAZ, spiro-PBD, BAlq, Liq (lithium quinolate), BMB-3T, PF-6P, TPBI, COT, and SAlq. It may be made of at least one material, but is not limited thereto.

The first electron injection layer 215a and the second electron injection layer 215b may inject electrons into the electron transport layer. For example, the first and second electron injection layers 215a and 215b may be made of at least one of Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro-PBD, BAlq, and SAlq. .

The first emission layer 213a may generate light in the third wavelength band. On the other hand, the second light emitting layer 213b may generate light in the fourth wavelength band. That is, the first light emitting layer 213a may generate light in the blue wavelength band, and the second light emitting layer 213b may generate light in the yellow wavelength band. Accordingly, the light emitted from each of the first emission layer 213a and the second emission layer 213b may be combined to generate white light. The first light emitting layer 213a and the second light emitting layer 213b may be composed of a first light emitting molecule 270a and a second light emitting molecule 270b, respectively.

The charge generation layer 280 may be located between the first emission layer 213a and the second emission layer 213b. The charge generating layer 280 adjusts the charge balance between the first light emitting layer 213a and the second light emitting layer 213b. The charge generation layer 280 may include an N-type charge generation layer and a P-type charge generation layer. The N-type charge generating layer may be formed of an organic layer doped with an alkali metal such as Li, Na, K, or Cs, or an alkaline earth metal such as Mg, Sr, Ba, or Ra, respectively. In addition, the P-type charge generating layer may be formed of an organic layer each containing a P-type dopant.

The wavelength conversion layer 250 and the color filter layer 260 may be sequentially disposed on the second electrode 230. The wavelength conversion layer 250 and the color filter layer 260 may be the same as the wavelength conversion layer and the color filter layer included in the display according to the embodiment described with reference to FIGS. 1 to 5. Accordingly, detailed description is omitted.

That is, the display 200 according to the modification, the light of the yellow wavelength band included in the white light generated through the first light emitting layer 213a and the second light emitting layer 213b, the wavelength conversion layer 250 By converting the wavelength into the red wavelength through, it is possible to reduce the width of the wavelength, thereby improving color purity and minimizing the reduction of luminance.

As mentioned above, although this invention was demonstrated in detail using the preferable embodiment, the scope of the present invention is not limited to a specific embodiment, Comprising: It should be interpreted by the attached Claim. In addition, those of ordinary skill in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

100: display
110: light source layer,
120: first polarization layer
130: liquid crystal layer
140: wavelength conversion layer
150: color filter layer
160: second polarization layer
210a, 210b: first light emitting layer and second light emitting layer
220: first electrode
230: second electrode
250: wavelength conversion layer
260: color filter layer

Claims (12)

A color filter layer including a first color filter passing light of a first wavelength band, a second color filter passing light of a second wavelength band, and a third color filter passing light of a third wavelength band;
A light source layer that emits white light including light in the third wavelength band and light in the fourth wavelength band; And
And a wavelength conversion layer disposed between the color filter layer and the light source layer and converting light in the fourth wavelength band into light in the first wavelength band.
According to claim 1,
Wherein the energy of the first wavelength band is lower than the energy of the fourth wavelength band.
According to claim 1,
The light source layer includes a LED chip for generating light in the third wavelength band and a phosphor provided on one side of the LED chip and generating light for the fourth wavelength band.
According to claim 1,
The first wavelength band includes a red wavelength band, the second wavelength band includes a green wavelength band, the third wavelength band includes a blue wavelength band, and the fourth wavelength band includes Display comprising a yellow wavelength band.
According to claim 1,
Compared with the spectrum of the white light emitted from the light source layer, the spectrum of the light passing through the wavelength conversion layer,
Wherein the peak of the fourth wavelength band is decreased and the peak of the first wavelength band is increased.
According to claim 1,
And the wavelength conversion layer is disposed adjacent to the color filter layer.
According to claim 1,
A liquid crystal layer disposed between the wavelength conversion layer and the light source layer;
A first polarization layer disposed between the liquid crystal layer and the light source layer; And
And a second polarizing layer disposed on said color filter layer.
According to claim 1,
Wherein said light source layer comprises a first light generating layer for generating light in said third wavelength band and a second light generating layer stacked on said first light generating layer and generating light in said fourth wavelength band.
Preparing a light source layer for emitting white light; And
A color filter layer including a first color filter passing light of a first wavelength band, a second color filter passing light of a second wavelength band, and a third color filter passing light of a third wavelength band on the light source layer; Including forming,
After the light source layer preparation step before the color filter layer forming step,
And forming a wavelength conversion layer for converting light of a fourth wavelength band from the white light emitted by the light source layer into light of the first wavelength band.
The method of claim 9,
And the color conversion layer forming step and the color filter layer forming step are performed continuously.
The method of claim 9,
Wherein the wavelength conversion layer forming step and the color filter layer forming step are performed in the same process.
The method of claim 9,
The forming of the color filter layer does not include a patterning process.

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