Patent Description:
The present disclosure relates to the technical field of liquid crystal display, and more specifically, to a liquid crystal display panel and a smart terminal provided with the same.

According to a first aspect of the present disclosure, there is provided a liquid crystal display panel, including: a first transparent glass layer; a second transparent glass layer overlapping the first transparent glass layer; two or more pixel units of a color filter layer, disposed on a side of the first transparent glass layer that is opposite to the second transparent glass layer, each of the pixel units including a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel arranged in accordance with a predetermined rule; a black matrix disposed between the pixel units to isolate two pixel units adjacent to each other; and a fingerprint sensor disposed on the second transparent glass layer, and being covered by the black matrix; when the fingerprint sensor is viewed from the top, an area of the fingerprint sensor corresponding to a width or length of the red sub-pixel is larger than any one of an area of the fingerprint sensor corresponding to a width or length of the green sub-pixel, an area of the fingerprint sensor corresponding to a width or length of the blue sub-pixel, and an area of the fingerprint sensor corresponding to a region of the white sub-pixel within a plane parallel to the first transparent glass layer.

Preferably, in the liquid crystal display panel the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel are stacked along a first direction within the same pixel unit.

Preferably, a first direction is a direction pointing outwardly from the black matrix to the pixel unit or a direction pointing inwardly from the pixel unit to the black matrix within a plane parallel to the first transparent glass layer; the red sub-pixel is adjacent to the black matrix.

Preferably, in the liquid crystal display panel the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel are arranged in parallel along a second direction within the same pixel unit.

Preferably, the second direction is perpendicular to the first direction, and a plane formed by intersection of the second direction with the first direction is parallel to a plane where the first transparent glass layer is located.

Preferably, in the liquid crystal display panel the red sub-pixel is arranged next to the black matrix.

Preferably, in the liquid crystal display panel at least one of the green sub-pixel, the blue sub-pixel, and the white sub-pixel is arranged in parallel with the red sub-pixel.

Preferably, in the liquid crystal display panel the blue sub-pixel is stacked on any one of the red sub-pixel and the green sub-pixel; the white sub-pixel is stacked on any one of the red sub-pixel and the green sub-pixel.

Preferably, in the liquid crystal display panel the fingerprint sensor has a first width and a second width smaller than the first width and/or when the fingerprint sensor is viewed from the top, the first width corresponds to a width of the red sub-pixel.

Preferably, in the liquid crystal display a width of the red sub-pixel is greater than a width of any one of the green sub-pixel, the blue sub-pixel, and the white sub-pixel in the second direction within the same pixel unit.

Preferably, in the liquid crystal display panel the fingerprint sensor includes a photodiode made of an amorphous silicon material.

According to a second aspect of the present disclosure, there is provided a smart terminal, including the liquid crystal display panel according to the fist aspect and the respective embodiments as described above.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure, as claimed.

The accompanying drawings, which are incorporated in and constitute a part of this description, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

Description will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings.

The principle of various embodiments of the present disclosure will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are given only to enable those skilled in the art to better understand and thereby implement the present disclosure, not to limit the scope of the present disclosure in any way.

It should be noted that although the expressions such as "first" and "second" are used herein to describe the different modules, steps, data, etc. of the embodiments of the present disclosure, the expressions such as "first" and "second" are only for the purpose of distinguishing between different modules, steps, data, etc., and do not indicate a specific order or priority. In fact, the expressions such as "first" and "second" can be used interchangeably.

In order to better understand the liquid crystal display panel according to the present disclosure, preferred embodiments of the liquid crystal display panel of the present disclosure will be further described below with reference to the accompanying drawings. The orientation or positional relationship indicated by the terms "center," "longitudinal," "horizontal," "front," "rear," "left," "right," "vertical," "top," "bottom," "inner," "outer," etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments and simplifying the description, it does not indicate or imply that the device or element referred to must have a specific orientation, must be constructed and operated with a specific orientation, so it cannot be understood as a limitation to the protection scope of the embodiments, and the same reference numerals indicate the same type of structure.

In order to improve use security of smart terminal devices, Liquid Crystal Displays (LCD) may adopt an unlocking way of front scratching or pressing, or the smart terminal devices adopt a back-unlocking manner to achieve functions such as secure fingerprint unlocking, secure application unlocking, etc. For smart terminal devices, the display effect of fingerprint unlocking may be set on the LCD.

The advent of the full-screen era has led to the current flourishing of in-display fingerprint technology. However, due to cost and display issues, at present, the optical fingerprint module is integrated only in the high-end models of OLED screens. Due to the backlight problem for the in-display screen of LCD, which cannot be overcome by the current technique, LCD screen manufacturers are concerned about how to increase the value of LCD screen. Therefore, many LCD screen manufacturers have begun to invest a lot of manpower and money for development, the methods adopted by them are to use the photosensitive fingerprint sensor to acquire fingerprint images.

At present, the in-display fingerprint acquisition of the LCD screen proposed by the LCD display manufacturers may have the following common problems: <NUM>. the optical path scheme affects the display effect; <NUM>. the production complexity is increased; <NUM>. the sensitivity of the photosensitive device is insufficient, the area requirement is large, and the aperture ratio is affected indirectly, the aperture ratio is the one that most affects the displaying, which will greatly reduce the display effect.

<FIG> is a schematic side view of a structure of a liquid crystal display panel according to some embodiments. In <FIG>, numeral reference <NUM> represents a first transparent glass layer; numeral reference <NUM> represents a second transparent glass layer; numeral reference <NUM> represents a pixel unit of a color filter (CF) layer; numeral reference <NUM> represents a black matrix (BM); numeral reference <NUM> represents a fingerprint sensor; numeral reference <NUM> represents a thin-film transistor (TFT); numeral reference <NUM> represents a light-shielding layer; numeral reference <NUM> represents a liquid crystal molecule; numeral reference <NUM> represents a backlight plate; numeral reference <NUM> represents an incident light; and numeral reference <NUM> represents a light outgoing angle.

<FIG> illustrates a light path implementation scheme according to some embodiments. The backlight plate <NUM> emits light, after the light passes through the second transparent glass layer <NUM> and the liquid crystal molecule <NUM>, it is color-filtered by the pixel unit <NUM> and irradiates onto the first transparent glass layer <NUM>. The fingerprint is affixed to an upper surface of the first transparent glass layer <NUM>, the light emitted from the backlight plate <NUM> illuminates the fingerprint. After the fingerprint is illuminated, the brightness at the ridge of the fingerprint is slightly greater than that at the valley of the fingerprint.

The light emitted from the backlight plate <NUM> forms an incident light <NUM> at the fingerprint which is at criticality on the upper surface of the first transparent glass layer <NUM>. The incident light <NUM> is incident on the fingerprint sensor <NUM>. Due to the reduced energy of the light emitted by the backlight plate <NUM> after being filtered by the pixel unit <NUM> and the sensitivity factor of the fingerprint sensor <NUM>, the difference between the ridge and the valley of the fingerprint identified by the fingerprint sensor <NUM> is not obvious. The difference between the incident light <NUM> at the ridge and the incident light <NUM> at the valley identified by the fingerprint sensor <NUM> is relatively small, it is prone to cause light mixing, which renders the fingerprint identified by the fingerprint sensor <NUM> unclear. Herein, the light mixing is determined based on the brightness of the fingerprint and the sensitivity of the fingerprint sensor <NUM>, and the fingerprint lines recognized by the fingerprint sensor <NUM> are blurred when the energy difference between the photon energy reflected from the fingerprint ridge to the fingerprint sensor <NUM> and the photon energy emitted from the fingerprint valley to the fingerprint sensor <NUM> is relatively small.

The backlight plate <NUM> can be improved, the direction of the light emitted by the backlight plate <NUM> is restricted by the light outgoing angle <NUM>, so that the light emitted by the backlight plate <NUM> can be more concentrated on the fingerprint, thereby increasing the brightness of the fingerprint, and making the difference between the ridge and the valley of the fingerprint more obvious, then the fingerprint sensor <NUM> can recognize a clearer fingerprint image. In addition to using the light outgoing angle <NUM> to limit so as to solve the light mixing problem, a collimated light path will also be created in the middle of the black matrix <NUM> for the incident light <NUM> reflected from the finger to further reduce the light mixing problem.

As shown in <FIG> is a schematic top view of the structure in <FIG>. In <FIG>, <NUM> is a red sub-pixel; <NUM> is a green sub-pixel; <NUM> is a blue sub-pixel; due to the sensitivity factor of the fingerprint sensor <NUM> and the requirement for light shielding, the black matrix <NUM> needs to be enlarged to cover the entire fingerprint sensor <NUM>.

In addition, the pixel unit <NUM> also has a problem of stray light. When the light emitted by the backlight plate <NUM> passes through the pixel unit <NUM>, a part of the light is reflected to the photosensitive sensor <NUM>, and the light reflected by the first transparent glass plate <NUM> back to the pixel unit <NUM> is incident on the photosensitive sensor <NUM> through the pixel unit <NUM>, forming the stray light. In order to avoid disturbing the fingerprint sensor <NUM>, the black matrix <NUM> needs to be expanded further, the aperture ratio of the pixel unit <NUM> is also occupied to a certain extent. There is no solution in the related art that can achieve a more optimized design in aperture ratio, brightness, and sensor size.

A first aspect of the embodiments of the present disclosure provides a liquid crystal display panel, which can make improvement to the problem of affecting the LCD display by setting the in-display fingerprint sensor for the LCD screen.

<FIG> is a schematic side view of a structure of a liquid crystal display panel according to an exemplary embodiment. <FIG> is a schematic top view of a structure of a liquid crystal display panel according to the embodiment shown in <FIG>.

As shown in <FIG>, the liquid crystal display panel of this embodiment includes a first transparent glass layer <NUM>, a second transparent glass layer <NUM>, two or more pixel units <NUM>, a black matrix <NUM>, and a fingerprint sensor <NUM>.

Herein, the second transparent glass layer <NUM> overlaps the first transparent glass layer <NUM>.

The two or more pixel units <NUM> are disposed on a side of the first transparent glass layer <NUM> opposite to the second transparent glass layer <NUM>. The pixel unit <NUM> includes a red sub-pixel <NUM>, a green sub-pixel <NUM>, a blue sub-pixel <NUM>, and a white sub-pixel <NUM> arranged according to a predetermined rule.

The black matrix <NUM> is disposed between two adjacent pixel units <NUM> to isolate two pixel units <NUM> adjacent to each other.

The fingerprint sensor <NUM> is disposed on the second transparent glass layer <NUM>, and the black matrix <NUM> covers the fingerprint sensor <NUM>. When the fingerprint sensor <NUM> is viewed from the top, an area of the fingerprint sensor <NUM> corresponding to a region of the red sub-pixel <NUM> is larger than any one of an area of the fingerprint sensor corresponding to a region of the green sub-pixel <NUM>, an area of the fingerprint sensor corresponding to a region of the blue sub-pixel <NUM>, and an area of the fingerprint sensor corresponding to a region of the white sub-pixel <NUM>. That is to say, the area of the fingerprint sensor <NUM> corresponding to the region of the red sub-pixel <NUM> is larger than the area of the fingerprint sensor <NUM> corresponding to the region of the green sub-pixel <NUM>. The area of the fingerprint sensor <NUM> corresponding to the region of the red sub-pixel <NUM> is larger than the area of the fingerprint sensor <NUM> corresponding to the region of the blue sub-pixel <NUM>. The area of the fingerprint sensor <NUM> corresponding to the region of the red sub-pixel <NUM> is larger than an area of the fingerprint sensor <NUM> corresponding to the region of the white sub-pixel <NUM>.

In this embodiment, the direction in which the fingerprint sensor <NUM> is viewed from the top is a direction from the first transparent glass layer <NUM> to the second transparent glass layer <NUM>, that is, the direction perpendicular to the first transparent glass layer <NUM>.

In this embodiment, as shown in <FIG>, the region corresponding to the red sub-pixel <NUM> refers to: the region <NUM> corresponding to the width of the red sub-pixel <NUM> in the fingerprint sensor <NUM>, when the fingerprint sensor <NUM> is viewed from the top. The region corresponding to the green sub-pixel <NUM> refers to: the region <NUM> corresponding to the width of the green sub-pixel <NUM> in the fingerprint sensor <NUM>. The region corresponding to the blue sub-pixel <NUM> refers to: the region <NUM> corresponding to the width of the blue sub-pixel <NUM> in the fingerprint sensor <NUM>. The region corresponding to the white sub-pixel <NUM> refers to: the region <NUM> corresponding to the width of the white sub-pixel <NUM> in the fingerprint sensor <NUM>.

The fingerprint sensor <NUM> may be disposed on the second transparent glass layer <NUM> below the black matrix <NUM>, and the fingerprint sensor <NUM> can receive the incident light. The magnitude of the area of the fingerprint sensor <NUM> can be set according to its required sensitivity. The larger the area of the fingerprint sensor <NUM> is, the better the sensitivity is. However, if the area of the fingerprint sensor <NUM> is too large, it will affect the display effect of the display panel.

In order to achieve good shading and avoid color mixing, the black matrix <NUM> covers the entire fingerprint sensor <NUM>. In addition, the light passing through the pixel unit <NUM> also generates stray light and interferes with the fingerprint sensor <NUM>. Therefore, the black matrix <NUM> is further expanded outwardly to avoid stray light from affecting the fingerprint sensor <NUM>. However, as the set area of the black matrix <NUM> increases, the aperture ratio of the LCD is affected to a certain extent, which in turn affects the display brightness of the LCD.

In the liquid crystal display panel of this embodiment, the white sub-pixel <NUM> is provided in the pixel unit <NUM>. By providing the white sub-pixel <NUM> in the pixel unit <NUM>, the light transmittance of the LCD can be increased, and the aperture ratio of the LCD can be raised, thereby improving the display brightness of the LCD.

The fingerprint sensor <NUM> of this embodiment is installed on a side of the second transparent glass layer <NUM> facing the first transparent glass layer <NUM>. When viewed from the first transparent glass layer <NUM> toward the second transparent glass layer <NUM>, the fingerprint sensor <NUM> is set in a way that the area of the fingerprint sensor <NUM> corresponding to the region <NUM> of the red sub-pixel is larger than the area of the fingerprint sensor <NUM> corresponding to the region <NUM> of the green sub-pixel <NUM>. The fingerprint sensor <NUM> is set in a way that the area of the fingerprint sensor <NUM> corresponding to the region <NUM> of the red sub-pixel is larger than the area of the fingerprint sensor <NUM> corresponding to the region <NUM> of the blue sub-pixel <NUM>. The fingerprint sensor <NUM> is set in a way that the area of the fingerprint sensor <NUM> corresponding to the region <NUM> of the red sub-pixel is larger than the area of the fingerprint sensor <NUM> corresponding to the region <NUM> of the white sub-pixel <NUM>. That is, the area of the fingerprint sensor <NUM> corresponding to the region <NUM> of the red sub-pixel is larger than any one of the area of the fingerprint sensor <NUM> corresponding to the region <NUM> of the green sub-pixel <NUM>, the area of the fingerprint sensor <NUM> corresponding to the region <NUM> of the blue sub-pixel <NUM>, and the area of the fingerprint sensor <NUM> corresponding to the region <NUM> of the white sub-pixel <NUM>. The above-mentioned design manner for the fingerprint sensor <NUM> can increase the entire area of the fingerprint sensor <NUM>, enable the fingerprint sensor <NUM> to accumulate more photons in a continuous period of time, and help the fingerprint sensor <NUM> to acquire the clearer and more complete fingerprint image, thereby the sensitivity of the fingerprint sensor is improved.

The red light has less interference with the fingerprint sensor <NUM>. In order to avoid the influence of stray light on the fingerprint sensor <NUM> and increase the area of the fingerprint sensor <NUM>, the fingerprint sensor <NUM> is set in a way that the area of the region <NUM> corresponding to the red sub-pixel <NUM> is larger than any of the area of the fingerprint sensor <NUM> corresponding to the green sub-pixel <NUM>, the area of the fingerprint sensor <NUM> corresponding to the blue sub-pixel <NUM>, and the area of the fingerprint sensor <NUM> corresponding to the white sub-pixel <NUM>.

In the above-described liquid crystal display panel provided in this embodiment, the white sub-pixel <NUM> is provided in the pixel unit <NUM>. By providing the white sub-pixels <NUM> in the pixel unit <NUM>, the light transmittance of the LCD can be increased, the aperture ratio of the LCD can be raised, and thus the display brightness of the LCD can be improved. By increasing the area of the fingerprint sensor <NUM> corresponding to the region of the red sub-pixel <NUM>, the overall area of the fingerprint sensor <NUM> is increased, the maximum value of the photon capacity that can be accumulated by the fingerprint sensor <NUM> is improved, and the fingerprint image acquired by the fingerprint sensor <NUM> can be improved in terms of definition, accuracy, and sensitivity.

In some embodiments, the sub-pixels in the pixel unit <NUM> can be laid out so that when the liquid crystal display panel is viewed from the top, the red sub-pixels <NUM> is close to the fingerprint sensor <NUM>. Herein, referring to the fingerprint sensor <NUM> of <FIG>, the width of the fingerprint sensor <NUM> can be increased, and thickness of the fingerprint sensor <NUM> can also be increased, within an allowable distance between the first transparent glass layer <NUM> and the second transparent glass layer <NUM>. The layout of the sub-pixels in the pixel unit <NUM> is exemplarily described below with reference to <FIG>, to increase the area of the fingerprint sensor <NUM> and improve the sensitivity of the liquid crystal display panel. Herein, each of the pixel sub-units in <FIG> is an orthographic projection imaging of the pixel unit <NUM> on the second transparent glass layer <NUM>, and is used to present the horizontal position relationship between the fingerprint sensor <NUM> and the pixel unit <NUM> in the liquid crystal display panel shown in <FIG>. A layer of pixel sub-units is arranged in each pixel unit <NUM>, and the aforesaid pixel sub-units are arranged on the same layer.

In the following embodiments, the first direction and the second direction are perpendicular to each other, and a plane formed by intersection of the first direction and the second direction is parallel to the plane where the first transparent glass layer <NUM> and the first transparent glass layer <NUM> are located in <FIG>.

Herein, the first direction can be a direction pointing outwardly from the black matrix to the pixel unit or pointing inwardly from the pixel unit to the black matrix within a plane parallel to the first transparent glass layer; that is, the direction perpendicular to the vertical frame of the black matrix <NUM> in <FIG>, just as indicated by the hollow arrow in <FIG>. That is, it is the direction from the black matrix <NUM> on the left in <FIG> toward the pixel unit <NUM> on the left, or the direction from the black matrix <NUM> on the right in <FIG> toward the pixel unit <NUM> on the right.

The second direction can be a direction perpendicular to a side surface of the liquid crystal display panel shown in <FIG>, such as the direction of the black solid dot in <FIG>, this black solid dot points to the inside or outside of the interface shown in <FIG>. That is, it can be the direction perpendicular to the interface shown in <FIG> and toward the inside of the interface, or the direction perpendicular to the interface shown in <FIG> and toward the outside of the interface.

Referring to <FIG>, in some embodiments, within the same pixel unit <NUM>, along the first direction, the red sub-pixel <NUM>, the green sub-pixel <NUM>, the blue sub-pixel <NUM>, and the white sub-pixels <NUM> are stacked; the first direction is a direction pointing outwardly from the black matrix <NUM> to the pixel unit <NUM>, or a direction pointing inwardly from the pixel unit <NUM> to the black matrix <NUM> within a plane parallel to the first transparent glass layer; and the red sub-pixel <NUM> is adjacent to the black matrix <NUM>.

There is no restriction on the stacking order of the red sub-pixel <NUM>, the green sub-pixel <NUM>, the blue sub-pixel <NUM>, and the white sub-pixel <NUM>, as long as it is satisfied that the red sub-pixel <NUM> is adjacent to the black matrix <NUM>, the stacking order of the remaining sub-pixels can be arbitrarily set.

<FIG> is a schematic top view of a structure of another liquid crystal display panel according to the embodiment shown in <FIG>. As shown in <FIG>, in some embodiments, within the same pixel unit <NUM>, the red sub-pixel <NUM>, the green sub-pixel <NUM>, the blue sub-pixel <NUM>, and the white sub-pixels <NUM> are arranged in parallel along a second direction; the second direction is perpendicular to the first direction, and a plane formed by intersection of the second direction with the first direction is parallel to a plane where the first transparent glass layer <NUM> is located in <FIG>; the first direction is a direction pointing outwardly from the black matrix <NUM> to the pixel unit <NUM>, or a direction pointing inwardly from the pixel unit <NUM> to the black matrix <NUM> within a plane parallel to the first transparent glass layer.

In the embodiment shown in the above <FIG>, the fingerprint sensor <NUM> can be divided into a region <NUM> corresponding to the red sub-pixel <NUM>, a region <NUM> corresponding to the green sub-pixel <NUM>, a region <NUM> corresponding to the blue sub-pixel <NUM>, and a region <NUM> corresponding to the white sub-pixel <NUM>. As shown in <FIG>, the area of the region <NUM> corresponding to the red sub-pixel <NUM> is larger than the area of the region <NUM> corresponding to the green sub-pixel <NUM>. As shown in <FIG>, the width of the region <NUM> corresponding to the red sub-pixel <NUM> and the width corresponding to the green sub-pixel <NUM> can be the same. However, the region <NUM> corresponding to the red sub-pixel <NUM> is closer to the red sub-pixel <NUM>, when compared to any one of the region <NUM> corresponding to the green sub-pixel <NUM>, the region <NUM> corresponding to the blue sub-pixel <NUM>, and the region <NUM> corresponding to the white sub-pixel <NUM>. That is, the length of the region <NUM> corresponding to the red sub-pixel <NUM> is larger than the length of the region <NUM> corresponding to the green sub-pixel <NUM>, the length of the region <NUM> corresponding to the blue sub-pixel <NUM>, and the length of the region <NUM> corresponding to the white sub-pixel <NUM>. Therefore, the area of the region <NUM> corresponding to the red sub-pixel <NUM> is larger than the area of the region <NUM> corresponding to the green sub-pixel <NUM>. The area of the region <NUM> corresponding to the red sub-pixel <NUM> is larger than the area of the region <NUM> corresponding to the blue sub-pixel <NUM>. The area of the region <NUM> corresponding to the red sub-pixel <NUM> is larger than the area of the region <NUM> corresponding to the white sub-pixel <NUM>.

However, the present disclosure is not limited thereto, the width of the region <NUM> corresponding to the red sub-pixel <NUM> can be made to be larger than the width of the region <NUM> corresponding to the green sub-pixel <NUM>, thereby realizing that the area of the region <NUM> corresponding to the red sub-pixel <NUM> is larger than the area of the region <NUM> corresponding to the green sub-pixel <NUM>. Similarly, the width of the region <NUM> corresponding to the red sub-pixel <NUM> can be made to be larger than the width of the region <NUM> corresponding to the blue sub-pixel <NUM>, or larger than the width of the region <NUM> corresponding to the white sub-pixel <NUM>. As a result, the area of the fingerprint sensor <NUM> near to the red sub-pixel <NUM> is increased.

<FIG> is a schematic top view of a structure of still another liquid crystal display panel according to the embodiment shown in <FIG>. As shown in <FIG>, in some other embodiments, the red sub-pixel <NUM>, the green sub-pixel <NUM>, the blue sub-pixel <NUM>, and the white sub-pixels <NUM> are arranged in parallel along a second direction within the same pixel unit <NUM>, and the red sub-pixel <NUM> is disposed next to the black matrix <NUM>; the second direction is perpendicular to the first direction, and a plane formed by intersection of the second direction with the first direction is parallel to the plane on which the transparent glass layer <NUM> is located in <FIG>; the first direction is a direction pointing outwardly from the black matrix <NUM> to the pixel unit <NUM> or a direction points inwardly from the pixel unit <NUM> to the black matrix <NUM> within a plane parallel to the first transparent glass layer <NUM>.

In still other embodiments, in a second direction within the same pixel unit <NUM>, the red sub-pixel <NUM> is disposed next to the black matrix <NUM>, and at least one of the green sub-pixel <NUM>, the blue sub-pixel <NUM>, and the white sub-pixel <NUM> is arranged in parallel with the red sub-pixel <NUM>; the second direction is perpendicular to the first direction, and a plane formed by intersection of the second direction with the first direction is parallel to the plane on which the transparent glass layer <NUM> is located in <FIG>; the first direction is a direction pointing outwardly from the black matrix <NUM> to the pixel unit <NUM>, or a direction pointing inwardly from the pixel unit <NUM> to the black matrix <NUM> within a plane parallel to the first transparent glass layer <NUM>.

In still other embodiments, in a second direction within the same pixel unit <NUM>, the red sub-pixel <NUM> and the green sub-pixel <NUM> are arranged in parallel; the second direction is perpendicular to the first direction, and a plane formed by intersection of the second direction with the first direction is parallel to the plane on which the transparent glass layer <NUM> is located in <FIG>; the first direction is a direction pointing outwardly from the black matrix <NUM> to the pixel unit <NUM> or pointing inwardly from the pixel unit <NUM> to the black matrix <NUM> within a plane parallel to the first transparent glass layer <NUM>; the blue sub-pixel <NUM> is stacked on any one of the red sub-pixel <NUM> and the green sub-pixel <NUM>; and the white sub-pixel <NUM> is stacked on any one of the red sub-pixel <NUM> and the green sub-pixel <NUM>.

<FIG> is a schematic top view of a structure of yet another liquid crystal display panel according to the embodiment shown in <FIG>. As shown in <FIG>, in some embodiments, the red sub-pixel <NUM>, the green sub-pixel <NUM>, the blue sub-pixel <NUM>, and the white sub-pixel <NUM> are arranged in parallel along a second direction within the same pixel unit <NUM>; the second direction is perpendicular to the first direction, and a plane formed by intersection of the second direction with the first direction is parallel to the plane on which the transparent glass layer <NUM> is located in <FIG>; the first direction is a direction pointing outwardly from the black matrix <NUM> to the pixel unit <NUM> or pointing inwardly from the pixel unit <NUM> to the black matrix <NUM> within a plane parallel to the first transparent glass layer <NUM>; the fingerprint sensor <NUM> has a first width and a second width smaller than the first width; and when the fingerprint sensor <NUM> is viewed from the top, the first width corresponds to the red sub-pixel <NUM>.

In some other embodiments, in the second direction within the same pixel unit <NUM>, the width of the red sub-pixel <NUM> is larger than the width of any one of the green sub-pixel <NUM>, the blue sub-pixel <NUM>, and the white sub-pixel <NUM>. The second direction is perpendicular to the first direction, and a plane formed by intersection of the second direction with the first direction is parallel to the plane on which the transparent glass layer <NUM> is located in <FIG>; the first direction is a direction pointing outwardly from the black matrix <NUM> to the pixel unit <NUM> or pointing inwardly from the pixel unit <NUM> to the black matrix <NUM> within a plane parallel to the first transparent glass layer <NUM>.

The layout of the red sub-pixel <NUM>, the green sub-pixel <NUM>, the blue sub-pixel <NUM>, and the white sub-pixel <NUM> in the pixel unit <NUM> in the above manner can increase the area of the fingerprint sensor <NUM>, and the fingerprint sensor <NUM> with increased area is less affected by stray light. The definition and accuracy of the fingerprint image acquired by the fingerprint sensor <NUM> is increased, thereby the sensitivity of the liquid crystal display panel is improved.

In some embodiments, the fingerprint sensor <NUM> includes a photodiode made of an amorphous silicon material. <FIG> is a graph of an external quantum efficiency of a photodiode made of an amorphous silicon material. The photodiode in this embodiment can be a PIN diode. According to the data obtained from the external quantum efficiency (EQE) test on the fingerprint sensor <NUM> made of the above material, it can be known that the response of the fingerprint sensor <NUM> to red light (> <NUM>) is less sensitive, and thus this characteristic can be used to increase the effective area of the fingerprint sensor <NUM> by placing it in an area where the red light has a larger influence. The use of the fingerprint sensor <NUM> made of an amorphous silicon material can effectively improve the influence of the light transmitted by the red sub-pixel <NUM> on the fingerprint sensor <NUM>. The area of the fingerprint sensor <NUM> corresponding to the region of the red sub-pixel <NUM> of the fingerprint sensor <NUM> is made larger than the area of any of the region corresponding to the green sub-pixel <NUM>, the region corresponding to the blue sub-pixel <NUM>, and the region corresponding to the white sub-pixel <NUM>, which can increase the design area of the fingerprint sensor <NUM> and further improve the fingerprint performance of the liquid crystal display panel.

The red sub-pixel <NUM>, the green sub-pixel <NUM>, the blue sub-pixel <NUM>, and the white sub-pixel <NUM> in the pixel unit are laid out according to the above embodiments, through which, the area of the region of the fingerprint sensor <NUM> corresponding to the red sub-pixel <NUM> is increased, which enables a coordinated and optimized design of the aperture ratio, brightness of the liquid crystal display panel and the area of the fingerprint sensor <NUM>, and effectively improves the fingerprint performance of the liquid crystal display panel.

According to another aspect of the embodiments of the present disclosure, a smart terminal is provided, the smart terminal is provided with the liquid crystal display panel provided in the first aspect and in each embodiment described above. The display brightness, aperture ratio, and area of the fingerprint sensor <NUM> of the smart terminal can be effectively improved by providing the above liquid crystal display panel such that the fingerprint performance of the smart terminal can be optimized.

Various embodiments of the present disclosure can include one or more of the following advantages. The display brightness and aperture ratio of the liquid crystal display panel can be improved by adding the white sub-pixel to the pixel unit. By increasing the area of the fingerprint sensor corresponding to the sub-pixel that is not sensitive, the area of the overall fingerprint sensor can be increased, the area of the fingerprint sensor can be increased, and thus the sensitivity of the fingerprint sensor of the liquid crystal display panel is improved.

It should be understood that "a plurality" or "multiple" as referred to herein means two or more. "And/or," describing the association relationship of the associated objects, indicates that there may be three relationships, for example, A and/or B may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately. The character "/" generally indicates that the contextual objects are in an "or" relationship.

In the present disclosure, a first element being "on" a second element may indicate direct contact between the first and second elements, without contact, or indirect geometrical relationship through one or more intermediate media or layers, unless otherwise explicitly stated and defined. Similarly, a first element being "under," "underneath" or "beneath" a second element may indicate direct contact between the first and second elements, without contact, or indirect geometrical relationship through one or more intermediate media or layers, unless otherwise explicitly stated and defined.

Claim 1:
A liquid crystal display panel, characterized in that it comprises:
a first transparent glass layer (<NUM>);
a second transparent glass layer (<NUM>) overlapping the first transparent glass layer (<NUM>);
two or more pixel units (<NUM>) of a color filter layer, disposed on a side of the first transparent glass layer (<NUM>) opposing the second transparent glass layer (<NUM>), each of the pixel units (<NUM>) including a red sub-pixel (<NUM>), a green sub-pixel (<NUM>), a blue sub-pixel (<NUM>), and a white sub-pixel (<NUM>) arranged in accordance with a predetermined rule;
a black matrix (<NUM>) disposed between the pixel units (<NUM>) to isolate two pixel units adjacent to each other; and
a fingerprint sensor (<NUM>) disposed on the second transparent glass layer (<NUM>), and covered by the black matrix (<NUM>);
wherein when the fingerprint sensor (<NUM>) is viewed from the top, an area of the fingerprint sensor (<NUM>) corresponding to a width or length of the red sub-pixel (<NUM>) is larger than any one of an area of the fingerprint sensor (<NUM>) corresponding to a width or length of the green sub-pixel (<NUM>), an area of the fingerprint sensor (<NUM>) corresponding to a width or length of the blue sub-pixel (<NUM>), and an area of the fingerprint sensor (<NUM>) corresponding to a width or length of the white sub-pixel (<NUM>) within a plane parallel to the first transparent glass layer (<NUM>).