JP4835227B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device.

  Mobile information devices such as mobile phones are transflective LCDs that allow both reflective display using external light and transmissive display using a backlight so that a good display can be obtained even under strong external light or in a dark indoor environment. Display devices have been developed. For example, a transflective liquid crystal display with a multi-gap structure in which protrusions are formed on an array substrate or a color filter substrate so that the gap in the reflective region is about half the gap in the transmissive region (the gap between the substrates) Apparatus. In this case, a protrusion formed in the reflective region for each pixel (see Patent Document 1 and FIG. 7) or a protrusion formed of a transparent resin or the like is continued over adjacent pixels without being separated for each pixel. In addition, the protrusions are formed in a stripe shape connected to both ends of the display portion, or in the form of a full surface continuous to all pixels (in this case, the transmissive region is an isolated groove shape for each pixel) (non-patent document) 1 and FIGS. 1 to 5 and Photo 1).

JP 2005-115275 A Koichi Fujimori, Yozo Naruto, Naofumi Kimura: “High Transmission Advanced TFT-LCD Technology”, Sharp Technical Report, No. 85, p34-37 (2003)

  In a conventional transflective liquid crystal display device, when a protrusion is formed in each reflective area, a large step of about 1.5 to 3 μm corresponding to about half of the gap in the transmissive area is provided for each pixel. It is formed. Due to the large level difference caused by the protrusions, the rubbing process for performing liquid crystal alignment becomes insufficient, and liquid crystal alignment defects are likely to occur. This liquid crystal alignment defect region has a problem in that light leaks during black display, which causes black to float and the contrast ratio to decrease.

  On the other hand, when the protrusions are continuous over adjacent pixels and the protrusions are formed in stripes connected to both ends of the display part, or in the form of a solid surface continuous to all pixels, the protrusions with a small gap are long or wide. Continuous in area. Usually, the resistance when a gas or liquid flows is inversely proportional to the cross-sectional area of the flowing path. For this reason, the residual gas and the liquid crystal are less likely to flow due to the protrusion when the liquid crystal is injected, and bubbles that are portions where the liquid crystal is not injected after the liquid crystal is injected are likely to be generated. There is a problem that a pixel in which the bubble is generated becomes a defective pixel. Further, in the vacuum liquid crystal injection method in which the liquid crystal injection port is provided on one side of the panel, there is a problem in productivity that the exhaust time of the residual gas in the panel from the liquid crystal injection port and the liquid crystal injection time become long.

  The present invention has been made to solve the above-described problems, and provides a liquid crystal display device having a multi-gap structure with excellent display quality by reducing the occurrence of liquid crystal alignment defects and bubbles. With the goal.

The liquid crystal display device according to the present invention includes a pixel having a first display area that is a transmissive area and a second display area that is a reflective area provided with a protrusion that forms a gap smaller than the first display area. in the liquid crystal display device having a display unit formed by arranging in a matrix between a pair of substrates, protrusions, as well as continuous within one pixel, continuous over between a plurality of pixels arranged in one direction, this Each of the arranged pixels has a recess provided along a boundary portion of the pixels in a direction intersecting the arrangement direction of the arranged pixels .

According to the liquid crystal display device according to the present invention, it is possible to reduce the liquid crystal alignment defects and bubble generation, it is possible to obtain a liquid crystal display device with excellent multi-gap structure in display quality.

Embodiment 1 FIG.
Embodiments of the liquid crystal display device of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a pixel of the liquid crystal display device according to Embodiment 1 of the present invention. 2 and 3 are sectional views taken along lines II-II and III-III in FIG. 1, respectively. FIG. 4 is a plan view schematically showing the arrangement of the recesses of the liquid crystal display device according to Embodiment 1 of the present invention. In addition, the same code | symbol in a figure shows the same or an equivalent part.

  The liquid crystal display device of the present invention includes a pair of array substrate 20 and color filter substrate 30, and a panel 50 composed of liquid crystal 15 sandwiched between the substrate and the like. Although not shown, a polarizing plate, a phase difference plate, and the like are attached to the panel 50 as in the prior art, and a backlight is disposed on the back of the panel 50.

In FIG. 1, a plurality of pixels 40R, 40G, and 40B arranged in a matrix that constitutes the display unit 45 of the liquid crystal display device include a transmissive region T that is a first display region, and a second display region. A reflection region R. Here, the upper side of the pixels 40R, 40G, and 40B is a transmission region T, and the lower side is a reflection region R. The ratio between the transmission region T and the reflection region R can be designed arbitrarily. The pixel electrode 6 provided on the array substrate 20 of the pixels 40R, 40G, and 40B includes a transmissive electrode 7 formed in the transmissive region T and a reflective electrode 8 formed in the reflective region R.
Here, the basic pixels 41 constituting the color display are three pixels 40R, 40G, and 40B composed of three colors of red, green, and blue (RGB). The basic pixels 41 are arranged in a matrix in the vertical and horizontal directions to constitute a display unit 45 capable of color display.

  On the color filter substrate 30, stripe-shaped protrusions 12 are formed in the reflection region R as indicated by diagonal lines in the drawing. The protrusion 12 is made of a photosensitive transparent resin. The protrusion 12 forms a step substantially corresponding to the difference in gap between the transmission region T and the reflection region R so that the gap is smaller in the reflection region R than in the transmission region T. Here, the protruding portion 12 does not have a continuous stripe shape up to both ends of the display portion 45, and a concave portion 16 having a groove width W is formed for each basic pixel 41 of the three pixels 40R, 40G, and 40B. The recess 16 is formed at the boundary between the pixel 40B and the pixel 40R between the adjacent basic pixels 41.

  In addition, light shielding films 10R, 10G, and 10B that shield light leakage between patterns and a liquid crystal alignment defect region are formed on the outer peripheral portions of the pixels 40R, 40G, and 40B, respectively. The light shielding films 10R, 10G, and 10B are made of chromium oxide, nickel oxide, or the like, but may be black resin or the like. The light shielding films 10R, 10G, and 10B are arranged so that the ends of the light shielding films 10R, 10G, and 10B are disposed about 3 to 8 μm inside the outer peripheral portion of the pixel electrode 6 in consideration of the overlay accuracy with the array substrate 20. Designed. For this reason, the aperture ratio is smaller than the area ratio of the pixel electrode 6.

  Here, the columnar spacers 14 made of a photosensitive resin for setting the gap dr of the reflection region R are formed only in the pixel 40G. Since a liquid crystal alignment defect occurs around the columnar spacer 14, the light shielding film 10G is also formed in this region. The arrangement position and the number of the columnar spacers 14 can be arbitrarily designed, and instead of the columnar spacers 14, a spray-type spherical spacer or the like may be used.

  Further, in the step region of the protrusion 12 and the recess 16, liquid crystal alignment defects are likely to occur. Therefore, it is preferable to provide the light shielding films 10R, 10G, and 10B. Here, the light shielding films 10R, 10G, and 10B are provided at the boundary portions of the pixels 40R, 40G, and 40B, respectively. For the step region of the projection 12 at the boundary between the transmission region T and the reflection region R in the pixel electrode 6, the light shielding films 10R, 10G, and 10B are not provided, and the step of the projection 12 is arranged in the reflection region R. did. This is because priority is given to the brightness of the display to avoid a decrease in the aperture ratio due to the light shielding films 10R, 10G, and 10B. This is because the contrast ratio in the reflective display is generally as low as 50: 1 or less, and black floating due to some liquid crystal alignment failure in the reflective region R is difficult to be visually recognized as a decrease in the contrast ratio in the reflective display.

  Next, the details of the cross-sectional configuration of the pixels 40R, 40G, and 40B will be described with reference to FIGS. The array substrate 20 includes a transparent substrate 1 such as glass, a gate wiring 2 that supplies a scanning signal, a switching element 3 such as a thin film transistor (TFT) or a thin film diode (TFD) that is turned on / off by a signal from the gate wiring 2, It includes an interlayer insulating film 4 that prevents a short circuit between electrodes and wiring, a source wiring 5 that supplies a video signal, a pixel electrode 6 that is connected to the switch element 3 and applies a voltage to the liquid crystal 15. The pixel electrode 6 includes a transmissive electrode 7 and a reflective electrode 8. The transmissive electrode 7 is made of a transparent conductive film having a thickness of about 80 nm such as ITO or SnO2, and the reflective electrode 8 is made of a metal film having a thickness of about 100 to 200 nm such as aluminum or silver having a high reflectivity or a laminated film thereof. .

  The color filter substrate 30 is a photosensitive substrate that forms a transparent substrate 9 such as glass, light shielding films 10R, 10G, and 10B having a film thickness of about 150 nm, RGB color filters 11R, 11G, and 11B, and a reflection region R. A protrusion 12 made of a transparent resin, the like, a counter electrode (common electrode) 13 that is continuous across all the pixels 40R, 40G, and 40B made of a transparent conductive film such as ITO having a thickness of about 150 nm, a columnar spacer 14, and the like It is composed of

  The protrusion 12 is designed to have a film thickness such that the gap dr of the reflection region R is about ½ dt with respect to the gap dt of the transmission region T. The color filters 11R, 11G, and 11B and the protrusions 12 may be formed in the order of the color filters 11R, 11G, and 11B after the protrusions 12 are formed. , 11B has a tendency to be flattened, so that consideration is necessary. Further, a protective film made of a transparent resin may be formed on the entire surface of the color filters 11R, 11G, and 11B separately from the protrusions 12.

  The film thickness of the color filters 11R, 11G, and 11B is generally set to about 0.5 to 3.5 μm. Here, the RGB pixels 40R, 40G, and 40B have the same film thickness, and the transmission film T and the reflection film R have the same film thickness, which is about 1.2 μm. By changing the film thickness of the color filters 11R, 11G, and 11B in the transmissive region T and the reflective region R, or by not arranging the color filters 11R, 11G, and 11B in a part of the reflective region R, the reflectance can be improved and the color reproduction range. May be optimized. Further, the color reproduction range may be optimized by setting the color filters 11R, 11G, and 11B to different film thicknesses.

  The film thickness of the columnar spacer 14 is adjusted according to the material constituting the array substrate 20 and the underlying material of the color filter substrate 30. Further, the columnar spacers 14 may be formed not on the color filter substrate 30 but on the array substrate 20.

  Here, the reflective electrode 8 is shown to be flat for simplification of the process, but the reflective region R needs to have a scattering function in order to perform white display. Separately, a scattering film in which fine particles are dispersed is used as a color filter. Affixed to the substrate 30. Fine particles may be dispersed in the transparent resin of the color filters 11R, 11G, 11B or the protrusions 12 to have a scattering function. In general, the reflective electrode 8 is formed in a concavo-convex shape so as to have a scattering function.

  Although not shown, generally, a storage capacitor portion for holding a voltage is formed below the pixel electrode 6 in the array substrate 20. In addition, an alignment film made of polyimide or the like for liquid crystal alignment is formed on the uppermost layer of the array substrate 20 and the color filter substrate 30, and a rubbing process is performed in the direction of liquid crystal alignment.

  Next, the details of the recess 16 provided in the protrusion 12 which is the main part of the present invention will be described. The protrusion 12 is made of a photosensitive transparent resin, and is applied to a desired film thickness by spin coating or the like, and is exposed and developed. Here, the gap dr of the reflection region R is designed to be 2.0 μm while the gap dt of the transmission region T is 3.8 μm, and the film thickness of the protrusion 12 is set to 1.8 μm.

  As shown in FIGS. 1 and 3, the stripe-shaped protrusions 12 are not continuous to both ends of the display unit 45, and are separated for each basic pixel 41 including three RGB pixels 40 </ b> R, 40 </ b> G, and 40 </ b> B. In addition, a recess 16 is formed. Further, the recess 16 is a communication groove having both ends open. The recess 16 is formed at the boundary between the pixel 40B and the pixel 40R between the adjacent basic pixels 41, and is provided in the region of the light shielding film 10B corresponding to the position of the source wiring 5. Here, the widths of the light shielding films 10R, 10G, and 10B are the same, and the groove width W of the concave portion 16 is made smaller than the width of the light shielding film 10B corresponding to the position of the source wiring 5, so The rate change has been eliminated.

  The recess 16 is formed at the same time by using a mask pattern that does not form the projection 12 similar to the transmission region T in the step of forming the projection 12 of the reflection region R. Therefore, the gap ds of the concave portion 16 is substantially equal to the gap dt of the transmissive region R.

  Further, if the color filter 11B corresponding to the position of the recess 16 is not partially disposed, a wider gap ds can be formed by the film thickness of the color filter 11B.

  Since the protrusion 12 is continuous for each basic pixel 41 including three pixels 40R, 40G, and 40B in the row (lateral) direction of the display unit 45, the area and the number of the recesses 16 in the direction include the pixels 40R, It is about 1/3 of that provided for each 40G and 40B. Therefore, it is possible to reduce the occurrence of liquid crystal alignment defects that are likely to occur at large steps in the recess 16.

  Here, as in the first embodiment, when the structure of the pixels 40R, 40G, and 40B does not change the aperture ratio depending on the presence or absence of the recess 16, the arrangement of the recess 16 may be any pixel 40R, 40G, or 40B. It can be provided for each of a plurality of arbitrary pixels.

  On the other hand, when the aperture ratio changes depending on the presence or absence of the recess 16 in the structure of the pixels 40R, 40G, and 40B, the recess 16 may be provided for each basic pixel 41 constituting the color display. When viewed in units of basic pixels 41, since all the basic pixels 41 have the same configuration, normal color display can be performed.

  For example, the width of the light shielding films 10R and 10G in the position where there is no recess 16 in the reflection region R is smaller than the width of the light shielding film 10B in the position where there is the recess 16, although there is a restriction such as the minimum line width. Can do. In this case, if the area of the reflective electrode 8 of the pixels 30R and 30G is increased, the aperture ratio of the reflective region R of the pixels 30R and 30G can be larger than 30B. Therefore, when viewed in units of basic pixels 41, the aperture ratio can be increased.

  Next, based on FIG. 4, the operation of the recess 16 formed in the protrusion 12 in the liquid crystal injection process will be described. Outside the display portion 45, a seal portion 17 such as a thermosetting or ultraviolet curable resin for bonding the array substrate 20 and the color filter substrate 30 is provided. Here, the liquid crystal injection port 18 that is not partially provided with the seal portion 17 is provided on one side of the panel 50 in the formation direction of the recess 16. In the case of the vacuum liquid crystal injection method, after the residual gas inside the panel 50 is evacuated from the liquid crystal injection port 18, the liquid crystal injection port 18 is immersed in the liquid crystal 15 and the liquid crystal 15 is injected into the panel with a differential pressure from the atmospheric pressure. . Thereafter, the liquid crystal injection port 18 is sealed with an ultraviolet curable resin or the like. On the other hand, in the case of the dropping liquid crystal injection method, since the liquid crystal 15 is dropped on several places of the display unit 45 inside the seal unit 17, the whole is evacuated and the array substrate 20 and the color filter substrate 30 are bonded together. The liquid crystal injection port 18 need not be provided.

  In the reflection region R where the projections 12 are formed, the gap dr is as small as about 2.0 μm. Therefore, in this region, the resistance when gas or liquid flows is large, but the projections 12 continue to both ends of the display unit 45. In addition, a recess 16 is provided for each basic pixel 41. Therefore, if a gas or liquid flows a little, it will continue to the both ends of the display part 45, the transmission area T with a gap dt as large as 3.8 micrometers, and the recessed part 16 of the gap ds substantially equal to the gap dt for every basic pixel 41 will exist. To do. Since the transmission region T and the concave portion 16 function as a communication groove having a low resistance, gas and liquid can easily flow in the row (horizontal) direction and the column (vertical) direction of the display unit 45. Therefore, since the residual gas and the liquid crystal 15 are less likely to stay in the display unit 45, bubbles are not generated after the liquid crystal is injected.

  Further, here, the liquid crystal injection port 18 is provided on one side of the panel 50 in the formation direction of the recess 16, and the recess 16 communicates linearly via the transmission region T. Gas and liquid can easily flow between the opposing seal portions 17. In particular, in the vacuum liquid crystal injection method, the conventional structure in which the residual gas exhaust time inside the panel 50 from the liquid crystal injection port 18 and the liquid crystal injection time are continuous to the both ends of the display unit 45 without the recess 16. Can be performed in a shorter time.

  In the first embodiment, the concave portion 16 is shown in the case where the protruding portion 12 is completely separated for each basic pixel 41, but the protruding portion 12 may not be completely separated by the concave portion 16. For example, the recess 16 may have a gap ds that is about 0.5 to 1.5 μm larger than the gap dr of the reflection region R, and the recess 16 smaller than the film thickness of the protrusion 12 has the effect of the present invention. Such a structure of the recess 16 can be formed, for example, by partially leaving the film thickness of the protrusion 12 on the bottom of the recess 16 using a halftone mask in the exposure process of the protrusion 12.

  Moreover, although the recessed part 16 showed the communicating groove | channel with which both ends were open | released, the effect of this invention is also applicable to the structure where the one end of the recessed part 16 is blocked | closed and the protrusion part 12 is not separated completely, but is continuous. Have However, from the viewpoint of reducing the resistance to flow of gas or liquid, the recess 16 is preferably a communication groove having both ends open.

  Normally, the larger the cross-sectional area that is the product of the gap ds and the groove width W in the recess 16, the smaller the resistance when the gas or liquid flows, but if the step of the recess 16 is increased to increase the gap ds, the liquid crystal is increased. Orientation defects are likely to occur. On the other hand, when the groove width W is large, it is necessary to increase the width of the light shielding film 10B in order to hide the liquid crystal alignment defect region due to the step of the concave portion 16, so that the aperture ratio decreases. Therefore, it is desirable that the step of the recess 16 and the groove width W be small as long as no bubble is generated in the liquid crystal injection process and the process time is allowed. In addition, when there is no change in the aperture ratio depending on the presence or absence of the concave portion 16, it may be provided for each of a plurality of pixels larger than the basic pixel 41 so that the number of the concave portions 16 is reduced.

  As described above, according to the first embodiment, it is possible to obtain a liquid crystal display device having a multi-gap structure in which liquid crystal alignment defects are reduced and bubbles are not generated.

Embodiment 2. FIG.
FIG. 5 is a plan view showing a pixel of the liquid crystal display device according to Embodiment 2 of the present invention. 6 and 7 are sectional views taken along lines VI-VI and VII-VII in FIG. 5, respectively. In addition, the same code | symbol in a figure shows the same or an equivalent part.

  The plan view of FIG. 5 is basically the same as FIG. In the first embodiment, the protrusion 12 is provided on the color filter substrate 30, but the second embodiment is different in that it is formed on the array substrate 20. As shown in FIGS. 6 and 7, the protrusion 12 is formed of a photosensitive resin or the like on the interlayer insulating film 4, and has a film thickness such that the gap dr of the reflection region R is, for example, 2.0 μm. It is formed with. In addition, a large number of projections and depressions are provided on the upper portion of the protrusion 12 so that the reflective electrode 8 has a scattering function. This concavo-convex structure can be formed at the same time as the protrusion 12 using a halftone mask, for example. As described above, when the projections 12 are provided on the array substrate 20, the upper part of the projections 12 may be flat. However, since the reflective electrode 8 has a scattering function by using a concavo-convex structure, the scattering film can be eliminated. .

  As shown in FIGS. 5 and 7, the stripe-shaped protrusions 12 are not continuous to both ends of the display unit 45, and are recessed so as to be separated for each basic pixel 41 including the three pixels 40R, 40G, and 40B. 16 is formed. The concave portion 16 is formed in the boundary portion between the pixel 40B and the pixel 40R between the adjacent basic pixels 41, and is provided in a region of the light shielding film 10B corresponding to the position of the source line 5 that does not contribute to display. Here, the widths of the light shielding films 10R, 10G, and 10B are the same, and the groove width W of the concave portion 16 is made smaller than the width of the light shielding film 10B, so that the change in the aperture ratio due to the presence or absence of the concave portion 16 is eliminated.

  In addition, since the protrusion 12, which is a thick insulating film, is formed on the gate wiring 2, the switch element 3, and the source wiring 5, the reflective electrode 8 is overlapped with part of the gate wiring 2, the switch element 3, and the source wiring 5. It can also be formed. In this case, the area of the reflective electrode 8 can be further increased without substantially increasing the parasitic capacitance.

  The concave portion 16 is formed at the same time by using a mask pattern that does not form the protruding portion 12 in the step of forming the protruding portion 12 of the reflective region R as in the transmissive region T. Therefore, the gap ds of the concave portion 16 is substantially equal to the gap dt of the transmissive region R.

  Further, if the color filter 11B corresponding to the position of the recess 16 is not partially disposed, a wider gap ds can be formed by the film thickness of the color filter 11B.

  As described above, even if the protrusions 12 and the recesses 16 are provided on the array substrate 20, the gap has the same configuration as in the first embodiment, and thus the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG.
FIG. 8 is a plan view showing a pixel of the liquid crystal display device according to Embodiment 3 of the present invention. 9 and 10 are cross-sectional views taken along lines IX-IX and XX in FIG. 8, respectively. In addition, the same code | symbol in a figure shows the same or an equivalent part.

  The plan view of FIG. 8 is basically the same as FIG. 1 and FIG. In the first and second embodiments, the protrusions 12 are provided on either the array substrate 20 or the color filter substrate 30. However, as shown in FIGS. 9 and 10, the protrusions 12a and 12b are provided in the third embodiment. A step substantially corresponding to the gap difference dt-dr between the transmission region T and the reflection region R is divided and formed on both. With such a configuration, even if the gap dr of the same reflection region R is formed, the step between the projection 12a of the array substrate 20 and the projection 12b of the color filter substrate 30 can be reduced. Therefore, it is possible to further reduce the occurrence of liquid crystal alignment defects due to the steps of the protrusions 12a and 12b.

As shown in FIGS. 8 and 10, the stripe-shaped protrusions 12a and 12b are not continuous to both ends of the display unit 45, and are separated for each basic pixel 41 including the three pixels 40R, 40G, and 40B. The recesses 16 a and 16 b are formed separately on both the array substrate 20 and the color filter substrate 30. Further, the recesses 16a and 16b are formed at the boundary between the pixel 40B and the pixel 40R between the adjacent basic pixels 41, and are provided in a region of the light shielding film 10B corresponding to the position of the source line 5 that does not contribute to display. . Here, the widths of the light-shielding films 10R, 10G, and 10B are the same, and the groove width W of the recesses 16a and 16b is made smaller than the width of the light-shielding film 10B to eliminate the change in the aperture ratio due to the presence or absence of the recesses 16a and 16b. ing.
With such a configuration, the step between the concave portion 16a of the array substrate 20 and the concave portion 16b of the color filter substrate 30 can be reduced. Therefore, the occurrence of liquid crystal alignment defects due to the steps of the recesses 16a and 16b can be further reduced.

  The recesses 16a and 16b may be provided only on either the array substrate 20 or the color filter substrate 30. Further, here, the recesses 16 a and 16 b are arranged at the same position facing each other, but the array substrate 20 and the color filter substrate 30 may be arranged at different positions.

As described above, even when the protrusions 12a and 12b and the recesses 16a and 16b are provided on both the array substrate 20 and the color filter substrate 30, the gap has the same configuration as that of the first embodiment. 1 can be obtained.
Further, since the protrusions 12a and 12b and the recesses 16a and 16b are formed separately, the step on the array substrate 20 and the color filter substrate 30 is reduced, and the occurrence of liquid crystal alignment defects can be further reduced.

Embodiment 4 FIG.
FIG. 11 is a plan view schematically showing the arrangement of the recesses 16 of the liquid crystal display device according to Embodiment 4 of the present invention. In the first to third embodiments, the recess 16 formed in the protrusion 12 is provided for each basic pixel 41 of the three pixels 40R, 40G, and 40B, and is provided at the boundary between the pixels 40B and 40R between the adjacent basic pixels 41. It was. In the fourth embodiment, as shown in FIG. 11, the recess 16 is provided for each of the basic pixels 41 of the three pixels 40R, 40G, and 40B, but the pixels 40R, 40G, and 40B arranged in a matrix of the display unit 45. For each row (horizontal), the color configuration in which the concave portion 16 is provided is changed to sequentially change to the boundary between the pixel 40B and the pixel 40R, the pixel 40R and the pixel 40G, and the pixel 40G and the pixel 40B.

In this way, by changing the color configuration of the pixels 40R, 40G, and 40B in which the recesses 16 are provided for each row (horizontal), the communication grooves that are the recesses 16 are not only linear, but also have an arbitrary shape such as a staircase or a staggered pattern. Even in such a configuration, the flow of gas or liquid is facilitated. Therefore, no bubbles are generated in the liquid crystal 15, and the same effect as in the first embodiment can be obtained.
Further, in the display unit 45, a plurality of pixel units provided with the recesses 16 may be changed. For example, an arrangement in which the recesses 16 near the liquid crystal injection port 18 are larger than other positions, or an arrangement in which the recesses 16 are radially formed around the liquid crystal injection port 18, or a panel from the liquid crystal injection port 18 is possible. The residual gas exhausting time inside 50 and the liquid crystal injection time can be performed in a short time.

Embodiment 5 FIG.
FIG. 12 is a plan view showing a pixel of the liquid crystal display device according to Embodiment 5 of the present invention. 13 and 14 are sectional views taken along lines XIII-XIII and XIV-XIV in FIG. 12, respectively. FIG. 15 is a plan view schematically showing the arrangement of the recesses in the liquid crystal display device according to Embodiment 5 of the present invention. In addition, the same code | symbol in a figure shows the same or an equivalent part.

  In the first to fourth embodiments, the transmissive region T and the reflective region R are arranged in parallel above and below the pixels 40R, 40G, and 40B, and the protrusions 12 are shown in a stripe shape, but in the fifth embodiment, As shown in FIG. 12, the transmission region T is disposed so as to be surrounded by the reflection region R. The aperture ratio of the transmissive region T is the same for the pixels 40R, 40G, and 40B, but the aperture ratio of the reflective region R is different for the pixels 40R, 40G, and 40B. Due to the presence of the columnar spacer 14 in the pixel 40G and the presence of the recess 16 in the pixel 40B, the width of the light shielding films 10G and 10B corresponding to the respective positions is increased, and the aperture ratio of the reflection region R of the pixels 40G and 40B is , Smaller than the pixel 40R.

  The protrusion 12 was formed on the array substrate 20 as shown in FIGS. 13 and 14. Further, unevenness is formed on the upper portion of the protrusion 12. The protrusion 12 is not continuous over the entire display unit 45, and the recess 16 is provided for each basic pixel 41 including the pixels 40R, 40G, and 40B. The recess 16 is formed at the boundary between the pixels 40 </ b> B and 40 </ b> R between the adjacent basic pixels 41, and is disposed in the region of the light shielding film 10 </ b> B corresponding to the position of the source wiring 5. Further, the recess 16 is a continuous communication groove extending over the entire pixel 40B in the column (vertical) direction. The width of the light shielding film 10B corresponding to the position of the concave portion 16 is wider than the width of the light shielding films 10R and 10G of the other pixels 40R and 40G in order to hide the liquid crystal alignment defect region due to the concave portion 16.

  Next, based on FIG. 15, the operation of the recess 16 formed in the protrusion 12 in the liquid crystal injection process will be described. A recess 16 is provided in the protrusion 12 for each basic pixel 41, and the recess 16 forms a communication groove linearly across both ends of the display unit 45 in the column (vertical) direction. In addition, a liquid crystal injection port 18 is provided on one side of the panel 50 in the formation direction of the recess 16. The gap ds of the recess 16 is substantially equal to the gap dt of the transmission region T, and the resistance of the flow of gas and liquid is lower than that of the reflection region R. Therefore, the recess 16 facilitates the flow of gas and liquid in the panel 50. ing. In particular, since the flow of gas or liquid is facilitated by the communication groove that is the recess 16 between the liquid crystal injection port 18 and the seal portion 17 on one side facing the liquid crystal injection port 18, the liquid crystal injection port 18 is used in the vacuum liquid crystal injection method. The time for exhausting the residual gas inside the panel 50 and the time for injecting the liquid crystal can be performed in a shorter time than a configuration in which the projections 12 are continuous over the entire display unit 45 without the recesses 16. Therefore, the same effect as in the first embodiment can be obtained.

  In addition, although the case where the recessed part 16 was provided in the row | line | column (vertical) direction of the display part 45 was shown, it may be provided in a row (horizontal) direction, may be provided in both, and when gas or a liquid flows By providing the recess 16 having a low resistance for each of the plurality of pixels, the same effect as in the first embodiment can be obtained.

  As described above, in Embodiments 1 to 5 described above, the basic pixel 41 constituting the color display is configured by the RGB three-color pixels 40R, 40G, and 40B. However, the three colors are not limited to RGB. Yellow, magenta, and cyan (YMC) pixels 40Y, 40M, and 40C may be used. Further, the configuration of the basic pixels 41 of 4 to 6 colors that can improve the color reproduction range is not limited to three colors.

  Further, the arrangement of the transmissive region T and the reflective region R may be divided on the left and right of the pixels 40R, 40G, and 40B, respectively. In this case, since the protrusions 12 are continuous in the column (vertical) direction of the display unit 45, the same effect can be obtained by providing the recesses 16 for each of the pixels 40R, 40G, and 40B in a plurality of rows. A plurality of transmission regions T and reflection regions R may be provided in each of the pixels 40R, 40G, and 40B.

It is a top view which shows the pixel of the liquid crystal display device in Embodiment 1 of this invention. It is sectional drawing which shows the pixel of the liquid crystal display device in Embodiment 1 of this invention. It is sectional drawing which shows the pixel of the liquid crystal display device in Embodiment 1 of this invention. It is a top view which shows typically arrangement | positioning of the recessed part of the liquid crystal display device in Embodiment 1 of this invention. It is a top view which shows the pixel of the liquid crystal display device in Embodiment 2 of this invention. It is sectional drawing which shows the pixel of the liquid crystal display device in Embodiment 2 of this invention. It is sectional drawing which shows the pixel of the liquid crystal display device in Embodiment 2 of this invention. It is a top view which shows the pixel of the liquid crystal display device in Embodiment 3 of this invention. It is sectional drawing which shows the pixel of the liquid crystal display device in Embodiment 3 of this invention. It is sectional drawing which shows the pixel of the liquid crystal display device in Embodiment 3 of this invention. It is a top view which shows typically arrangement | positioning of the recessed part of the liquid crystal display device in Embodiment 4 of this invention. It is a top view which shows the pixel of the liquid crystal display device in Embodiment 5 of this invention. It is sectional drawing which shows the pixel of the liquid crystal display device in Embodiment 5 of this invention. It is sectional drawing which shows the pixel of the liquid crystal display device in Embodiment 5 of this invention. It is a top view which shows typically arrangement | positioning of the recessed part of the liquid crystal display device in Embodiment 5 of this invention.

Explanation of symbols

6 Pixel electrode 7 Transmission electrode 8 Reflection electrode 12, 12a, 12b Protrusion 15 Liquid crystal 16, 16a, 16b Recess 18 Liquid crystal injection port 20 Array substrate 30 Color filter substrate 40R, 40G, 40B Pixel 41 Basic pixel 45 Display unit 50 Panel T Transmission region R Reflection region dt, dr, ds Gap

Claims (9)

A pixel having a first display area which is a transmissive area and a second display area which is a reflective area provided with a projection that forms a gap smaller than the first display area is arranged in a matrix between a pair of substrates. a plurality of pixels in a liquid crystal display device having a display unit formed by arranging the protrusions with continuously in one said pixel, continuous over between a plurality of the pixels arranged in one direction, that this sequence A liquid crystal display device having a concave portion provided along a boundary portion of the pixels in a direction intersecting with the arrangement direction of each of the arranged pixels . One of the pair of substrates is provided with a switch element and a pixel electrode connected to the switch element for applying a voltage to the liquid crystal. The pixel electrode includes a transmissive electrode and a reflective electrode, and the reflective region is formed of a reflective electrode. The liquid crystal display device according to claim 1, wherein the liquid crystal display device corresponds to a portion. 3. The liquid crystal display device according to claim 1, wherein a boundary between the reflection region and the transmission region where the protrusion is provided in one pixel is formed by a single straight line without bending. A columnar spacer that sets a gap in the second display area, which is a reflection area between the pair of substrates, is formed in the second display area on the protrusion without extending between adjacent pixels. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device. The liquid crystal display device according to claim 4, wherein the columnar spacer is formed only on a green pixel. The liquid crystal display device according to claim 1 , wherein the concave portion is formed for each basic pixel constituting a color display. Recess, a liquid crystal display device according to any one of claims 1 to 6, characterized in that both ends are communicating open groove. On one side in the concave portion forming direction, the liquid crystal display device according to any one of claims 1 to 7, characterized in that with a liquid crystal inlet. The liquid crystal display device according to claim 8, wherein the number of concave portions provided in the protrusion is arranged so as to be greater in the vicinity of the liquid crystal injection port than in other positions.

Images