KR20110022970A - Display device - Google Patents

Display device Download PDF

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Publication number
KR20110022970A
KR20110022970A KR1020090080520A KR20090080520A KR20110022970A KR 20110022970 A KR20110022970 A KR 20110022970A KR 1020090080520 A KR1020090080520 A KR 1020090080520A KR 20090080520 A KR20090080520 A KR 20090080520A KR 20110022970 A KR20110022970 A KR 20110022970A
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KR
South Korea
Prior art keywords
light
color
transparent substrate
display device
display panel
Prior art date
Application number
KR1020090080520A
Other languages
Korean (ko)
Inventor
김종혁
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020090080520A priority Critical patent/KR20110022970A/en
Publication of KR20110022970A publication Critical patent/KR20110022970A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133621—Illuminating devices providing coloured light

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

A display device is disclosed. The display device includes a light source for emitting light of a first color; And a light conversion layer for converting the light of the first color into white light. The display device may convert the light of the first color into white light by using a light conversion layer having a very thin thickness. Accordingly, the display device reduces the light loss generated during the conversion and has an improved luminance.

Description

Display device {DISPLAY DEVICE}

An embodiment relates to a display device.

As information processing technology develops, display devices such as LCD, AMOLED and PDP are being used.

Among these display devices, the LCD does not emit light by itself, but changes the optical characteristics of the liquid crystal to display an image using ambient light or back light.

Embodiments provide a display device having improved luminance.

According to an exemplary embodiment, a display device may include a light source that emits light of a first color; And a light conversion layer for converting the light of the first color into white light.

According to an exemplary embodiment, a display device may include a light source that emits light of a first color; A light guide plate receiving light of a first color emitted from the light source; A display panel on the light guide plate; And a light conversion layer for converting the light of the first color into white light.

In the display device according to the exemplary embodiment, a light conversion layer for converting light of the first color emitted from the light source into white light is disposed on the inside of the display panel, the bottom surface of the display panel, or the top surface of the light guide plate. Therefore, the light of the first color is not converted to white light immediately after being emitted, but is sufficiently diffused and converted to white light.

Accordingly, the display device according to the exemplary embodiment is a light conversion layer having a very thin thickness, and converts light of the first color into white light. Therefore, the display device according to the embodiment can minimize the loss of light generated in the process of changing the light of the first color to white light.

That is, in order to convert the non-diffused first color light into white light, a light conversion layer such as a very thick fluorescent layer is required. However, the display device according to the present exemplary embodiment converts light of sufficiently diffused first color into white light, so that white light can be generated using a very thin light conversion layer.

Thus, the display device according to the embodiment has improved luminance.

In addition, the display panel may include a transparent substrate, the light source may emit light toward the side of the transparent substrate, and the light conversion layer may be disposed on an upper surface of the transparent substrate. Accordingly, the display device according to the embodiment can display a uniform image without using a light guide plate.

Therefore, the display device according to the embodiment is slimmer and can be easily manufactured at low cost.

In the description of the embodiments, it is described that each substrate, layer, region, wiring, or electrode is formed on or under the "on" of each substrate, layer, region, wiring, or electrode, etc. In the case, “on” and “under” include both being formed “directly” or “indirectly” through other components. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is a perspective view illustrating a liquid crystal display according to an embodiment. FIG. 2 is a cross-sectional view illustrating a cross section taken along line AA ′ in FIG. 1.

1 and 2, the liquid crystal display according to the embodiment includes a light emitting diode 10 and a liquid crystal panel 20.

The light emitting diodes 10 are disposed on side surfaces of the liquid crystal panel 20. The light emitting diode 10 is a light source for supplying light to the liquid crystal panel 20. The light emitting diode 10 generates light L1 having a first color and emits the light toward the liquid crystal panel 20. In more detail, the light emitting diode 10 emits the light L1 of the first color toward the side of the liquid crystal panel 20. That is, the light emitting diode 10 injects the light L1 of the first color into the liquid crystal panel 20.

The light emitting diode 10 may be, for example, a blue light emitting diode. The light L1 of the first color may be blue light. For example, the light L1 of the first color may have a dominant wavelength band of about 400 nm to about 500 nm. In more detail, the light L1 of the first color may have a dominant wavelength band of about 420 nm to about 480 nm.

Alternatively, the light emitting diodes 10 may be green or red light emitting diodes.

Alternatively, the light emitting diodes 10 may emit light by generating ultraviolet light instead of visible light. That is, the light emitting diodes 10 may emit ultraviolet light instead of visible light.

The liquid crystal panel 20 may have a plate shape. The liquid crystal panel 20 displays an image in pixel units by using the light L1 of the first color emitted from the light emitting diodes 10. The liquid crystal panel 20 includes a TFT substrate 100, a color filter substrate 200, and a liquid crystal layer 300.

The TFT substrate 100 includes a first transparent substrate 110, a light conversion layer 120, and a TFT layer 130.

The first transparent substrate 110 is transparent and is an insulator. The first transparent substrate 110 has a plate shape. The first transparent substrate 110 may be, for example, a glass substrate, a plastic substrate, or a quartz substrate.

The light conversion layer 120 is disposed on the first transparent substrate 110. In more detail, the light conversion layer 120 is disposed on the top surface of the first transparent substrate 110. The light conversion layer 120 may be coated on an upper surface of the first transparent substrate 110.

The light conversion layer 120 converts the light L1 of the first color into white light L2. For example, the light conversion layer 120 converts blue light into white light L2. That is, the light turning layer includes a light conversion material for converting the light L1 of the first color into white light L2.

Phosphor is mentioned as an example of the said light conversion material. In more detail, the light converting material may be a yellow phosphor. For example, the light conversion material may be a yttrium aluminum garnet (YAG) -based phosphor, a strontium silicate phosphor, or a terbium borate phosphor.

In addition to the phosphor, various materials capable of converting the color of light may be used as the light conversion material.

The TFT layer 130 is disposed on the light conversion layer 120. The TFT layer 130 includes components for applying an electric field to the liquid crystal layer 300 on a pixel area basis.

The TFT layer 130 may include a plurality of gate lines, a plurality of data lines, a plurality of thin film transistors, and a plurality of pixel electrodes.

The gate lines extend in parallel with each other in the first direction. The data lines extend in parallel with each other in a second direction crossing the first direction. In addition, the data lines cross the gate lines. The gate lines and the data lines cross each other to define a plurality of pixel regions.

The thin film transistors are disposed in an area where the gate line and the data line cross each other. The thin film transistors are disposed in the pixel regions, respectively.

The pixel electrodes are disposed in the pixel regions, respectively. The pixel electrodes are connected to the thin film transistors, respectively. Each of the pixel electrodes receives a data signal through the data lines by the operation of the thin film transistors.

The pixel electrodes are transparent, and an example of a material used as the pixel electrodes may include indium tin oxide (ITO) or indium zinc oxide (IZO).

The TFT substrate 100 may further include layers for improving optical characteristics of the white light L2. For example, the TFT substrate 100 may further include an optical layer such as a phase retardation layer for generating a phase difference, a polarization layer, and a diffusion layer for diffusing light passing therethrough.

In the present embodiment, the light conversion layer 120 is described as being interposed between the first transparent substrate 110 and the TFT layer 130, but is not limited thereto. That is, the light conversion layer 120 may be disposed in the TFT layer 130 or on the TFT layer 130. In addition, the light conversion layer 120 may be included in the color filter substrate 200.

The color filter substrate 200 is disposed on the TFT substrate 100. The color filter substrate 200 faces the TFT substrate 100 and is spaced apart from the TFT substrate 100. The color filter substrate 200 includes a second transparent substrate 210, a plurality of color filters 230, a black matrix pattern 220, and a common electrode layer 240.

The second transparent substrate 210 is transparent and is an insulator. The second transparent substrate 210 has a plate shape. The second transparent substrate 210 may be, for example, a glass substrate, a plastic substrate, or a quartz substrate.

The color filters 230 are disposed under the second transparent substrate 210. The color filters 230 filter the white light L2 to convert the light L3 having color. The color filters 230 may be, for example, a red color filter (R), a green color filter (G), and a blue color filter (B). The color filters 230 are disposed in the pixel areas, respectively.

That is, the white light L2 passes through the color filters 230 and is converted into light L3 having a second color. That is, the red, green, and blue images may be implemented by the color filters 230.

The black matrix pattern 220 is disposed under the second transparent substrate 210. The black matrix pattern 220 blocks light. The black matrix pattern 220 may be disposed at a boundary of the pixel areas. In addition, the black matrix pattern 220 may be disposed to cover the thin film transistor.

The common electrode layer 240 is disposed under the second transparent substrate 210. The common electrode layer 240 is disposed under the color filters 230. The location of the common electrode layer 240 is not limited thereto, and may be interposed between the color filters 230 and the second transparent substrate 210.

The common electrode layer 240 is transparent and is a conductive layer. Examples of the material used as the common electrode layer 240 may include indium tin oxide or indium zinc oxide.

The liquid crystal layer 300 is interposed between the TFT substrate 100 and the color filter substrate 200. In more detail, the liquid crystal layer 300 is interposed between the common electrode layer 240 and the pixel electrodes. The liquid crystal layer 300 is aligned by an electric field formed between the common electrode layer 240 and the pixel electrodes. Accordingly, the optical characteristic of the liquid crystal layer 300 is changed by the electric fields.

The sealing member 400 may be disposed between the TFT substrate 100 and the color filter substrate 200. The sealing member 400 bonds the TFT substrate 100 and the color filter substrate 200.

A scattering pattern 500 is disposed below the first transparent substrate 110. The scattering pattern 500 scatters incident light. In addition, the scattering pattern 500 may be scattered by converting the incident light L1 of the first color into white light. That is, the scattering pattern 500 may include the light conversion material described above.

The scattering pattern 500 may be a dot pattern, and may be printed on the bottom surface of the first transparent substrate 110 by printing or imprinting.

In addition, a reflective sheet for reflecting the light L1 of the first color upward may be disposed below the liquid crystal panel 20.

The light emitting diode 10 injects the light L1 of the first color into the liquid crystal panel 20. In more detail, the light emitting diodes 10 are disposed on side surfaces of the first transparent substrate 110. The light emitting diode 10 emits light toward the side surface of the first transparent substrate 110.

That is, the light L1 of the first color emitted from the light emitting diode 10 is incident on the first transparent substrate 110 through the side surface of the first transparent substrate 110. Thereafter, the light L1 of the first color incident on the first transparent substrate 110 is emitted upward through scattering, refraction, total reflection, and the like, and passes through the light conversion layer 120. Accordingly, the light L1 of the first color is converted into white light L2.

Thereafter, the white light L2 passes through the optical layers included in the TFT layer 130, passes through the liquid crystal layer 300, and passes through the color filters 230. Accordingly, the display device according to the exemplary embodiment displays the light (or image) of the second color through the upper surface of the liquid crystal panel 20.

The liquid crystal display according to the exemplary embodiment does not convert the light L1 of the first color to the white light L2 immediately after being emitted from the light emitting diode 10, and through the first transparent substrate 110. After sufficient diffusion, the light conversion layer 120 is used to convert the light into white light L2.

Since the light L1 of the first color diffused by the first transparent substrate 110 is converted into white light L2, the light conversion layer 120 has a very thin thickness. That is, the light conversion layer 120 has a much thinner thickness than the case where it is coated on the exit surface of the light emitting diode 10.

Therefore, the liquid crystal display according to the embodiment may minimize the loss of light generated in the process of changing the light L1 of the first color to the white light L2.

Thus, the liquid crystal display according to the embodiment has improved luminance.

In addition, the liquid crystal display according to the embodiment may display a uniform image without using a light guide plate.

Therefore, the liquid crystal display according to the embodiment is slimmer and can be easily manufactured at low cost.

3 is a cross-sectional view illustrating a liquid crystal display device according to another embodiment. In the present embodiment, the light conversion layer, the light guide plate, and the scattering pattern will be further described with reference to the above-described embodiment. The description of the foregoing embodiment may be essentially combined with the description of the present embodiment, except for the changed part.

Referring to FIG. 3, the liquid crystal display includes a light guide plate 30.

The light guide plate 30 is disposed under the liquid crystal panel 20. The light guide plate 30 has a plate shape and is transparent. Examples of the material used as the light guide plate 30 include polymethyl methacrylate (PMMMA), polycarbonate (PC), and the like.

The light guide plate 30 receives the light L1 of the first color emitted from the light emitting diode 10. That is, the light emitting diodes 10 are disposed on the side surface of the light guide plate 30 to directly enter the light L1 of the first color into the light guide plate 30.

The light guide plate 30 emits the light L1 of the first color upward through reflection, refraction, and scattering. In particular, the light guide plate 30 uniformly emits the light L1 of the first color through the entire upper surface.

Below the light guide plate 30, a reflective sheet 40 may be further disposed to reflect upwardly the light emitted downward from the light guide plate 30.

The light conversion layer 121 is interposed between the liquid crystal panel 20 and the light guide plate 30. In more detail, the light conversion layer 121 may be disposed on an upper surface of the light guide plate 30. That is, the light conversion layer 121 may be coated on the upper surface of the light guide plate 30. Alternatively, the light conversion layer 120 may be disposed inside the liquid crystal panel 20 as in the above-described embodiment. Alternatively, the light conversion layer may be coated on the lower surface of the liquid crystal panel 20.

In addition, the scattering pattern 50 is not disposed on the bottom surface of the liquid crystal panel 20, but is disposed on the bottom surface of the light guide plate 30.

In the liquid crystal display according to the embodiment, the light L1 of the first color is emitted from the light emitting diode 10 and is not immediately converted into white light L2, but is sufficiently diffused through the light guide plate 30. Thereafter, the light conversion layer 121 is used to convert the light into white light L2.

Since the light L1 of the first color diffused by the light guide plate 30 is converted into white light L2, the light conversion layer 121 has a very thin thickness. That is, the light conversion layer 121 has a much thinner thickness than the case where it is coated on the exit surface of the light emitting diode 10.

Therefore, the liquid crystal display according to the embodiment may minimize the loss of light generated in the process of changing the light L1 of the first color to the white light L2.

Thus, the liquid crystal display according to the embodiment has improved luminance.

In addition, the features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

Although described above with reference to the embodiment is only an example and is not intended to limit the invention, those of ordinary skill in the art to which the present invention does not exemplify the above within the scope not departing from the essential characteristics of this embodiment It will be appreciated that many variations and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

1 is a perspective view illustrating a liquid crystal display according to an embodiment.

FIG. 2 is a cross-sectional view illustrating a cross section taken along line AA ′ in FIG. 1.

Claims (11)

A light source for emitting light of a first color; And And a display panel including a light conversion layer for converting the light of the first color into white light. The display device of claim 1, wherein the light source is a blue light emitting diode, and the light conversion layer comprises a yellow phosphor. The display panel of claim 1, wherein the display panel And color filters for converting the white light into light of a second color. The display panel of claim 1, wherein the display panel Transparent substrate; And A TFT layer disposed on the transparent substrate, the TFT layer including a plurality of wires and thin film transistors; And the light conversion layer is interposed between the transparent substrate and the TFT layer. The display panel of claim 1, wherein the display panel A first transparent substrate; A second transparent substrate disposed on the first transparent substrate; And A liquid crystal layer interposed between the first transparent substrate and the second transparent substrate, And the light source emits light of the first color toward the side surface of the first transparent substrate. The display device of claim 5, wherein the display panel includes a scattering pattern disposed on a bottom surface of the first transparent substrate. The display device of claim 6, wherein the scattering pattern converts light of the first color into white light. A light source for emitting light of a first color; A light guide plate receiving light of a first color emitted from the light source; A display panel on the light guide plate; And And a light conversion layer for converting the light of the first color into white light. The display device of claim 8, wherein the light conversion layer is disposed on a lower surface of the display panel, an upper surface of the light guide plate, or an inner side of the display panel. The display device of claim 8, further comprising a scattering pattern disposed on a bottom surface of the light guide plate. The display device of claim 10, wherein the scattering pattern comprises a phosphor.
KR1020090080520A 2009-08-28 2009-08-28 Display device KR20110022970A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130064650A (en) * 2011-12-08 2013-06-18 엘지이노텍 주식회사 Display device
KR20160091868A (en) * 2016-07-22 2016-08-03 엘지이노텍 주식회사 Display device
CN106353915A (en) * 2016-11-08 2017-01-25 深圳市华星光电技术有限公司 Ultrathin liquid crystal display
KR20170116638A (en) * 2016-04-11 2017-10-20 삼성디스플레이 주식회사 display device
US10551671B2 (en) 2015-07-20 2020-02-04 Samsung Display Co., Ltd. Display panel with light converting layer therein, display device including the same and method of manufacturing the same
US10564344B2 (en) 2015-05-06 2020-02-18 Samsung Display Co., Ltd. Display panel and method of manufacturing the same

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130064650A (en) * 2011-12-08 2013-06-18 엘지이노텍 주식회사 Display device
US9494723B2 (en) 2011-12-08 2016-11-15 Lg Innotek Co., Ltd. Display device
US9606284B2 (en) 2011-12-08 2017-03-28 Lg Innotek Co., Ltd. Display device
US10564344B2 (en) 2015-05-06 2020-02-18 Samsung Display Co., Ltd. Display panel and method of manufacturing the same
US10551671B2 (en) 2015-07-20 2020-02-04 Samsung Display Co., Ltd. Display panel with light converting layer therein, display device including the same and method of manufacturing the same
KR20170116638A (en) * 2016-04-11 2017-10-20 삼성디스플레이 주식회사 display device
KR20160091868A (en) * 2016-07-22 2016-08-03 엘지이노텍 주식회사 Display device
CN106353915A (en) * 2016-11-08 2017-01-25 深圳市华星光电技术有限公司 Ultrathin liquid crystal display

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