JP2002014334A5 - - Google Patents

Description

[0012]
[Means for solving problems]
In order to achieve the above object, the liquid crystal display according to the present invention is between a first transparent electrode formed on the side of the first substrate and a second transparent electrode formed on the side of the second substrate. The first and second transparent electrodes form a pixel region in which the first and second transparent electrodes overlap each other when viewed in plan, and the reflective film that reflects the light incident from the first substrate side is the first. A liquid crystal device formed on the surface of the substrate 2 on the liquid crystal layer side and provided with a light-shielding film formed by laminating a plurality of colored layers on the reflective film, wherein the reflective film is colored. The entire surface is covered with the layer, and the light-shielding film has an opening region in which the colored layer of any one of a plurality of colors is arranged corresponding to the pixel region, and the opening region is the pixel. It is characterized by being wide outside the area.
Further, in the liquid crystal display according to the present invention, the opening region of the light-shielding film is limited to approximately half of the distance between the first and second transparent electrodes from the end of the pixel region with respect to the pixel region. It is characterized in that it is widened to the outside of the pixel area.
Further, the liquid crystal display according to the present invention is characterized in that the reflective film is arranged at a position corresponding to a region widened outside the pixel electrode in the opening region of the light-shielding film.
Further, the liquid crystal device according to the present invention is characterized in that, in the opening region of the light-shielding film, a region wide outside the pixel region is a region in which liquid crystal molecules are driven by an oblique electric field.
Further, in the liquid crystal device according to the present invention, the pixel region is a rectangular region, and the opening region of the light-shielding film is a side orthogonal to the director direction of the liquid crystal molecule in the liquid crystal layer with respect to the pixel region. On the one hand, the length d ₁ is narrowed inside the pixel region, and on the other side, the length d ₂ is widened outside the pixel region.
Further, in the liquid crystal device according to the present invention, in the opening region of the light-shielding film, a region widened outside the pixel region by the length d ₂ is a region in which liquid crystal molecules are driven by an oblique electric field. _The region narrowed inside the pixel region by the length d1 in the opening region of the light-shielding film is characterized in that the liquid crystal molecules are not driven by the oblique electric field.
Further, in the liquid crystal display according to the present invention, the length of the pixel region is represented by L1, the width of the pixel region is represented by W1, and the distance between the _first and _second transparent electrodes is represented by d. When, the length d ₁ is a value approximately equal to or less than the distance d, the length d ₂ is a value approximately ½ or less of the distance d, and the length L of the opening region of the light-shielding film. ₂ and width W ₂ are, respectively.
L 1-2d ₁ ≤ L ₂ ≤ L ₁ + _{2d 2}
W 1-2d ₁ ≤ W ₂ ≤ W ₁ + _{2d 2}
It is characterized by being within the range of.
Further, the liquid crystal display according to the present invention is characterized by having a first opening in the opening region of the light-shielding film and transmitting light through the reflective film.
Further, the liquid crystal apparatus according to the present invention is characterized in that a first film is further provided between the reflective film and the surface of the second substrate on the liquid crystal layer side.
Further, the liquid crystal display according to the present invention is further provided with a second film that covers at least the surface of the reflective film.
Further, the electronic device of the present invention is characterized by including the liquid crystal device according to any one of the above.

0013
According to the first invention, since the liquid crystal layer is sandwiched by the first and second transparent electrodes of the same type, the display quality and long-term reliability of the liquid crystal device are not deteriorated. Further, since the light-shielding film and the colored layer are formed on the reflective film, it is possible to prevent the reflective film from being exposed. Therefore, in the manufacturing process of the liquid crystal device, the reflective film can be prevented from being exposed to a chemical solution, a gas, a liquid crystal layer, or the like, and damage to the reflective film can be suppressed.

[0017]
According to the first invention, it is not necessary to provide a separate layer as a light-shielding film, so that it is possible to reduce the cost. Since the colored layer of a general reflective liquid crystal device is lighter than the density of the colored layer of a transmissive display device, the optical density may be 1 or less even if two or more colored layers are laminated. It is difficult to obtain the required optical density. On the other hand, in this configuration, in the reflective display, the light passes through the light-shielding film in which two or more colored layers are laminated twice, and in the transmissive display, the light is the first opening of the reflective film. Since it is defined by the part, sufficient light-shielding property can be obtained even if a light colored layer is used. For example, when having three colored layers of R (red), G (green), and B (blue), if the optical density when these three colored layers are laminated is 0.7, the light is 2 Since the actual optical density after passing through the light is about 1.4, a reflective liquid crystal device having a contrast ratio of 1:25 or less generally has sufficient light-shielding property for practical use.

Claims (11)

A liquid crystal layer is sandwiched between a first transparent electrode formed on the side of the first substrate and a second transparent electrode formed on the side of the second substrate, and the first and second transparent A reflective film is formed on the surface of the second substrate on the liquid crystal layer side, and the electrode constitutes an overlapping pixel area in plan view, and reflects light incident from the first substrate side. What is claimed is: 1. A liquid crystal device comprising a light shielding film formed by laminating colored layers of a plurality of colors on a film, the liquid crystal device comprising:
The reflective film is entirely covered with the colored layer, and the light shielding film has an opening region corresponding to the pixel region, in which any one of the plurality of colored layers is disposed. The liquid crystal device according to claim 1, wherein the opening area is wider outside the pixel area. The opening area of the light shielding film is wider than the pixel area outside the pixel area within a limit of about half the distance between the first and second transparent electrodes to the end of the pixel area. A liquid crystal device characterized in that 2. The liquid crystal device according to claim 1, wherein the reflective film is disposed at a position corresponding to a region which is wide outside the pixel electrode in the opening region of the light shielding film. 4. The image display apparatus according to claim 1, wherein in the opening area of the light shielding film, an area wide outside the pixel area is an area where liquid crystal molecules are driven by an oblique electric field. Liquid crystal devices. The pixel area is a rectangular area, and the opening area of the light shielding film is a length d ₁ on one side of the liquid crystal layer perpendicular to the director direction of liquid crystal molecules with respect to the pixel area. 5. The pixel according to any one of claims 1 to 4, characterized in that it is narrowed inside the pixel area, and is extended outside the pixel area by a length d ₂ on the other side. Liquid crystal device. In the opening area of the light shielding film, the area which is widened outside the pixel area by the length d ₂ is an area where liquid crystal molecules are driven by an oblique electric field,
The narrowed region on the inside of the opening the by the length d ₁ in the region of the pixel region of the light-shielding film, the liquid crystal device according to claim 5, characterized in that an area where liquid crystal molecules are not driven by an oblique electric field . Let L _{1 be} the length of the pixel area and W _{1 be} the width of the pixel area,
When the distance between the first and second transparent electrodes is represented by d,
The length d ₁ is a value substantially equal to or less than the distance d,
The length _{d 2} is approximately half or less of the value of the distance d,
The length L ₂ and the width W ₂ of the opening area of the light shielding film are respectively
L ₁ −2 d ₁ ≦ L ₂ ≦ L ₁ +2 d ₂
W _{1 − 2} d ₁ ≦ W ₂ ≦ W ₁ + ₂ d ₂
The liquid crystal device according to any one of claims 4 or 5, wherein the liquid crystal device falls within the range of The liquid crystal device according to any one of claims 1 to 7, further comprising a first opening in the opening area of the light shielding film, wherein the reflection film transmits light. The liquid crystal device according to any one of claims 1 to 8, further comprising a first film between the reflective film and a surface of the second substrate on the liquid crystal layer side. The liquid crystal device according to any one of claims 1 to 9, further comprising a second film covering at least a surface of the reflective film. An electronic apparatus comprising the liquid crystal device according to any one of claims 1 to 10.