CN111273479A - Display panel and display device - Google Patents

Abstract

The present invention provides a display panel and a display device. The display panel includes: a first substrate and a second substrate arranged in a cell; a liquid crystal layer arranged between the first substrate and the second substrate; a reflective film on the side of the second substrate facing the first substrate; a transparent electrode structure located between the first substrate and the second substrate, when the transparent electrode structure does not form an electric field, the The display panel is in a dark state; when the transparent electrode structure forms an electric field, the display panel is in a bright state; wherein, the liquid crystal layer includes: a liquid crystal matrix and functional material molecules mixed with the liquid crystal matrix, the functional material molecules Used to absorb light in a predetermined wavelength band. The display panel and the display device provided by the present invention can improve the problem of light leakage in the dark state and improve the product contrast.

Description

A display panel and display device

technical field

The present invention relates to the field of display technology, and in particular, to a display panel and a display device.

Background technique

Total reflection LCD (Liquid Crystal Display) products do not need a backlight source, and have the advantages of low power consumption, light weight and small size, and have huge market prospects. In the related art, total reflection LCD products can be classified into normally white display and normally black display according to the display mode. Among them, the total reflection LCD product in the normally black display mode is lower in cost than the total reflection LCD product in the normally white display mode. However, the normally black display mode has the problems of dark state light leakage and low contrast ratio (CR).

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a display panel and a display device, which can improve the problem of light leakage in dark state and improve product contrast.

The technical scheme provided by the present invention is as follows:

A display panel, comprising:

a first substrate and a second substrate arranged on the box;

a liquid crystal layer disposed between the first substrate and the second substrate;

a reflective film disposed on the side of the second substrate facing the first substrate;

A transparent electrode structure located between the first substrate and the second substrate, the transparent electrode structure is used to form an electric field for driving liquid crystal deflection, wherein when the transparent electrode structure does not form an electric field, the display panel is dark When the transparent electrode structure forms an electric field, the display panel is in a bright state;

Wherein, the liquid crystal layer includes: a liquid crystal matrix and functional material molecules mixed with the liquid crystal matrix, the functional material molecules have the same orientation as the liquid crystal matrix, and are used to absorb light in a predetermined wavelength band.

Exemplarily, the liquid crystal layer is a dye liquid crystal layer, and the functional material molecules include dichroic dye molecules.

Exemplarily, in the dye liquid crystal layer, the weight ratio of the dichroic dye molecules to the liquid crystal precursor is (0.1-5):100.

Exemplarily, the dichroic dye molecules include black dye molecules, and when the black dye molecules are used in the transparent electrode structure to form an electric field, they are in a state of vertical orientation perpendicular to the first substrate, and in the transparent When no electric field is formed, the electrode structure is in a horizontal orientation state parallel to the first substrate, and absorbs low-wavelength light with a wavelength range of 380-450 nm.

Exemplarily, the functional material molecules include up-conversion material molecules, which are used to be in a horizontal alignment state parallel to the first substrate when the transparent electrode structure does not form an electric field, and when the transparent electrode structure forms an electric field, It is in a vertical orientation state perpendicular to the first substrate, absorbs low-energy light with a first wavelength band, and emits high-energy light with a second wavelength band, wherein the wavelength of the first wavelength band is greater than the wavelength of the second wavelength band wavelength;

Alternatively, the functional material molecules include down-conversion material molecules, and when the transparent electrode structure forms an electric field, it is in a vertical orientation state perpendicular to the first substrate, and when the transparent electrode structure does not form an electric field, it is in a state of vertical alignment with the first substrate. The first substrate is in a parallel orientation state, absorbs high-energy light with a third wavelength band, and emits low-energy light with a fourth wavelength band, wherein the wavelength of the third wavelength band is smaller than the wavelength of the fourth wavelength band .

Exemplarily, the display panel is a total reflection liquid crystal display panel or a transflective liquid crystal display panel.

Exemplarily, the first substrate is a color filter substrate, and the second substrate is an array substrate.

Exemplarily, the transparent electrode structure includes: a first transparent electrode and a second transparent electrode; the first transparent electrode is located on the side of the first substrate facing the second substrate, and the second transparent electrode is located on the side of the first substrate facing the second substrate. The second substrate faces the side of the first substrate; and the display panel further includes: a first alignment layer on the side of the first substrate facing the second substrate, and a first alignment layer on the side of the second substrate facing the second substrate The second alignment layer on one side of the first substrate.

A display device includes: the above-mentioned display panel.

Exemplarily, the display device is a normally black liquid crystal display device, further comprising:

a half-wave plate disposed on a side of the first substrate away from the second substrate;

an upper polarizer disposed on a side of the half-wave plate away from the first substrate.

The technical effect that the present invention brings is as follows:

In the above scheme, functional material molecules are doped into the liquid crystal layer, and the functional material molecules can have good compatibility with the liquid crystal matrix without affecting the properties of the liquid crystal, and can maintain the parallel arrangement with the orientation of the liquid crystal matrix, Wherein, when the transparent electrode structure is not electrified, the functional material molecules and the liquid crystal matrix are arranged horizontally, and when the transparent electrode structure is electrified, the functional material molecules and the liquid crystal matrix are vertically arranged, and the functional material Molecules can absorb light in a predetermined wavelength band in a predetermined orientation state. For example, the functional material molecules doped in the liquid crystal layer can be in a horizontal orientation state parallel to the first substrate when the transparent electrode structure is not powered on, and absorb low wavelength bands. light to reduce the reflectivity of the dark state; alternatively, the functional material molecules can also be in a state of vertical orientation perpendicular to the first substrate when the transparent electrode structure is powered on, and can absorb high-band light and emit low-frequency light. The light in the wavelength band can improve the reflectivity of the bright state; or, the functional material molecules can also be in a parallel orientation state parallel to the first substrate when the transparent electrode structure is not powered, and absorb the light in the low band and emit it. High-band light to reduce the reflectivity of the dark state, etc. In this way, functional material molecules can be incorporated into the liquid crystal layer to adjust the reflectivity of the dark state and/or the bright state, so as to change the dark state and/or The display brightness in the bright state, thereby changing the contrast ratio CR of the display panel.

Description of drawings

Fig. 1 shows the structural schematic diagram of a total reflection display product in a normally black display mode in a dark state in the related art;

FIG. 2 shows a schematic structural diagram of a normally black display mode total reflection display product in a white state in the related art;

Fig. 3 shows the ideal optical path design diagram of the total reflection display product of the normally black display mode in the dark state in the related art;

Fig. 4 shows the ideal optical path design diagram of the normally black display mode in the white state of the total reflection display product in the related art;

Fig. 5 shows the optical path diagram of L0 light leakage generated by a total reflection display product in a normally black display mode in the related art;

FIG. 6 is a schematic structural diagram of a display panel in a dark state in an exemplary embodiment of the present invention;

FIG. 7 shows a schematic structural diagram of a display panel in a white state in an exemplary embodiment of the present invention;

Figure 8 is a schematic diagram showing the simulated relationship between the voltage applied on the transparent electrode structure and the reflectivity of light with different wavelengths in the normally black total reflection display product. The reflectivity curve of light, curve c is the average extraction variance value of visible light wavelength, curve d is the reflectivity curve of light with a wavelength of 580nm, curve e is the reflectivity curve of light with a wavelength of 670nm, and curve f is the reflectance curve of light with a wavelength of 760nm The reflectance curve of light.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

Unless otherwise defined, technical or scientific terms used in this disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in this disclosure, "first," "second," and similar terms do not denote any order, quantity, or importance, but are merely used to distinguish the various components. Likewise, words such as "a," "an," or "the" do not denote a limitation of quantity, but rather denote the presence of at least one. "Comprises" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

Before describing the display panel and the display device provided by the embodiments of the present invention, it is necessary to describe the related technology as follows:

In the related art, the total reflection display product can be divided into a normally white display mode and a normally black display mode according to the display mode. The total reflection display product structure of normally white display mode is: polarizing layer + half glass + quarter glass + total reflection LCD screen; the total reflection product structure of normally black mode: polarizing layer + half glass + total reflection liquid crystal Screen. In the BOMLIST (component list) of the total reflection display product, the cost of the polarizer accounts for about half of the cost. It can be seen from the comparison that the total reflection display product in the normally black display mode does not need a quarter glass in the polarizer structure. The cost of the product has a great advantage. However, the normally black total reflection display products have a bright state reflectivity of about 15% to 16%, a dark state reflectivity of about 1.58%, and a contrast ratio (CR) of about 10, while the total reflection display products of the normally white display mode have a contrast ratio of CR. It can reach about 20, and the dark state reflectivity is 1% or even below 1%.

FIG. 1 and FIG. 2 are schematic structural diagrams of normally black total reflection display products in the related art. As shown in FIG. 1 and FIG. 2 , the normally black total reflection display product includes an upper substrate 1 , a lower substrate 2 , a liquid crystal layer 3 disposed between the upper substrate 1 and the lower substrate 2 , and a reflective film located on the upper surface of the lower substrate 2 4. The transparent electrode structure for forming the electric field (not shown in the figure), the half-wave plate 5 on the upper substrate 1 and the upper polarizer 6 on the half-wave plate 5, when the transparent electrode structure is not powered on, The liquid crystal molecules are arranged in parallel orientation, and the polarization direction of the reflected light is perpendicular to the polarization direction of the polarizer, which cannot be transmitted through and displays black (as shown in Figure 1). When the transparent electrode structure is powered on, the liquid crystal molecules change from horizontal orientation to vertical orientation. The liquid crystal layer does not modulate the light, the polarization direction of the reflected light is parallel to the polarization direction of the polarizer, the light can pass through, and it is displayed in white (as shown in Figure 2). The ideal optical path design diagrams of the normally black total reflection display products in the above related technologies are shown in Figures 3 and 4:

As shown in Figure 3, when the black state and transparent electrode structure is not powered, the incident light passes through the polarizer (Polarizer, referred to as Pol) to form polarized light, the Pol transmission axis polarization direction is 15°, and the angle of 1/2 glass is 120° °, the included angle with the polarization direction of the polarized light is 75°, and the 1/2 glass rotates the polarization direction of the polarized light by twice the included angle. At this time, the polarization direction of the polarized light is 45°. The liquid crystal layer is equivalent to a 1/4 glass slide, and the function of the 1/4 glass slide is to turn linearly polarized light at an angle of 45° into circularly polarized light. Therefore, the linearly polarized light becomes left-handed circularly polarized light through the liquid crystal layer, and the circularly polarized light becomes right-handed circularly polarized light through the reflective metal. The reflected right-handed circularly polarized light passes through the liquid crystal layer and becomes linearly polarized light. The polarization direction is 135°, and the angle between it and the 1/2 glass is 30°. After passing through the 1/2 glass, the direction of the polarized light changes. At 105°, the polarization direction of the origin light is orthogonal to the transmission axis of the polarizer, so the light cannot pass through, showing a dark state mode;

As shown in Figure 4, when the white state and transparent electrode structure is powered on, the liquid crystal molecules change from horizontal orientation to vertical orientation, which does not modulate light. The 45° polarized light is still 45° polarized light through the reflective layer. After passing through 1/2 glass, the polarization direction is 15°, which is just parallel to the transmission axis of the polarizer, showing a bright state.

However, the actual natural light is broadband light, which is limited by the properties of the liquid crystal cell, and the liquid crystal cell has different modulation effects on light of different wavelengths. For the low-band light in the range of 380-450 nm, the reflectivity is high, resulting in light leakage in the dark state. After the band light is compensated by the liquid crystal cell, it is not all circularly polarized light, and the light exiting the liquid crystal cell is also elliptically polarized light (the ideal optical path model is circularly polarized light), and no pure line-to-circle conversion is performed, resulting in L0 light leakage. The dark-state optical path diagram is shown in Figure 5.

It can be found that the main problem of low contrast CR of normally black total reflection products is limited to the influence of factors such as process and polarization degree of polarizer. The CR of the product is low. Therefore, how to achieve a lower reflectivity in the dark state and reduce the overall display brightness under the condition of the dark state plays an important role in improving the contrast ratio CR of the normally black all-reflection product.

In order to solve the above problems, embodiments of the present invention provide a display panel and a display device, which can improve the problem of light leakage in a dark state and improve product contrast.

The display panel provided in the embodiments of the present invention will be described in detail below.

As shown in FIG. 6 and FIG. 7 , the display panel provided in the embodiment of the present invention includes:

the first substrate 100 and the second substrate 200 arranged in the cell;

a liquid crystal layer 300 disposed between the first substrate 100 and the second substrate 200;

a reflective film 400 disposed on the side of the second substrate 200 facing the first substrate 100;

A transparent electrode structure located between the first substrate 100 and the second substrate 200, the transparent electrode structure is used to form an electric field for driving liquid crystal deflection, wherein when the transparent electrode structure does not form an electric field, the display panel is dark state; when the transparent electrode structure forms an electric field, the display panel is in a bright state;

The liquid crystal layer 300 includes a liquid crystal matrix 310 and functional material molecules 320 mixed with the liquid crystal matrix 310 . The functional material molecules 320 have the same orientation as the liquid crystal matrix 310 and are used to absorb light in a predetermined wavelength band.

In the above solution, functional material molecules 320 are mixed into the liquid crystal matrix 310 of the liquid crystal layer 300, and the functional material molecules 320 can have good compatibility with the liquid crystal matrix 310, and will not affect the performance of the liquid crystal, which can be maintained. Parallel arrangement with the orientation of the liquid crystal matrix 310, wherein when the transparent electrode structure is not powered on, the functional material molecules are horizontally aligned with the liquid crystal matrix, and when the transparent electrode structure is powered on, the functional material molecules and the liquid crystal matrix are both. Vertical alignment, and the functional material molecules can absorb light in a predetermined wavelength band in a predetermined orientation state. For example, the functional material molecules doped in the liquid crystal layer can be horizontally parallel to the first substrate when the transparent electrode structure is not powered. Or, the functional material molecules can also be in a vertical orientation state perpendicular to the first substrate when the transparent electrode structure is powered on, and can absorb The high-band light emits low-band light to improve the reflectivity of the bright state; or, the functional material molecules can also be in a parallel orientation state parallel to the first substrate when the transparent electrode structure is not powered, And absorb low-band light and emit high-band light to reduce the reflectivity of the dark state, etc. In this way, functional material molecules can be incorporated into the liquid crystal layer to adjust the reflectivity of the dark state and/or bright state. , to change the display brightness in the dark state and/or the bright state, thereby changing the contrast ratio CR of the display panel.

The display panel provided by the embodiments of the present invention will be described in detail below.

In an exemplary embodiment, the liquid crystal layer 300 is a dye liquid crystal layer 300, and the functional material molecules 320 include dichroic dye molecules.

In the above scheme, in order to solve the problem of light leakage in the dark state and reduce the reflectivity of the dark state, dichroic dye molecules can be incorporated into the liquid crystal matrix 310, and the dye molecules can have good compatibility with the liquid crystal matrix 310, and The performance of the liquid crystal matrix 310 will not be affected, and the parallel alignment with the orientation of the liquid crystal matrix 310 can be maintained. As shown in Figure 6. When the transparent electrode structure is not electrified, the dye molecules are aligned in parallel with the liquid crystal matrix 310. At this time, when the light propagation direction is perpendicular to the long axis of the liquid crystal matrix 310, the dye molecules play the role of absorbing light and play the role of the dye molecules. , can absorb the low-band light. The light of this band passes through the dye liquid crystal layer 300 to form elliptically polarized light, which affects the reflectivity of the dark state. The light passing through the dye liquid crystal layer 300 can form a relatively perfect light because the low-band light is reduced. Circularly polarized light forms an optical path closer to the ideal optical path, thereby greatly reducing the reflectivity of the dark state (for example, it can be reduced from the existing 1.58 to below 0.5); as shown in Figure 7, when the transparent electrode structure is powered on , the dye molecules are re-aligned with the liquid crystal matrix 310, from horizontal arrangement to vertical arrangement. At this time, the light propagation direction is parallel to the long axis of the liquid crystal matrix 310, and the dye molecules have a weak influence on the light. The influence of reflectivity is very small (the influence of dye molecules on the dark state is far greater than the influence on the bright state), thereby significantly improving the CR of normally black total reflection products.

For the dye liquid crystal layer 300, certain requirements are imposed on the dye molecules. Since the liquid crystal cell in the normally black total reflection product in the related art has better compensation for the light in the high waveband, the formed optical path is close to the ideal optical path, and the compensation for the light in the low waveband is poor. Therefore, in an exemplary embodiment, The ratio of the dye molecules to the light absorption of the low wavelength band is higher; and, in order to reduce the influence of the dye molecules on the bright state, the ratio of the dye molecules doped with the liquid crystal matrix 310 cannot be too high. In an exemplary embodiment, the In the dye liquid crystal layer 300, the weight ratio of the dichroic dye molecules to the liquid crystal matrix 310 is (0.1-5):100, and the dye molecules and the matrix liquid crystal have good compatibility.

In an exemplary embodiment, the dichroic dye molecules include black dye molecules, and the black dye molecules are in a vertical orientation perpendicular to the first substrate when the transparent electrode structure is used to form an electric field When the electric field is not formed, the transparent electrode structure is in a horizontal orientation state parallel to the first substrate, and absorbs low-wavelength light with a wavelength range of 380-450 nm.

With the above solution, in the related art, for normally black total reflection products, the light compensation for the low-band light of 380-450 nm is poor, and there are problems of bluish dark state and light leakage. The chromatic dye molecules can be selected from black dye molecules, so as to absorb the low-band light in the wavelength range of 380-450 nm.

It should be noted that, in practical applications, the dichroic dye molecules can also use other color dye molecules other than black dye molecules to absorb light in other wavelength bands. For example, if the dark state of the display panel is not black, The dyes can be selected in a variety of ways to achieve a variety of dark-state color displays.

In addition, in another exemplary embodiment provided by the present invention, the functional material molecules 320 include up-conversion material molecules, which are used to be perpendicular to the first substrate when the transparent electrode structure forms an electric field vertical orientation state, and absorbs low-energy light with a first wavelength band and emits high-energy light with a second wavelength band, wherein the wavelength of the first wavelength band is greater than the wavelength of the second wavelength band, that is, the absorption is high light in the lower band, and emits light in the lower band.

Using the above scheme, the functional material molecules 320 can also be up-conversion material molecules. Up-conversion material means that the material is excited by low-energy light and emits high-energy light, that is, it is excited by light with long wavelength and low frequency. , the material emits light with short wavelengths and high frequencies. The molecules of the up-conversion material can have good compatibility with the liquid crystal matrix 310 , and will not affect the performance of the liquid crystal matrix 310 , and can maintain parallel alignment with the liquid crystal matrix 310 . When the transparent electrode structure is not powered, when the molecules of the up-conversion material are aligned in parallel with the liquid crystal matrix 310 , and when the light propagation direction is perpendicular to the long axis of the liquid crystal matrix 310 , the molecules of the up-conversion material play the role of the molecules of the up-conversion material. , which can absorb the low-energy light in the long waveband and emit high-energy light in the low waveband; when the transparent electrode structure is powered on, the molecules of the up-conversion material are re-aligned with the liquid crystal matrix 310, and the arrangement changes from horizontal to vertical. , at this time, the light propagation direction is parallel to the long axis of the liquid crystal matrix 310, but the molecules of the up-conversion material will absorb the low-energy light in the high-band and emit high-energy light in the low-band, thereby improving the reflectivity of the white state, and the The influence of the conversion material molecules on the white state is far greater than the influence on the dark state, thereby significantly improving the CR of normally black total reflection products.

Exemplarily, the up-conversion material can absorb low-energy light with a first wavelength range of 460-540 nm, and emit high-energy light with a second wavelength range of 380-450 nm.

FIG. 8 is a schematic diagram showing the simulated relationship between the voltage applied on the transparent electrode structure and the light reflectivity in the normally black total reflection display product. It can be seen from FIG. 8 that when no voltage is applied to the transparent electrode structure, that is, when the display panel is in a dark state, the reflectivity of the high-energy light in the low-band is relatively high, especially the reflection of the high-energy light in the wavelength range of 380-450 nm. The rate is higher than the reflectivity of low-energy light with a wavelength range of 460-540 nm. If the up-conversion material molecules are doped into the liquid crystal layer, the low-energy light with a wavelength range of 460-540 nm is absorbed and the high-energy light with a wavelength range of 380-450 nm is emitted. , which will increase the reflectivity in the dark state; however, after a voltage is applied to the transparent electrode structure, that is, when the display panel is in the bright state, the reflectivity of the low-energy light in the high-band (460-540 nm) is still lower than that in the low-band (380 nm). ~450nm) high-energy light reflectance, therefore, by doping up-conversion material molecules in the liquid crystal layer, in the bright state, it absorbs low-energy light in high-band and emits high-energy light in low-band. Improve the reflectivity of the bright state, and it can be seen from Figure 8 that in the dark state, although the up-conversion material molecules in the dark state will also convert the low-energy light in the high-band into the high-energy light in the low-band, resulting in the reflection of the dark state However, when the dark state absorbs low-energy light in the high-band and emits high-energy light in the low-band, the effect of increasing the reflectivity is much smaller than that in the bright state when absorbing the low-energy light in the high-band, while the emission Due to the influence of the increase in reflectivity caused by the high-energy light of the low-band, the CR of the normally black total reflection product can still be significantly improved.

In another exemplary embodiment, the functional material molecules may further include down-conversion material molecules, for being in a parallel orientation state parallel to the first substrate when the transparent electrode structure does not form an electric field, and absorbs high-energy light with a third band, and emits low-energy light with a fourth band, wherein the wavelength of the third band is smaller than the wavelength of the fourth band, that is, the down-conversion material molecules can Absorb low-band light and emit high-band light.

Using the above scheme, the functional material molecules 320 can also be down-conversion material molecules. The up-conversion material means that the material is excited by high-energy light and emits low-energy light, that is, it is excited by light with short wavelength and high frequency. , the material emits light with long wavelengths and low frequencies. The molecules of the down-conversion material can have good compatibility with the liquid crystal matrix 310 , have no influence on the performance of the liquid crystal matrix 310 , and can maintain a parallel arrangement with the liquid crystal matrix 310 . When the transparent electrode structure is not powered, when the molecules of the down-conversion material are aligned in parallel with the liquid crystal matrix 310, at this time, when the light propagation direction is perpendicular to the long axis of the liquid crystal matrix 310, the molecules of the down-conversion material play the role of the molecules of the down-conversion material , can absorb the high-energy light in the low-band, and emit low-energy light in the high-band, thereby reducing the reflectivity of the dark state; and, when the transparent electrode structure is powered on, the down-conversion material molecules are regenerated with the liquid crystal matrix 310. The orientation changes from a horizontal arrangement to a vertical arrangement. At this time, the light propagation direction is parallel to the long axis of the liquid crystal matrix 310. Although the down-conversion material molecules will emit low-energy light and reduce the reflectivity of the white state, the down-conversion material will emit light with low energy. The influence of material molecules on the white state is far less than the influence on the dark state, thereby significantly improving the CR of normally black total reflection products.

Exemplarily, the up-conversion material can absorb high-energy light with a third wavelength band of 380-450 nm, and emit low-energy light with a fourth wavelength band of 460-540 nm.

FIG. 8 is a schematic diagram showing the simulated relationship between the voltage applied on the transparent electrode structure and the light reflectivity in the normally black total reflection display product. It can be seen from FIG. 8 that when no voltage is applied to the transparent electrode structure, that is, when the display panel is in a dark state, the reflectivity of the high-energy light in the low-band is relatively high, especially the reflectivity of the high-energy light in the wavelength range of 380-450 nm. When the low-energy light with a wavelength range of 460-540nm is higher than the low-energy light in the wavelength range of 460-540nm, it causes light leakage in the dark state. When the down-conversion material molecules are doped into the liquid crystal layer, the high-energy light in the wavelength band of 380-450nm is absorbed, while the emission band is low-energy light in the range of 460-540nm. light, which will reduce the reflectivity in the dark state; however, after a voltage is applied to the transparent electrode structure, that is, when the display panel is in the bright state, the reflectivity of the low-energy light in the high-band (460-540 nm) is still lower than that in the low-band (380-450nm) high-energy light reflectivity, therefore, by doping down-conversion material molecules in the liquid crystal layer, in the bright state, it absorbs low-band high-energy light and emits high-band low-energy light. It will also reduce the reflectivity of the bright state. However, as can be seen from Figure 8, although the reflectivity will be reduced both in the dark state and in the bright state, the dark state absorbs high-energy light in the low-band and emits low-energy light in the high-band. The effect of reducing the reflectivity caused by energy light is far less than the effect of absorbing low-band high-energy light in the bright state, and the reflectivity reducing effect caused by emitting high-band low-energy light, so it can still be significantly improved. CR of normally black total reflection products.

It should be noted that the display panel provided by the embodiment of the present invention may be a total reflection display panel, and especially can be applied to a normally black type total reflection display product. Compared with a normally white type total reflection display product, it can not only reduce polarized light The chip structure can reduce the cost and ensure the contrast ratio CR.

It should also be noted that the display panel provided by the embodiment of the present invention may also be a transflective liquid crystal display panel.

In an exemplary embodiment, the first substrate 100 is a color filter substrate, and the second substrate 200 is an array substrate; the transparent electrode structure includes: a first transparent electrode and a second transparent electrode; the The first transparent electrode is located on the side of the first substrate 100 facing the second substrate 200, and the second transparent electrode is located on the side of the second substrate 200 facing the first substrate 100; and the display panel further includes : a first alignment layer on the side of the first substrate facing the second substrate, and a second alignment layer on the side of the second substrate facing the first substrate.

The above is only an exemplary structure of the display panel, and in practical applications, the specific structure of the display panel is not limited to this. And the display panel can be various types of display panels such as TN, IPS, VA, etc.

In addition, an embodiment of the present invention also provides a display device, including: the display panel provided by the embodiment of the present invention. Obviously, the display device provided by the embodiment of the present invention can also bring about the beneficial effects brought by the display panel provided by the embodiment of the present invention, which will not be repeated.

In an exemplary embodiment, as shown in FIG. 6 and FIG. 7 , the display device is a normally black liquid crystal display device, further comprising:

a half-wave plate 500 disposed on a side of the first substrate 100 away from the second substrate 200;

The upper polarizer 600 is disposed on the side of the half-wave plate away from the first substrate 100 .

The display device provided in this exemplary embodiment is a normally black type liquid crystal display device. Compared with a normally white type display device, the polarizer structure can be reduced, the cost can be reduced, and the dark state of the normally black type display device in the related art can be improved. Light leakage and low contrast issues.

The following points need to be noted:

(1) The accompanying drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures may refer to general designs.

(2) In the drawings for describing the embodiments of the present disclosure, the thicknesses of layers or regions are exaggerated or reduced for clarity, ie, the drawings are not drawn on actual scale. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element, or Intermediate elements may be present.

(3) The embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments without conflict.

The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims (10)

1. A display panel, characterized in that, comprising: a first substrate and a second substrate arranged on the box; a liquid crystal layer disposed between the first substrate and the second substrate; a reflective film disposed on the side of the second substrate facing the first substrate; A transparent electrode structure located between the first substrate and the second substrate, the transparent electrode structure is used to form an electric field for driving liquid crystal deflection, wherein when the transparent electrode structure does not form an electric field, the display panel is dark When the transparent electrode structure forms an electric field, the display panel is in a bright state; Wherein, the liquid crystal layer includes: a liquid crystal matrix and functional material molecules mixed with the liquid crystal matrix, the functional material molecules have the same orientation as the liquid crystal matrix, and are used to absorb light in a predetermined wavelength band. 2. The display panel according to claim 1, wherein, The liquid crystal layer is a dye liquid crystal layer, and the functional material molecules include dichroic dye molecules. 3. The display panel according to claim 2, wherein, In the dye liquid crystal layer, the weight ratio of the dichroic dye molecules to the liquid crystal matrix is (0.1-5):100. 4. The display panel according to claim 2, wherein, The dichroic dye molecules include black dye molecules, and when the black dye molecules are used for the transparent electrode structure to form an electric field, they are in a vertical orientation state perpendicular to the first substrate, and when the transparent electrode structure is not formed When the electric field is applied, it is in a horizontal orientation state parallel to the first substrate, and absorbs low-wavelength light with a wavelength range of 380-450 nm. 5. The display panel according to claim 1, wherein, The functional material molecules include up-conversion material molecules, which are used to be in a horizontal orientation state parallel to the first substrate when the transparent electrode structure does not form an electric field, and when the transparent electrode structure forms an electric field, the transparent electrode structure forms an electric field. The first substrate is in a vertical vertical orientation state, and absorbs low-energy light with a first waveband, and emits high-energy light with a second waveband, wherein the wavelength of the first waveband is greater than the wavelength of the second waveband; Alternatively, the functional material molecules include down-conversion material molecules, and when the transparent electrode structure forms an electric field, it is in a vertical orientation state perpendicular to the first substrate, and when the transparent electrode structure does not form an electric field, it is in a state of vertical alignment with the first substrate. The first substrate is in a parallel orientation state, absorbs high-energy light with a third wavelength band, and emits low-energy light with a fourth wavelength band, wherein the wavelength of the third wavelength band is smaller than the wavelength of the fourth wavelength band . 6 . The display panel according to claim 1 , wherein the display panel is a total reflection liquid crystal display panel or a transflective liquid crystal display panel. 7 . 7 . The display panel of claim 1 , wherein the first substrate is a color filter substrate, and the second substrate is an array substrate. 8 . 8. The display panel according to claim 1, wherein, The transparent electrode structure includes: a first transparent electrode and a second transparent electrode; the first transparent electrode is located on the side of the first substrate facing the second substrate, and the second transparent electrode is located on the side of the second substrate facing the second substrate one side of the first substrate; and the display panel further includes: a first alignment layer located on the side of the first substrate facing the second substrate, and a first alignment layer located on the side of the second substrate facing the first substrate side of the second alignment layer. 9. A display device, comprising: the display panel according to any one of claims 1 to 8. 10. The display device according to claim 9, wherein, The display device is a normally black liquid crystal display device, further comprising: a half-wave plate disposed on a side of the first substrate away from the second substrate; an upper polarizer disposed on a side of the half-wave plate away from the first substrate.

Images