KR20160115734A - Display device - Google Patents

Display device Download PDF

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Publication number
KR20160115734A
KR20160115734A KR1020160032192A KR20160032192A KR20160115734A KR 20160115734 A KR20160115734 A KR 20160115734A KR 1020160032192 A KR1020160032192 A KR 1020160032192A KR 20160032192 A KR20160032192 A KR 20160032192A KR 20160115734 A KR20160115734 A KR 20160115734A
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South Korea
Prior art keywords
quantum dot
light emitting
liquid crystal
crystal panel
pixels
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KR1020160032192A
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Korean (ko)
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KR101729166B1 (en
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이혁재
차수진
김영주
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주식회사 나노스퀘어
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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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G02F2001/01791—

Abstract

The present invention relates to a display device which comprises: a liquid crystal panel in which a plurality of pixels are arranged in a matrix shape; and a rear light source installed to face the liquid crystal panel. The display device comprises: the liquid crystal panel including a liquid crystal sheet, a polarization film, and a color filter; and a quantum dot light emitting panel installed on a rear surface of the liquid crystal panel. The quantum dot light emitting panel comprises a plurality of quantum dot light emitting sources. The plurality of quantum dot light emitting sources separately receive independent electrical signals to control optical features.

Description

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device, and more particularly, to a display device having a unit light source independently controlled by a light source installed on a rear surface of a liquid crystal panel to improve a contrast ratio.

A display device is a device for displaying a specific shape, a symbol or the like by applying an electrical signal to a plurality of pixels. The display device is divided into a self-emission type and a non-emission type. The self-emission type display device includes a plasma display device, an organic light emitting diode (OLED) OLED). In the non-light emitting display device, a light source must be separately provided on the rear surface, and a liquid crystal display device is representative.

The liquid crystal display device generally includes a backlight unit that implements a white light source on the rear surface, and the liquid crystal panel includes a liquid crystal portion for controlling the transmission of light and a color filter for implementing color. BACKGROUND ART [0002] In recent years, a backlight unit using a light emitting diode has been widely used because a backlight unit of a liquid crystal display device has been widely used in cold cathode fluorescent lamps in the past, but has a large volume and wavelengths of white light are not uniformly distributed.

In recent years, a backlight unit using a quantum dot light emitter has been commercialized under the name of Quantum dot display. The quantum dot light emitter is advantageous in that it has higher light efficiency than conventional light emitters, has a uniform spectrum and is continuous, I have.

A prior art document on backlight units using quantum dots is disclosed in Korean Patent Laid-Open Publication No. 2015-0040608. In the backlight unit disclosed in the prior art, a blue light emitting diode applies a method of supplying white light generated by emitting a quantum dot sheet to a liquid crystal panel. However, the quantum dot backlight unit of this type can not only uniformly supply white light to the liquid crystal panel So that the improvement of the contrast ratio is limited.

In the direct-type LED backlight unit, the individual light emitting diodes can be independently controlled to improve the contrast ratio. However, since the packaged LEDs have limitations in volume reduction, the contrast ratio The improvement is limited.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a backlight unit which is continuously arranged and has the same effect as a surface light source, and can independently control the optical characteristics in the divided regions of the surface light source, And a display device capable of improving the contrast ratio in a high resolution liquid crystal display device by controlling according to optical characteristics to be implemented in a plurality of pixels of the liquid crystal panel matched thereto.

In order to achieve the above object, the present invention provides a display device including a liquid crystal panel in which a plurality of pixels are arranged in a matrix form, and a rear light source opposed to the liquid crystal panel, the display device comprising a liquid crystal sheet, And a quantum dot luminescent panel disposed on a rear surface of the liquid crystal panel, wherein the quantum dot luminescent panel includes a plurality of quantum dot light emitting sources, and the plurality of quantum dot light emitting sources receive an independent electrical signal, The display device being controlled by the display device.

According to an embodiment of the present invention, the quantum dot light emitting source is formed at a position matched with a plurality of neighboring pixels of the liquid crystal panel, and an electrical signal applied to the quantum dot light emitting source is optically Can be interlocked according to the characteristics.

According to another embodiment of the present invention, the brightness of the quantum dot light emitting source may be controlled to be proportional to the maximum brightness among the plurality of liquid crystal panels matched with the quantum dot light emitting source.

According to another embodiment of the present invention, the quantum dot light emitting layer included in the quantum dot light emitting source may be a mixture of quantum dot materials having different optical properties so that white light is realized.

According to another embodiment of the present invention, the quantum dot light emitting sources include unit light emitting sources that emit light of different wavelengths, and the unit light emitting sources receive an independent electrical signal, The applied electrical signal can be interlocked by the average value of the color coordinates to be implemented in the pixels of the matched liquid crystal panel.

According to another embodiment of the present invention, a light diffusion film is formed between the quantum dot light emitting source and the liquid crystal panel, and a light diffusion preventing pattern may be formed on the light diffusion film so that light diffusion does not occur between different quantum- .

The display device of the present invention has the following effects.

1. The backlight unit is composed of a quantum dot luminescent panel capable of independently controlling individual light emitting sources, and the quantum dot luminescent panel is formed by a patterning method using a printing or photolithography technique on a substrate, It is possible to control the optical characteristics of the light emitting sources with a higher resolution than the direct-type backlight unit of FIG.

2. Since the light emitting sources of the quantum dot luminescent panels are provided to match with the pixels of the plurality of liquid crystal panels, the contrast characteristics and color reproducibility of the display device can be improved by controlling the optical characteristics of the individual light emitting sources according to the optical characteristics of the matched liquid crystal panel pixels And the intensity of unnecessary light sources can be reduced to increase the overall luminous efficiency of the display device.

3. The quantum dot luminescent panel is composed of red, green, and blue unit light emitting sources, and the brightness of the unit light emitting sources is controlled according to the color characteristics of the pixels to be realized in the liquid crystal panel. The luminous efficiency of the display device can be further improved.

4. An independent light diffusion film is formed between the pixels of the liquid crystal panel matched with the quantum dot light emitting source so that the color of the quantum dot unit light emitting source can be realized as white and the arrangement direction of the quantum dot unit light emitting sources and the arrangement direction So that the non-uniformity of colors not covered by the diffusion film can be compensated.

1 shows a liquid crystal panel and a quantum dot luminescent panel constituting a display device of the present invention.
2 illustrates a quantum dot luminescent panel applied to a display device of the present invention.
3 shows the quantum dot light emitting source and the pixels of the liquid crystal panel matched with the quantum dot light emitting source.
FIG. 4 illustrates a quantum dot luminescent panel to which mixed quantum dot materials are applied to realize white light.
FIG. 5 shows a quantum dot luminescent panel and a diffusion layer made of unit light emission sources of red, green, and blue.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

A display device of the present invention is a display device including a liquid crystal panel in which a plurality of pixels are arranged in a matrix form and a rear light source opposed to the liquid crystal panel, the liquid crystal panel including a liquid crystal sheet, a polarizing film, And a quantum dot luminescent panel disposed on a rear surface of the liquid crystal panel, wherein the quantum dot luminescent panel includes a plurality of quantum dot light emitting sources, and the plurality of quantum dot light emitting sources are each provided with independent electrical signals to control optical characteristics .

Important characteristics in display devices are high image quality and low power consumption. The image quality is evaluated by synthesizing various characteristics such as brightness, contrast ratio, resolution, and color reproducibility. Although the liquid crystal panel has advantages over other display devices in terms of resolution and brightness, it is essentially a non-emissive type display device, so the luminous efficiency is low and the implementation of high contrast ratio is limited due to the light leakage phenomenon in the liquid crystal. And a color reproducibility is also low when a light emitting diode is used. The present invention proposes a display device which can improve the luminous efficiency and the color reproducibility while realizing a high contrast ratio by using a quantum dot luminescent panel.

1 shows a liquid crystal panel and a quantum dot luminescent panel constituting a display device of the present invention. Referring to FIG. 1, the display device of the present invention includes a liquid crystal panel 100 and a quantum dot luminescent panel 200 disposed at the rear. The liquid crystal panel 100 includes a first polarizing film 101, a color filter 102, a liquid crystal sheet 103 and a second polarizing film 104, In units of pixels. The quantum dot luminescent panel 200 functions to supply light to the liquid crystal panel. The quantum dot material is patterned and applied to constitute a quantum dot light emitting source, and the individual quantum dot light emitting sources receive an independent electrical signal to control the optical characteristics.

Although not shown in the drawings, a driving terminal, a driving circuit, a controller, and the like capable of driving the liquid crystal panel can be installed in the display device. Also, since the quantum dot luminescent panel can independently control individual quantum dot light emitting sources, , A drive circuit, a controller, and the like.

In the display device of the present invention, a plurality of pixels of a liquid crystal panel are matched for each light emitting source of each quantum dot luminescent panel, and the matched light emitting sources and pixels are interlocked with each other to control optical characteristics. The luminance finally displayed by the pixels of the display element (red, green, and blue) is primarily controlled by the arrangement state of the corresponding liquid crystal, and the luminances . In a conventional liquid crystal display device in which the light luminance of the backlight unit is not adjusted when the luminance to be implemented in a specific pixel of the display device is determined at a specific timing, if the light transmittance of the liquid crystal panel for this is set to A% As such, the luminance of a particular pixel can be implemented as determined. However, in the display device of the present invention, when the light source luminance of the quantum dot luminescent panel is adjusted to a% (assuming that the maximum luminance is 100%), the light transmittance of the liquid crystal panel should be adjusted to A × (100 / a)%. As described above, in the display device of the present invention, the light source luminance of the quantum dot luminescent panel and the light transmittance of the liquid crystal panel are controlled to be linked with each other, which is advantageous in two respects.

The first is the improvement of the contrast ratio. The darkroom contrast ratio of the display device is a value obtained by dividing the maximum luminance realized by the pixels of the display device by the minimum luminance. At this time, since the minimum brightness is determined by the light leakage phenomenon of the liquid crystal panel, the improvement of the contrast ratio is limited. Since the minimum light transmittance due to the light leakage of the liquid crystal panel is a fixed value, the lower the brightness of the backlight light, the lower the minimum brightness of the pixels of the display device. In the display device of the present invention, the minimum luminance of the pixel for calculating the contrast ratio is derived in a state in which the light source luminance of the quantum dot luminescent panel is minimized and the light transmittance of the liquid crystal panel is minimized. As a result, have.

The second is the improvement of the luminous efficiency. In the non-light emitting type liquid crystal display device, the luminous efficiency is limited by the inability of the backlight to transmit the liquid crystal panel. The display device of the present invention adopts a method of adjusting the light of the backlight and increasing the light transmittance of the liquid crystal panel in accordance therewith, so that the luminous efficiency can be improved as a result.

2 (a) shows a quantum dot luminescent panel applied to the display device of the present invention. Referring to FIG. 2 (a), a plurality of quantum dot light emitting sources 201a, 201b, 201c and 201d are formed in the quantum dot luminescent panel 200. The quantum dot light emitting sources 201a, 201b, 201c and 201d can be controlled independently of each other in optical characteristics, and between the quantum dot light emitting sources, the light emitting source boundary 202 can be formed if necessary. The light emitting source boundary 202 may be a space required for electrically isolating individual quantum dot light emitting sources, and may be a means for separating and implementing optical characteristics of adjacent quantum dot light emitting sources such as a black matrix, as the case may be.

Although not shown in the figure, the quantum dot luminescent panel is provided with a drive circuit and a drive controller for independently driving individual quantum dot light emission sources. The quantum dot luminescent panel may be driven in an active mode or a passive mode, and the driving of the quantum dot luminescent panel is interlocked with the driving of the liquid crystal panel. The interlocked driving method realizes optical characteristics close to numerical values such as brightness and color coordinates determined according to optical characteristics to be implemented in a plurality of unit pixels of a liquid crystal panel matched to a specific quantum dot light emitting source in a quantum dot light emitting source. At this time, the luminance of the quantum dot light emitting source may be adjusted according to the average value of the luminance to be realized in the matched unit pixels of the liquid crystal panel or may be adjusted according to the maximum value of the luminance to be realized in the matched unit pixels of the liquid crystal panel . For example, assuming that the average luminance to be implemented in the matched liquid crystal panel unit pixels is X% of the maximum luminance, the luminance of the quantum dot light emitting source is X to 100% of the maximum luminance of the quantum dot light emitting source Lt; / RTI > In the latter case, assuming that the luminance to be implemented in the unit pixels having the maximum luminance among the matched liquid crystal panel unit pixels is Y%, the luminance of the quantum dot light emitting source is in the range of Y to 100% of the maximum luminance of the quantum dot light emitting source Lt; / RTI > It is preferable that the luminance of the quantum dot light emitting source is adjusted in the range of (Y + 10) to (Y + 50)% (the upper limit value does not exceed 100%). (Y + 10)%, there is a possibility that the luminance difference between the adjacent quantum dot light-emitting sources is too large to cause image quality distortion. If (Y + 50)% is exceeded, the improvement of the contrast ratio and the improvement of the luminous efficiency may be excessively limited . In order to maintain the color reproducibility, the maximum luminance of the unit pixels of the liquid crystal panel should be calculated as a percentage based on the red, green, and blue pixels.

2 (B) shows an example of a cross-sectional structure of a quantum dot luminescent panel applied to a display device of the present invention. The quantum dot luminescent panel has a sectional structure in which a cathode 203, an electron transport layer 204, a quantum dot luminescent layer 205, a hole transport layer 206 and an anode 207 are sequentially laminated. When a current flows in the quantum dot light emitting layer through the transparent electrode, light is generated in the quantum dot light emitting layer. In order to adjust the light emission luminance, the intensity of the voltage or current may be adjusted or the number of applied waveforms may be adjusted. The positive and negative electrodes may be separated from the respective quantum dot light emitting sources and receive independent signals. In this manner, the individual quantum dot light emitting sources may be controlled to have independent optical characteristics. Quantum dots are semiconductor nanoparticles, nanomaterials that have not only light emission (PL) but also electroluminescence (EL) and solar cell effects. Quantum dots are particles of the same composition. The larger the diameter of the quantum dots, the shorter the emission wavelength and the shorter the wavelength. Therefore, unlike general organic phosphors, white light can be obtained by mixing and applying quantum dot materials having red, green, and blue wavelength ranges at a certain ratio, and narrow full width half maximum (FWHM) color garmut. The quantum dot light-emitting diode is a diode that uses a quantum dot instead of an organic fluorescent material as a material of a light-emitting layer. Organic light emitting diodes (OLEDs) using organic light emitting materials realize various colors such as white, red, green and blue, but they have limitations due to problems such as chemical composition. On the other hand, the quantum dot light emitting device can compensate the disadvantage of a light emitting diode (LED) that is attracting attention as a next generation light source because it can realize a desired natural color by controlling the size of a quantum dot, and has good color reproduction rate and high luminance.

3 shows the quantum dot light emitting source and the pixels of the liquid crystal panel matched with the quantum dot light emitting source. 3, four liquid crystal panel unit pixels 105 are matched to one quantum dot light emitting source 201. For the implementation of colors, the unit pixels are divided into red, green, and blue unit colors Pixels 105a, 105b, and 105c. In the quantum dot light emitting source, the optical characteristics are controlled according to the average value or the maximum value of the optical characteristics of the twelve unit color pixels 105a, 105b, and 105c. Referring to FIG. 3 (b), nine quantum dot light emitting sources 201 are matched with nine liquid crystal panel unit pixels 105, and unit pixels are divided into red, green, and blue . In the quantum dot light emitting source, the optical characteristics are controlled according to the average value or the maximum value of the optical characteristics of the 27 unit color pixels 105a, 105b, and 105c. Although the figure shows only a case where a quantum dot light emitting source and four unit pixels or nine unit pixels are matched, a unit pixel matched with a quantum dot light emitting source can be variously selected from the range of 2 to 50. Considering image quality, it is preferable that unit pixels to be matched are selected in a matrix form having the same number of rows and columns. However, if the number of matched unit pixels is increased, the manufacturing cost of the quantum dot luminescent panel and the cost of the driving circuit are reduced, but the quality of the image can be deteriorated. Generally, the number of pixels in a full HD TV is about 2 million, the number of pixels in a 4k UHD TV is about 8 million, and the number of pixels in an 8k UHD is about 32 million. And the fixed burden on the fixed three-patterning can be reduced.

FIG. 4 illustrates a quantum dot luminescent panel to which mixed quantum dot materials are applied to realize white light. 4, a plurality of quantum dot light emitting sources 210 are arranged in a matrix form in a quantum dot light emitting panel, and a light emitting source boundary 202 is formed between adjacent quantum dot light emitting sources 210. The quantum dot light emitting source 210 is made of a quantum dot material for realizing white light. The quantum dot materials for generating light of different wavelength ranges are mixed to realize white light. Due to the characteristics of the quantum dot, the quantum dot materials have the same composition and chemical structure And may be a mixed form of materials of different sizes. In the case where the quantum dot light emitting source generates white light in this way, it is not necessary to use a separate diffusion film, and the light emitting source boundary can only have a meaning of a space necessary for electrical insulation of adjacent quantum dot light emitting sources.

The display device of the present invention is characterized in that the optical characteristics of the plurality of quantum dot light emitting sources are independently controlled and the optical characteristics of the quantum dot light emitting sources are controlled by interlocking with the optical characteristics to be realized in the unit pixels of the matched liquid crystal panel . The optical characteristics considered here are luminance, color coordinates, and the like. In the foregoing, the description has been made in terms of luminance, which will be described below in terms of color coordinates. In order to control the optical characteristics of the quantum dot light emitting source from the viewpoint of color coordinates, it is necessary to control the color of the quantum dot light emitting source itself. For this purpose, the quantum dot light emitting sources are unit light emitting sources of red, green, and blue, and each unit light emitting source may receive independent electrical signals to control the brightness. At this time, since a plurality of liquid crystal panel unit pixels are matched to one quantum dot light emitting source, the quantum dot light emitting source must emit white light in the entire area. Therefore, in this case, a light diffusion film having a light diffusion function should be formed between the quantum dot light emitting source and the liquid crystal panel. In addition, light should not be diffused between adjacent light diffusion films, so a light diffusion prevention pattern must be formed between the light diffusion films. Driving in the case where the quantum dot light emitting sources are unit light emitting sources of different colors is as follows. In the embodiment of the present invention as described above, the optical characteristic interlocking control between the quantum dot light emitting source and the liquid crystal panel unit pixel described above must be interlocked independently for each of red, green and blue. That is, the optical characteristics between the red light-emitting unit of the quantum dot unit and the red light unit of the liquid-crystal panel unit should be controlled in an interlocking manner, and the same applies to the green and blue light. Since the optical characteristics are controlled for each of red, green, and blue in the structure and the driving method, a higher contrast ratio improvement effect and a light efficiency improvement effect can be realized as compared with the quantum dot light source of white light described in FIG.

FIG. 5 shows a quantum dot luminescent panel and a diffusion layer made of unit light emission sources of red, green, and blue. 5A, the quantum dot luminescent panel includes a plurality of quantum dot light emitting sources 201, and the light emitting source 201 includes a red unit light emitting source 201R, a green unit light emitting source 201G, And a light emitting source 201B. At this time, the color filters of the liquid crystal panel and the quantum dot unit light emitting sources may be magenta, cyan, and yellow colors other than red, green, and blue. Each of the red unit light emitting source 201R, the green unit light emitting source 201G and the blue unit light emitting source 201B is connected to a drive circuit and a controller which can be independently driven. 5B, a light diffusion film 210 is formed between the liquid crystal panel and a quantum dot light emitting source made up of a red unit light emitting source 201R, a green unit light emitting source 201G, and a blue unit light emitting source 201B . A light diffusion preventing pattern must be formed between the light diffusion films 210 in order to prevent light diffusion with adjacent light diffusion films. For this purpose, the light diffusion film may be patterned using printing, photolithography, or the like, and if necessary, a light transmission preventing pattern such as a black matrix may be formed between the light diffusion patterns. When the red unit light emitting source 201R, the green unit light emitting source 201G, and the blue unit light emitting source 201B are mixed by the light diffusion film, white light can be realized. Depending on the luminance ratio of each unit light emitting source, Light having a predominant color coordinate can be supplied to the liquid crystal panel, but this is a result of considering the luminance of each color to be implemented in the unit pixel of the liquid crystal panel, so that there is no problem in color implementation in the liquid crystal panel. In addition, it is advantageous that the arrangement direction of the quantum dot unit light emitting sources and the arrangement direction of the unit pixels of the liquid crystal panel are perpendicular to each other. This is because the light characteristics in the liquid crystal panel that can occur when the light mixing in the light diffusion film is not completely performed To minimize implementation variances.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, . Therefore, the embodiments described in the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: liquid crystal panel 101: first polarizing film
102: color filter 103: liquid crystal sheet
104: second polarizing film 105: liquid crystal panel unit pixel
200: Quantum dot luminescent panel 201: Quantum dot luminescent source
202: emission source boundary 203: cathode
204: electron transport layer 205: quantum dot light emitting layer
206: hole transport layer 207: anode
210: light diffusion film

Claims (6)

1. A display device comprising a liquid crystal panel in which a plurality of pixels are arranged in a matrix form, and a rear light source opposed to the liquid crystal panel,
A liquid crystal panel including a liquid crystal sheet, a polarizing film and a color filter; And
And a quantum dot luminescent panel disposed on a rear surface of the liquid crystal panel,
Wherein the quantum dot luminescent panel includes a plurality of quantum dot light emitting sources, and the plurality of quantum dot light emitting sources receive an independent electrical signal to control optical characteristics. The method according to claim 1,
Wherein the quantum dot light emitting source is formed at a position matched with a plurality of neighboring pixels of the liquid crystal panel and the electrical signal applied to the quantum dot light emitting source is interlocked with the optical characteristics of the pixels of the liquid crystal panel at the matched position Display device. The method of claim 2,
Wherein the brightness of the quantum dot light emitting source is controlled to be proportional to a maximum brightness among a plurality of pixels of the liquid crystal panel matched with the quantum dot light emitting source. The method of claim 3,
Wherein the quantum dot luminescent layer included in the quantum dot light emitting source is a mixture of quantum dot materials having different optical characteristics so that white light is realized. The method of claim 3,
The quantum dot light emitting sources include unit light emitting sources that emit light of different wavelengths, and the unit light emitting sources receive an independent electrical signal, and the electrical signals applied to the unit light emitting sources are coupled to the matched liquid crystal panel Wherein the display unit is interlocked with an average value of color coordinates to be implemented in the pixels. The method of claim 5,
Wherein a light diffusion film is formed between the quantum dot light emitting source and the liquid crystal panel, and a light diffusion preventing pattern is formed on the light diffusion film so that light diffusion does not occur between different quantum dot light emission sources.
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Publication number Priority date Publication date Assignee Title
CN108459435A (en) * 2018-01-19 2018-08-28 精电(河源)显示技术有限公司 A kind of liquid crystal display using quantum dot light emitting

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KR20110080514A (en) * 2010-01-06 2011-07-13 엘지이노텍 주식회사 Backlight unit and display apparatus using thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108459435A (en) * 2018-01-19 2018-08-28 精电(河源)显示技术有限公司 A kind of liquid crystal display using quantum dot light emitting

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