KR102315369B1 - Apparatus and method for estimating color coordinates of a quantum dot display - Google Patents

Abstract

The present invention relates to an apparatus for measuring color coordinates of a quantum dot display and a method therefor. In the method of measuring color coordinates in a quantum dot display according to an embodiment of the present invention, the steps of emitting a blue light source through a quantum dot filter, the red color filter from the light source emitted by the quantum dot filter detecting a red light source passing through a photo resist (PR) and a green light source passing through a green PR of the color filter, detecting a blue light source passing through the blue PR of the color filter, and the sensed red light source; The method may include measuring color coordinates based on at least a part of the green light source and the blue light source.

Description

Apparatus and method for measuring color coordinates of a quantum dot display

The present invention relates to an apparatus and method for measuring color coordinates of a quantum dot display.

Quantum dots (QDs) refer to ultrafine semiconductor nanoparticles having a diameter of several nanometers (nm) or less. And, the quantum dot is composed of a core and a shell, and has a structure in which the outside is covered with a polymer coating. These quantum dots can emit light in various colors by generating a light source having a wavelength of a different length for each particle size without changing the type of material. Although quantum dots are the same material, when light is irradiated or an electric current is supplied, the emitted color varies depending on the size of the particles. For example, when the particle size of a quantum dot is small, a blue light source of a short wavelength is emitted, and a red light source of a long wavelength is emitted as the size of the particle is large.

A quantum dot display is a display in which characteristics of a display are improved by using a light emitting material or a fluorescent material based on the characteristics of the quantum dot, and includes an organic light-emitting diode (QD-OLED) display. The QD-OLED display uses a blue light source as a backlight, and the blue light source emits color through a green light source and a red light source made of quantum dots. And, in the prior art, in order to measure the color coordinates of the quantum dot display, a white light source was measured through the quantum dot display.

1A is a block diagram of a conventional quantum dot display. 1B is an exemplary diagram illustrating a transmittance spectrum in a red pixel in a conventional quantum dot display. 1C is an exemplary diagram illustrating a red light source having high luminance when a light source having a short wavelength is used in a conventional quantum dot displacer.

1A to 1C, when a white light source is generated in the quantum dot display 110 to calculate color coordinates in the related art, the quantum dot display 110 is physically separated from the quantum dot display 110 in the light source detector 120 ( 110) was detected.

The quantum dot display 110 includes a light source generator 111 that generates a white light source to measure color coordinates, a quantum dot (QD) light emitting layer 112 that emits light from the generated white light source as a red light source and a green light source, and the quantum dot light emitting layer. The color filter 113 disposed on the upper end of the 112 may include a glass substrate 114 disposed on the upper end of the color filter 113 . In addition, the light source detection unit 120 receives the red light source, the green light source, and the blue light source passing through the glass substrate, and detects color coordinates.

_{For example, since the intensity I 0} of the light source incident on the glass substrate 114 passes through the glass substrate and a light source having a short wavelength (eg, blue light source) is absorbed by the glass substrate, the intensity I ₁ A wavelength with

Due to the characteristics of the glass substrate, the intensity (I ₁ ) of the light source passing through the glass substrate is significantly less than the intensity of the light source irradiated to the glass substrate (I ₀ ), so the transmittance (I ₁ / I _{0 ) of the glass substrate} ) converges to a value of 0, and eventually the wavelength required for color coordinate calculation cannot be obtained. _{In addition, the intensity I 1} of the light source incident on the quantum dot light emitting layer 112 is output through the color filter 113 with an intensity of _{I 2} while the blue light source emits light as a red light source and a green light source in the quantum dot light emitting layer 114 . The quantum dot emission layer 112 emits a blue light source as a red light source and a green light source, so that the transmittance (I ₂ / I ₁ ) of the quantum dot emission layer 112 has an infinite value.

After all, in the conventional method of transmitting a white light source to the quantum dot display in the quantum dot display 110 , since the glass substrate 114 included in the quantum dot display 110 absorbs light in the visible region, the wavelength required for color coordinate detection could not get In addition, when the conventional quantum dot display 110 detects color coordinates using reflected light, there is a problem in that it is difficult to detect a light source required for calculating color coordinates because of the property of being absorbed or scattered without being reflected. In addition, as a light source of a short wavelength is used, the expiration date of the quantum dot light emitting layer is reduced, and when a light source of a long wavelength is used, there is a problem that the red and green of the quantum dot light emitting layer are not excited. In addition, in the prior art, in order to detect color coordinates, the transmittance (I ₁ / I ₀ ) of the glass substrate 112 and the transmittance (I ₂ / I ₁ ) of the quantum dot light emitting layer had to be calculated.

In order to solve this conventional problem, data was obtained by irradiating a light source with a short wavelength to emit light in the quantum dot emission layer. As shown in FIG. 1C , the luminance 140 of the green light source and the red light source increases as the light of a shorter wavelength is emitted by irradiating the light source with a shorter wavelength. However, this method also has a problem in that the lifetime of the quantum dot light emitting layer is shortened as a light source having a shorter wavelength is used.

Therefore, by irradiating a specific light to the quantum dot light emitting layer of the quantum dot display and emitting light using a white light source and a band pass filter to detect color coordinates, there is a need to improve the lifetime of the quantum dot light emitting layer and reduce the amount of calculation for calculating color coordinates.

An object of the present invention is to provide an apparatus and method for measuring the color coordinates of a quantum dot display by irradiating a blue light source with a small wavelength to the quantum dot emission layer to emit light.

Another object of the present invention is to provide an apparatus and method for measuring color coordinates of a quantum dot display for measuring color coordinates using a light source irradiated from a light source generator located outside the quantum dot display.

Another object of the present invention is to provide an apparatus and method for measuring the color coordinates of a quantum dot display that measures the color coordinates by passing a light source of a specific wavelength from a white light source through a band pass filter.

Another object of the present invention is to provide an apparatus and method for measuring color coordinates of a quantum dot display that more accurately measure color coordinates by adjusting the half-width of a specific wavelength passed through the control of the bandpass filter.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the examples of the present invention. Moreover, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

An apparatus and method for measuring color coordinates of a quantum dot display according to the present invention for solving the above-described problems may receive a light source from a light source generator physically spaced apart from the quantum dot display.

In addition, the present invention irradiates a light source corresponding to a specific wavelength to a quantum dot display in a light source generator including a bandpass filter that passes a specific wavelength, and the quantum dot display can measure color coordinates through a light source corresponding to a specific wavelength. .

In addition, the apparatus and method for measuring the color coordinates of a quantum dot display according to the present invention can measure the color coordinates of a quantum dot display by irradiating a blue light source with a small wavelength to the quantum dot light emitting layer to emit light.

In addition, the apparatus and method for measuring the color coordinates of a quantum dot display according to the present invention adjust the pass band of the specific band by adjusting the size of the wavelength filtered by the band pass filter of the light source generator to more accurately measure the color coordinate table can do.

To this end, the present invention provides a method for measuring color coordinates in a quantum dot display, in which a blue light source that transmits a red PR and a green PR of a color filter emits light through a quantum dot light emitting layer. step, detecting a red light source and a green light source from a white light source emitted by the quantum dot light emitting layer, detecting a blue light source passing through the blue PR of the color filter, and the detected red light source, the green light source and the The method may include measuring color coordinates based on at least some of the blue light sources.

In addition, the present invention relates to an apparatus for measuring color coordinates in a quantum dot display, a color filter, a quantum dot light emitting layer for emitting a blue light source that transmits red PR and green PR of the color filter, and color coordinates a measurement unit, wherein the color coordinate measurement unit measures color coordinates based on at least a portion of a red light source and a green light source sensed based on a white light source emitted by the quantum dot light emitting layer, and a blue light source that transmits a blue PR of the color filter can be set to

By measuring the color coordinates of the quantum dot display according to the present invention, process management may be possible.

In addition, the apparatus and method for measuring the color coordinates of a quantum dot display according to the present invention measure the color coordinates of a red light source, a green light source, and a blue light source by combining a white light source and a filter that passes the blue light source from the white light source. Process control can be monitored in real time.

In addition, the apparatus and method for measuring the color coordinates of a quantum dot display according to the present invention irradiate a specific light to the quantum dot light emitting layer of the quantum dot display to emit a blue light source and a green light source to detect color coordinates, thereby improving the lifetime of the quantum dot light emitting layer and calculating the color coordinates It can reduce the amount of computation to be performed.

In addition to the above-described effects, the specific effects of the present invention will be described together while describing specific details for carrying out the invention below.

1A is a block diagram of a conventional quantum dot display.
1B is an exemplary diagram illustrating a transmittance spectrum in a red pixel in a conventional quantum dot display.
1C is an exemplary diagram illustrating a red light source having high luminance when a light source having a short wavelength is used in a conventional quantum dot displacer.
2A is a block diagram of an apparatus for measuring color coordinates of a quantum dot display according to an embodiment of the present invention.
2B is a block diagram of an apparatus for measuring color coordinates of a quantum dot display according to another embodiment of the present invention.
3 is an exemplary diagram of an apparatus for measuring color coordinates of a quantum dot display according to an embodiment of the present invention.
4 is a flowchart illustrating a process of measuring color coordinates in a quantum dot display according to an embodiment of the present invention.
5 is a flowchart illustrating a process of removing interference from color coordinates measured in a quantum dot display according to an embodiment of the present invention.
6 is a flowchart illustrating a process of measuring color coordinates and removing interference generated in the measured color coordinates in a quantum dot display according to an embodiment of the present invention.
7A is an exemplary diagram of reducing the half width of the blue light source so that the blue light source does not interfere with the green light source according to an embodiment of the present invention.
7B is an exemplary view illustrating a result of reducing the half maximum width of the blue light source so that the blue light source does not interfere with the green light source according to an embodiment of the present invention.
8 is an exemplary view illustrating a relationship between a change in half width and a change in green color coordinates according to an embodiment of the present invention.
9 is an exemplary diagram illustrating color coordinates according to an embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from other components, and unless otherwise stated, the first component may be the second component, of course.

In the following, that an arbitrary component is disposed on the "upper (or lower)" of a component or "upper (or below)" of a component means that any component is disposed in contact with the upper surface (or lower surface) of the component. Furthermore, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Also, when it is described that a component is "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that “or, each component may be “connected,” “coupled,” or “connected” through another component.

Throughout the specification, unless otherwise stated, each element may be singular or plural.

As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "consisting of" or "comprising" should not be construed as necessarily including all of the various components or various steps described in the specification, some of which components or some steps are It should be construed that it may not include, or may further include additional components or steps.

Throughout the specification, when “A and/or B” is used, it means A, B or A and B, unless specifically stated to the contrary, and when “C to D” is used, it means that there is no specific contrary description. Unless otherwise specified, it means that it is greater than or equal to C and less than or equal to D.

Hereinafter, induction heating and wireless power transmission apparatus according to some embodiments of the present invention will be described.

2A is a block diagram of an apparatus for measuring color coordinates of a quantum dot display according to an embodiment of the present invention. 2B is a block diagram of an apparatus for measuring color coordinates of a quantum dot display according to another embodiment of the present invention.

2A and 2B , the apparatus for measuring color coordinates in the quantum dot display 210 according to an embodiment of the present invention may receive a white light source output from the blue light source generator 220 .

The quantum dot display 210 includes a blue light source generating unit 211 for generating a blue light source, a QD light emitting layer 212 for receiving the blue light source generated from the blue light source generating unit 211 , and an upper end of the QD light emitting layer 212 . It may include a color filter 213 disposed on the , and a glass substrate 214 disposed on an upper end of the color filter. The QD emission layer 212 may include a red quantum dot (QD) emission 212a and a green QD emission 212b. In addition, the color filter 213 includes at least one red photo resist (PR) 213a passing through the red light source, at least one green PR 213b passing the green light source, and at least one blue light transmitting the blue light source. It may include a PR 213c. Then, each of the red light sources passing through the glass substrate 214, the light source detecting unit 220 for detecting the green light source and blue light source, and measuring the color coordinates based on at least a part of the light sources detected by the light source detecting unit 220 A color coordinate measuring unit 230 may be included. The light source detecting unit 220 and the color coordinate measuring unit 230 may be disposed in a part of the quantum dot display 210 by design or may be physically separated from each other. The light source detecting unit 220 and the color coordinate measuring unit 230 may be integrated into a part of the quantum dot display 210 as one module to detect the light source, or the quantum dot display 210 as a separate component. It can be placed outside of

The blue light source generator 211 may emit a blue light source (eg, light). The blue light source generating unit 211 may emit light through a blue LED. As shown in FIG. 2B , the blue light source generator 211 includes a light source generator 211a that generates a white light source, and at least one bandpass filter 211b that transmits a specific wavelength of the white light source. ) may be included. The white light source may be filtered through a band pass filter (BPF) 211b and irradiated onto the display 210 as a blue light source.

The blue light source generator 211 may irradiate the blue light source with red quantum dot (QD) light emission 212a and green QD light emission 212b. Also, the blue light source generator 211 may irradiate the blue light source with the blue PR 213c of the color filter 213 .

The QD emission layer 212 may emit a blue light source as a white light source. According to an embodiment, the QD emission layer 212 may emit a blue light source as a red light source and a green light source. The QD emission layer 212 may include a red QD emission 212a emitting a red light source and a green QD emission emission emitting a green light source. As shown in FIG. 2A , the light source emitted from the red QD emission 212a of the QD emission layer 212 passes through the red PR 213a of the color filter 213 and is emitted from the green QD emission 212b. The light source may pass through the green PR 213b of the color filter 213 . In addition, the blue light source irradiated from the blue light source generator 211 may pass through the blue PR 213c of the color filter 213 . The light source passing through the red PR 213a , the green PR 213b , and the blue PR 213c may be detected by the light source detector 220 through the glass substrate 214 .

The color filter 213 includes at least one red PR 213a emitting a red light source, at least one green PR 213b emitting a green light source, and at least one blue PR 213c emitting a blue light source. can do. The color filter 213 reflects light of a predetermined wavelength range to each PR (photo resist) (or cell) from the red light source and the green light source emitted from the QD filter 212, and is outside the predetermined wavelength range. It can function to realize color by absorbing light in a different wavelength range. Alternatively, the color filter 213 may emit a white light source through the QD emission layer 212 . The white light source may include a blue light source having a first wavelength range, a green light source having a second wavelength range, and a red light source having a third wavelength range. The first wavelength range is smaller than the second wavelength range, and the second wavelength range is smaller than the third wavelength range. As the color filter 213 , color filters having different absorption and transmission wavelength ranges may be used together, and RGB colors may be realized by this function of the color filter 213 . As shown in FIG. 2A , the blue light source that transmits at least one blue PR 213c of the color filter 213 does not go through the QD light emitting layer 212 but through the glass substrate 214 through the light source detection unit 220 . can be transmitted to Alternatively, as shown in FIG. 2B , the blue light source passing through at least one blue PR 213c of the color filter 213 is focused through a lens (not shown) of the light collecting unit 221 , and then the light source detecting unit may be passed to 220 . The lens (not shown) may be disposed inside or outside the light source detection unit 220 .

The quantum dots QD of the QD emission layer 212 may be formed of cadmium-selenium (CdSe), and as the size of the quantum dots QD increases from 1.2 nm to 12 nm, blue to green, yellow, and red change to color The reason for having such a characteristic is that the smaller the size of the quantum dot (QD), the higher the ratio of surface atoms is, and from a thermodynamic point of view, the atoms constituting the surface have higher energy than the atoms located inside. In addition, regardless of the surface atoms, it has the above characteristics even by the systematic change of the electron energy level density, which is expressed as a function of the size of a simple internal crystal. Such quantum dots (QD) are formed of cadmium-selenium (CdSe), which may be formed in a core-shell structure having a core and a shell. In addition, there are various types of the quantum dots (QD) depending on the constituent atoms. In addition, quantum dots (QDs) are a single material or core/shell composed of Groups II-VI (CdSe, CdS, CdTe, ZnSe, ZnS, etc.) and Group III-V (InP, GaAs, GaP, GaN, etc.) ) can have a structure.

The glass substrate 214 may be made of a material (eg, glass) through which a white light source can be transmitted. The transmittance of the white light source passing through the glass substrate 213 may be low due to the characteristics of the glass.

The light source detector 220 may detect a light source emitted through the glass substrate 214 . According to an embodiment, the light source detection unit 212 may detect at least a portion of the red light source and the green light source emitted through the glass substrate 214 . According to an embodiment, the light source detection unit 212 may detect at least a portion of the light source that has passed through the blue PR 213c. According to an embodiment, the light source detection unit 212 may include a lens (not shown) for condensing the light source emitted through the QD emission layer 212 . The lens (not shown) may be included in the light source detection unit 212 or may be configured separately from the light source detection unit 212 . The operation performed by the light source detection unit 212 may be performed by the color coordinate measurement unit 211 by design.

The light condensing unit 221 may include a lens (not shown) for condensing the light source, and may condense the light source from the QD emission layer 212 and the color filter 213 through the lens. A green light source from the quantum dot (QD) light emitting layer 212 is focused on a lens (not shown) of the light collecting unit 221 through a green PR 213b, and a red light source is focused on the light collecting unit through a red PR 213a. Condensed by the lens (not shown) of 221 . Then, the light source from the blue PR 216c of the color filter 213 is condensed by the lens (not shown) of the condensing unit 221 . The light collecting unit 221 transmits the light source focused through the lens to the light source detecting unit 220 .

The color coordinate measuring unit 230 may measure color coordinates based on at least a part of the light source detected by the light source detecting unit 220 . According to an embodiment, the color coordinate measuring unit 230 may measure a color coordinate based on at least a part of a red light source and a green light source emitted by the QD light emitting layer 212 . Also, the color coordinate measuring unit 230 may measure the color coordinates based on at least a part of the blue light source that passes through the partial PR of the color filter 213 (eg, the blue PR 213c).

According to an embodiment, the color coordinate measuring unit 230 identifies whether the interference between colors exceeds an allowable limit based on the measured deviation of the color coordinates, and based on the interference between the colors exceeding the allowable limit, , a full width at half maximum (FWHM) of the blue light source may be reduced by a predetermined size, and the color coordinates may be measured based on the reduced full width at half maximum (FWHM) by the predetermined size. The full width at half maximum means a width between wavelengths as large as the predetermined wavelength from a wavelength as small as a predetermined wavelength based on a wavelength corresponding to a maximum peak value. The full width at half maximum means a width between wavelengths as large as the predetermined wavelength from a wavelength as small as a predetermined wavelength based on a wavelength corresponding to a maximum peak value. For example, when the half maximum width of the blue light source, the green light source, and the red light source is reduced, interference between the respective light sources can be reduced. The color coordinate measurement unit 230 may identify color coordinates that are misaligned due to interference caused by different wavelengths of the blue light source, the green light source, and the red light source. According to an embodiment, the color coordinate measuring unit 230 may detect a shift in color coordinates based on interference between the wavelength of the blue light source and the wavelength of the green light source. The color coordinate measuring unit 230 may identify whether the interference between colors exceeds an allowable limit. The color coordinate measuring unit 230 may identify whether the deviation of the color coordinates exceeds a predetermined threshold value. For example, if it is detected that the deviation of the color coordinates exceeds the allowable limit, the color coordinate measuring unit 230 may reduce the full width at half maximum with respect to the wavelength of the blue light source by a predetermined size. The color coordinate measuring unit 230 reduces the full width at half maximum with respect to the wavelength of the blue light source by a predetermined size until the deviation of the color coordinate does not exceed the allowable limit, and based on the reduced full width at half maximum, the wavelength of the blue light source and the green A shift in color coordinates may be detected based on the interference between the wavelengths of the light sources.

The color coordinate measuring unit 230 may measure (or calculate) the respective color coordinates of the red light source, the green light source, and the blue light source. A tristimulus value of a light source having a standard light spectral distribution function (S(λ)) used for color display is expressed by Equation 1 below.

<Equation 1>

,

,

는 x, y, z 색좌표계에서 등색함수를 나타내고,

는 발광하는 빛의 분광 방사율을 나타낸다. 그리고, 상기 <수학식 1>은 삼자극치, 광분포도, 방사율을 적분한 값이다.In <Equation 1>, K is a scaling coefficient representing the maximum relative spectral luminous efficacy, X is the X tristimulus value, Y is the Y tristimulus value, and Z is the Z tristimulus value.

,

,

represents the isochromatic function in the x, y, z color coordinate system,

represents the spectral emissivity of the emitted light. And, the <Equation 1> is a value obtained by integrating the tristimulus value, the light distribution, and the emissivity.

When the color coordinate measuring unit 230 multiplies both the spectral distribution and the emissivity isochromatic function, sums them up in the visible light wavelength range, and applies the k value, the X tristimulus value, the Y tristimulus value, and the Z tristimulus value can be obtained. For example, the color coordinate measuring unit 230 adds the spectral stereoscopic transmittance to a value obtained by multiplying the standard light spectral distribution function (S(λ) and the isochromatic function of each color coordinate system by the visible light wavelength range, so that the X tristimulus value, Y tristimulus value) Extremes and Z tristimulus values can be calculated.

In addition, the color coordinate measuring unit 230 may obtain the color coordinates of the X tristimulus value, the Y tristimulus value, and the Z tristimulus value through Equation 2 below.

<Equation 2>

The x coordinate is obtained by dividing the X tristimulus value by the sum of the X tristimulus value, the Y tristimulus value, and the Z tristimulus value, and the y coordinate is the Y tristimulus value, the X tristimulus value, the Y tristimulus value, and the Z tristimulus value. It can be obtained by dividing by the summed value. As such, the measured color coordinates may be expressed as (x, y), and an example of the color coordinates (x, y) is shown in FIG. 9 .

3 is an exemplary diagram of an apparatus for measuring color coordinates of a quantum dot display according to an embodiment of the present invention.

Referring to FIG. 3 , the quantum dot display 330 may receive a blue light source from the blue light source generator 340 . According to an embodiment, the blue light source generator 340 may include a white LED 342 and a BPF 341 . The BPF 341 may transmit a wavelength (eg, 430 nm to 480 nm) of a specific band of the white light source. The white LED 342 emits white light, and the emitted white light source transmits a light source of a specific wavelength (eg, a blue light source) through the BPF 341, and a light source of another wavelength (eg, a red light source, and a green light source) light source) is filtered. The blue light source passing through the BPF 341 of the blue light source generator 340 may be irradiated to the QD color filter 316 of the display 330 . Alternatively, when the color filter 315 is disposed on the top of the QD color filter 316 , the blue light source may be irradiated to the color filter 315 of the display 330 .

A color filter 315 may be disposed under the QD color filter 316 . According to an embodiment, the color filter 315 may be disposed on the QD color filter 316 according to design needs. A glass substrate 314 may be disposed at a lower end of the color filter 315 . The blue light source passing through the BPF 341 of the blue light source generating unit 340 passes through the QD color filter 316, the color filter 315, and the glass substrate 314 of the display 330 to the lens ( (not shown), the light source focused on each lens may be detected by each of the detectors 312a, 312,b, and 312c.

4 is a flowchart illustrating a process of measuring color coordinates in a quantum dot display according to an embodiment of the present invention.

Hereinafter, a process of measuring color coordinates in a quantum dot display according to an embodiment of the present invention will be described in detail with reference to FIG. 4 .

The quantum dot display 210 emits a blue light source through the quantum dot emission layer (S410). According to an embodiment, the quantum dot display 210 may emit a blue light source as a red light source and a green light source through the quantum dot emission layer. The blue light source may be a light source in which a white light source is filtered through a band pass filter (BPF) 211b and is incident on the color filter. The blue light source irradiated through the blue light source generator 211 may be emitted as a red light source and a green light source through the quantum dot (QD) emission layer 212 . In addition, the red light source transmits the red PR 213a of the color filter 213 disposed in the quantum dot display 210 , and the green light source is the color filter 213 disposed in the quantum dot display 210 . The green PR 213b may be transmitted.

The quantum dot display 210 transmits the red light source that transmits the red PR 213a of the color filter 213 and the green PR 213b of the color filter 213 from the light source emitted by the quantum dot light emitting layer 215 . A green light source can be detected (S412). The light source detector 220 of the quantum dot display 210 may detect a red light source and a green light source emitted by the quantum dot emission layer 212 . The quantum dot light emitting layer 215 is capable of emitting a blue light source as a red light source and a green light source, and as the size of the quantum dots (QD) increases from 1.2 nm to 12 nm, it changes from blue color through green color and yellow color color to red color. do. The light source detector 220 may include a lens (not shown) capable of condensing each of the red light source and the green light source.

The quantum dot display 210 may detect a blue light source that transmits the blue PR of the color filter (S414). The light source detector 220 of the quantum dot display 210 may detect a blue light source passing through the blue PR 213c of the color filter 213 . The blue light source passing through the blue PR 213c may be directly transmitted to the light source detection unit 220 without passing through the QD emission layer 212 . The light source detector 220 may include a lens capable of condensing the blue light source.

The quantum dot display 210 may measure color coordinates based on the sensed red light source, the green light source, and the blue light source (S416). The quantum dot display 210 may measure color coordinates based on <Equation 1> and <Equation 2> described above.

5 is a flowchart illustrating a process of removing interference from color coordinates measured in a quantum dot display according to an embodiment of the present invention.

Hereinafter, a process of removing interference from color coordinates measured in a quantum dot display according to an embodiment of the present invention will be described in detail with reference to FIG. 5 .

The quantum dot display 210 may receive a blue light source (S510). The blue light source may be a light source in which a white light source is filtered through a band pass filter (BPF) and is incident on the color filter 213 of the quantum dot display 210 . The blue light source may be a light source having a wavelength of a specific band (eg, 430 nm to 480 nm).

The quantum dot display 210 may measure color coordinates based on the received blue light source (S512). The blue light source is emitted from the quantum dot emission layer 212 of the quantum dot display 210 , and the emitted red and green light sources pass through the color filter 213 , and then pass through the glass substrate 214 and the light source detector 220 . is transmitted to The light source detector 220 of the quantum dot display 210 may detect a red light source and a green light source from the white light source emitted by the quantum dot light emitting layer 212 . The light source detector 220 of the quantum dot display 210 may detect a red light source and a green light source emitted by the quantum dot emission layer 212 . In addition, the light source detector 220 of the quantum dot display 210 may detect a blue light source that transmits the blue PR 213c of the color filter 213 . The light source detection unit 220 of the quantum dot display 210 may transmit the detected light source to the color coordinate measurement unit 230 , and the color coordinate measurement unit 230 may measure the color coordinates based on the detected light source. According to an embodiment, the color coordinate measuring unit 230 may measure the color coordinate based on at least a part of the red light source, the green light source, and the blue light source. The quantum dot display 210 may measure color coordinates based on <Equation 1> and <Equation 2> described above.

The quantum dot display 210 may identify whether the interference between colors in the measured color coordinates exceeds an allowable limit ( S514 ). The color coordinate measuring unit 211 of the quantum dot display 210 may determine whether interference between colors occurs due to interference between the wavelength of the blue light source and the wavelength of the green light source. According to an embodiment, the color coordinate measuring unit 211 of the quantum dot display 210 may check the color coordinate shift due to the BPF 321 . When the color coordinates are detected by irradiating the blue light source, since the half width is as wide as 30 nm or more, the color coordinates of the green light source are moved toward the region of the blue light source, so that mixed color coordinates may appear. The color coordinate measuring unit 230 of the quantum dot display 210 may detect the occurrence of interference between the blue light source and the green light source.

When it is identified that the interference between colors exceeds the allowable limit, the quantum dot display 210 may adjust the full width at half maximum (FWHM) of the blue light source to a predetermined size (S516). When it is identified that the interference generated between the wavelength of the blue light source and the wavelength of the green light source exceeds a predetermined threshold, the color coordinate measuring unit 230 of the quantum dot display 210 adjusts the half-width of the blue light source to a predetermined size (eg, : 2nm). As such, when the interference between colors exceeds the permissible limit, the process of reducing the half width of the blue light source to a predetermined size is performed at least until the interference between the wavelength of the blue light source and the wavelength of the green light source does not exceed the permissible limit. It can be done once.

The quantum dot display 210 may identify whether interference caused by the blue light source whose half width is adjusted (S518). In addition, the color coordinate measuring unit 230 of the quantum dot display 210 may identify whether interference reoccurs between the blue light source and the green light source, the half-width of which is reduced by the predetermined size (eg, 2 nm). The color coordinate measuring unit 230 reduces the half-width of the blue light source by a predetermined size (eg, 2 nm) so that interference between the wavelength of the blue light source and the wavelength of the green light source does not exceed an allowable limit, and the predetermined size The process of identifying whether interference reoccurs between the blue light source and the green light source, whose half width has been reduced by (eg, 2 nm), can be continuously performed.

6 is a flowchart illustrating a process of measuring color coordinates and removing interference generated in the measured color coordinates in a quantum dot display according to an embodiment of the present invention.

Hereinafter, a process of measuring color coordinates in a quantum dot display according to an embodiment of the present invention and removing interference generated in the measured color coordinates will be described in detail with reference to FIG. 6 .

The quantum dot display 210 may receive a blue light source having a first wavelength ( S610 ). The quantum dot display 210 may receive the blue light source of the first wavelength through a band pass filter (BPF) 211b that is filtered so that only the first wavelength passes by the light source generator 211a. The band pass filter 211b may be designed to pass only a wavelength of a specific band. For example, the band pass filter 211b allows a blue light source having a first wavelength (eg, 430 nm-480 nm) to pass through, and prevents red and green light sources having a wavelength different from the first wavelength from passing through. can be designed

The quantum dot display 210 may emit a blue light source of a first wavelength (S612). The quantum dot display 210 may transmit the red light source and the green light source emitted through the quantum dot emission layer 212 to the red PR 213a and the green PR 213b of the color filter 213 , respectively. The color filter 213 includes at least one red PR 213a transmitting a red light source, at least one green PR 213b transmitting a green light source, and at least one blue PR 213c transmitting a blue light source. can The color filter 213 may function to realize a color by absorbing light in a predetermined wavelength range from the light source and transmitting light in another wavelength range out of the predetermined wavelength range. The red light source and the green light source passing through the red PR 213a and the green PR 213b of the color filter 213 are transmitted to the light source detector 220 through the glass substrate 214, and The blue light source of the first wavelength passing through the blue PR 213c is transmitted to the light source detecting unit 220 . The quantum dot emission layer 212 may emit a blue light source as a red light source and a green light source. The quantum dot light emitting layer 212 may emit a blue light source as a red light source and a green light source based on the characteristic that the emitted color varies according to the particle size of the quantum dot. The quantum dot emission layer 212 is capable of emitting a blue light source as a white light source, and as the size of the quantum dots QD increases from 1.2 nm to 12 nm, it changes from blue color to green color, yellow color, and red color. The quantum dot emission layer 212 may transmit each of the red light source and the green light source emitted through this specification to the red PR 213a and the green PR 213b of the color filter 213 .

The quantum dot display 210 can detect the red light source passing through the red PR of the color filter, the green light source passing through the green PR of the color filter, and the blue light source passing the blue PR of the color filter from the emitted light source, respectively. There is (S614). The light source detection unit 220 may detect a red light source passing through the red PR of the color filter 213 and a green light source passing through the green PR of the color filter. Alternatively, the red light source emitted from the red PR 213a of the color filter 213 may be condensed through a lens (not shown) of the light collecting unit 221 , and then transmitted to the light source detecting unit 220 , and the color The green light source emitted from the green PR 213b of the filter 213 may be condensed through the lens ? of the light collecting unit 221 and then transmitted to the light source detecting unit 220 . The blue light source generated by the blue light source generator 211 may be transmitted to the blue PR 213c of the color filter 213 without passing through the quantum dot emission layer 212 . Alternatively, the blue light source emitted from the at least one blue PR 213c of the color filter 213 may be condensed through a lens (not shown) of the light collecting unit 221 and then transmitted to the light source detecting unit 220 . .

The quantum dot display 210 may measure color coordinates based on the detected red light source, green light source, and blue light source, respectively (S616). Based on at least a portion of the red light source, the green light source, and the blue light source detected by the light source detecting unit 220 of the quantum dot display 210 , the color coordinate measuring unit 230 may measure the color coordinates. The quantum dot display 210 may measure color coordinates based on <Equation 1> and <Equation 2> described above.

The quantum dot display 210 may identify whether interference occurs in the measured color coordinates (S618). The color coordinate measuring unit 230 of the quantum dot display 210 may determine whether interference occurs due to interference between the wavelength of the blue light source and the wavelength of the green light source. According to an embodiment, the color coordinate measuring unit 230 of the quantum dot display 210 may check the color coordinate shift due to the BPF 211b due to the occurrence of such interference. For example, in the case of detecting color coordinates by irradiating a blue light source, since the half width is as wide as 30 nm or more, the color coordinates of the green light source are moved toward the region of the blue light source, so that mixed color coordinates may appear. The color coordinate measuring unit 230 of the quantum dot display 210 may detect the occurrence of interference between the blue light source and the green light source.

The quantum dot display 210 may filter the second wavelength of the blue light source by reducing the size of the first wavelength by a predetermined size to pass therethrough ( S620 ). When the color coordinate measuring unit 230 of the quantum dot display 210 is identified that the generated interference exceeds a predetermined threshold, the full width at half maximum (460 nm) (eg, the first wavelength) of the blue light source is set to a predetermined size ( For example, after reducing by 2 nm), the band pass filter 211b may be controlled to output a blue light source having a reduced full width at half maximum (458 nm) (eg, a second wavelength). As such, when the interference between colors exceeds the permissible limit, the process of reducing the half width of the blue light source to a predetermined size is performed at least until the interference between the wavelength of the blue light source and the wavelength of the green light source does not exceed the permissible limit. It can be done once.

7A is an exemplary diagram of reducing the bandwidth of the blue light source so that the blue light source does not interfere with the green light source according to an embodiment of the present invention. 7B is an exemplary diagram illustrating a result of reducing the bandwidth of the blue light source so that the blue light source does not interfere with the green light source in the white light source according to an embodiment of the present invention.

7A and 7B, when a blue light source (460 nm) 710 is irradiated to the quantum dot emission layer 212 and color coordinates are detected through a white light source emitted from the quantum dot emission layer, the blue light source 710 Since the half width is as wide as 30 nm or more, interference with the green light source 720 occurred in the overlapping section 740 . In order to solve this interference, as a result of adjusting the half width at half maximum of the blue light source to 20 nm through the bandpass filter, interference between the blue light source 730 and the green light source 720 having a half maximum width of 20 nm did not occur. As described above, when the color coordinates are measured using a blue light source (460 nm) and the light having a center peak value lower than that is measured, there is an advantage in that the luminance of the red light source and the green light source is increased. When the color coordinates were extracted through this method, the light distribution of the C light source was used, and the tristimulus value of the 2 degree field of view was applied.

As such, the color coordinates may be shifted due to the allowable limit of the bandpass filter. [Table 1] below is a table showing the color coordinates of the blue light source when the allowable limit of the bandpass filter is moved by 2 nm.

C, 2 ⁰ Blue Area X Y Z x Y Raw Data-2nm Shift 0.4 0.1 2.4 0.1486 0.0303 Raw Data 0.4 0.1 2.3 0.1463 0.0335 Raw Data + 2nm Shift 0.4 0.1 2.2 0.1438 0.0372 MAX 0.4 0.1 2.4 0.1486 0.0372 MIN 0.4 0.1 2.2 0.1438 0.0303 Range 0.0 0.0 0.1 0.00048 0.0070 AVG. 0.4 0.1 2.3 0.1463 0.0337

As shown in [Table 1], when the wavelength of the blue light source is moved to a shorter wavelength by 2 nm, there is no change in the X tristimulus value and the Y tristimulus value, and only the Z tristimulus value changes by 0.1. Then, the x-coordinate of the blue light source is changed by 0.00023, and the y-coordinate of the blue light source is changed by 0.0032. Similarly, when the wavelength of the blue light source is shifted by 2 nm to a longer wavelength, there is no change in the X tristimulus value and the Y tristimulus value, and only the Z tristimulus value changes by 0.1. And, the x-coordinate of the blue light source is changed by 0.00025, and the y-coordinate of the blue light source is changed by 0.0037. These measurements are values obtained by emitting a QD light emitting layer by applying a bandpass of 460 nm to a white light source.

As shown in FIGS. 7A to 7B , when a blue light source having a half maximum width of at least 20 nm is used, a result obtained by mixing color coordinate values of the blue light source and the green light source is obtained. In order to solve the problem of mixing color coordinates, the color coordinates of the blue light source and the green light source can be extracted while the half width is increased by 2 nm based on 13 nm. [Table 2] below is a table showing the results of extracting the color coordinates of the blue light source and the green light source while increasing the half width by 2 nm based on 13 nm.

Green Blue Area x y x change y change amount Area x y x change y change amount FWHM 0.2243 0.7367 FWHM 0.1478 0.0274 FWHM +2 0.2239 0.7362 -0.0003 -0.0005 FWHM +2 0.1481 0.0272 0.00030.0006 -0.0002 FWHM +4 0.2236 0.7357 -0.0006 -0.0010 FWHM +4 0.1484 0.0270 0.0009 -0.0004 FWHM +6 0.2234 0.7351 -0.0009 -0.0015 FWHM +6 0.1484 0.0267 0.0012 -0.0007 FWHM +8 0.2231 0.7346 -0.0011 -0.0021 FWHM +8 0.1490 0.0265 0.0014 -0.0009 FWHM +10 0.2229 0.7340 -0.0014 -0.0027 FWHM +10 0.1492 0.0263 -0.0011 MAX 0.2243 0.7367 MAX 0.1492 0.0274 MIN 0.2229 0.7340 MIN 0.1478 0.0263 Range 0.0014 0.0027 Range 0.0014 0.0011 AVG. 0.2235 0.7354 AVG. 0.1485 0.0269

In the case of the red light source in [Table 2], there was almost no change in color coordinates according to the half width, so it was not described in [Table 2]. Therefore, when the half width has a value of 17 nm or less, it may be possible to secure color coordinate consistency.

8 is an exemplary diagram illustrating a relationship between a change in half maximum width and a change in green color coordinates according to an embodiment of the present invention.

Referring to FIG. 8 , as the half width of the green light source increases, the x and y color coordinates of the green light source decrease in inverse proportion, and the amount of change in the x color coordinate and the change amount of the y color coordinate of the green light source also decreases in inverse proportion. 8 shows that the green color coordinates change as the half width at half maximum (x-axis) of the incident light source changes, and in order to represent a value that is less than the amount of change currently required in the industry in terms of the amount of change, the reference half maximum width of 13 nm to 4 nm or less It shows that the value required by the industry can be satisfied only with the change of

9 is an exemplary diagram illustrating color coordinates according to an embodiment of the present invention.

Colors belonging to the inside of the triangle constituting the color coordinates of RGB, which are the primary colors of the display in the color coordinate system, can be expressed by appropriate mixing of RGB. Therefore, as the color coordinates of these primary colors are closer to the RGB of the pure colors, the range of colors that the display panel can express becomes wider.

In the CIE chromaticity diagram, values defined as standard color coordinates of the display by the National Television Standard Committee (NTSC), the first vertex (R1(0.7, 0.3)) 910 for the red light source, and the second vertex ( A first triangle T1 is formed by connecting coordinates expressed by G1(0.22, 0.76)) 920 and the third vertex B1(0.14, 0.03) 930 in the case of the blue light source.

In the case of detecting color coordinates according to the present invention, when the interference with the green light source is removed by reducing the half width of the blue light source by a predetermined size, the second vertex of the green light source (G1 (0.22, 0.76)) (920) is changed to the fourth vertex (G2(0.157, 0.03)) 921, and the third vertex of the blue light source (B1(0.14, 0.03)) 930 is the fifth vertex (G2(0.17, 0.75)) ( 931) is changed.

If the area of the triangle is increased by moving at least one of the first, second, and third vertices R1, G1, and B1, color reproducibility may be increased. That is, as the area of the triangle is increased, colors that can be expressed by the combination of the color filters may be further diversified.

By measuring color coordinates through a green light source and a red light source emitted through the quantum dot (QD) light emitting layer, the second and third vertices may be moved to the fourth and fifth vertices, respectively.

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in the present specification. It is obvious that variations can be made. In addition, although the effects according to the configuration of the present invention are not explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the configuration should also be recognized.

210: quantum dot display 230: color coordinate measurement unit
220: light source detection unit 214: glass substrate
212: quantum dot light emitting layer
213: color filter

Claims (14)

A method for measuring color coordinates in a quantum dot display, the method comprising:
emitting a blue light source through a quantum dot filter;
detecting a red light source passing through a red photo resist (PR) of a color filter and a green light source passing through a green PR of the color filter in the light source emitted by the quantum dot filter;
detecting a blue light source passing through the blue PR of the color filter; and
and measuring color coordinates based on at least a part of the sensed red light source, the green light source, and the blue light source.
According to claim 1,
The blue light source is a white light source is filtered through a band pass filter (BPF), characterized in that the incident to the color filter.
According to claim 1,
Measuring the color coordinates comprises:
identifying whether interference between colors exceeds a permissible limit based on the deviation of the measured color coordinates;
reducing a full width at half maximum (FWHM) of the blue light source by a predetermined size based on the interference between the colors exceeding the allowable limit; and
The method further comprising the step of measuring the color coordinates based on the half width reduced by the predetermined size.
4. The method of claim 3,
Measuring the color coordinates based on the half width reduced by the predetermined size comprises:
and repeatedly measuring based on the measured color coordinates until interference between colors does not exceed an allowable limit.
According to claim 1,
Measuring the color coordinates comprises:
receiving the detected red light source, the detected green light source, and the detected blue light source through a lens; and
The method further comprising the step of measuring the color coordinates based on at least a portion of the red light source, the green light source, and the blue light source received through the lens.
According to claim 1,
The x-coordinate of each color coordinate of the red light source, the green light source, and the blue light source is obtained by dividing the X tristimulus value by the sum of the X tristimulus values, the Y tristimulus values, and the Z tristimulus values,
The y-coordinate is obtained by dividing the Y tristimulus value by the sum of the X tristimulus value, the Y tristimulus value, and the Z tristimulus value,
The X tristimulus value, the Y tristimulus value, and the Z tristimulus value are obtained based on a standard light spectral distribution function used for color display, a maximum relative spectral luminous efficacy, an isochromatic function in the xyz color coordinate system, and a spectral solid angle transmittance. How to.
According to claim 1,
The blue light source is a light source having a specific wavelength filtered by a band pass filter.
In the device for measuring color coordinates in a quantum dot display,
color filter;
a quantum dot filter for emitting a blue light source; and
It includes a color coordinate measuring unit,
In the light source emitted by the quantum dot filter, the color coordinate measuring unit includes a red light source passing through a red photo resist (PR) of a color filter, a green light source passing through a green PR of the color filter, and a blue PR of the color filter. A device configured to measure color coordinates based on at least some of the blue light sources.
9. The method of claim 8,
The blue light source is an apparatus, characterized in that the white light source is filtered through a band pass filter (BPF) and is incident on the color filter.
9. The method of claim 8,
The color coordinate measuring unit,
Identifies whether the interference between colors exceeds a permissible limit based on the deviation of the measured color coordinates,
Based on the interference between the colors exceeds the allowable limit, reducing the full width at half maximum (FWHM) of the blue light source by a predetermined size,
An apparatus configured to measure the color coordinates based on the half width reduced by the predetermined size.
11. The method of claim 10,
The color coordinate measuring unit,
An apparatus configured to repeatedly measure, based on the measured color coordinates, until the interference between colors does not exceed an allowable limit.
9. The method of claim 8,
a lens condensing the red light source, the green light source, and the blue light source;
It includes a light source detection unit for detecting the light source condensed through the lens,
The color coordinate measuring unit,
an apparatus configured to measure the color coordinates based on at least a portion of the red light source, the green light source, and the blue light source focused through the lens.
9. The method of claim 8,
The x-coordinate of each color coordinate of the red light source, the green light source, and the blue light source is obtained by dividing the X tristimulus value by the sum of the X tristimulus values, the Y tristimulus values, and the Z tristimulus values,
The y-coordinate is obtained by dividing the Y tristimulus value by the sum of the X tristimulus value, the Y tristimulus value, and the Z tristimulus value,
The X tristimulus value, the Y tristimulus value, and the Z tristimulus value are obtained based on a standard light spectral distribution function used for color display, a maximum relative spectral luminous efficacy, an isochromatic function in the xyz color coordinate system, and a spectral solid angle transmittance. device to do.
9. The method of claim 8,
The blue light source is an apparatus, characterized in that the light source has a specific wavelength filtered by a band pass filter.

Images