VA liquid crystal display screen capable of being read in sunshine

Abstract

The utility model discloses a sunshine readable VA liquid crystal display screen, which sequentially comprises an upper polaroid, a VA liquid crystal display screen, a lower polaroid and backlight from top to bottom, the lower polaroid comprises a 15B semi-transparent and semi-reflecting film, and the compensation values of a phase difference film in the upper polaroid are Re = 55 + / -5nm and Rth = 220 + / -15nm. According to the VA liquid crystal display screen, on the premise that backlight brightness does not need to be increased, the problem that a VA display screen is not high in readability in the sun is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of black and white VA liquid crystal display screens, in particular to a VA liquid crystal display screen that is readable in sunlight. Background Art

[0002] Currently, the black and white VA LCD screens on the market do not have high enough contrast in sunlight. When used for two-wheeled vehicle instruments, the readability of the display screen in outdoor sunlight is low, affecting the user experience and even posing a driving safety hazard. To improve the contrast and readability of VA screens in sunlight, LCD manufacturers have no choice but to continuously increase the backlight brightness to increase the brightness of the display fonts. This practice will greatly shorten the service life of the backlight LED lamp. In addition, if the backlight brightness is too high, energy consumption will increase, which will reduce the yield of the display screen.

[0003] Therefore, in order to correct the above defects, we propose a sunlight-readable VA liquid crystal display. Summary of the Invention

[0004] The technical problem solved by the utility model is to provide a VA liquid crystal display screen that is readable in sunlight.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a VA liquid crystal display screen readable in sunlight, which comprises, from top to bottom, an upper polarizer, a VA liquid crystal display screen, a lower polarizer and a backlight, wherein the lower polarizer comprises a 15B semi-transparent and semi-reflective film.

[0006] Furthermore, the lower polarizer also includes a pressure-sensitive adhesive, a triacetate cellulose film, a polyvinyl alcohol film, a triacetate cellulose film, an adhesive, and a protective film.

[0007] Furthermore, the upper polarizer includes a protective film, a triacetate cellulose film, a polyvinyl alcohol film, a triacetate cellulose film, glue, a phase difference film, and a pressure-sensitive adhesive.

[0008] Furthermore, the compensation values ​​of the phase difference film in the upper polarizer are Re=55+ / -5nm, Rth=220+ / -15nm.

[0009] Compared with the prior art, the beneficial effect of the present invention is that the solution of the present invention solves the problem of low readability of VA display screens in sunlight without increasing the backlight brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0011] Figure 2 This is a comparison diagram of the utility model before and after improvement.

[0012] Numbers in the figure:

[0013] 1. Upper polarizer; 2. VA LCD screen; 3. Lower polarizer; 4. Backlight. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] The utility model provides a technical solution:

[0016] See also Figure 1-2 A sunlight-readable VA liquid crystal display screen comprises, from top to bottom, an upper polarizer 1, a VA liquid crystal display screen 2, a lower polarizer 3 and a backlight 4, wherein the lower polarizer 3 comprises a 15B semi-transmissive and semi-reflective film.

[0017] The 11A phase difference film in the lower polarizer is removed, but a 15B semi-transparent and semi-reflective film is added. The fully transparent polarizer with the phase difference film is changed to a semi-transparent polarizer with a reflective function, so that the LCD has a reflective function. When used in sunlight, it can reflect sunlight, increase the brightness of the display font, and achieve the purpose of readability in sunlight. That is, the lower polarizer 3 includes pressure-sensitive adhesive, triacetate cellulose film, polyvinyl alcohol film, triacetate cellulose film, adhesive, 15B semi-transparent and semi-reflective film, and protective film.

[0018] The upper polarizer 1 includes a protective film, a triacetyl cellulose film, a polyvinyl alcohol film, a triacetyl cellulose film, glue, a phase difference film, and a pressure-sensitive adhesive. Since the lower polarizer has eliminated the 11A phase difference film, the VA display will leak light at a wide angle, the background color will not be dark enough, and the contrast will decrease. To maintain the contrast of the VA display 2, the structure of the upper polarizer 1 is changed. The compensation value of the 6A phase difference film in the upper polarizer 1 is changed from Re:50+ / -10nm, Rth=130+ / -10nm to 6B. The phase difference film compensation value is Re=55+ / -5nm, Rth=220+ / -15nm. This change can maintain the background color blackness of the VA display and prevent the contrast from decreasing.

[0019] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sunlight-readable VA liquid crystal display, characterized by: From top to bottom, it comprises an upper polarizer (1), a VA liquid crystal display (2), a lower polarizer (3) and a backlight (4), wherein the lower polarizer (3) comprises a 15B semi-transmissive and semi-reflective film.

2. The sunlight-readable VA liquid crystal display according to claim 1, wherein: The lower polarizer (3) further comprises a pressure-sensitive adhesive, a triacetate cellulose film, a polyvinyl alcohol film, a triacetate cellulose film, an adhesive, and a protective film.

3. The sunlight-readable VA liquid crystal display according to claim 1, wherein: The upper polarizer (1) comprises a protective film, a triacetate cellulose film, a polyvinyl alcohol film, a triacetate cellulose film, glue, a phase difference film, and a pressure-sensitive adhesive.

4. The sunlight-readable VA liquid crystal display according to claim 3, wherein: The compensation values ​​of the phase difference film in the upper polarizer (1) are Re=55+ / -5nm, Rth=220+ / -15nm.

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