Method for realizing high luminous efficiency white balance for quantum dot health display

Abstract

The present invention proposes a method for achieving high luminous efficacy white balance for quantum dot health displays. For a display with red and green quantum dot sub-pixels and a blue sub-pixel structure without quantum dots, it follows the sequence of first ensuring the high luminous efficacy and low blue light leakage intensity of the light emission of the red and green sub-pixels, and then achieving the white balance of the three primary colors of the display. The value range of the optimal quantum dot dose factor u that can simultaneously meet the high color conversion efficiency and low blue light transmittance is proposed. After determining the u value, the h, c, and light color conversion efficiency LCE of the red and green quantum dot light color conversion layers can also be indirectly determined. This means that the red and green quantum dot sub-pixels achieve high color conversion efficiency LCE and low blue light transmittance BLT, thus achieving the purpose of high luminous efficacy and healthy display.

Description

Technical Field

[0001] The present invention belongs to the technical field of quantum dot display, and particularly relates to a method for achieving high luminous efficiency white balance for quantum dot healthy display. Background Art

[0002] An existing method for achieving white balance based on quantum dot color conversion (application number: CN202011150117.X) simply calculates the sub-pixel area ratio in order to achieve white balance of quantum dot pixels, thereby determining the area of each sub-pixel to achieve white balance display. This method does not theoretically consider whether the light color conversion efficiency of red and green quantum dots is optimal. Secondly, it does not consider reducing the blue light transmittance as much as possible to achieve a healthy display effect under the condition of satisfying white balance. Finally, it does not consider how to control the light transmittance of the blue sub-pixel without doped quantum dots. Summary of the Invention

[0003] Aiming at the defects and deficiencies of the existing technology, the present invention proposes a new method for achieving high luminous efficiency white balance for quantum dot healthy display, which is applicable to a display with red and green quantum dot sub-pixels and a blue sub-pixel structure without quantum dots excited by a blue light source, following the order of first ensuring high luminous efficiency and low blue light leakage intensity of the red and green sub-pixels, and then achieving white balance of the three primary colors of the display.

[0004] It analyzes the light color conversion efficiency LCE of the red and green sub-pixels and the optical density OD value of the blue light leakage intensity of the red and green sub-pixels, and their relationship with the quantum dot usage factor u (quantitatively represented as the product of the thickness h and the quantum dot concentration c of the quantum dots in the quantum dot light color conversion layer). On this theoretical basis, the present invention proposes the value range of the optimal quantum dot dosage factor u that can simultaneously satisfy high light color conversion efficiency and low blue light transmittance. After determining the u value, the h, c, and light color conversion efficiency LCE of the red and green quantum dot light color conversion layers can also be indirectly determined, which means that the red and green quantum dot sub-pixels achieve high light color conversion efficiency LCE and low blue light transmittance BLT, thus achieving the purpose of high luminous efficiency healthy display. On this basis, a theoretical expression for achieving white balance of a quantum dot display is further proposed, and finally, a high luminous efficiency white balance design for quantum dot healthy display can be achieved.

[0005] The present invention specifically adopts the following technical solutions:

[0006] A method for achieving high luminous efficiency white balance for quantum dot healthy display, characterized in that: it is applicable to a display with red and green quantum dot sub-pixels and a blue sub-pixel structure without quantum dots excited by a blue light source; following the order of first ensuring high luminous efficiency and low blue light leakage intensity of the red and green sub-pixels, and then achieving white balance of the three primary colors of the display, including the following steps:

[0007] Step S1: Obtain the initial parameters of the quantum dot light color conversion layer in the red and green monochromatic sub-pixels respectively;

[0008] Step S2: Construct a theoretical model of quantum dot light color conversion to obtain the theoretical expressions for the light output of the red and green quantum dot sub-pixels;

[0009] Step S3: According to the quantum dot light color conversion theory and the requirements of a healthy display for low blue light leakage intensity, establish an optimal theoretical criterion for the value of the quantum dot usage dose factor u in the red and green sub-pixels;

[0010] Step S4: Determine the key parameters and parameter matching relationships corresponding to the light color conversion layers in the red and green sub-pixels;

[0011] Step S5: Determine the magnitudes of the high light color conversion efficiency LCE values corresponding to the red and green sub-pixels;

[0012] Step S6: Establish a white balance adjustment method and a theoretical expression for a quantum dot display based on the optimal theoretical criterion for the value of u.

[0013] Further, in Step S1, obtaining the initial parameters of the quantum dot light color conversion layer in the red and green monochromatic sub-pixels respectively specifically includes: the emission spectrum parameters of the monochromatic quantum dots used, the thickness and quantum dot concentration parameters of the quantum dot light color conversion layer, the molar extinction coefficients of the basic medium material forming the light color conversion layer with respect to the incident light and the converted light respectively, and the light intensity parameters of the Lambertian surface light source.

[0014] Further, the theoretical expressions for the light output of the red and green quantum dot sub-pixels obtained through Step S2 specifically include:

[0015] The light color conversion efficiency LCE of the light output of the red and green sub-pixels and the optical density OD value reflecting the blue light leakage intensity of the red and green sub-pixels satisfy the following theoretical expressions with the quantum dot usage dose factor u:

[0016]

[0017] In the formula, LCE represents the light color conversion efficiency, k represents the proportion of blue light absorbed by the quantum dots in the incident blue light, η represents the quantum dot light color conversion efficiency, ε is the molar extinction coefficient of the material with respect to the incident light, ε’ is the molar extinction coefficient of the converted light material, OD represents the optical density, c is the quantum dot concentration, h is the thickness of the quantum dot light color conversion layer, u is the product of the thickness h of the quantum dot light color conversion layer and the quantum dot concentration c, representing the quantum dot usage dose.

[0018] Further, in step S3, according to the quantum dot photochromic conversion theory and the requirements of a healthy display for low blue light leakage intensity, the specific optimal theoretical criterion for the quantum dot usage dose factor u value in the red and green sub-pixels is as follows:

[0019] By separately changing the quantum dot usage dose u value in the red and green sub-pixels, the following specific conclusions are obtained:

[0020] 1) As the quantum dot usage dose u value increases, the blue light transmittance BLT value of the quantum dot sub-pixel decreases; 2) As the quantum dot usage dose u value increases, the optical density OD value of the quantum dot sub-pixel shows a linear increase, and the slope value of the OD curve is the corresponding molar extinction coefficient of blue light; 3) As the quantum dot usage dose u value increases, the photochromic conversion efficiency LCE value of the quantum dot sub-pixel first increases and then decreases, and there is a peak LCE of the photochromic conversion efficiency at a certain quantum dot usage dose u value. max ;

[0021] To meet the design of healthy display quantum dot pixels with high photochromic conversion efficiency and low blue light leakage intensity, the optimal value range of the quantum dot usage dose u value in the red and green quantum dot sub-pixels is determined by the following conditional expression:

[0022]

[0023] In the formula, k is the LCE proportionality coefficient of the optimal quantum dot photochromic conversion layer for healthy display, and the value range of k is between 0.7 and 1. OD' is the lowest OD value of the quantum dot photochromic conversion layer for healthy display, and the value of OD' is greater than or equal to 1.5.

[0024] When the LCE and OD values of the red and green quantum dot sub-pixels respectively meet the above conditions, it indicates that the light output of the red and green sub-pixels can simultaneously meet the requirements of high photochromic conversion efficiency and low blue light leakage intensity.

[0025] The quantum dot usage dose u value obtained through the theoretical formula is an interval value, that is, the optimal interval of the quantum dot usage dose factor u value.

[0026] Further, in step S4, the key parameters and parameter matching relationships corresponding to the respective photochromic conversion layers in the red and green sub-pixels are determined as follows:

[0027] According to the obtained theoretical expression of the u value and the u value optimal interval criterion, the value basis and value range of two key parameters, namely the thickness h and the quantum dot concentration c of the quantum dot photochromic conversion layer, are established to realize the optimized design of the red and green sub-pixels, using one of the following two methods:

[0028] 1) One-dimensional parameter adjustment method: When the value of u is determined, fix any one of the thickness h and quantum dot concentration c of the quantum dot light color conversion layer, and adjust the other parameter for design;

[0029] 2) Two-dimensional parameter adjustment method: When the value of u is determined, design by adjusting the two parameters of the thickness h and quantum dot concentration c of the quantum dot light color conversion layer at the same time.

[0030] Furthermore, in step S5, after the u values of the quantum dot usage doses of the red and green sub-pixels are determined according to the u value optimal criterion, the light color conversion efficiency LCE r value of the red sub-pixel and the light color conversion efficiency LCE g value of the green sub-pixel are also fixed, and the specific high light color conversion efficiency LCE r value of the red sub-pixel and the high light color conversion efficiency LCE g value of the green sub-pixel can be determined.

[0031] Furthermore, in step S6, establish a white balance adjustment method and theoretical expression of the quantum dot display based on the u value optimal theory criterion, specifically:

[0032] After determining the optimal u value, the high light color conversion efficiency LCE r value of the red sub-pixel and the high light color conversion efficiency LCE g value of the green sub-pixel are also determined accordingly; on the basis of ensuring that the LCE r value and the LCE g value remain unchanged, by adjusting the area ratio of the red, green, and blue primary color sub-pixels, adjust the magnitudes of the primary color stimulus values of the red, green, and blue sub-pixels, and further achieve the white balance of the quantum dot display; the specific expression is:

[0033] P r :P g :P b ∝LCE r ×S r :LCE g ×S g :k b ×S b

[0034] In the formula, P r 、P g 、P b represent the red, green, and blue primary color stimulus values respectively, and their ratio magnitudes comprehensively determine the color information and brightness information of the emitted light; LCE r 、LCE g are the conversion light efficiency values in the red and green quantum dot sub-pixels under the optimal u value respectively, and S r 、S g, S b are the areas of the red, green, and blue primary color sub-pixels respectively; k b is the blue light transmission efficiency coefficient of the blue sub-pixel, and its range is between 0 and 1;

[0035] According to the above formula, by adjusting the sub-pixel area ratio of a single pixel of the quantum dot healthy display to change P r : P g : P b The ratio of, realize the white balance effect of the light emission of the pixels of the quantum dot healthy display.

[0036] Furthermore, the implementation of the theoretical expression for white balance adjustment of the quantum dot healthy display is divided into two cases according to k b Specifically:

[0037] 1) When k b = 1, it means that the excitation intensities of the incident blue light of the red, green, and blue sub-pixels are the same. Only by adjusting the area ratio of the primary color sub-pixels can the white balance of the display be realized;

[0038] 2) When 0 < k b < 1, it means that when the excitation intensities of the incident blue light of the primary color sub-pixels are the same, due to the excessive blue light in the blue sub-pixel, it is impossible to realize the display white balance only by adjusting the area ratio of the primary color sub-pixels; At this time, k b < 1 means that it is necessary to reduce the blue light emission intensity of the blue sub-pixel to realize the white balance of the three primary colors of the display. The specific implementation methods include: reducing the driving current of the blue sub-pixel to reduce the intensity of the blue excitation light, and then reducing the blue light emission intensity of the blue sub-pixel; or by adding a barrier film or the like to the blue sub-pixel structure to absorb the excess blue light to achieve the purpose of reducing the blue light emission intensity of the blue sub-pixel.

[0039] As an equivalent replacement, this white balance implementation method is also applicable to displays with red, green, and blue primary color quantum dot sub-pixel structures excited by ultraviolet light sources.

[0040] Compared with the prior art, the present invention and its preferred solutions first theoretically ensure the high luminous efficiency and low blue light leakage intensity of the light emission of the red and green sub-pixels, and then propose a white balance theoretical formula for the purpose of healthy display on this basis; while the current healthy display technology mostly first realizes white balance and then considers reducing the blue light intensity, lacking the concept of overall consideration. In addition, the proposed healthy display white balance implementation method is not only applicable to how to adjust the white balance of the display, but also applicable to the adjustment of the display color temperature or color coordinate points in the non-white balance range.

[0041] Its main innovation points include:

[0042] 1) For the first time, a white balance implementation method and a theoretical expression for quantum dot healthy displays that can take into account both high luminous efficiency and low blue light leakage are clearly proposed.

[0043] 2) An optimal criterion for the usage dose u value of the quantum dots in the red and green quantum dot sub-pixels is proposed. From a theoretical perspective, it is clarified how to obtain the optimal value range of the quantum dots in the red and green sub-pixels that takes into account both high luminous efficiency and low blue light leakage.

[0044] 3) In the part of the red and green sub-pixels in the white balance theoretical expression, the key parameters of the corresponding color conversion layers in the red and green sub-pixels and the parameter matching relationship are clearly proposed.

[0045] 4) A specific processing method for different blue light intensities in the blue sub-pixel without quantum dots is proposed, that is, the processing method for the coefficient k of the blue sub-pixel in the theoretical expression. b of. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention will be further described in detail below with reference to the drawings and specific embodiments:

[0047] Figure 1 is a schematic diagram of the overall flow of the method according to an embodiment of the present invention;

[0048] Figure 2 is a schematic diagram of the theoretical pixel model of a healthy display white balance quantum dot that realizes high luminous efficiency and low blue light leakage intensity according to an embodiment of the present invention;

[0049] Figure 3 is a schematic diagram of establishing an optimal theoretical criterion for the usage dose factor u value of quantum dots in the red and green sub-pixels according to the quantum dot color conversion theory and the requirements of a healthy display for low blue light leakage intensity according to an embodiment of the present invention;

[0050] Figure 4 is an example diagram of the pixel structure of the red, green, and blue primary color quantum dot sub-pixels when realizing white balance under equal blue light intensity excitation according to an embodiment of the present invention;

[0051] Figure 5 is an example diagram of the pixel structure of the red, green, and blue primary color quantum dot sub-pixels when realizing white balance under non-equal blue light intensity excitation according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] To make the features and advantages of this patent more obvious and understandable, specific embodiments are given below and described in detail as follows:

[0053] To enable those skilled in the art to further understand the method proposed by the present invention, the following will be described in conjunction with specific embodiments. The present invention provides preferred embodiments, which are only used for further illustration of the present invention and should not be considered limited to the embodiments described herein, nor should it be construed as a limitation on the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art to the present invention based on the above invention content still fall within the protection scope of the present invention.

[0054] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0056] The present invention provides a method for achieving high luminous efficiency white balance for quantum dot healthy displays. It is applicable to displays with red and green quantum dot sub-pixels and a blue sub-pixel structure without quantum dots, following the sequence of first ensuring the high luminous efficiency and low blue light leakage intensity of the red and green sub-pixels, and then achieving the white balance of the three primary colors of the display. As Figure 1 shown, it specifically includes the following steps:

[0057] Step S1: Respectively obtain the initial parameters of the quantum dot light color conversion layers in the red and green monochromatic sub-pixels;

[0058] Step S2: Construct a quantum dot light color conversion theoretical model to obtain the theoretical expression of the light output of the red and green quantum dot sub-pixels;

[0059] Step S3: According to the quantum dot light color conversion theory and the requirements of a healthy display for low blue light leakage intensity, establish an optimal theoretical criterion for the value of the quantum dot usage dose factor u in the red and green sub-pixels;

[0060] Step S4: Determine the key parameters and parameter matching relationships of the corresponding light color conversion layers in the red and green sub-pixels;

[0061] Step S5: Determine the magnitude of the high light color conversion efficiency LCE value corresponding to the red and green sub-pixels;

[0062] Step S6: Establish a white balance adjustment method and theoretical expression for the quantum dot display based on the optimal theoretical criterion of the u value.

[0063] In this embodiment, it is based on a healthy display white balance quantum dot theoretical pixel model that achieves high luminous efficiency and low blue light leakage intensity. In this model, the red and green sub-pixels are respectively composed of a red quantum dot color conversion layer and a green quantum dot color conversion layer. Each conversion layer in the red and green quantum dot color conversion layers contains only one kind of monochromatic quantum dot, and the quantum dots in each quantum dot color conversion layer are evenly distributed. The short-wave light incident from the blue light source enters the quantum dot color conversion layer. A part of the incident blue light will be directly transmitted, another part of the incident blue light will be converted into monochromatic light of the corresponding wavelength by the quantum dots, and the remaining blue light will be absorbed and lost by the quantum dot color conversion layer, as Figure 2 shown.

[0064] This model determines the optimal theoretical criterion for the quantum dot usage dose u value based on the color conversion theory of the quantum dot color conversion layer, thereby determining the optimal adaptation parameters of the quantum dot color conversion layer and the color conversion efficiency LCE. Then, by combining the LCE of each quantum dot sub-pixel and the area ratio of each quantum dot sub-pixel, the white balance of the light-emitting quantum dot health display is achieved. This embodiment aims at obtaining the white balance adjustment method and theoretical expression of a quantum dot display with high luminous efficiency and low blue light leakage intensity under the guidance of the optimal criterion theory of the quantum dot usage dose u value.

[0065] The quantum dot color conversion theoretical model, namely the color conversion efficiency LCE of the red and green sub-pixels for light emission and the optical density OD value reflecting the blue light leakage intensity in the red and green sub-pixels, satisfy the following theoretical expressions with the quantum dot usage dose factor u:

[0066]

[0067] In the formula, LCE represents the color conversion efficiency, k represents the proportion of the blue light absorbed by the quantum dots in the incident blue light, η represents the quantum dot color conversion efficiency, ε is the molar absorptivity of the material with respect to the incident light, ε’ is the molar absorptivity of the material for the converted light, OD represents the optical density, c is the quantum dot concentration, h is the thickness of the quantum dot color conversion layer, and u is the product of the thickness h of the quantum dot color conversion layer and the quantum dot concentration c, representing the quantum dot usage dose.

[0068] In order to meet the healthy display quantum dot pixel design that achieves high color conversion efficiency and low blue light leakage intensity, the optimal value range of the quantum dot usage dose factor u value in each of the red and green quantum dot sub-pixels is determined by the following conditional expression:

[0069]

[0070] Wherein, k is the LCE proportionality coefficient of the optimal quantum dot light color conversion layer for healthy display, and the value range of k is between 0.7 and 1. OD’ is the lowest OD value of the quantum dot light color conversion layer for healthy display, and the value of OD’ should be greater than or equal to 1.5.

[0071] The theoretical expression for adjusting the high luminous efficiency white balance of a quantum dot display is based on the optimal u-value theory criterion. After determining the optimal u-value, by adjusting the area ratio of the red, green, and blue primary color sub-pixels, the adjustment of the stimulation values of the three primary colors of the red, green, and blue sub-pixels is realized, and then the white balance of the quantum dot display is achieved. The specific expression is:

[0072] P r :P g :P b ∝LCE r ×S r :LCE g ×S g :k b ×S b

[0073] Wherein, P r 、P g 、P b represent the stimulation values of the red, green, and blue primary colors respectively. Their ratio sizes comprehensively determine the color information and brightness information of the emitted light; LCE r 、LCE g are the conversion light efficiency values in the red and green quantum dot sub-pixels under the optimal u-value respectively, and S r 、S g 、S b are the areas of the red, green, and blue primary color sub-pixels respectively; k b is the blue light transmission efficiency coefficient of the blue sub-pixel, and its range is between 0 and 1.

[0074] Preferably, this model is applicable to a healthy display quantum dot white balance pixel model with RGB primary color sub-pixels to achieve high luminous efficiency and low blue light leakage intensity.

[0075] a: The light color conversion efficiency and optical density of the red quantum dot sub-pixel satisfy the following expression:

[0076]

[0077] Wherein, k r is the LCE r proportionality coefficient of the optimal quantum dot light color conversion layer for healthy display, and the value range of k r is between 0.7 and 1. OD r ’ is the lowest OD value of the quantum dot light color conversion layer for healthy display, and OD rThe value of '' should be greater than or equal to 1.5.

[0078] b: The light color conversion efficiency and light density of the green quantum dot sub-pixel satisfy the following expression:

[0079]

[0080] In the formula, k g is the LCE of the optimal quantum dot light color conversion layer for healthy display g proportionality coefficient, k g ranges from 0.7 to 1, OD g ' is the lowest OD value of the quantum dot light color conversion layer for healthy display, OD g 's value should be greater than or equal to 1.5.

[0081] c: Blue sub-pixel area:

[0082] Since the incident light source is blue light, there is no need for quantum dot material in the blue sub-pixel, and there is no quantum dot light color conversion process.

[0083] d: The theoretical expression of pixel white balance is as follows:

[0084] P r :P g :P b ∝LCE r ×S r :LCE g ×S g :k b ×S b

[0085] In the formula, P r 、P g 、P b represent the tristimulus values of the red, green, and blue primary colors respectively, and their ratio sizes comprehensively determine the color information and brightness information of the emitted light; LCE r 、LCE g are the conversion light efficiency values in the red and green quantum dot sub-pixels at the optimal u value respectively, S r 、S g 、S b are the areas of the red, green, and blue primary color sub-pixels respectively; k b is the blue light transmission efficiency coefficient of the blue sub-pixel, and its range is between 0 and 1.

[0086] After LCE r 、LCE g are determined by the optimal criterion of the quantum dot usage dose u value, the S r 、S g 、S bThe light output white balance is achieved by the sub-pixel area ratio. Regarding k b There are the following two cases:

[0087] 1) k b When = 1, it means that the excitation intensities of the incident blue light of the red, green, and blue sub-pixels are the same. By only adjusting the area ratio of the three primary color sub-pixels, the display white balance can be achieved.

[0088] 2) When 0 < k b < 1, it means that when the excitation intensities of the incident blue light of the three primary color sub-pixels are the same, since the blue light in the blue sub-pixel is too strong, it is impossible to achieve the display white balance only by adjusting the area ratio of the three primary color sub-pixels. At this time, k b < 1 means that it is necessary to reduce the blue light output intensity of the blue sub-pixel to achieve the three-primary color white balance of the display. The specific implementation methods include: reducing the driving current of the blue sub-pixel to reduce the intensity of the blue excitation light, thereby reducing the blue light output intensity of the blue sub-pixel; or by adding a barrier film or the like to the blue sub-pixel structure to absorb the excess blue light and achieve the purpose of reducing the blue light emission intensity of the blue sub-pixel.

[0089] The methods for reducing the blue light output intensity of the blue sub-pixel can be achieved from the perspectives of structural design, process, and circuit, including but not limited to the above adjustment methods.

[0090] In this embodiment, referring to Figure 1 the step flow chart, a theoretical relationship model is constructed for calculating the white balance light output of the healthy display quantum dot pixels that meet the high-light color conversion efficiency and low blue light leakage intensity, the sub-pixel area ratio, and the blue sub-pixel light transmittance. Specifically, it includes the following:

[0091] The first step: Obtain the initial parameters of the quantum dot light color conversion layer in the red and green monochromatic sub-pixels respectively. It includes the monochromatic quantum dot emission spectrum parameters used, the thickness of the quantum dot light color conversion layer, the quantum dot concentration parameters, the molar extinction coefficients of the basic dielectric material forming the light color conversion layer with respect to the incident light and the converted light, and the light intensity parameters of the Lambertian surface light source.

[0092] The second step: Construct a quantum dot light color conversion theoretical model to obtain the light output theoretical expressions for the red and green quantum dot sub-pixels. The light color conversion efficiency LCE of the red and green sub-pixels and the optical density OD value reflecting the blue light leakage intensity of the red and green sub-pixels satisfy the following theoretical expressions with the quantum dot usage dose factor u:

[0093]

[0094] In the formula, LCE represents the light color conversion efficiency, k represents the proportion of blue light absorbed by quantum dots in the incident blue light, η represents the quantum dot light color conversion efficiency, ε is the molar extinction coefficient of the material with respect to the incident light, ε’ is the molar extinction coefficient of the converted light material, OD represents the optical density, c is the quantum dot concentration, h is the thickness of the quantum dot light color conversion layer, and u is the product of the thickness h of the quantum dot light color conversion layer and the quantum dot concentration c, representing the quantum dot dosage.

[0095] Step 3: According to the quantum dot light color conversion theory and the requirements of a healthy display for low blue light leakage intensity, establish an optimal theoretical criterion for the value of the quantum dot dosage factor u in the red and green sub-pixels, where u is the product of the thickness h of the quantum dot light color conversion layer and the quantum dot concentration c.

[0096] In this embodiment, referring to Figure 3 and respectively changing the value of the quantum dot dosage u in the red and green sub-pixels, the specific conclusions can be obtained as follows: 1) As the value of the quantum dot dosage u increases, the blue light transmittance BLT value of the quantum dot sub-pixel decreases; 2) As the value of the quantum dot dosage u increases, the optical density OD value of the quantum dot sub-pixel shows a linear increase, and the slope value of the OD curve is the corresponding blue light molar extinction coefficient; 3) As the value of the quantum dot dosage u increases, the light color conversion efficiency LCE value of the quantum dot sub-pixel first increases and then decreases, and there is a peak LCE of the light color conversion efficiency at a certain value of the quantum dot dosage u. max .

[0097] To meet the design of a healthy display quantum dot pixel with high light color conversion efficiency and low blue light leakage intensity, it is stipulated that the optimal value range of the quantum dot dosage u value in the red and green quantum dot sub-pixels is determined by the following conditional expression:

[0098]

[0099] In the formula, k is the LCE proportionality coefficient of the optimal quantum dot light color conversion layer for a healthy display, and the value range of k is between 0.7 and 1. OD’ is the lowest OD value of the quantum dot light color conversion layer for a healthy display, and the value of OD’ needs to be greater than or equal to 1.5.

[0100] When the LCE and OD values of the red and green quantum dot sub-pixels respectively meet the above conditions, it indicates that the light output of the red and green sub-pixels can simultaneously meet the requirements of high light color conversion efficiency and low blue light leakage intensity;

[0101] The value of the quantum dot dosage u obtained through the theoretical formula is an interval value, which is also the optimal interval of the quantum dot dosage factor u value recommended by this method.

[0102] Step 4: Determine the key parameters and parameter matching relationships corresponding to the red and green sub-pixels for their respective light color conversion layers. Based on the obtained theoretical expression of the u value and the u value optimal interval criterion, establish the basis and range of values for the two key parameters, namely the thickness h of the quantum dot light color conversion layer and the quantum dot concentration c, to achieve the optimized design of the red and green sub-pixels.

[0103] 1) One-dimensional parameter adjustment method: When the u value is determined, fix any one of the parameters, namely the thickness h of the quantum dot light color conversion layer and the quantum dot concentration c, and adjust the other parameter for the design.

[0104] 2) Two-dimensional parameter adjustment method: When the u value is determined, adjust the two parameters, namely the thickness h of the quantum dot light color conversion layer and the quantum dot concentration c, simultaneously for the design.

[0105] Step 5: Determine the magnitudes of the high light color conversion efficiency LCE values corresponding to the red and green sub-pixels. After the u values of the quantum dots used in the red and green sub-pixels are determined according to the u value optimal criterion, the light color conversion efficiency LCE r value of the red sub-pixel and the light color conversion efficiency LCE g value of the green sub-pixel are also fixed, and the specific high light color conversion efficiency LCE r value of the red sub-pixel and the high light color conversion efficiency LCE g value of the green sub-pixel can be measured.

[0106] Step 6: Establish a white balance adjustment method and a theoretical expression for the quantum dot display based on the u value optimal theoretical criterion. The high light efficiency white balance adjustment theoretical expression of the quantum dot display is based on the u value optimal theoretical criterion. After determining the optimal u value, by adjusting the area ratio of the red, green, and blue primary color sub-pixels, the adjustment of the magnitudes of the three primary color stimulus values of the red, green, and blue sub-pixels is realized, and thus the white balance of the quantum dot display is achieved. The specific expression is:

[0107] P r :P g :P b ∝LCE r ×S r :LCE g ×S g :k b ×S b

[0108] In the formula, P r 、P g 、P b represent the three primary color stimulus values of red, green, and blue respectively. Their ratio magnitudes comprehensively determine the color information and brightness information of the emitted light; LCE r 、LCE gare the conversion light efficiency values in the red and green quantum dot sub-pixels at the optimal u value, respectively, S r 、S g 、S b are the areas of the red, green, and blue primary color sub-pixels respectively; k b is the blue light transmission efficiency coefficient of the blue sub-pixel, and its range is between 0 and 1.

[0109] According to the above formula, by adjusting the sub-pixel area ratio of a single pixel of the quantum dot health display, P r : P g : P b 's ratio can be changed to achieve the white balance effect of the light output of the pixels of the quantum dot health display.

[0110] The implementation of the theoretical expression for white balance adjustment of the quantum dot health display is divided into two cases according to k b as follows:

[0111] 1) When k b = 1, it means that the excitation intensities of the incident blue light of the red, green, and blue sub-pixels are the same. By simply adjusting the area ratio of the primary color sub-pixels, the white balance of the display can be achieved.

[0112] 2) When 0 < k b < 1, it means that when the excitation intensities of the incident blue light of the primary color sub-pixels are the same, due to the excessive blue light in the blue sub-pixel, it is impossible to achieve the display white balance only by adjusting the area ratio of the primary color sub-pixels. At this time, k b < 1 means that it is necessary to reduce the blue light output intensity of the blue sub-pixel to achieve the white balance of the three primary colors of the display. The specific implementation methods include: reducing the driving current of the blue sub-pixel to reduce the intensity of the blue excitation light, thereby reducing the blue light output intensity of the blue sub-pixel; or by adding a barrier film or the like to the blue sub-pixel structure to absorb the excess blue light and achieve the purpose of reducing the blue light emission intensity of the blue sub-pixel.

[0113] In this embodiment, referring to Figure 4 , it is an example diagram of the pixel structure of the red, green, and blue primary color quantum dot sub-pixels when achieving white balance under the excitation of equal blue light intensity. Since k b = 1, the blue light output intensity of the blue sub-pixel is much greater than that of other sub-pixels under the same pixel area. In order to achieve white balance, the area of the blue sub-pixel will be too small.

[0114] In this embodiment, referring to Figure 5, which is an example diagram of the pixel structure of the red, green, and blue primary color quantum dot sub-pixels when achieving white balance under non-equal blue light intensity excitation. This healthy quantum dot pixel model is based on the white balance adjustment theoretical expression of the quantum dot display under the optimal theoretical criterion of the quantum dot usage dose u value. When the blue light transmission efficiency coefficient k of the blue sub-pixel b satisfies 0 < k b < 1, the sub-pixel area ratio of a single pixel of the quantum dot healthy display is adjusted to change P r : P g : P b ratio to achieve healthy display white balance light emission. This non-equal area white balance pixel model design can avoid the situation of too small an area of the blue sub-pixel and has the characteristics of healthy display such as meeting high light color conversion efficiency and low blue light leakage intensity.

[0115] Based on the design idea of the present invention, the method of reducing the light emission intensity of the blue sub-pixel can be achieved from the perspectives of structural design, process, and circuit, including but not limited to the above adjustment methods.

[0116] The description of the above embodiments is only used to help understand the method and its core idea of the present invention. At the same time, the above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for realizing high luminous efficacy white balance for quantum dot health display, characterized in that: For a display with a structure of red and green quantum dot sub-pixels and a blue sub-pixel without quantum dots excited by a blue light source; following the sequence of first ensuring the high luminous efficiency and low blue light leakage intensity of the red and green sub-pixels, and then achieving the white balance of the three primary colors of the display, including the following steps: Step S1: Obtain the initial parameters of the quantum dot light color conversion layers in the red and green monochromatic sub-pixels respectively; Step S2: Construct a quantum dot light color conversion theoretical model to obtain the theoretical expression for the light output of the red and green quantum dot sub-pixels; Step S3: According to the quantum dot light color conversion theory and the requirements of a healthy display for low blue light leakage intensity, establish an optimal theoretical criterion for the quantum dot usage dose factor u value in the red and green sub-pixels; Step S4: Determine the key parameters and parameter matching relationships corresponding to the light color conversion layers in the red and green sub-pixels; Step S5: Determine the magnitudes of the high light color conversion efficiency LCE values corresponding to the red and green sub-pixels; Step S6: Establish a white balance adjustment method and theoretical expression for the quantum dot display based on the optimal theoretical criterion of the u value; The theoretical expression for the light output of the red and green quantum dot sub-pixels obtained through Step S2 specifically includes: The light color conversion efficiency LCE of the light output of the red and green sub-pixels and the optical density OD value reflecting the blue light leakage intensity of the red and green sub-pixels, and they satisfy the following theoretical expression with the quantum dot usage dose factor u: In the formula, LCE represents the light color conversion efficiency, k represents the proportion of blue light absorbed by the quantum dots in the incident blue light, η represents the quantum dot light color conversion efficiency, ε is the molar absorptivity of the material for the incident light, ε’ is the molar absorptivity of the material for the converted light, OD represents the optical density, c is the quantum dot concentration, h is the thickness of the quantum dot light color conversion layer, u is the product of the thickness h of the quantum dot light color conversion layer and the quantum dot concentration c, representing the quantum dot usage dose; In Step S3, according to the quantum dot light color conversion theory and the requirements of a healthy display for low blue light leakage intensity, the specific establishment of the optimal theoretical criterion for the quantum dot usage dose factor u value in the red and green sub-pixels is: Respectively change the quantum dot usage dose u value in the red and green sub-pixels, and the specific conclusions are: 1) As the value of the quantum dot usage dose u increases, the blue light transmittance BLT value of the quantum dot sub-pixel decreases; 2) As the value of the quantum dot usage dose u increases, the optical density OD value of the quantum dot sub-pixel shows a linear increase, and the slope value of the OD curve is the corresponding blue light molar extinction coefficient; 3) As the value of the quantum dot usage dose u increases, the light color conversion efficiency LCE value of the quantum dot sub-pixel first increases and then decreases, and there is a peak LCE of the light color conversion efficiency at a certain value of the quantum dot usage dose u max ; To meet the healthy display quantum dot pixel design for achieving high light color conversion efficiency and low blue light leakage intensity, the optimal value range of the quantum dot usage dose u value in the red and green quantum dot sub-pixels is determined by the following conditional expression: In the formula, k is the LCE proportionality coefficient of the optimal quantum dot light color conversion layer for healthy display, and the value range of k is between 0.7 - 1, OD’ is the lowest OD value of the quantum dot light color conversion layer for healthy display, and the value of OD’ is greater than or equal to 1.5; When the LCE and OD values of the red and green quantum dot sub-pixels respectively meet the above conditions, it indicates that the light output of the red and green sub-pixels can simultaneously meet the requirements of high light color conversion efficiency and low blue light leakage intensity; The quantum dot usage dose u value obtained through the theoretical formula is an interval value, that is, the optimal interval of the quantum dot usage dose factor u value; In step S4, the specific determination of the key parameters and parameter matching relationships corresponding to the red and green sub-pixels for their respective light color conversion layers is as follows: Based on the obtained theoretical expression of the u value and the u value optimal interval criterion, the value basis and value range of two key parameters, namely the thickness h of the quantum dot light color conversion layer and the quantum dot concentration c, are established to achieve the optimized design of the red and green sub-pixels. One of the following two methods is adopted: 1) One-dimensional parameter adjustment method: When the u value is determined, fix any one of the parameters of the thickness h of the quantum dot light color conversion layer and the quantum dot concentration c, and adjust the other parameter for design; 2) Two-dimensional parameter adjustment method: When the u value is determined, adjust the two parameters of the thickness h of the quantum dot light color conversion layer and the quantum dot concentration c simultaneously for design; In step S6, the white balance adjustment method and the theoretical expression of the quantum dot display based on the u value optimal theory criterion are established as follows: After determining the optimal u value, the high-light color conversion efficiency LCE of the red sub-pixel r value and the high-light color conversion efficiency LCE of the green sub-pixel g value are also determined accordingly; on the basis of ensuring that the LCE r value and the LCE g value remain unchanged, by adjusting the area ratio of the red, green, and blue primary color sub-pixels, the adjustment of the primary color stimulus values of the red, green, and blue sub-pixels is realized, and then the white balance of the quantum dot display is realized; the specific expression is: P r :P g :P b ∝LCE r ×S r :LCE g ×S g :k b ×S b Wherein, P r , P g , P b respectively represent the red, green, and blue primary color stimulus values, and the ratio of them comprehensively determines the color information and brightness information of the emitted light; LCE r , LCE g are respectively the conversion light efficiency values in the red and green quantum dot sub-pixels at the optimal u value, S r , S g , S b are respectively the areas of the red, green, and blue primary color sub-pixels; k b is the blue light transmission efficiency coefficient of the blue sub-pixel, and its range is between 0 and 1; According to the above formula, by adjusting the sub-pixel area ratio of a single pixel of the quantum dot health display to change P r : P g : P b ratio, the white balance effect of the light output of the pixels of the quantum dot health display is achieved; Implementation of the theoretical expression for white balance adjustment of quantum dot health monitors according to k b It is divided into two cases, specifically: 1) k b When k = 1, it means that the excitation intensities of the incident blue light of the three sub-pixels of red, green, and blue are the same. By only adjusting the area ratio of the three primary color sub-pixels, the white balance of the display can be achieved. 2) 0 < k b <When it is less than 1, it means that when the incident blue light excitation intensities of the three primary color sub-pixels are the same, since the blue light in the blue sub-pixel is too strong, it is impossible to achieve display white balance only by adjusting the area ratio of the three primary color sub-pixels; at this time, k b <less than 1 indicates that it is necessary to reduce the blue light emission intensity of the blue sub-pixel to achieve the white balance of the three primary colors of the display. The specific implementation methods include: reducing the driving current of the blue sub-pixel to reduce the intensity of the blue excitation light, and then reducing the light emission intensity of the blue sub-pixel; or by adding a barrier film or the like to the blue sub-pixel structure to absorb the excess blue light and achieve the purpose of reducing the blue light emission intensity of the blue sub-pixel.

2. The high - efficiency white - balance implementation method for quantum - dot health display according to claim 1, wherein: In step S1, the initial parameters of the quantum dot light color conversion layer in the red and green monochromatic sub-pixels are respectively obtained, specifically including: the monochromatic quantum dot emission spectrum parameters used, the thickness and quantum dot concentration parameters of the quantum dot light color conversion layer, the molar extinction coefficients of the basic medium materials forming the light color conversion layer with respect to the incident light and the converted light, and the light intensity parameters of the Lambertian surface light source.

3. The high-light-efficiency white balance implementation method for quantum dot health display according to claim 1, wherein: In step S5, after the usage doses u values of the quantum dots of the red and green sub-pixels are determined according to the u value optimal criterion, the light color conversion efficiency LCE of the red sub-pixel r value and the light color conversion efficiency LCE of the green sub-pixel g value are also fixed, and thus the specific high light color conversion efficiency LCE of the red sub-pixel r value and the high light color conversion efficiency LCE of the green sub-pixel g value can be determined.

4. The high-efficiency white balance implementation method for quantum dot health display according to claim 1, characterized in that: The excitation light source of the display is an ultraviolet light source, and the display is a display with a quantum dot sub-pixel structure of red, green, and blue primary colors respectively.

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