CN115903307A

CN115903307A - Display panel and preparation method thereof

Info

Publication number: CN115903307A
Application number: CN202211529217.2A
Authority: CN
Inventors: 范文丽; 方涛; 曾泽村; 姚丽清; 李美莹; 陈惠�; 张天峰
Original assignee: BOE Technology Group Co Ltd; Fuzhou BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Fuzhou BOE Optoelectronics Technology Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-04-04

Abstract

The embodiment of the disclosure provides a display panel and a preparation method thereof. The display panel includes: a liquid crystal panel including a color resist; and the backlight source is positioned below the liquid crystal panel, and the matching degree between the red, green and blue spectrum of the backlight source and the red, green and blue spectrum of the color resistance meets the set matching condition. The embodiment of the disclosure can improve the saturation of the panel under low gray scale and improve the picture quality of the panel.

Description

Display panel and preparation method thereof

Technical Field

The disclosure relates to the technical field of display, and in particular relates to a display panel and a manufacturing method thereof.

Background

With the improvement of the quality of life and the continuous development of the technical level of people, the requirements on the visual effect of the display device are higher and higher. Among them, the BD Cell (double Cell) panel is a leading product of a display device, and is a product having an extremely excellent image quality. For this type of panel, it is one of its research directions to further improve its picture quality, such as contrast, saturation at low gray levels, etc.

Disclosure of Invention

The embodiment of the present disclosure provides a display panel and a manufacturing method thereof, so as to solve or alleviate one or more technical problems in the prior art.

As a first aspect of embodiments of the present disclosure, embodiments of the present disclosure provide a display panel including:

a liquid crystal panel including a color resistance;

and the backlight source is positioned below the liquid crystal panel, and the matching degree between the red, green and blue spectrum of the backlight source and the red, green and blue spectrum of the color resistance meets the set matching condition.

In a possible embodiment, the matching degree between the red, green and blue spectrums of the backlight source and the red, green and blue spectrums of the color resistances satisfies a set matching condition, which includes one or a combination of the following:

the wavelength difference value between the wavelength of the red, green and blue spectrum of the backlight source and the wavelength of the red, green and blue spectrum of the color resistance meets a set threshold value;

and the peak difference value between the peak of the red, green and blue spectrum of the backlight source and the peak of the red, green and blue spectrum of the color resistor meets a set threshold value.

In one possible embodiment, the display panel further includes a polarizer located on a side of the liquid crystal panel away from or close to the backlight source.

In one possible embodiment, the display mode of the liquid crystal panel is a normal light mode, and the polarizer is located on a side of the liquid crystal panel away from the backlight source.

In one possible embodiment, the display mode of the liquid crystal panel is an extraordinary ray mode, and the polarizer is located on one side of the liquid crystal panel close to the backlight source.

In one possible embodiment, the liquid crystal panel comprises a first liquid crystal panel and a second liquid crystal panel which are stacked, and the first liquid crystal panel is positioned on one side of the second liquid crystal panel far away from the backlight source; the first liquid crystal panel is made of high-contrast liquid crystal or negative liquid crystal, and the second liquid crystal panel is made of negative liquid crystal.

In a possible embodiment, the debugging parameter of the first liquid crystal panel is Gamma 1.2, and the debugging parameter of the second liquid crystal panel is Gamma 1.0.

In one possible embodiment, the liquid crystal panel further comprises an alignment film layer, and the material of the alignment film layer is an alignment film with a low pretilt angle.

As a first aspect of embodiments of the present disclosure, embodiments of the present disclosure provide a method of manufacturing, comprising:

determining a backlight source of a liquid crystal panel based on red, green and blue spectrums of a color resistor in the liquid crystal panel, wherein the matching degree between the red, green and blue spectrums of the backlight source and the red, green and blue spectrums of the color resistor meets a set matching condition;

and arranging the liquid crystal panel above the backlight source to obtain the display panel.

In one possible embodiment, the determining the backlight source of the liquid crystal panel based on red, green and blue spectrums of color resistances in the liquid crystal panel includes:

determining a backlight source of the liquid crystal panel among a plurality of candidate backlight sources based on a degree of matching between red, green, and blue spectra of respective backlight sources among the plurality of candidate backlight sources and red, green, and blue spectra of a color resistance in the liquid crystal panel.

In a possible embodiment, the matching degree between the red, green and blue spectrum of the backlight source and the red, green and blue spectrum of the color resistance satisfies a set matching condition, which includes one or a combination of the following:

In one possible embodiment, the method further comprises:

and arranging a polarizer on the surface of one side of the liquid crystal panel, which is far away from or close to the backlight source.

In one possible embodiment, the display mode of the liquid crystal panel is a normal light mode, and the polarizer is disposed on a surface of the liquid crystal panel on a side far from or close to the backlight source, and the method includes:

and arranging a polaroid on the surface of one side of the liquid crystal panel, which is far away from the backlight source.

In one possible embodiment, the liquid crystal panel has a display mode of an extraordinary ray mode, and the polarizer is disposed on a surface of the liquid crystal panel on a side far from or close to the backlight source, and includes:

and arranging a polaroid on the surface of one side of the liquid crystal panel close to the backlight source.

According to the technical scheme provided by the embodiment of the disclosure, the backlight source with the matching degree of the red, green and blue spectrums and the red, green and blue spectrums of the color resistance in the panel meeting the set matching condition is selected as the backlight source of the panel, so that the saturation of the panel under low gray scale can be improved, and the picture quality of the panel is improved.

The foregoing summary is provided for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present disclosure will be readily apparent by reference to the drawings and following detailed description.

Drawings

In the drawings, like reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily to scale. It is appreciated that these drawings depict only some embodiments in accordance with the disclosure and are not to be considered limiting of its scope.

Fig. 1 is a schematic diagram of a display panel according to an embodiment of the present disclosure;

FIG. 2 is a diagram illustrating a comparison between a backlight source and a color resistance according to an embodiment of the disclosure;

FIG. 3 is a graph comparing color resistances according to an embodiment of the present disclosure;

FIG. 4 is a comparison graph between backlights of an embodiment of the present disclosure;

FIG. 5 is a comparison graph between backlights of another embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a panel light transmission according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of panel light leakage according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of panel light leakage according to another embodiment of the present disclosure;

FIG. 9 is a schematic view of a panel light transmission of another embodiment of the present disclosure;

FIG. 10 is a white light contrast diagram for different polarizers according to an embodiment of the present disclosure;

FIG. 11 is a red light comparison of different polarizers according to an embodiment of the disclosure;

FIG. 12 is a green light contrast map of different polarizers according to an embodiment of the disclosure;

FIG. 13 is a comparison graph of blue light for different polarizers according to one embodiment of the present disclosure;

FIG. 14 is a red light contrast diagram for different liquid crystal materials of an embodiment of the present disclosure;

FIG. 15 is a green contrast plot of different liquid crystal materials according to an embodiment of the present disclosure;

FIG. 16 is a blue light contrast plot for different liquid crystal materials of an embodiment of the present disclosure;

FIG. 17 is a graph of light transmittance for different gammas according to an embodiment of the present disclosure;

FIG. 18 is a graph of light transmittance for different Gamma's of another embodiment of the disclosure;

FIG. 19 is a graph of light transmittance for different Gamma's according to another embodiment of the disclosure;

FIG. 20 is a graph of voltage curves for different Gamma's of an embodiment of the present disclosure;

FIG. 21 is a graph of contrast for different gammas according to an embodiment of the present disclosure;

FIG. 22 is a contrast plot for different gammas of another embodiment of the present disclosure;

FIG. 23 is a contrast plot for different gammas of another embodiment of the present disclosure;

FIG. 24 is a contrast plot for different gammas of another embodiment of the present disclosure;

fig. 25 is a flow chart of a method of making an embodiment of the present disclosure.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways, without departing from the spirit or scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

Saturation (Saturation) refers to the purity of a color and is the distinction between chromatic and achromatic colors. Monochromatic light in the visible spectrum is the most saturated colored light. Saturation is in turn understood to be the degree of how much color is contained, i.e. the degree of "grey". More specifically, the level of saturation is a result of the high and low ratio of pure color to non-color mixing. If the saturation is high, the neutral gray content is less; if the saturation is low, the ash content is high. Unsaturated, high-ash content pigments and colored inks are not vivid in color and give a "cloudy" gray feeling, but such judgment is too subjective. Saturation is expressed by a more quantitative means, and can be expressed by how much proportion of a pure (or monochromatic) component is contained in a color. As shown in FIG. 1, saturation is expressed as a percentage of WE/ME. Where E is isoenergetic white light and W is exemplified light.

In the field of display, there has been a problem that low gray scale saturation is not high. In general, the display device may be adjusted by an algorithm to improve the low gray scale saturation of the display device. However, this requires hardware and algorithmic support. As shown in fig. 2, by optimizing the display algorithm, the RGB (red green blue) signal is converted into an HSV (Hue Saturation Value) signal, and the Saturation is added to the HSV signal, so as to achieve the purpose of enhancing the color Saturation of the display image. Of course, there are other algorithms, such as histogram method and filtering method, which are commonly used to increase image quality, and these algorithms are complex in calculation, require hardware support, occupy resources, affect real-time performance, and increase project cost.

Therefore, the present disclosure provides a solution to achieve the improvement of low gray level saturation and image quality expressive force without adding additional components, processes and costs.

Fig. 1 is a display panel according to an embodiment of the disclosure.

As shown in fig. 1, the display panel includes: the liquid crystal display panel comprises a color resistor. The backlight source is positioned below the liquid crystal panel, and the matching degree between the red, green and blue spectrum of the backlight source and the red, green and blue spectrum of the color resistance meets the set matching condition.

In some embodiments, a backlight having a red-green-blue spectrum similar to that of the color-resists may be selected as the backlight for the display panel. Alternatively, a color resistance having a red-green-blue spectrum similar to that of the backlight may be selected as the color resistance of the liquid crystal panel. And selecting a backlight source and a color resistor with high red-green-blue spectrum matching degree as the backlight source and the color resistor of the liquid crystal panel. Such as light sources and color resists with similar waveforms, wavelengths or peaks.

Illustratively, the matching degree between the red, green and blue spectrum of the backlight source and the red, green and blue spectrum of the color resistance meets the set matching condition, and the matching condition comprises one or the combination of the following conditions:

the wavelength difference between the wavelength of the red, green and blue spectrum of the backlight source and the wavelength of the red, green and blue spectrum of the color resistance meets a set threshold;

the peak difference value between the peak of the red, green and blue spectrum of the backlight source and the peak of the red, green and blue spectrum of the color resistance meets a set threshold value.

The color resistance layer in the liquid crystal panel comprises a red color resistance, a green color resistance and a blue color resistance. The wavelength of red light of the backlight source is close to the spectral wavelength of the red color resistor and/or the wave crest is close, namely the wavelength difference value meets the set threshold value, and the wave crest difference value meets the set threshold value. The wavelength of the green light of the backlight source is similar to the spectral wavelength of the green color resistance and/or the peak value, namely the wavelength difference value meets the set threshold value, and the peak value difference value meets the set threshold value. The wavelength of the blue light of the backlight source is close to the spectral wavelength of the blue color resistance and/or the peak value, namely the wavelength difference value meets the set threshold value, and the peak value difference value meets the set threshold value.

As shown in fig. 2 to fig. 5, the better the matching between the backlight Unit (BLU) and the color resistance, i.e. the closer the two spectrums are transmitted through the highest point, the higher the dark field saturation. As shown in fig. 2, A1B1 of the Green color resistance Green1 is closer to AB of the backlight source than A2B2 of the absolute color resistance Green2, that is, the Green color resistance Green1 has better matching with the backlight source, so dark field saturation of the Green color resistance Green1 is better than that of the Green color resistance Green2, and fig. 3 can be viewed specifically. As shown in fig. 4, C1D1 of the backlight unit BLU3 is closer to CD of Blue color resistance Blue than C2D2 of the backlight unit BLU2, i.e. the backlight unit BLU3 is better matched with Blue color resistance Blue, so the dark field saturation of the backlight unit BLU3 is better than that of the backlight unit BLU2, which can be specifically shown in fig. 5. Therefore, the combination of the backlight source and the color resistance peak value wavelength is selected to be close to each other, so that the improvement of the dark field saturation is facilitated.

In one possible embodiment, the display panel further includes a polarizer on a side of the liquid crystal panel away from or near the backlight.

In one possible embodiment, the display mode of the liquid crystal panel is an extraordinary ray mode, and the polarizer is located on a side of the liquid crystal panel close to the backlight source.

As shown in fig. 6 to 9, after the contrast of the liquid crystal panel is improved by using the compensation Polarizer (POL), the dark field detail expression of the liquid crystal panel can be improved. Firstly, for different display modes, the compensation layer needs to be adjusted correspondingly. As shown in fig. 6 to 9, in the optical path diagram of each display mode, the natural light reaches the POL on the panel from the POL below the panel through the panel, and the optical path is S point → M1 point → M2 point → E point. As shown in fig. 6 and 9, when the point I coincides with the point E, the panel is not light-tight. On the contrary, as shown in fig. 7 and 8, the point I and the point E do not coincide with each other, and light leakage occurs in the panel. Therefore, when the display Mode of the panel is O-Mode (ordinary light Mode), the optical compensation layer or film should be located above the panel LCD, i.e. the polarizer is located on the side of the liquid crystal panel away from the backlight source. When the display mode of the panel is E-mode (extraordinary ray mode), the optical compensation layer or film should be located below the panel LCD, i.e. the polarizer is located on the side of the liquid crystal panel away from the backlight. For a double-layer panel, such as a BD Cell, the dark state effect is better when the two layers of panels are superposed after the compensation POL is used. As shown in fig. 10 to 11, the display brightness of the panel is reduced by 70% at the gray level of L0, so that the contrast ratio in the dark state can be as high as several tens of thousands to several hundreds of thousands, which is much higher than that of the common polarizer.

For fig. 6-9, the pva is a polyvinyl alcohol film. The O-TAC is cellulose triacetate and forms a polarizer with the optical compensation film. The LCD and ADS-LC are one of liquid crystal panels.

In FIGS. 10 to 11, gray represents Gray scale, CR represents contrast, normal POL represents a Normal polarizer, CR @ W represents contrast of panel white light at different Gray scales, CR @ R to Gray represent contrast of panel red light at different Gray scales, CR @ G represents contrast of panel green light at different Gray scales, and CR @ B represents contrast of blue light at different Gray scales.

In one possible embodiment, the liquid crystal panel comprises a first liquid crystal panel and a second liquid crystal panel which are stacked, and the first liquid crystal panel is positioned on one side of the second liquid crystal panel far away from the backlight source; the first liquid crystal panel is made of high-contrast liquid crystal or negative liquid crystal, and the second liquid crystal panel is made of negative liquid crystal. Wherein, the high-contrast liquid crystal is a liquid crystal with a high contrast ratio and a set threshold value.

In the double-layer panel (BD Cell), a Main panel (Main Cell) positive liquid crystal + Sub-panel (Sub Cell) negative liquid crystal is more advantageous in terms of dark field saturation than a Main Cell high contrast liquid crystal + Sub Cell negative liquid crystal. Under red, green and blue (R/G/B) pictures, the saturation of the latter is higher than that of the former. As shown in fig. 14 to 16, the luminance of the latter at the gray level L0 is small, i.e. the scattering factor is small, so that the light leakage is less under the dark field, and the dark field saturation can be effectively enhanced, so that the detail expression is better.

According to the formula

Wherein

The L0 luminance (scattering factor) is proportional to the refractive index anisotropy Δ n and the liquid crystal layer thickness d, and inversely proportional to the elastic constant Kave (where K11 is splay, K22 is twist, and K33 is bend). As can be seen from the liquid crystal parameters in table 1, the high contrast liquid crystal has an advantage in scattering factor S, and matches the measured data, as shown in fig. 14 to 16. Through liquid crystal parameter speculation, the Main negative liquid crystal + Sub negative liquid crystal has greater advantage in dark field saturation.

In fig. 14 to 16, gray represents gray scale, saturation represents Saturation, and LC represents liquid crystal. R denotes red light, G denotes green light, and B denotes blue light.

Table 1: parameters of liquid crystal of different models

	Negative liquid crystal	High contrast liquid crystal	MNT positive liquid crystal	TV positive liquid crystal
					ne	1.5696	1.5949	1.5965	1.5834
no	1.478	1.4852	1.4858	1.4861
					△n@589nm	0.0916	0.1097	0.1107	0.0973
K11	17.6	16.5	12.4	13.7
					K33	18.6	17.9	12.8	15.5
K22	8.8	8.25	6.2	6.85
					d	3.5	3.5	3.4	3.5
S	0.018184	0.028107	0.03781948	0.0259803
					CR (Single screen)	1400：1	1300：1	1000：1	1200：1

In a possible embodiment, the tuning parameter of the first liquid crystal panel is Gamma 1.2, and the tuning parameter of the second liquid crystal panel is Gamma 1.0.

Currently, the majority of double-layer panel products have a Gamma of 2.8 to 3.2. For example, main Cell Gamma2.2+ Sub Cell Gamma 1.0, however, as shown in fig. 17, there are problems of low gray scale saturation and low detail expression of the dark field picture. For solving this problem, one of the effective methods is to set the Gamma debugging parameter of the panel to 2.2. Specifically, as shown in FIG. 18, main Cell Gamma 1.2+ sub Cell Gamma 1.0. As shown in fig. 19 and fig. 20, since the voltage of Gamma2.2 at different gray levels is higher than that of Gamma3.2, and the transmittance (transmittance) is high, as shown in fig. 21 to fig. 24, the R/G/B/W contrast of Gamma2.2 at low gray levels is higher than that of Gamma3.2, which are more favorable for enhancing the improvement of detail expression in dark field.

In one possible embodiment, the liquid crystal panel further includes an alignment film layer, and the material of the alignment film layer is an alignment film with a low pretilt angle.

In order to reduce the brightness under L0, besides using liquid crystal with small scattering coefficient, the method can be realized by selecting a low pretilt angle guide film and a photo-alignment process, and the product contrast can be increased, so that the detail expressive force on a dark field is improved.

The Rubbing Shadow area exists due to the step difference between the substrates in the Rubbing process. In this region, the liquid crystal alignment is disturbed, and light leakage occurs in the panel at the gray level L0. Especially for the panel with the combination of HADS + negative liquid crystal, ADS + positive liquid crystal and high PPI, the L0 light leakage of the alignment shadow area in the long side direction of the panel pixel is more serious, and the influence on the contrast of the panel is larger. Therefore, the light alignment process is adopted in the manufacturing process of the panel to replace the friction alignment process, so that a weak area does not exist, and the contrast and dark field saturation of the panel are favorably improved.

Fig. 25 is a flow chart of a method of making an embodiment of the present disclosure. As shown in fig. 25, the method includes:

s251, determining a backlight source of the liquid crystal panel based on red, green and blue spectrums of color resistors in the liquid crystal panel, wherein the matching degree between the red, green and blue spectrums of the backlight source and the red, green and blue spectrums of the color resistors meets set matching conditions;

and S251, arranging a liquid crystal panel above the backlight source to obtain the display panel.

In one possible implementation manner, in the above S251, determining the backlight source of the liquid crystal panel based on the red, green and blue spectrums of the color resistances in the liquid crystal panel includes:

determining a backlight source of the liquid crystal panel among the plurality of candidate backlight sources based on a degree of matching between red, green, and blue spectra of each of the plurality of candidate backlight sources and red, green, and blue spectra of a color resistance in the liquid crystal panel.

In a possible embodiment, the matching degree between the red, green and blue spectrum of the backlight and the red, green and blue spectrum of the color resistance satisfies a set matching condition, which includes one or a combination of the following:

In one possible embodiment, the method further comprises:

and a polarizer is arranged on one side surface of the liquid crystal panel far away from or close to the backlight source.

In one possible embodiment, the display mode of the liquid crystal panel is a normal light mode, and a polarizer is disposed on a surface of the liquid crystal panel away from or close to the backlight source, including:

and a polarizer is arranged on the surface of one side of the liquid crystal panel, which is far away from the backlight source.

In one possible embodiment, the display mode of the liquid crystal panel is an extraordinary ray mode, and a polarizer is disposed on a surface of the liquid crystal panel away from or close to the backlight source, and the liquid crystal panel includes:

and arranging a polarizer on the surface of one side of the liquid crystal panel close to the backlight source.

The effect achieved by the preparation method provided by the embodiment of the disclosure is the same as that of the display panel, and is not described in detail herein.

As an embodiment of the present disclosure, an embodiment of the present disclosure further provides an electronic device including the display panel. The electronic equipment can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital camera, a navigator and the like.

In the present disclosure, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In the present disclosure, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The above disclosure provides many different embodiments or examples for implementing different features of the disclosure. The components and arrangements of specific examples are described above to simplify the present disclosure. Of course, they are merely examples and are not intended to limit the present disclosure. Moreover, the present disclosure may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed.

While the present disclosure has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A display panel, comprising

A liquid crystal panel including a color resistance;

2. The display panel according to claim 1, wherein the matching degree between the red, green and blue spectrum of the backlight source and the red, green and blue spectrum of the color resistance satisfies a set matching condition, which includes one or a combination of the following:

3. The display panel according to claim 1, further comprising a polarizer on a side of the liquid crystal panel remote from or close to the backlight.

4. The display panel according to claim 3, wherein the display mode of the liquid crystal panel is a normal light mode, and the polarizer is located on a side of the liquid crystal panel away from the backlight source.

5. The panel of claim 3, wherein the display mode of the liquid crystal panel is an extraordinary ray mode, and the polarizer is located on a side of the liquid crystal panel close to the backlight source.

6. The display panel according to claim 1, wherein the liquid crystal panel comprises a first liquid crystal panel and a second liquid crystal panel which are stacked, and the first liquid crystal panel is located on a side of the second liquid crystal panel away from the backlight; the first liquid crystal panel is made of negative liquid crystal or liquid crystal with the contrast ratio larger than a set threshold value, and the second liquid crystal panel is made of negative liquid crystal.

7. The display panel according to claim 6, wherein the first liquid crystal panel has a debugging parameter of Gamma 1.2, and the second liquid crystal panel has a debugging parameter of Gamma 1.0.

8. The panel of claim 1, wherein the liquid crystal panel further comprises an alignment film layer, and the alignment film layer is made of an alignment film having a pretilt angle lower than a predetermined threshold.

9. A method of making, comprising:

10. The method of claim 9, wherein determining the backlight source of the liquid crystal panel based on red, green and blue spectra of color resistances in the liquid crystal panel comprises:

determining a backlight source of the liquid crystal panel among a plurality of candidate backlight sources based on a degree of matching between red, green, and blue spectra of respective ones of the plurality of candidate backlight sources and red, green, and blue spectra of a color resistance in the liquid crystal panel.

11. The method according to claim 9, wherein the matching degree between the red, green and blue spectrum of the backlight source and the red, green and blue spectrum of the color resistance satisfies a set matching condition, which includes one or a combination of the following:

12. The method of claim 9, further comprising:

13. The method according to claim 12, wherein the display mode of the liquid crystal panel is a normal light mode, and the disposing a polarizer on a surface of the liquid crystal panel on a side far from or close to the backlight source comprises:

14. The method according to claim 12, wherein the display mode of the liquid crystal panel is an extraordinary ray mode, and the disposing a polarizer on a surface of the liquid crystal panel on a side away from or close to the backlight source comprises: