Patent Publication Number: US-2018052360-A1

Title: Liquid crystal display panel

Description:
FIELD OF THE INVENTION 
     The present invention relates to a liquid crystal display field, and more particularly to a liquid crystal display panel. 
     BACKGROUND OF THE INVENTION 
     With the gradual development of products and applications of wearable devices, such as intelligent watches, intelligent glasses, etc., given a fixed quantity of electricity of a battery, the endurance ability of the whole of the product will be greatly influenced by an energy consumption issue, so that the development of a low-consumption/high-performance display is important. 
     According to an analysis of the purpose and the habits of people using liquid crystal display panels, a high performance display is necessary (high resolution, high contrast, high color gamut, etc.), but as an alternative, a low-consumption/low-performance display, may be selected in some application situations. 
     In other words, when watching a video or image, the high-performance liquid crystal display panel is used to provide the user a bright visual enjoyment; but when the quantity of electricity of the battery is low, or only text information needs to be viewed, a power saving mode of the liquid crystal display panel can be used, so that the liquid crystal display panel under the mode just can display the necessary contents, so as to lengthen the endurance time of the battery. However, the manufacturing cost of the above-mentioned liquid crystal display panel is higher, and the energy saving effect thereof under the power saving mode is not good enough. 
     Hence, it is necessary to provide a liquid crystal display panel which solves the problems existing in the traditional technology. 
     SUMMARY OF THE INVENTION 
     In view of this, the present invention provides a liquid crystal display panel which has a high reflect ratio and a better display effect for displaying images, so as to solve the technical problem: a traditional liquid crystal display panel easily has a low reflect ratio and is poor in color mixture. 
     The present invention provides a liquid crystal display panel, comprising a transmission display area and a reflection display area, wherein the transmission display area includes: 
     an upper substrate;
 
an upper polarizer disposed on an outer surface of the upper substrate and configured to filter a first emergent light with a default polarization condition;
 
a color filter disposed on an inner surface of the upper substrate and configured to filter the first emergent light with a default color wavelength;
 
a lower substrate;
 
a lower polarizer disposed on an outer surface of the lower substrate and configured to filter a first incident light with a default polarization condition;
 
a first pixel electrode disposed on an inner surface of the lower substrate and configured to provide a first driving voltage and a common voltage; and
 
a liquid crystal layer disposed between the color filter and the first pixel electrode, and configured to deflect the first incident light to form the first emergent light;
 
wherein the reflection display area includes:
 
the upper substrate;
 
a half wave plate disposed on an outer surface of the upper substrate and configured to change a polarization condition of a second emergent light;
 
the upper polarizer further disposed on an outer surface of the half wave plate and configured to filter the second emergent light with a default polarization condition;
 
the color filter;
 
a common electrode disposed on an inner surface of the color filter and configured to provide a common voltage;
 
the lower substrate;
 
a second pixel electrode disposed on an inner surface of the lower substrate and configured to provide a second driving voltage and configured to reflect an exterior ambient light; and
 
the liquid crystal layer further disposed between the color filter and the second pixel electrode, and configured to deflect the second incident light to form the second emergent light;
 
wherein the display mode of the transmission display area of the liquid crystal display panel is an IPS display mode or an FFS display mode; and the display mode of the reflection display area of the liquid crystal display panel is an ECB display mode; and
 
wherein the thickness of the liquid crystal layer in the transmission display area is greater than that of the liquid crystal layer in the reflection display area.
 
     In the liquid crystal display panel according to the present invention, the display mode of the transmission display area of the liquid crystal display panel is the FFS display mode; the first pixel electrode includes first sub pixel electrodes configured for providing a first driving voltage and second sub pixel electrodes configured for providing a common voltage, and the first sub pixel electrodes and the second sub pixel electrodes are alternately arranged with each other. 
     In the liquid crystal display panel according to the present invention, the display mode of the transmission display area of the liquid crystal display panel is the IPS display mode; the first pixel electrode includes first sub pixel electrodes configured for providing a first driving voltage and a second sub pixel electrode configured for providing a common voltage; and the first sub pixel electrodes are separately disposed in a first electrode layer of the first pixel electrode, and the second sub pixel electrode is disposed in a second electrode layer of the first pixel electrode, wherein the first electrode layer is separated from the second electrode layer by an insulation layer. 
     In the liquid crystal display panel according to the present invention, the transmission display area further includes a first flat layer disposed between the color filter and the liquid crystal layer; and 
     the reflection display area further includes a second flat layer disposed between the color filter and the common electrode. 
     In the liquid crystal display panel according to the present invention, the transmission display area further includes a first alignment layers disposed between the first flat layer and the liquid crystal layer, and between the liquid crystal layer and the first pixel electrode; and 
     the reflection display area further includes a second alignment layers disposed between the second flat layer and the liquid crystal layer, and between the liquid crystal layer and the second pixel electrode. 
     In the liquid crystal display panel according to the present invention, an included angle between a fast axis direction of the half wave plate and a transmission axis direction of the upper polarizer is 22.5 degrees. 
     In the liquid crystal display panel according to the present invention, the transmission display area further includes a black matrix. 
     In the liquid crystal display panel according to the present invention, the transmission display area further includes a first light source configured to provide the first incident light; and 
     the reflection display area further includes a second light source configured to provide the second incident light. 
     In the liquid crystal display panel according to the present invention, the liquid crystal display panel comprises one transmission display area and one reflection display area, wherein the reflection display area is disposed on a top side of the transmission display area. 
     The present invention provides a liquid crystal display panel, comprising a transmission display area and a reflection display area, wherein the transmission display area includes: 
     an upper substrate;
 
an upper polarizer disposed on an outer surface of the upper substrate and configured to filter a first emergent light with a default polarization condition;
 
a color filter disposed on an inner surface of the upper substrate and configured to filter the first emergent light with a default color wavelength;
 
a lower substrate:
 
a lower polarizer disposed on an outer surface of the lower substrate and configured to filter a first incident light with a default polarization condition;
 
a first pixel electrode disposed on an inner surface of the lower substrate and configured to provide a first driving voltage and a common voltage; and
 
a liquid crystal layer disposed between the color filter and the first pixel electrode, and configured to deflect the first incident light to form the first emergent light;
 
wherein the reflection display area includes:
 
the upper substrate;
 
a half wave plate disposed on an outer surface of the upper substrate and configured to change a polarization condition of a second emergent light;
 
the upper polarizer further disposed on an outer surface of the half wave plate and configured to filter the second emergent light with a default polarization condition;
 
the color filter;
 
a common electrode disposed on an inner surface of the color filter and configured to provide a common voltage;
 
the lower substrate;
 
a second pixel electrode disposed on an inner surface of the lower substrate and configured to provide a second driving voltage and configured to reflect an exterior ambient light; and
 
the liquid crystal layer further disposed between the color filter and the second pixel electrode, and configured to deflect the second incident light to form the second emergent light.
 
     In the liquid crystal display panel according to the present invention, the display mode of the transmission display area of the liquid crystal display panel is an IPS display mode or an FFS display mode; and the display mode of the reflection display area of the liquid crystal display panel is an ECB display mode. 
     In the liquid crystal display panel according to the present invention, the display mode of the transmission display area of the liquid crystal display panel is the FFS display mode; the first pixel electrode includes first sub pixel electrodes configured for providing a first driving voltage and second sub pixel electrodes configured for providing a common voltage, and the first sub pixel electrodes and the second sub pixel electrodes are alternately arranged with each other. 
     In the liquid crystal display panel according to the present invention, the display mode of the transmission display area of the liquid crystal display panel is the IPS display mode; the first pixel electrode includes first sub pixel electrodes configured for providing a first driving voltage and a second sub pixel electrode configured for providing a common voltage; and the first sub pixel electrodes are separately disposed in a first electrode layer of the first pixel electrode, and the second sub pixel electrode is disposed in a second electrode layer of the first pixel electrode, wherein the first electrode layer is separated from the second electrode layer by an insulation layer. 
     In the liquid crystal display panel according to the present invention, the transmission display area further includes a first flat layer disposed between the color filter and the liquid crystal layer; and 
     the reflection display area further includes a second flat layer disposed between the color filter and the common electrode. 
     In the liquid crystal display panel according to the present invention, the transmission display area further includes a first alignment layers disposed between the first flat layer and the liquid crystal layer, and between the liquid crystal layer and the first pixel electrode; and 
     the reflection display area further includes a second alignment layers disposed between the second flat layer and the liquid crystal layer, and between the liquid crystal layer and the second pixel electrode. 
     In the liquid crystal display panel according to the present invention, the thickness of the liquid crystal layer in the transmission display area is greater than that of the liquid crystal layer in the reflection display area. 
     In the liquid crystal display panel according to the present invention. an included angle between a fast axis direction of the half wave plate and a transmission axis direction of the upper polarizer is 22.5 degrees. 
     In the liquid crystal display panel according to the present invention, the transmission display area further includes a black matrix. 
     In the liquid crystal display panel according to the present invention, the transmission display area further includes a first light source configured to provide the first incident light; and 
     the reflection display area further includes a second light source configured to provide the second incident light. 
     In the liquid crystal display panel according to the present invention, the liquid crystal display panel comprises one transmission display area and one reflection display area, wherein the reflection display area is disposed on a top side of the transmission display area. 
     By disposing the transmission display area and the reflection display area, the liquid crystal display panel according to the present invention can sufficiently use an ambient light in a power saving situation, so that it has a high reflect ratio and a better color image display effect, so as to solve the technical problem: a traditional liquid crystal display panel easily has a low reflect ratio and is poor in color mixture. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       In order to more clearly illustrate the utility model embodiments or the prior art technical solutions, the embodiment is simply described with needed accompanying drawings. The following description the drawings are merely the utility model to some embodiments, those of ordinary skill in the art, without creative efforts, can derive other drawings from these drawings. 
         FIG. 1  is a schematic structural view of a liquid crystal display panel according to a preferred embodiment of the present invention; 
         FIG. 2  is an partial enlarged view of an A-part in  FIG. 1 ; 
         FIG. 3  is a cross section view of a cross section line B-B′ of  FIG. 2 ; 
         FIG. 4  is one schematic structural view of a first pixel electrode of a liquid crystal display panel according to the present invention; and 
         FIG. 5  is another one schematic structural view of a first pixel electrode of a liquid crystal display panel according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to the drawings, wherein the same reference numbers stand for same assemblies. The descriptions below are based on specific embodiments of the illustrated present disclosure, and the specific embodiments should not be considered as a limitation to other specific embodiments not described herein. 
     Refer now to  FIG. 1  to  FIG. 3 , wherein  FIG. 1  is a schematic structural view of a liquid crystal display panel according to a preferred embodiment of the present invention;  FIG. 2  is an partial enlarged view of an A-part in  FIG. 1 ; and  FIG. 3  is a cross section view of a cross section line B-B′ of  FIG. 2 . 
     As shown in  FIGS. 1 and 2 , the liquid crystal display panel according to the preferred embodiment comprises a transmission display area and a reflection display area, wherein the transmission display area displays an image by a light transmission of a backlight light source, and the reflection display area displays an image by a reflection of an exterior ambient light or a light transmission of a backlight light source. In the preferred embodiment, the liquid crystal display panel comprises one transmission display area and one reflection display area, wherein the reflection display area is disposed on a top side of the transmission display area. In  FIG. 2 , R 1  is a red pixel of the reflection display area, B 1  is a blue pixel of the reflection display area, and G 1  is a green pixel of the reflection display area; and R 2  is a red pixel of the transmission display area, B 2  is a blue pixel of the transmission display area, and G 2  is a green pixel of the transmission display area. 
     Refer now to  FIG. 3 , the transmission display area of the liquid crystal display panel includes an upper substrate  301 , an upper polarizer  302 , a color filter  303 , a lower substrate  304 , a lower polarizer  305 , a first pixel electrode  306 , a liquid crystal layer  307 , a first flat layer  308 , two first alignment layers  309 , a first light source (not shown in the figures), and a black matrix  310 . 
     The upper polarizer  302  is disposed on an outer surface of the upper substrate  301 , and is used to filter a first emergent light with a default polarization condition. The color filter  303  is disposed on an inner surface of the upper substrate  301 , and is used to filter the first emergent light with a default color wavelength. The lower polarizer  305  is disposed on an outer surface of the lower substrate  304 , and is used to filter a first incident light with a default polarization condition. The first pixel electrode  306  is disposed on an inner surface of the lower substrate  304 , and is used to provide a first driving voltage and a common voltage. The liquid crystal layer  307  is disposed between the color filter  303  and the first pixel electrode  306 , and is used to deflect the first incident light to form the first emergent light. 
     The first flat layer  308  is disposed between the color filter  303  and the liquid crystal layer  307 , and is used to process a planarization to an inner surface of the color filter  303 . The first alignment layers  309  are disposed between the first flat layer  308  and the liquid crystal layer  307 , and between the liquid crystal layer  307  and the first pixel electrode  306 , and are used to process an alignment to liquid crystal molecules of the liquid crystal layer  307  in the transmission display area. The first light source is used to provide the incident light. The black matrix  310  is used to separate the color filters with different colors. 
     The reflection display area of the liquid crystal display panel includes an upper substrate  301 , a half wave plate  311 , an upper polarizer  302 , a color filter  303 , a common electrode  312 , a lower substrate  304 , a lower polarizer  305 , a second pixel electrode  313 , a liquid crystal layer  307 , a second flat layer  314 , and two second alignment layers  315 . 
     The half wave plate  311  is disposed on an outer surface of the upper substrate  301 , and is used to change a polarization condition of a second emergent light. The upper polarizer  302  is further disposed on an outer surface of the half wave plate  311 , and is used to filter the first emergent light with a default polarization condition. The common electrode  312  is disposed on an inner surface of the color filter  303 , and is used to provide a common voltage. The second pixel electrode  313  is disposed on an inner surface of the lower substrate  304 , and is used to provide a second driving voltage and used to reflect an exterior ambient light. The liquid crystal layer  307  is further disposed between the color filter  303  and the second pixel electrode  313 , and is used to deflect the second incident light to form the second emergent light. 
     The second flat layer  314  is disposed between the color filter  303  and the common electrode  312 , and is used to process a planarization to an inner surface of the color filter  303 . The second alignment layers  315  are disposed between the second flat layer  314  and the liquid crystal layer  307 , and between the liquid crystal layer  307  and the second pixel electrode  313 , and are used to process an alignment to liquid crystal molecules of the liquid crystal layer  307  in the reflection display area. 
     The thickness of the liquid crystal layer  307  in the transmission display area is greater than that of the liquid crystal layer  307  in the reflection display area, for example, the thickness of the liquid crystal layer  307  in the transmission display area is twice the thickness of the liquid crystal layer  307  in the reflection display area, so that the display difference between the transmission display area and the reflection display area can be less. An included angle between a fast axis direction of the half wave plate  311  and a transmission axis direction of the upper polarizer  302  is 22.5 degrees. 
     The display mode of the transmission display area of the liquid crystal display panel according to the preferred embodiment is an FFS (Fringe Field Switching) display mode or an IPS (In-Plane Switching) display mode. The display mode of the reflection display area of the liquid crystal display panel according to the preferred embodiment is an ECB (electrically controlled birefringence) display mode. 
     If the display mode of the transmission display area of the liquid crystal display panel is the EFS display mode, a structure of a first pixel electrode  406  is shown in  FIG. 4 , wherein the first pixel electrode  406  includes first sub pixel electrodes  4061  used for providing a first driving voltage and second sub pixel electrodes  4062  used for providing a common voltage, and the first sub pixel electrodes  4061  and the second sub pixel electrodes  4062  are alternately arranged with each other. 
     If the display mode of the transmission display area of the liquid crystal display panel is the IPS display mode, a structure of a first pixel electrode  506  is shown in  FIG. 5 , wherein the first pixel electrode  506  includes first sub pixel electrodes  5061  used for providing a first driving voltage and a second sub pixel electrode  5062  used for providing a common voltage. The first sub pixel electrodes  5061  are separately disposed in a first electrode layer of the first pixel electrode  506 , and the second sub pixel electrode  5062  is disposed in a second electrode layer of the first pixel electrode  506 , wherein the first electrode layer is separated from the second electrode layer by an insulation layer  5063 . 
     When the liquid crystal display panel according to the preferred embodiment is used, if the liquid crystal display panel is under a high-performance display mode, the transmission display area of the liquid crystal display panel is active, and the first pixel electrode  306  is inputted a first driving voltage and a common voltage. That is, the first light source provides a first incident light, and the first incident light is transformed into a first incident light with a default polarization condition through the lower polarizer  305 . The first incident light with the default polarization condition is deflected through the liquid crystal layer  307 , and then transformed into a first emergent light with a default color wavelength through the color filter  303 , and finally the first emergent light with the default polarization condition is outputted through the upper polarizer  302 , so as to carry out a display of color image. The transmission display area of the liquid crystal display panel is in a bright situation. 
     The reflection display area of the liquid crystal display panel is inactive, and the second pixel electrode  313  and the common electrode  312  are not inputted signals. An exterior ambient light of the reflection display area of the liquid crystal display panel is transformed into an exterior ambient light with a default polarization condition through the upper polarizer  302 , such as a line polarization light of 90 degrees. The exterior ambient light with the default polarization condition then passes through the half wave plate  311  (the fast axis direction of the half wave plate  311  is 67.5 degrees), and the polarization direction thereof is rotated 45 degrees, such as a line polarization light of 45 degrees. Next, the exterior ambient light passes through the liquid crystal layer  307 , and is reflected by the second pixel electrode  313  to be transformed into a second incident light. The second incident light passes through the liquid crystal layer  307  again to be transformed into a second emergent light, and the polarization degree of the second emergent light is 135 degrees. The second emergent light passes through the color filter  303  to be transformed into the second emergent light with a default color wavelength, and finally the second emergent light with the default color wavelength is outputted through the half wave plate  311  to be transformed into the second emergent light of 0 degrees, and is stopped by the upper polarizer  302 . The reflection display area of the liquid crystal display panel is in a dark situation, namely the reflection display area of the liquid crystal display panel is under a normal black display mode. 
     When the liquid crystal display panel is under a power saving display mode, the reflection display area of the liquid crystal display panel is active. That is: 
     the second pixel electrode  313  is inputted a second voltage, and the common electrode  312  is inputted a common voltage. An exterior ambient light of the reflection display area of the liquid crystal display panel is transformed into an exterior ambient light with a default polarization condition through the upper polarizer  302 , such as a line polarization light of 90 degrees. The exterior ambient light with a default polarization condition then passes through the half wave plate  311  (the fast axis direction of the half wave plate  311  is 67.5 degrees), and the polarization direction thereof is rotated 45 degrees, such as a line polarization light of 45 degrees. Next, the exterior ambient light passes through the liquid crystal layer  307  (at this moment, the liquid crystal molecules are vertically arranged, and without anisotropic), and is reflected by the second pixel electrode  313  to be transformed into a second incident light. The second incident light passes through the liquid crystal layer  307  again to be transformed into a second emergent light. The second emergent light passes through the color filter  303  to be transformed into the second emergent light with a default color wavelength, and finally the second emergent light with the default color wavelength is outputted through the half wave plate  311  to be transformed into the second emergent light of 90 degree, and can be outputted through the upper polarizer  302 , so as to carry out a display of color image. The reflection display area of the liquid crystal display panel is brightened. 
     The transmission display area of the liquid crystal display panel is inactive, and the first pixel electrode  306  is not inputted a signal. At this moment, the first light source does not emit the first incident light, so that the transmission display area of the liquid crystal display panel is darkened, namely the transmission display area of the liquid crystal display panel is under a normal black display mode. 
     Preferably, the liquid crystal display panel further comprises a second light source (not shown in figures) used to provide a second incident light. When the liquid crystal display panel is under power saving mode, if the brightness of the exterior ambient light is lower, the second incident light can be used to directly provide the second incident light to the reflection display area. 
     The present invention has been described with preferred embodiments thereof and it is understood that many changes and modifications to the described embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.