Patent Publication Number: US-2017371191-A1

Title: Liquid crystal display panel and liquid crystal display apparatus

Description:
FIELD OF THE INVENTION 
     The present invention relates to the technical field of a display, and particularly to a liquid crystal display panel and a liquid crystal display apparatus. 
     BACKGROUND OF THE INVENTION 
     With the continuing development of liquid crystal displays (LCD), the contrast, the brightness, the color gamut, and other characteristics of liquid crystal displays are correspondingly improved. In most cases, the existing liquid crystal displays have been able to meet people&#39;s demand for information display. 
     However, in the outdoor environment under intense light, due to the influence of ambient light, the display characteristics of the liquid crystal displays will deteriorate, causing the users to have difficulty in clearly seeing the content on the screen. Nevertheless, the devices often used in daily life, such as cell phones, watches and other wearable devices, as well as outdoor equipment and facilities, are inevitably used in the outdoor environment under intense light. When the liquid crystal display is in the dark state, the liquid crystal display has a very low penetration, and at this time, the backlight is blocked by the liquid crystal display, and the ambient light can not penetrate the panel to reach the reflection film. Thus, the display effect is not affected. 
     However, when the liquid crystal display is in the bright state, the backlight can reach the eyes through the liquid crystal display and the intense ambient light can reach the reflection film through the panel and be reflected into the eyes. Therefore, when the ambient light is intense, the display effect of the liquid crystal display is affected, making it difficult for the users to clearly see the content on the screen, resulting in a poor display effect. 
     Therefore, it is necessary to provide a liquid crystal panel and a liquid crystal apparatus to solve the problem in the conventional technique. 
     SUMMARY OF THE INVENTION 
     A primary object of the present invention is to provide a liquid crystal display panel and a liquid crystal display apparatus for resolving the technical problem of the poor display effect of the liquid crystal display panel and the liquid crystal display apparatus in the conventional technique used in the outdoor environment under intense light. 
     To achieve the above object, the present invention provides a liquid crystal display panel, comprising:
         a first substrate including:
           a first base; and   an upper polarizing film positioned on the first base;   
           a liquid crystal layer between the first substrate and a second substrate; and   the second substrate disposed opposite to the first substrate, the second substrate including:
           a second base;   a lower polarizing film positioned under the second base; and   a wave plate positioned under the lower polarizing film, and used to reduce ambient light reflected by a reflection film, the wave plate being a quarter wave plate, a half wave plate, or a combination of the quarter wave plate and the half wave plate, wherein an angle between a direction of an absorption axis of the lower polarizing plate and a direction of a fast axis of the wave plate is 45 degrees or 135 degrees.   
               

     In the liquid crystal display panel of the present invention, the first substrate is a color filter substrate, and the second substrate is an array substrate. 
     In the liquid crystal display panel of the present invention, the first substrate further includes a black matrix layer, a color resist layer, and a transparent conductive layer. 
     In the liquid crystal display panel of the present invention, a material of the upper polarizing film and the lower polarizing film is polyvinyl alcohol. 
     To achieve the above object, the present invention provides a liquid crystal display panel, comprising:
         a first substrate including:
           a first base; and   an upper polarizing film positioned on the first base;   
           a liquid crystal layer between the first substrate and a second substrate; and   the second substrate disposed opposite to the first substrate, the second substrate including:
           a second base;   a lower polarizing film positioned under the second base; and   a wave plate positioned under the lower polarizing film, and used to reduce ambient light reflected by a reflection film.   
               

     In the liquid crystal display panel of the present invention, the wave plate is a quarter wave plate, a half wave plate, or a combination of the quarter wave plate and the half wave plate. 
     In the liquid crystal display panel of the present invention, an angle between a direction of an absorption axis of the lower polarizing plate and a direction of a fast axis of the wave plate is 45 degrees or 135 degrees. 
     In the liquid crystal display panel of the present invention, the first substrate is a color filter substrate, and the second substrate is an array substrate. 
     In the liquid crystal display panel of the present invention, a material of the upper polarizing film and the lower polarizing film is polyvinyl alcohol. 
     To achieve the above object, the present invention provides a liquid crystal display apparatus, comprising:
         a backlight module including a reflection film; and   a liquid crystal display panel including:
           a first substrate including:
               a first base; and   an upper polarizing film positioned on the first base;   
               a liquid crystal layer between the first substrate and a second substrate; and   the second substrate disposed opposite to the first substrate, the second substrate including:
               a second base;   a lower polarizing film positioned under the second base; and   a wave plate positioned under the lower polarizing film, and used to reduce ambient light reflected by the reflection film.   
               
               

     In the liquid crystal display apparatus of the present invention, the wave plate is a quarter wave plate, a half wave plate, or a combination of the quarter wave plate and the half wave plate. 
     In the liquid crystal display apparatus of the present invention, an angle between a direction of an absorption axis of the lower polarizing plate and a direction of a fast axis of the wave plate is 45 degrees or 135 degrees. 
     In the liquid crystal display apparatus of the present invention, the first substrate is a color filter substrate, and the second substrate is an array substrate. 
     In the liquid crystal display apparatus of the present invention, a material of the upper polarizing film and the lower polarizing film is polyvinyl alcohol. 
     By disposing the wave plate under the lower polarizing film of the conventional panel, the liquid crystal display panel and the liquid crystal display apparatus of the present invention prevent ambient light from entering the panel and being reflected by the reflection film and enhance the display effect, especially in an outdoor environment under intense light. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic structure of a liquid crystal panel of the present invention; and 
         FIG. 2  is a schematic structure of the optical path principle of a liquid crystal panel of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The following description of the embodiments with reference to the accompanying drawings is used to illustrate particular embodiments of the present invention. The directional terms referred in the present invention, such as “upper”, “lower”, “front”, “back”, “left”, “right”, “inner”, “outer”, “side surface”, etc. are only directions with regard to the accompanying drawings. Therefore, the directional terms used for describing and illustrating the present invention are not intended to limit the present invention. 
     Please refer to  FIG. 1 , which is a schematic structure of a liquid crystal panel of the present invention. 
     As shown in  FIG. 1 , the liquid crystal display panel of the present invention includes a first substrate  10 , a second substrate  20 , and a liquid crystal layer  30 . The first substrate  10  includes a first base  11  and an upper polarizing film  12  positioned on the first base. The liquid crystal layer  30  is positioned between the first substrate  10  and the second substrate  20 . The second substrate  20  is disposed opposite to the first substrate  10 . 
     The second substrate  20  includes a second base  21 , a lower polarizing film  22 , and a wave plate  23 . The lower polarizing film  22  is positioned under the second base  21 , and the wave plate  23  is positioned under the lower polarizing film  22 . The wave plate  23  is used to reduce ambient light reflected by a reflection film 
     As shown in  FIG. 2 , when the ambient light is emitted through the lower polarizing film  22  to the wave plate  23 , the wave plate  23  turns the ambient light into circularly polarized light “a”. After reflected by the reflection film  40 , the circularly polarized light “a” is present as reverse direction circularly polarized light “b”. After passing through the wave plate  23 , the reverse direction circularly polarized light “b” is turned into circularly polarized light “c”. Since the angle of the circularly polarized light “c” is perpendicular to the absorption axis of the lower polarizing film  22 , the polarized light cannot reach the eyes through the lower polarizing film after being processed by the wave plate  23 , thereby eliminating the influence of the intense ambient light on the display effect of the display panel, and enhancing the display effect. 
     Furthermore, since the ambient light enters the backlight module, the ambient light can be used as backlight, which reduces the power consumption of backlight, and improves the utilization of the ambient light. 
     Preferably, the wave plate  23  is a quarter wave plate, a half wave plate, or a combination of a quarter wave plate and a half wave plate. 
     In order to prevent the ambient light from being reflected by the reflection film to enter the eye, the angle between the direction of the absorption axis of the lower polarizing plate  22  and the direction of the fast axis of the wave plate  23  is 45 degrees or 135 degrees. If the angle is too large or too small, the angle between the linear polarized light processed by the reflection film and the absorption axis of the lower polarizing plate cannot be 90 degrees. Therefore, when the above requirement is met, the ambient light which enters the panel and is reflected by the reflection film can be more effectively prevented from entering the eyes. 
     The first substrate  10  may be a color filter substrate, and the second substrate  20  may be an array substrate. When it is an array substrate, the second substrate  20  may include multiple data lines and multiple scan lines, as well as the multiple pixel units defined by the multiple data lines and the multiple scan lines. When it is a color filter substrate, the first substrate  10  may include a black matrix layer, a color resist layer, and a transparent conductive layer. 
     Preferably, the material of the upper polarizing film and the lower polarizing film is polyvinyl alcohol. 
     Since the wave plate is disposed under the lower polarizing film, the liquid crystal display panel of the present invention prevents ambient light from entering the panel and being reflected by the reflection film, and enhances the display effect. 
     The present invention also provides a liquid crystal display apparatus including a backlight module and a liquid crystal display panel. The backlight module includes a reflection film, As shown in  FIG. 1 , the liquid crystal display panel includes a first substrate  10 , a second substrate  20 , and a liquid crystal layer  30 . The first substrate  10  includes a first base  11  and an upper polarizing film  12  positioned on the first base. The liquid crystal layer  30  is positioned between the first substrate  10  and the second substrate  20 . The second substrate  20  is disposed opposite to the first substrate  10 . 
     The second substrate  20  includes a second base  21 , a lower polarizing film  22 , and a wave plate  23 . The lower polarizing film  22  is positioned under the second base  21 , and the wave plate  23  is positioned under the lower polarizing film  22 . The wave plate  23  is used to reduce ambient light reflected by a reflection film 
     As shown in  FIG. 2 , when the ambient light is incident from the lower polarizing film  22  to the wave plate  23 , the wave plate  23  turns the ambient light into circularly polarized light “a”. After reflected by the reflection film  40 , the circularly polarized light “a” is present as reverse direction circularly polarized light “b”. After passing through the wave plate  23 , the reverse direction circularly polarized light “b” is turned into circularly polarized light “c”. Since the angle of the circularly polarized light “c” is perpendicular to the absorption axis of the lower polarizing film  22 , the polarized light cannot reach the eyes through the lower polarizing film after being processed by the wave plate  23 , thereby eliminating the influence of the intense ambient light on the display effect of the display panel, and enhancing the display effect. 
     Furthermore, since the ambient light enters the backlight module, the ambient light can be used as backlight, which reduces the power consumption of backlight, and improves the utilization of the ambient light. 
     Preferably, the wave plate  23  is a quarter wave plate, a half wave plate, or a combination of a quarter wave plate and a half wave plate. 
     In order to prevent the ambient light from being reflected by the reflection film to enter the eye, the angle between the direction of the absorption axis of the lower polarizing plate  22  and the direction of the fast axis of the wave plate  23  is 45 degrees or 135 degrees. If the angle is too large or too small, the angle between the linear polarized light processed by the reflection film and the absorption axis of the lower polarizing plate cannot be 90 degrees. 
     Therefore, when the above requirement is met, the ambient light which enters the panel and is reflected by the reflection film can be more effectively prevented from entering the eyes. 
     The first substrate  10  may be a color filter substrate, and the second substrate  20  may be an array substrate. When it is an array substrate, the second substrate  20  may include multiple data lines and multiple scan lines, as well as the multiple pixel units defined by the multiple data lines and the multiple scan lines. When it is a color filter substrate, the first substrate  10  may include a black matrix layer, a color resist layer, and a transparent conductive layer. 
     Preferably, the material of the upper polarizing film and the lower polarizing film is polyvinyl alcohol. 
     Since the wave plate is disposed under the lower polarizing film, the liquid crystal display panel of the present invention prevents ambient light from entering the panel and being reflected by the reflection film, and enhances the display effect. 
     In summary, although the preferable embodiments of the present invention have been disclosed above, the embodiments are not intended to limit the present invention. A person of ordinary skill in the art, without departing from the spirit and scope of the present invention, can make various modifications and variations. Therefore, the scope of the invention is defined in the claims.