CN210428007U

CN210428007U - TN type LCD display screen

Info

Publication number: CN210428007U
Application number: CN201921380428.8U
Authority: CN
Inventors: 徐志栋
Original assignee: Suzhou Nine Chun Electronic Technology Ltd
Current assignee: Suzhou Nine Chun Electronic Technology Ltd
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2020-04-28
Anticipated expiration: 2029-08-23

Abstract

The utility model discloses a TN type LCD display screen, including the face glass substrate, with face glass substrate parallel arrangement's end glass substrate, be used for connecting the face glass substrate with the frame of end glass substrate is glued, is set up the face glass substrate with liquid crystal layer, setting between the end glass substrate are in keeping away from of face glass substrate the transmission type polaroid, the setting of one side of liquid crystal layer are in keeping away from of end glass substrate the reflection-type polaroid, the setting of one side of liquid crystal layer are in keeping away from of lower polaroid the backlight board of one side of end glass substrate and being used for the drive circuit that the backlight board was opened and was closed, wherein, the distortion angle of liquid crystal layer is between 80 ~ 110. The scheme can enable the TN type LCD display screen to be switched between positive display and negative display at will, and compatibility of the display screen is improved.

Description

TN type LCD display screen

Technical Field

The utility model relates to a display screen technical field, specific is a TN type LCD display screen.

Background

LCD (Liquid Crystal Display) has the advantages of low driving voltage, low power consumption, high reliability, large amount of Display information, no flicker, no harm to human body, automatic production process, low cost, etc., and is an ideal Display device and widely used in various instruments and meters nowadays. In the LCD, the electro-optical effect of the liquid crystal is mainly used to convert the electric signal into a visible signal such as a character and an image. The liquid crystal is normally ordered in molecular arrangement and appears clear and transparent, and once a direct current electric field is applied, the molecular arrangement is disturbed, a part of the liquid crystal becomes opaque, the color of the liquid crystal is deepened, and thus, numbers and images can be displayed. LCDs are classified into various kinds according to their structural arrangement, and TN (Twisted Nematic) type LCDs are one of the most commonly used LCDs at present.

The existing TN type LCD display screen is characterized in that in a single display screen, positive display (namely white (natural color of the liquid crystal screen) bottom and black number and letter display, namely light color background dark characters, the contrast ratio is higher, and the display screen is clear under normal conditions) or negative display (black bottom and white number and letter display, namely dark color background light color characters, generally a backlight source is added to achieve the display effect, the display screen is clear under sunlight and outdoor conditions and is mainly used for electronic book software), and few TN display screens compatible with the positive display and the negative display are available.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the embodiment of the utility model provides a TN type LCD display screen, it is used for solving above-mentioned technical problem.

The embodiment of the application discloses: a TN type LCD display screen comprises a surface glass substrate, a bottom glass substrate arranged in parallel with the surface glass substrate, frame glue used for connecting the surface glass substrate and the bottom glass substrate, a liquid crystal layer arranged between the surface glass substrate and the bottom glass substrate, a transmission type polaroid arranged on one side of the surface glass substrate far away from the liquid crystal layer, a reflection type polaroid arranged on one side of the bottom glass substrate far away from the liquid crystal layer, a backlight plate arranged on one side of the lower polaroid far away from the bottom glass substrate, and a driving circuit used for driving the backlight plate to be opened and closed, wherein the twist angle of the liquid crystal layer is between 80 degrees and 110 degrees.

Specifically, the value of delta nd of the liquid crystal layer is between 0.49 and 0.53.

Specifically, an included angle between a transmission axis of the transmission type polarizer and an angular bisector of a twist angle of the liquid crystal layer is 45 °.

Specifically, the reflection type polarizer is an RDF-B polarizer.

Specifically, the reflection axis of the reflection type polarizer is perpendicular to the transmission axis of the transmission type polarizer.

The utility model has the advantages as follows: according to the LCD screen, the transmission type polaroid is arranged on one side, far away from the liquid crystal layer, of the surface glass substrate, the reflection type polaroid is arranged on one side, far away from the liquid crystal layer, of the bottom glass substrate, the white backlight plate is arranged on one side, far away from the bottom glass substrate, of the reflection type polaroid, the driving circuit used for driving the backlight plate to be opened and closed is further arranged, the LCD screen can be switched between positive display and negative display at will, and the compatibility of the LCD screen is improved.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a TN mode LCD display screen according to an embodiment of the present invention.

Reference numerals of the above figures: the liquid crystal display panel comprises a 1-surface glass substrate, a 2-bottom glass substrate, 3-frame glue, a 4-liquid crystal layer, a 5-transmission type polarizer, a 6-reflection type polarizer and a 7-backlight plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the TN LCD panel includes a front glass substrate 1, a bottom glass substrate 2, a sealant 3, a liquid crystal layer 4, a transmissive polarizer 5, a reflective polarizer 6, a backlight 7, and a driving circuit (not shown) for driving the backlight 7 to be turned on and off. The surface glass substrate 1 and the bottom glass substrate 2 are arranged in parallel, and the frame glue 3 is arranged between the surface glass substrate 1 and the bottom glass substrate 2 to connect the two, so that a space for placing the liquid crystal layer 4 is formed between the surface glass substrate 1 and the bottom glass substrate 2. The transmission type polarizer 5 is disposed on the side of the face glass substrate 1 away from the liquid crystal layer 4, the reflection type polarizer 6 is disposed on the side of the ground glass substrate 2 away from the liquid crystal layer 4, and the backlight plate 7 is disposed on the side of the reflection type polarizer 6 away from the bottom glass substrate 2. The driving circuit is used for controlling the backlight plate 7 to be switched on and off, so that the LCD display screen is switched between positive display and negative display. The twist angle of the liquid crystal layer 4 is between 80 and 110 degrees, and when the thickness of the liquid crystal layer 4 is d and the anisotropic refractive index of the liquid crystal layer 4 is delta n, the value of delta nd of the liquid crystal layer 4 is between 0.49 and 0.53. The backlight plate 7 is a white backlight plate. The reflective polarizer 6 is preferably an RDF-B polarizer.

Specifically, an included angle between the polarization transmission axis of the transmissive polarizer 5 and an angular bisector of the twist angle of the liquid crystal layer 4 is 45 °. The polarization reflection axis of the reflection type polarizer 6 is perpendicular to the polarization transmission axis of the transmission type polarizer 5.

By adopting the structure, the working principle of the LCD display screen is as follows:

when the backlight plate 7 is not lit, the LCD display screen is a reflective LCD, i.e., a positive display type LCD. Specifically, when the LCD panel is not powered, light enters from the polarization state of the polarization axis of the transmissive polarizer 5, passes through the optical rotation of the liquid crystal layer 4, and has a polarization direction perpendicular to the polarization axis of the transmissive polarizer 5 and parallel to the polarization reflection axis of the reflective polarizer 6, and is reflected by the reflective polarizer 6, and the light path is reversible and is transmitted from the transmissive polarizer 5, and the ground color is white. When the LCD display screen is electrified, light enters from the polarization state of the polarization axis of the transmission type polarizer 5, the polarization direction of the polarized light by the liquid crystal layer 4 is not changed, the polarization direction of the light is perpendicular to the polarization reflection axis of the reflection type polarizer 6, the light is transmitted to the last layer of the semi-transparent black film of the transmission type polarizer 6 to be reflected, the light path is reversible, and the light is seen as black characters.

When the backlight plate 7 is lit, the LCD display screen is a transmissive LCD, that is, a negative display type LCD. Specifically, when the LCD panel is not powered on, the light passes through the reflective polarizer 6 to form polarized light perpendicular to the polarization reflection axis of the reflective polarizer 6, and through the optical rotation of the liquid crystal layer 4, the polarized light becomes polarized light having a polarization direction parallel to the polarization reflection axis of the reflective polarizer 6, i.e., perpendicular to the polarization transmission axis of the transmissive polarizer 5, the polarized light cannot be transmitted through the transmissive polarizer 5, and the ground color is black. When the LCD display is powered on, the light passes through the reflective polarizer 6 to form polarized light perpendicular to the polarization reflection axis of the reflective polarizer 6, the liquid crystal layer 4 does not change the polarization direction of the polarized light, which is still perpendicular to the polarization reflection axis of the reflective polarizer 6, i.e., parallel to the polarization transmission axis of the transmissive polarizer 5, so that the polarized light can be transmitted through the transmissive polarizer 5, and thus the displayed characters are white.

In summary, in the LCD display screen of this embodiment, the transmissive polarizer 5 is disposed on the side of the surface glass substrate 1 away from the liquid crystal layer 4, the reflective polarizer 6 is disposed on the side of the bottom glass substrate 2 away from the liquid crystal layer 4, the white backlight plate 7 is disposed on the side of the reflective polarizer 6 away from the bottom glass substrate 2, and the driving circuit for driving the backlight plate 7 to be turned on and off is further disposed, so that the LCD display screen can be switched between the positive display mode and the negative display mode, and the compatibility of the LCD display screen is improved.

The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A TN type LCD display screen is characterized by comprising a surface glass substrate, a bottom glass substrate arranged in parallel with the surface glass substrate, frame glue used for connecting the surface glass substrate and the bottom glass substrate, a liquid crystal layer arranged between the surface glass substrate and the bottom glass substrate, a transmission type polaroid arranged on one side of the surface glass substrate far away from the liquid crystal layer, a reflection type polaroid arranged on one side of the bottom glass substrate far away from the liquid crystal layer, a backlight plate arranged on one side of the reflection type polaroid far away from the bottom glass substrate, and a driving circuit used for driving the backlight plate to be turned on and turned off, wherein the twist angle of the liquid crystal layer is between 80 and 110 degrees.

2. A TN type LCD display screen according to claim 1, characterized in that the value of Δ nd of the liquid crystal layer is between 0.49-0.53.

3. A TN mode LCD display screen as recited in claim 1, wherein an angle between a transmission axis of said transmissive polarizer and an angle bisector of a twist angle of said liquid crystal layer is 45 °.

4. A TN mode LCD display screen as recited in claim 1, wherein said reflective polarizer is an RDF-B polarizer.

5. A TN mode LCD display screen as recited in claim 1, wherein a reflection axis of said reflective polarizer is orthogonal to a transmission axis of said transmissive polarizer.