Vertical orientation passive segment code liquid crystal display without visual angle blind area

Abstract

The utility model provides a vertical orientation passive segment code liquid crystal display without a visual angle blind area, which comprises an upper polaroid, a lower polaroid and a liquid crystal box, the upper polaroid is arranged on the liquid crystal box, and the lower polaroid is arranged below the liquid crystal box; the liquid crystal box is provided with a first box wall and a second box wall which are oppositely arranged in the thickness direction of the liquid crystal box so as to package the liquid crystal layer, the opposite wall faces of the first box wall and the second box wall are both in a sawtooth shape, and sawtooth tooth crests on the first box wall and sawtooth tooth crests on the second box wall are arranged in a staggered mode. The first box wall comprises an upper ITO electrode layer and an upper PI layer arranged on the inner side of the upper ITO electrode layer, and the second box wall comprises a lower ITO electrode layer and a lower PI layer arranged on the inner side of the lower ITO electrode layer; wherein the upper ITO electrode layer and the lower ITO electrode layer are not hollowed out; the friction directions of the upper PI layer and the lower PI layer are the same, and the friction directions are perpendicular to the extension line where the tooth crests of the sawteeth are located.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid crystal display, and in particular relates to a vertically oriented passive segment code liquid crystal display without a viewing angle blind zone. Background Art

[0002] Indium tin oxide (ITO) is an n-type semiconductor material. Due to its outstanding electrical conductivity, visible light transmittance, and mechanical hardness, it is often used as an electrode material in various products, such as the upper and lower electrodes of the display area of ​​vertical alignment passive segment liquid crystal (VA) displays.

[0003] When traditional vertically aligned passive segmented liquid crystal displays are powered on, the negative liquid crystal molecules will tilt, creating a viewing angle blind spot of approximately 15° in the opposite direction of the viewing angle, that is, in the direction of the long axis of the liquid crystal molecules. To solve this viewing angle blind spot and achieve full viewing angle, current vertically aligned passive liquid crystal displays are frictionless and use hollowed-out upper and lower electrodes to achieve an inclined electric field, thereby producing a two-domain orientation in a visual direction. However, in the hollowed-out center area, the absence of an electric field will cause the liquid crystal to be unable to deflect, resulting in black lines. As a result, the actual brightness of the displayed font is reduced by approximately 20% to 30% compared to the normal VA display brightness, making the LCD display display effect unsatisfactory. Utility Model Content

[0004] In order to overcome the defects in the prior art, an embodiment of the present invention provides a vertically aligned passive segment code liquid crystal display without a viewing angle blind zone, which is used to solve the above-mentioned problems.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] The utility model provides a vertically aligned passive segment code liquid crystal display without a viewing angle blind zone, the vertically aligned passive segment code liquid crystal display without a viewing angle blind zone comprises an upper polarizer, a lower polarizer and a liquid crystal box, the upper polarizer is arranged on the liquid crystal box, and the lower polarizer is arranged under the liquid crystal box;

[0007] The liquid crystal cell has a first cell wall and a second cell wall disposed opposite to each other along the thickness direction thereof for encapsulating the liquid crystal layer, the opposing wall surfaces of the first cell wall and the second cell wall are both serrated, and the serrations on the first cell wall are staggered with the serrations on the second cell wall;

[0008] The first cell wall includes an upper ITO electrode layer and an upper PI layer disposed inside the upper ITO electrode layer, and the second cell wall includes a lower ITO electrode layer and a lower PI layer disposed inside the lower ITO electrode layer; wherein,

[0009] The upper ITO electrode layer and the lower ITO electrode layer are not hollowed out;

[0010] The friction directions of the upper PI layer and the lower PI layer are the same, and both friction directions are perpendicular to the extension line of the sawtooth top.

[0011] As a further description of the above technical solution, the first box wall and the second box wall are arranged to face each other in a sawtooth-like manner.

[0012] As a further description of the above technical solution, the angle between the long axis of the liquid crystal molecules in the liquid crystal layer and the normal of the inclined surface of the sawtooth is between 0.1° and 0.3°;

[0013] The angle formed by the transmission axis of the upper polarizer and the rubbing direction of the PI layer is 45°; the transmission axis of the lower polarizer is perpendicular to the transmission axis of the upper polarizer.

[0014] As a further description of the above technical solution, the inclination angle of each inclined surface constituting the sawtooth is between 0.4° and 0.6°;

[0015] The distance from the tooth top to the tooth bottom of each saw tooth is between 6 μm and 12 μm.

[0016] As a further description of the above technical solution, the thickness of the liquid crystal cell is between 3.5 μm and 4.0 μm;

[0017] The optical path difference Δnd of the liquid crystal cell is between 0.30 and 0.32.

[0018] As a further description of the above technical solution, the first box wall further includes an upper glass substrate, and the upper glass substrate is arranged on a side of the upper ITO electrode layer away from the upper PI layer.

[0019] As a further description of the above technical solution, the second box wall further includes a lower glass substrate, and the lower glass substrate is arranged on a side of the lower ITO electrode layer away from the lower PI layer.

[0020] By means of the above technical solutions, the outstanding effects of the present invention are:

[0021] 1. In the vertically aligned passive segmented liquid crystal display with no viewing angle blind zone provided by the present invention, the liquid crystal cell includes a first cell wall and a second cell wall disposed opposite to each other along the thickness direction thereof to encapsulate the liquid crystal layer. The opposing wall surfaces of the first cell wall and the second cell wall are both serrated, and the serrations on the first cell wall and the serrations on the second cell wall are staggered, thereby ensuring uniformity of the cell thickness of the liquid crystal cell.

[0022] 2. In the vertically aligned passive segment LCD with no viewing angle blind zone provided by the present invention, both the upper and lower ITO electrode layers are not hollowed out, ensuring that the entire display area has a vertical electric field after power is applied, without black shadows causing light loss and without the influence of borderless black domains, resulting in a better display effect;

[0023] 3. In the vertically oriented passive segmented liquid crystal display with no viewing angle blind spot provided by the present invention, the rubbing directions of the upper PI layer and the lower PI layer are the same, and the rubbing directions are both perpendicular to the extension line of the sawtooth top, thereby, combined with the inclined surfaces constituting the sawtooth, determining that the liquid crystal molecules (in the liquid crystal layer) have different pre-tilt directions relative to the thickness direction of the liquid crystal box, so that the influence of foreign matter in the box on the tilting direction of the liquid crystal (in the liquid crystal layer) is minimized, which is more conducive to light transmission; and precisely because the liquid crystal molecules have different pre-tilt directions relative to the thickness direction of the liquid crystal box, when a vertical electric field (i.e., an electric field parallel to the thickness direction of the liquid crystal box) is applied, the liquid crystal molecules located at the two inclined surfaces of any sawtooth will tilt in opposite directions, thereby preventing the viewing angle blind spot and realizing full-viewing angle display; at the same time, the rubbing directions of the upper PI layer and the lower PI layer are the same, so that the two inclined surfaces in the same vertical partition (i.e., the sawtooth inclined surface included in the first box wall and the sawtooth inclined surface included in the second box wall opposite thereto) will have one side strengthened and the other side weakened, so that the overall optical path difference Δnd of the liquid crystal box is the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of a vertically aligned passive segmented liquid crystal display without a viewing angle blind zone in an embodiment of the present utility model;

[0025] Figure 2 This is a bottom view of the first cell wall of the liquid crystal cell in the embodiment of the present utility model;

[0026] Figure 3 This is a schematic diagram of the arrangement of liquid crystal molecules in a vertically aligned passive segmented liquid crystal display without a viewing angle blind zone in an embodiment of the present invention in a non-powered state;

[0027] Figure 4 This is a schematic diagram of the arrangement of liquid crystal molecules in a vertically aligned passive segmented liquid crystal display without a viewing angle blind zone in an embodiment of the present invention when powered on.

[0028] Description of Figure Numbers:

[0029] 1. Upper polarizer; 2. Lower polarizer; 3. Liquid crystal cell; 4. Liquid crystal layer; 5. Upper ITO electrode layer; 6. Upper PI layer; 7. Lower ITO electrode layer; 8. Lower PI layer; 9. Upper glass substrate; 10. Lower glass substrate; 11. Tooth top; 12. Bevel. DETAILED DESCRIPTION

[0030] 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.

[0031] In the description of the present invention, it should be noted that the terms "upper", "middle", "lower", "inside", "outside", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes the implementation of the present invention based on its overall structure.

[0032] See also Figures 1 to 4 The utility model discloses a vertically aligned passive segment code liquid crystal display with no viewing angle blind zone, the vertically aligned passive segment code liquid crystal display with no viewing angle blind zone comprises an upper polarizer 1, a lower polarizer 2 and a liquid crystal box 3, wherein the upper polarizer 1 is arranged on the liquid crystal box 3, and the lower polarizer 2 is arranged under the liquid crystal box 3;

[0033] The liquid crystal box 3 has a first box wall and a second box wall arranged opposite to each other along the thickness direction to encapsulate the liquid crystal layer 4, the opposite wall surfaces of the first box wall and the second box wall are serrated, and the sawtooth tops 11 on the first box wall and the sawtooth tops 11 on the second box wall are staggered, thereby ensuring the uniformity of the box thickness of the liquid crystal box 3; the first box wall includes an upper ITO electrode layer 5 and an upper PI layer 6 arranged on the inner side of the upper ITO electrode layer 5, and the second box wall includes a lower ITO electrode layer 7 and a lower PI layer 8 arranged on the inner side of the lower ITO electrode layer 7; wherein, the upper ITO electrode layer 5 and the lower ITO electrode layer 7 are not hollowed out, ensuring that the entire display area will have a vertical electric field after power is applied, there is no black shadow to cause light loss, there is no influence of border black domains, and the display effect of the display is better; and the upper PI The rubbing directions of the layer 6 and the lower PI layer 8 are the same, and the rubbing directions are both perpendicular to the extension line of the sawtooth top 11, so that the inclined surface 12 of the sawtooth and the friction orientation of the two PI layers are combined to determine that the liquid crystal molecules (in the liquid crystal layer 4) have different pre-tilt directions relative to the thickness direction of the liquid crystal box 3, so that the influence of foreign matter in the box on the tilting direction of the liquid crystal molecules is minimized, which is more conducive to light transmission; and precisely because the liquid crystal molecules have different pre-tilt directions relative to the thickness direction of the liquid crystal box 3, when a vertical electric field (i.e., an electric field parallel to the thickness direction of the liquid crystal box 3) is applied, the liquid crystal molecules at the two inclined surfaces 12 of any sawtooth will tilt in opposite directions, thereby preventing a viewing angle blind spot and achieving full viewing angle display; at the same time, the rubbing directions of the upper PI layer 6 and the lower PI layer 8 are the same, so that they are in the same vertical partition (such as Figure 3 and Figure 4 As shown, the two inclined surfaces 12 (i.e., the first box wall includes a serrated inclined surface 12 and the second box wall opposite thereto includes a serrated inclined surface 12) will have one side strengthened and the other side weakened, so that the overall optical path difference Δnd of the liquid crystal box 3 is the same.

[0034] See also Figure 1 、 Figure 3 as well as Figure 4 Specifically, in this embodiment, the first box wall and the second box wall are arranged to face each other in a sawtooth-type manner, that is, if the opposite wall surfaces of the two box walls are placed against each other, the two box walls can be connected with the sawtooth. Such an arrangement ensures the uniformity of the box thickness of the liquid crystal box 3.

[0035] Specifically, in this embodiment, due to the friction orientation of the upper and lower PI layers, the angle between the long axis of the liquid crystal molecules of the liquid crystal layer 4 and the normal of the sawtooth slope 12 is between 0.1° and 0.3°. Preferably, when the upper PI layer 6 and the lower PI layer 8 are rubbed and oriented, the friction torque is controlled to be 12±4kg·cm, which can effectively ensure that the liquid crystal molecules of the liquid crystal layer 4 are tilted in the friction direction due to the friction between the upper PI layer 6 and the lower PI layer 8, and the angle formed with the sawtooth slope 12 is small. The inclination angle of each slope 12 constituting the sawtooth is between 0.4° and 0.6°. The angle formed between the liquid crystal molecules of the liquid crystal layer 4 and the normal of the sawtooth slope 12 is superimposed on it, as shown in FIG. Figure 1 and Figure 3 As shown, the liquid crystal molecules have different pre-tilt directions relative to the thickness direction of the liquid crystal cell 3, as shown in FIG. Figure 4 As shown, after applying a vertical electric field (i.e., an electric field parallel to the thickness direction of the liquid crystal box 3), the liquid crystal molecules located at the two inclined surfaces 12 of the same sawtooth will tilt in opposite directions, thereby preventing the occurrence of viewing angle blind spots between adjacent vertical partitions and realizing full-viewing angle display. More specifically, for example, in an extreme case, after the upper and lower PI layers are rubbed and aligned in the same direction, the angle between the long axis of the liquid crystal molecules in the liquid crystal layer 4 and the normal of the sawtooth slope 12 is 0.3°, and the tilt angle of each slope 12 constituting the sawtooth is 0.4°. Then, in the same vertical partition, the long axis of the liquid crystal molecules is at an angle of 0.4° (0.4°+0.3°=0.7°) with the vertical direction at one sawtooth slope 12, and this slope 12 is the strengthening surface. The long axis of the liquid crystal molecules is at an angle of 0.1° (0.4°-0.3°=0.1°) with the vertical direction at another sawtooth slope 12, and this slope 12 is the weakening surface, which can still ensure that the liquid crystal molecules have a pre-tilt angle of 0.1° with the vertical direction. In other words, the tilt angle of the slope 12 is to compensate for the angle of friction of the weakening surface, ensuring that the liquid crystal molecules in adjacent vertical partitions (i.e., adjacent display cells) have different tilt directions after the vertical electric field is applied, thereby achieving full-viewing angle display. Specifically, in this embodiment, the angle formed by the transmission axis of the upper polarizer 1 and the friction direction of the PI layer is 45°, and the transmission axis of the lower polarizer 2 is perpendicular to the transmission axis of the upper polarizer 1. The principle of generating the viewing blind area is still consistent with the prior art and will not be elaborated here. By adopting the above-mentioned structure in this embodiment, the viewing blind area problem can be effectively solved and full-viewing angle display can be achieved; wherein, the distance from the tooth top 11 to the tooth bottom of each sawtooth is between 6μm-12μm.

[0036] Preferably, in this embodiment, the thickness of the liquid crystal cell 3 is between 3.5 μm and 4.0 μm, and the optical path difference Δnd is between 0.30 and 0.32.

[0037] Specifically, in this embodiment, the first box wall further includes an upper glass substrate 9 , which is disposed on a side of the upper ITO electrode layer 5 away from the upper PI layer 6 , that is, the upper glass substrate 9 is located outside the upper ITO electrode layer 5 .

[0038] Specifically, in this embodiment, the second box wall further includes a lower glass substrate 10 , which is arranged on the side of the lower ITO electrode layer 7 away from the lower PI layer 8 , that is, the lower glass substrate 10 is located outside the lower ITO electrode layer 7 .

[0039] Specifically, in this embodiment, the first box wall is composed of an upper glass substrate 9, an upper ITO electrode layer 5, and an upper PI layer 6, and the first box wall is composed of a lower glass substrate 10, a lower ITO electrode layer 7, and a lower PI layer 8, so that the wall surfaces of the first box wall and the second box wall are serrated, mainly so that the upper PI layer 6 and the lower PI layer 8 are serrated in the thickness direction. Of course, in other embodiments, the inner surface of the upper glass substrate 9 and the lower glass substrate 10 can be directly serrated, and the ITO electrode layer and the PI layer on the corresponding inner side of the two are normally applied along their respective inclination angles, and finally the wall surfaces of the first box wall and the second box wall are serrated; or the inner surface of the upper glass substrate 9 and the lower glass substrate 10 is still a regular horizontal plate surface, so that the upper ITO electrode layer 5 and the lower ITO electrode layer 7 are serrated in the thickness direction, and a conventional PI layer is arranged along the inclination angle of the two electrode layers, and finally the wall surfaces of the first box wall and the second box wall are serrated.

[0040] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any changes, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vertically aligned passive segment liquid crystal display with no viewing angle blind zone, characterized in that: It includes an upper polarizer, a lower polarizer and a liquid crystal box, wherein the upper polarizer is arranged on the liquid crystal box, and the lower polarizer is arranged under the liquid crystal box; The liquid crystal cell has a first cell wall and a second cell wall disposed opposite to each other along the thickness direction thereof for encapsulating the liquid crystal layer, the opposing wall surfaces of the first cell wall and the second cell wall are both serrated, and the serrations on the first cell wall are staggered with the serrations on the second cell wall; The first cell wall includes an upper ITO electrode layer and an upper PI layer disposed inside the upper ITO electrode layer, and the second cell wall includes a lower ITO electrode layer and a lower PI layer disposed inside the lower ITO electrode layer; wherein, The upper ITO electrode layer and the lower ITO electrode layer are not hollowed out; The friction directions of the upper PI layer and the lower PI layer are the same, and both friction directions are perpendicular to the extension line of the sawtooth top.

2. The vertically aligned passive segmented liquid crystal display with no viewing angle blind zone according to claim 1, characterized in that: The first box wall and the second box wall are arranged to face each other in a sawtooth-alignable manner.

3. The vertically aligned passive segmented liquid crystal display with no viewing angle blind zone according to claim 1, characterized in that: The angle between the long axis of the liquid crystal molecules in the liquid crystal layer and the normal of the inclined surface of the sawtooth is between 0.1° and 0.3°; The angle formed by the transmission axis of the upper polarizer and the rubbing direction of the PI layer is 45°; the transmission axis of the lower polarizer is perpendicular to the transmission axis of the upper polarizer.

4. The vertically aligned passive segmented liquid crystal display with no viewing angle blind zone according to claim 3, characterized in that: The inclination angle of each inclined surface constituting the sawtooth is between 0.4° and 0.6°; The distance from the tooth top to the tooth bottom of each saw tooth is between 6 μm and 12 μm.

5. The vertically aligned passive segmented liquid crystal display with no viewing angle blind zone according to claim 1, characterized in that: The thickness of the liquid crystal cell is between 3.5 μm and 4.0 μm; The optical path difference Δnd of the liquid crystal cell is between 0.30 and 0.

32.

6. The vertically aligned passive segmented liquid crystal display with no viewing angle blind zone according to claim 1, characterized in that: The first box wall further includes an upper glass substrate, and the upper glass substrate is arranged on a side of the upper ITO electrode layer away from the upper PI layer.

7. The vertically aligned passive segmented liquid crystal display with no viewing angle blind zone according to claim 1, characterized in that: The second box wall further includes a lower glass substrate, and the lower glass substrate is arranged on a side of the lower ITO electrode layer away from the lower PI layer.

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