JP2007041626A - Transflective liquid crystal device and electronic apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transflective liquid crystal device capable of displaying an image with a sufficient light quantity when the liquid crystal apparatus is used even if a color filter for transmission display and a color filter for reflection display are formed in a pixel, and also to provide an electronic apparatus using the transflective liquid crystal device. <P>SOLUTION: In the counter substrate 20 of the transflective liquid crystal apparatus 100, the color filter 241 for transmission display having a wide chromaticity region and the color filter 242 for reflection display having a narrow chromaticity region are formed in a transmission display region 100c and a reflection display region 100b, respectively, on a lower layer side of a counter electrode 21. A boundary part 26 between the color filters 241 and 242 is made to be positioned in the reflection display region 100b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a transflective liquid crystal device and an electronic apparatus including the same. More specifically, the present invention relates to a pixel structure technique in which a transmissive display color filter and a reflective display color filter are formed in one pixel.

Among various types of liquid crystal devices, those capable of displaying images in both transmissive mode and reflective mode are called transflective liquid crystal devices and are used in every scene.

In this transflective liquid crystal device, for example, as schematically shown in FIG. 14A, a reflective display region 10 is provided in a pixel 100a partitioned by data lines 6a and scanning lines 3a.
0b and a rectangular window-shaped transmissive display region 100c are formed.

Among such transflective liquid crystal devices, a thin film transistor (hereinafter referred to as a TFT (Thin Film Transistor)) is used as a pixel switching element.
As shown in FIG. 14 (B), a pixel electrode 9a (first electrode transparent on the surface) is used.
TFT array substrate 10 (first transparent substrate) on which the pixel switching TFT 30 is formed, the counter electrode 21 (second transparent electrode), and the counter substrate 20 (on which the light shielding film 23 is formed) ( Second transparent substrate) and these substrates 10, 2
And a liquid crystal layer 50 held between zero. The gap between the TFT array substrate 10 and the counter substrate 20 is such that a gap material 5 having a predetermined particle diameter is spread on the surface of one of the substrates, and then the TFT array substrate 10 and the counter substrate 20 are sealed (not shown). It is prescribed by pasting together.

The TFT array substrate 10 includes a pixel 1 in which a pixel electrode 9a and a counter electrode 21 face each other.
The light reflection layer 8a constituting the reflection display region 100b is formed at 00, and the transmissive display region 10 is formed by the remaining region (light transmission window 8d) where the light reflection layer 8a is not formed.
0c is configured.

Accordingly, among the light emitted from the backlight device (not shown) arranged on the back side of the TFT array substrate 10, the light incident on the transmissive display region 100c is indicated by the arrow L.
As shown by B, the light enters the liquid crystal layer 50 from the TFT array substrate 101 side, is optically modulated by the liquid crystal layer 50, and then is emitted as transmissive display light from the counter substrate 20 side to display an image (transmission mode). ).

On the other hand, of the external light incident from the counter substrate 20 side, the reflective display region 10
The light incident on 0b reaches the reflective layer 8a through the liquid crystal layer 50 as shown by the arrow LA, is reflected by the reflective layer 8a, and again passes through the liquid crystal layer 50 to reflect from the counter substrate 20 side. It is emitted as light and displays an image (reflection mode).

In such a transflective liquid crystal device, if a color filter is formed on the counter substrate 20, color display can be performed in both the transmissive mode and the reflective mode. The reflected display light passes through the color filter twice, whereas it passes through and exits only once.
For this reason, the reflective display region 10 in which the light reflection film 8a is formed on the counter substrate 20 is provided.
In 0b, a reflective display color filter 242 having a narrow chromaticity region is formed, while in a transmissive display region 100c in which the transmissive window 8d is formed, a transmissive display color filter 242 having a wide chromaticity region is formed. Has been.

Here, the transmissive display color filter 241 and the reflective display color filter 242 are each formed by using a photolithography technique or the like, and when the boundary portion 26 has a gap, the display is performed in the transmissive mode. , The light leaks from there and the display quality deteriorates. Therefore, conventionally, the color filter 241 for transmissive display is used.
A light shielding film 230 is formed at a boundary portion 26 between the color filter 242 and the reflective display color filter 242.

  As a conventional example, there is a method described in JP-A-11-044814.

However, in the liquid crystal device, the amount of light that contributes to display is defined by the area of the region where display light can be emitted in the pixel 100a.
If the light shielding film 230 is formed so as to cover the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242, there is a problem in that the amount of display light is reduced correspondingly and a bright display cannot be performed.

In addition, as shown in FIG. 14A, the transmissive display area 100c is the reflective display area 1.
If the layout is surrounded by 00b, the color filter 241 for transmissive display is used.
Since the total length of the boundary portion 26 between the color filter 242 and the reflective display color filter 242 is long, the region where the light shielding film 230 is formed becomes long, and the amount of display light is significantly reduced.

Further, in the transflective liquid crystal device, the transmissive display light passes through the liquid crystal layer 50 and is emitted only once, whereas the reflective display light passes through the liquid crystal layer 50 twice. In both transmissive display light and reflective display light, it is difficult to optimize the retardation Δn · d. Accordingly, when the layer thickness d of the liquid crystal layer 50 is set so that the display in the reflection mode is good in visibility, the display in the transmission mode is sacrificed, while the display in the transmission mode is good in visibility. If the layer thickness d of the liquid crystal layer 50 is set so as to satisfy, there is a problem that display in the reflection mode is sacrificed.

In view of the above problems, an object of the present invention is to provide a semi-transparent display that can display an image with a sufficient amount of light even when a color filter for transmissive display and a color filter for reflective display are formed in a pixel. A reflective liquid crystal device and an electronic apparatus using the same are provided.

Another object of the present invention is to provide a transflective liquid crystal device capable of optimizing the retardation of the liquid crystal layer in both the transmissive display region and the reflective display region, and an electronic apparatus using the transflective liquid crystal device. is there.

In order to solve the above-described problems, in the present invention, a first transparent electrode and a first transparent substrate on which pixel switching elements are formed in a matrix form on the surface, and a pixel are configured to face the first transparent electrode. A second transparent substrate having a second transparent electrode formed on the surface, and a liquid crystal layer held between the first transparent substrate and the second transparent substrate. On the transparent substrate side, a partial area in the pixel is a reflective display area,
In the transflective liquid crystal device in which a light reflection layer having the remaining area as a transmissive display area is formed, a transmissive display color filter is formed in the transmissive display area on the second substrate, and the reflective display A reflective display color filter having a chromaticity range narrower than that of the transmissive display color filter is formed in the region, and a boundary portion between the transmissive display color filter and the reflective display color filter is on the reflective display region side. It is located in.

“Wide chromaticity range” in the specification of the present application refers to, for example, that the area of the color triangle represented by the CIE 1931 rgb color system chromaticity diagram is large, and corresponds to the fact that the hue is dark.

In the transflective liquid crystal device, display is performed only in the reflection mode in a standby state of a device on which the transflective liquid crystal device is mounted, and the backlight is turned on when in use, and display is performed in the transmission mode in addition to the reflection mode. Corresponding to such usage, in the present invention, the boundary portion between the color filter for transmissive display and the color filter for reflective display is arranged on the reflective display region side, so that the color filter for transmissive display is appropriate for the transmissive display region. Is formed. Therefore, when using a device that displays in transmissive mode even if there is an overlap of color filters or there is a gap between the color filters at the boundary between the color filter for transmissive display and the color filter for reflective display, the color filter There is no influence of the boundary part. Therefore, since it is not necessary to form a light-shielding film at the boundary between the transmissive display color filter and the reflective display color filter on the second transparent substrate, an image can be displayed with a sufficient amount of light.

In the present invention, the transmissive display color filter and the reflective display color filter may overlap at a boundary portion between the transmissive display color filter and the reflective display color filter.

In the present invention, a gap may be provided between the transmissive display color filter and the reflective display color filter at a boundary portion between the transmissive display color filter and the reflective display color filter. Even if there is a gap between the color filters at the boundary between the color filter for transmissive display and the color filter for reflective display, in the reflective display area, external light enters through the gap and exits through the gap without passing through the color filter. Since the amount of light that is generated is extremely small, the image quality is hardly affected.

In the present invention, the pixel has a substantially rectangular planar shape, and a boundary portion between the transmissive display area and the reflective display area extends linearly within the pixel, and three sides of the transmissive display area are It is preferable to overlap the three sides of the pixel. With this configuration, the boundary portion between the transmissive display color filter and the reflective display color filter can be shortened, so that the influence of the boundary portion can be suppressed.

In the present invention, it is preferable that a boundary portion between the transmissive display area and the reflective display area extends in parallel with a short side of the pixel. With this configuration, since the boundary portion between the transmissive display color filter and the reflective display color filter can be minimized, the influence of the boundary portion can be suppressed.

In the present invention, the reflective display color filter is formed thicker than the transmissive display color filter so that the liquid crystal layer in the reflective display region has a layer thickness of the liquid crystal layer in the transmissive display region. It is preferable that the thickness is smaller than the thickness. With this configuration, the thickness of the liquid crystal layer in the reflective display region can be made thinner than the thickness of the liquid crystal layer in the transmissive display region without adding a new layer. For this reason, the transmissive display light is emitted only once through the liquid crystal layer, whereas the transmissive display light and the reflective display light are transmitted even if the reflective display light passes through the liquid crystal layer twice. In both cases, the retardation Δn · d can be optimized.

In the present invention, on the surface side of at least one of the first transparent substrate and the second transparent substrate, the layer thickness of the liquid crystal layer in the reflective display region is set to the layer of the liquid crystal layer in the transmissive display region. It is preferable that a layer thickness adjusting layer that is thinner than the thickness is formed. With this configuration, the thickness of the liquid crystal layer in the reflective display region can be made thinner than the thickness of the liquid crystal layer in the transmissive display region, so that transmissive display light is emitted only once through the liquid crystal layer. The reflected display light is applied to the liquid crystal layer twice.
Even if it passes, the retardation Δn · d can be optimized in both the transmissive display light and the reflective display light.

In the present invention, the layer thickness adjusting layer is preferably a transparent layer formed on the second transparent substrate. If comprised in this way, even if it provides a layer thickness adjustment layer, exposure precision does not fall in the photolithography process for forming a pixel switching element in a 1st transparent substrate. Therefore, a transflective liquid crystal device with high reliability and high display quality can be provided.

In the present invention, as the layer thickness adjusting layer, for example, a configuration selectively formed in a region overlapping with the reflective display color filter can be employed. In this case, it is preferable that an end portion of the layer thickness adjusting layer is located in the reflective display region. With this configuration, even when the end of the layer thickness adjusting layer has a tapered surface and the layer thickness of the liquid crystal layer deviates from an appropriate value, such a misalignment may occur when displaying in the transmission mode. Does not affect the image quality.

In the present invention, the layer thickness adjusting layer may be configured to be thicker in the reflective display area and thinner in the transmissive display area than the reflective display area. In this case, it is preferable that the layer thickness adjusting layer has a boundary portion between a portion formed thick in the reflective display region and a portion formed thin in the transmissive display region in the reflective display region. . With this configuration, even if the thick part and thin part of the layer thickness adjusting layer have a tapered step, and the layer thickness of the liquid crystal layer deviates from an appropriate value, such a deviation is caused in the transmission mode. When displaying, the quality of the image is not affected.

In the present invention, at least one surface side of the first transparent substrate and the second transparent substrate protrudes from one substrate and comes into contact with the other substrate to thereby contact the first transparent substrate and the second transparent substrate. Preferably, columnar protrusions that define the distance between the substrate and the second transparent substrate are formed. Even if unevenness is formed on the first transparent substrate side or the second transparent substrate side by the thickness balance of the color filter or the formation of the layer thickness adjusting layer, the first transparent substrate side or the second transparent substrate. If the substrate spacing is controlled by the columnar protrusions formed on the side, there is no need to spray the gap material. For this reason, between the board | substrate and 2nd transparent board | substrate with a 1st transparent base material, the dispersion | variation in the board | substrate space | interval resulting from a gap material rolling into a recessed part among the unevenness | corrugations resulting from a layer thickness adjustment layer The retardation Δn · d can be maintained in an optimum state. Therefore, high quality display can be performed.

A liquid crystal device to which the present invention is applied can be used as a display device of an electronic device such as a mobile phone or a mobile computer.

Embodiments of the present invention will be described with reference to the drawings. In each drawing used in the following description, the scale is different for each layer and each member so that each layer and each member has a size that can be recognized on the drawing.

[Embodiment 1]
(Basic configuration of transflective liquid crystal device)
FIG. 1 is a plan view of a transflective liquid crystal device to which the present invention is applied as viewed from the side of a counter substrate together with each component, and FIG. 2 is a cross-sectional view taken along line HH ′ of FIG. FIG.
FIG. 6 is an equivalent circuit diagram of various elements, wirings, and the like in a plurality of pixels formed in a matrix in an image display region of a transflective liquid crystal device. Note that, in each drawing used in the description of the present embodiment, each layer and each member have different scales so that each layer and each member can be recognized on the drawing.

1 and 2, the transflective liquid crystal device 100 of this embodiment includes a TFT array substrate 10 (first transparent substrate) and a counter substrate 20 (second transparent substrate) bonded together by a sealing material 52. A liquid crystal layer 50 as an electro-optical material is held therebetween, and a peripheral parting 53 made of a light-shielding material is formed in an inner region of the region where the sealing material 52 is formed. A data line driving circuit 101 and a mounting terminal 102 are formed along one side of the TFT array substrate 10 in a region outside the sealing material 52, and the scanning line driving circuit 104 along two sides adjacent to the one side. Is formed. The remaining side of the TFT array substrate 10 is provided with a plurality of wirings 105 for connecting between the scanning line driving circuits 104 provided on both sides of the image display region, and further, under the peripheral parting line 53 and the like. In some cases, a precharge circuit or an inspection circuit is provided. Further, at least one corner portion of the counter substrate 20 is formed with a vertical conductive material 106 for electrical conduction between the TFT array substrate 10 and the counter substrate 20. Further, the data line driving circuit 101, the scanning line driving circuit 104, and the like may overlap with the seal material 52 or may be formed in an inner region of the seal material 52.

Instead of forming the data line driving circuit 101 and the scanning line driving circuit 104 on the TFT array substrate 10, for example, a TAB (in which a driving LSI is mounted)
(Tape automated, bonding) The substrate may be electrically and mechanically connected to a terminal group formed on the periphery of the TFT array substrate 10 through an anisotropic conductive film. In the transflective liquid crystal device 100, the type of the liquid crystal layer 50 to be used, that is, the TN (twisted nematic) mode, the STN (
A polarizing film, a retardation film, a polarizing plate, etc. are arranged in a predetermined direction depending on the operation mode such as the (Super TN) mode and the normally white mode / normally black mode. It is.

Further, since the transflective liquid crystal device 100 of this embodiment is for color display, each pixel electrode 9a of the TFT array substrate 10 is provided on the counter substrate 20 as will be described later.
A color filter of each color of R, G, and B is formed in a region opposite to.

In the screen display area of the transflective liquid crystal device 100 configured as described above,
As shown in FIG. 3, a plurality of pixels 100a are arranged in a matrix, and each of these pixels 100a has a pixel electrode 9a and the pixel electrode 9a.
TFT 30 for pixel switching is formed, and a data line 6a for supplying pixel signals S1, S2,... Sn is electrically connected to the source of the TFT 30. The pixel signals S1, S2,... Sn written to the data lines 6a may be supplied line-sequentially in this order, or may be supplied for each group to a plurality of adjacent data lines 6a. Good. Further, the scanning line 3a is electrically connected to the gate of the TFT 30, and the scanning signals G1, G2,... Gm are applied to the scanning line 3a in a pulse-sequential manner in this order at a predetermined timing. It is configured. The pixel electrode 9a is electrically connected to the drain of the TFT 30, and the pixel signals S1, S2,... Sn supplied from the data line 6a are turned on by turning on the TFT 30 as a switching element for a certain period. Are written in each pixel at a predetermined timing. Thus, the pixel signals S1, S2,... Sn at a predetermined level written to the liquid crystal through the pixel electrode 9a are held for a certain period with the counter electrode 21 of the counter substrate 20 shown in FIG. .

Here, the liquid crystal layer 50 modulates light and enables gradation display by changing the orientation and order of the molecular assembly according to the applied voltage level. In the normally white mode, the amount of incident light passing through the portion of the liquid crystal layer 50 is reduced according to the applied voltage. In the normally black mode, the incident light is changed according to the applied voltage. The amount of light passing through the portion of the liquid crystal layer 50 increases. As a result, light having a contrast according to the pixel signals S1, S2,... Sn is emitted from the transflective liquid crystal device 100 as a whole.

In order to prevent the retained pixel signals S1, S2,... Sn from leaking, the storage capacitor 60 is in parallel with the liquid crystal capacitor formed between the pixel electrode 9a and the counter electrode.
May be added. For example, the voltage of the pixel electrode 9a is held by the storage capacitor 60 for a time that is three orders of magnitude longer than the time when the source voltage is applied. This
The charge retention characteristics are improved, and the transflective liquid crystal device 100 having a high contrast ratio is provided.
Can be realized. As a method of forming the storage capacitor 60, as illustrated in FIG. 3, the storage capacitor 60 is formed between the storage capacitor 60 and the capacitor line 3b, which is a wiring for forming the storage capacitor 60, or with the previous scanning line 3a. Any of them may be formed between them.

(Configuration of TFT array substrate)
FIG. 4 is a plan view of a plurality of adjacent pixel groups of the TFT array substrate used in the transflective liquid crystal device of this embodiment. 5A and 5B are explanatory views schematically showing a state in which a reflective display region and a transmissive display region are formed in a pixel in a transflective liquid crystal device, and a part of the pixel is shown in FIG. It is sectional drawing when cut | disconnecting in the position corresponded to the CC 'line.

In FIG. 4, on the TFT array substrate 10, a plurality of transparent ITO (Indi
A pixel electrode 9a (first transparent electrode) made of a um Tin Oxide) film is formed in a matrix, and a pixel switching TFT 30 is connected to each pixel electrode 9a. A data line 6a, a scanning line 3a, and a capacitor line 3b are formed along the vertical and horizontal boundaries of the pixel electrode 9a.
The data line 6a and the scanning line 3a are connected. That is, the data line 6a
Is electrically connected to the high-concentration source region 1d of the TFT 30 through a contact hole, and the protruding portion of the scanning line 3a constitutes the gate electrode of the TFT 30.
The storage capacitor 60 has a structure in which the extended portion 1f of the semiconductor film 1 for forming the TFT 30 for pixel switching is made conductive, and the lower electrode 41 is overlapped with the capacitor line 3b as the upper electrode. It has become.

As shown in FIG. 5B, the cross section of the pixel 100a configured as described above along the line C-C 'has a thickness of 300 nm to 500 nm on the surface of the transparent substrate 10' as the base of the TFT array substrate 10. Base protective film 11 made of silicon oxide film (insulating film)
An island-shaped semiconductor film 1 a having a thickness of 30 nm to 100 nm is formed on the surface of the base protective film 11. The surface of the semiconductor film 1a has a thickness of about 50 to
A gate insulating film 2 made of a 150 nm silicon oxide film is formed, and a scanning line 3 a having a thickness of 300 nm to 800 nm is formed on the surface of the gate insulating film 2. In the semiconductor film 1a, a region facing the scanning line 3a via the gate insulating film 2 is a channel region 1a ′. A source region including a low concentration source region 1b and a high concentration source region 1d is formed on one side of the channel region 1a ', and a drain including a low concentration drain region 1c and a high concentration drain region 1e is formed on the other side. A region is formed.

On the surface side of the TFT 30 for pixel switching, the thickness is 300 nm to 800 n.
An interlayer insulating film 4 made of m silicon oxide film is formed, and a surface protective film (not shown) made of a silicon nitride film having a thickness of 100 nm to 300 nm is formed on the surface of the interlayer insulating film 4. There is. The surface of the interlayer insulating film 4 has a thickness of 300 nm.
A data line 6 a of ˜800 nm is formed, and the data line 6 a is electrically connected to the high concentration source region 1 d through a contact hole formed in the interlayer insulating film 4. A drain electrode 6b formed simultaneously with the data line 6a on the surface of the interlayer insulating film 4
The drain electrode 6b is electrically connected to the high-concentration drain region 1e through a contact hole formed in the interlayer insulating film 4.

A concavo-convex forming layer 13a made of a first photosensitive resin is formed in a predetermined pattern on the interlayer insulating film 4, and an upper insulating film made of a second photosensitive resin is formed on the surface of the concavo-convex forming layer 13a. 7a is formed. A light reflecting film 8a made of an aluminum film or the like is formed on the surface of the upper insulating film 7a. Therefore, the light reflecting film 8
The unevenness of the unevenness forming layer 13a is reflected on the surface of a through the upper insulating film 7a,
A concavo-convex pattern 8g composed of a concave portion 8c and a convex portion 8b is formed.

Here, as shown in FIGS. 4 and 5A, the light reflecting layer 8a is formed only on one short side of the pair of short sides of the substantially rectangular pixel 100a, and the other short side. Is a light transmission window 8d in which the light reflection layer 8a is not formed. Therefore, in the substantially rectangular pixel 100a, one short side where the light reflecting layer 8a is formed is a reflective display region 100b, and the other short side where the light transmitting window 8d is formed is a transmissive display. This is a region 100c. In other words, the boundary portion 27 between the transmissive display region 100c and the reflective display region 100b extends linearly in parallel with the short side in the pixel 100a, and the three sides of the transmissive display region 100c overlap with the three sides of the pixel 100a. Yes.

In FIG. 5B again, a pixel electrode 9a made of an ITO film is formed on the upper layer of the light reflecting film 8a. The pixel electrode 9a is directly laminated on the surface of the light reflecting film 8a, and the pixel electrode 9a and the light reflecting film 8a are electrically connected. Further, the pixel electrode 9
a is electrically connected to the drain electrode 6 b through a contact hole formed in the photosensitive resin layer 7 a and the interlayer insulating film 4.

An alignment film 12 made of a polyimide film is formed on the surface side of the pixel electrode 9a. The alignment film 12 is a film obtained by performing a rubbing process on a polyimide film.

Further, the extension line 1f (lower electrode) from the high-concentration drain region 1e is opposed to the capacitor line 3b as an upper electrode through an insulating film (dielectric film) formed simultaneously with the gate insulating film 2. Thus, the storage capacitor 60 is configured.

The TFT 30 preferably has an LDD structure as described above, but may have an offset structure in which impurity ions are not implanted into regions corresponding to the low concentration source region 1b and the low concentration drain region 1c. . In addition, the TFT 30
It may be a self-aligned TFT in which impurity ions are implanted at a high concentration using a gate electrode (a part of the scanning line 3a) as a mask to form high concentration source and drain regions in a self-aligning manner.

In this embodiment, a single gate structure is employed in which only one gate electrode (scanning line 3a) of the TFT 30 is disposed between the source and drain regions. However, two or more gate electrodes may be disposed therebetween. Good. At this time, the same signal is applied to each gate electrode. If the TFT 30 is configured with dual gates (double gates) or more than triple gates in this manner, leakage current at the junction between the channel and the source-drain region can be prevented, and the current during OFF can be reduced. If at least one of these gate electrodes has an LDD structure or an offset structure, the off-current can be further reduced and a stable switching element can be obtained.

The TFT array substrate 10 and the counter substrate 20 have a substrate interval defined by the gap material 5 dispersed on one substrate.

(Configuration of counter substrate)
In the counter substrate 20, a light shielding film 23 called a black matrix or a black stripe is formed in a region facing the vertical and horizontal boundary portions of the pixel electrodes 9 a formed on the TFT array substrate 10. A counter electrode 21 (second electrode) made of an ITO film is formed. An alignment film 22 made of a polyimide film is formed on the upper layer side of the counter electrode 21, and this alignment film 22 is a film obtained by rubbing the polyimide film.

In the counter substrate 20, on the lower layer side of the counter electrode 21, R, G, and B color filters having a thickness of 1 μm to several μm are formed in a region facing the pixel electrode 9a. However, in the transflective liquid crystal device 100, when the display in the reflection mode and the display in the transmission mode are performed, the transmission display light passes through the color filter and is emitted only once as indicated by an arrow LB. On the other hand, the reflected display light passes through the color filter twice as indicated by the arrow LA. For this reason, in this embodiment, the counter substrate 2
Of the 0 surface, a reflective display color filter 242 having a narrow chromaticity region is formed in the reflective display region 100b where the light reflective film 8a is formed, while the transmissive window 8d.
A transmissive display color filter 242 having a wide chromaticity region is formed in the transmissive display region 100c in which is formed.

Here, in the pixel 100a, one short side where the light reflection layer 8a is formed is a reflective display region 100b, and the other short side which is a light transmission window 8d is a transmissive display region 100c. Therefore, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 extends in parallel with the short side of the pixel 100a.

Further, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 is arranged on the reflective display region 100b side so as to be shifted from the boundary portion 27 between the reflective display region 100b and the transmissive display region 100c. . Here, a light shielding film is conventionally formed at the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242, but in this embodiment, such a light shielding film is not formed.

In the counter substrate 20, first, the light shielding film 23 is formed using the photolithography technique, and then the reflective display color filter 242 and the transmission film are used using the photolithography technique, the flexographic printing method, or the ink jet method. It can be manufactured by forming the display color filter 242 and then forming the counter electrode 21 and the alignment film 22.

(Operation and effect of this form)
In an electronic device equipped with the transflective liquid crystal device 100 having such a configuration, during standby, display is performed in a reflection mode using reflected display light indicated by an arrow LA, while the backlight is turned on during use. In addition to the reflection mode, display in the transmission mode using the transmission display light indicated by the arrow LB is also performed.

In correspondence with such a usage pattern, in this embodiment, the color filter 2 for transmissive display is used.
The boundary portion 26 between the color filter 41 and the reflective display color filter 242 is displayed in the reflective display area 100.
It is arranged on the b side. For this reason, the boundary portion 26 of the color filter is not applied to the transmissive display region 100c, and the transmissive display color filter 241 is appropriately formed. Therefore, even if there is an overlap of the color filters 241 and 242 or a gap between the color filters 241 and 242 at the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242, transmission is performed in addition to the reflection mode. When the display is used even in the mode, the displayed image is not affected by the boundary portion 26 of the color filter. Therefore, since it is not necessary to form a light-shielding film at the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242 in the counter substrate 20, an image can be displayed with a sufficient amount of light.

In this embodiment, the boundary portion 27 between the transmissive display region 100c and the reflective display region 100b extends in a straight line parallel to the short side in the pixel 100a, and the three sides of the transmissive display region 100b are three of the pixel 100a. It overlaps the side. For this reason, since the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242 can be minimized, it is possible to minimize the influence of the boundary portion 26 whose coloring is unstable.

[Embodiment 2]
FIGS. 6A and 6B are explanatory diagrams schematically showing a state in which a reflective display region and a transmissive display region are formed in the pixels of the transflective liquid crystal device according to the second embodiment of the present invention. FIG. 5 is a cross-sectional view when cutting a part of a pixel at a position corresponding to the line CC ′ in FIG. 4. In this embodiment and any of the embodiments described below,
The basic configuration is the same as that of the first embodiment. Therefore, common portions are denoted by the same reference numerals, description thereof is omitted, and only the configuration of the counter substrate, which is a feature point of each embodiment, will be described.

6A and 6B, in the present embodiment as well, in the same manner as in the first embodiment, the reflective display region 100b in which the light reflecting film 8a is formed on the surface of the counter substrate 20,
While a reflective display color filter 242 having a narrow chromaticity region is formed, the transmission window 8
A transmissive display color filter 242 having a wide chromaticity region is formed in the transmissive display region 100c where d is formed. The pixel 100a has a reflective display region 100b on one short side where the light reflecting layer 8a is formed, and a transmissive display region 100c on the other short side forming the light transmission window 8d. Therefore, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 extends linearly in parallel with the short side of the pixel 100a.

Also in this embodiment, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 is shifted from the boundary portion 27 between the reflective display region 100b and the transmissive display region 100c, and the reflective display region 100b side. Is arranged.

Here, in the first embodiment, the reflective display color filter 242 and the transmissive display color filter 242 are formed so as not to overlap with each other at the boundary portion 26, and no gap is formed. In the boundary portion 26, the reflective display color filter 242 and the transmissive display color filter 242 partially overlap.

A light shielding film is conventionally formed at the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242, but in the present embodiment, such a light shielding film is not formed.

In the transflective liquid crystal device 100 configured as described above, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 starts from the boundary portion 27 between the reflective display region 100b and the transmissive display region 100c. The reflective display color filter 242 and the transmissive display color filter 242 partially overlap with each other at the boundary portion 26. For this reason, at the time of standby, when performing display in the reflection mode using the reflection display light indicated by the arrow LA, no light leakage occurs.

Further, since the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242 is arranged on the reflective display region 100b side, the transmissive display region 100 is displayed.
The boundary portion 26 of the color filter is not applied to c, and the transmissive display color filter 241 is appropriately formed. Therefore, even if the color filters 241 and 242 overlap at the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242 in the reflective display region 100b, the display is performed in the transmissive mode in addition to the reflective mode. During use, the displayed image is not affected by the boundary portion 26 of the color filter. Therefore, since it is not necessary to form a light-shielding film at the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242 in the counter substrate 20, an image can be displayed with a sufficient amount of light.

[Embodiment 3]
FIGS. 7A and 7B are explanatory diagrams schematically showing a state in which a reflective display region and a transmissive display region are formed in the pixels of the transflective liquid crystal device according to the third embodiment of the present invention. FIG. 5 is a cross-sectional view when cutting a part of a pixel at a position corresponding to the line CC ′ in FIG. 4.

7A and 7B, in this embodiment as well, in the same manner as in the first embodiment, the reflective display region 100b in which the light reflecting film 8a is formed on the surface of the counter substrate 20,
While a reflective display color filter 242 having a narrow chromaticity region is formed, the transmission window 8
A transmissive display color filter 242 having a wide chromaticity region is formed in the transmissive display region 100c where d is formed. The pixel 100a has a reflective display region 100b on one short side where the light reflecting layer 8a is formed, and a transmissive display region 100c on the other short side forming the light transmission window 8d. Therefore, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 extends linearly in parallel with the short side of the pixel 100a.

Also in this embodiment, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 is shifted from the boundary portion 27 between the reflective display region 100b and the transmissive display region 100c, and the reflective display region 100b side. Is arranged.

Here, in the first embodiment, the reflective display color filter 242 and the transmissive display color filter 242 are formed so as not to overlap with each other at the boundary portion 26, and no gap is formed. In the boundary portion 26, a gap 28 is left between the reflective display color filter 242 and the transmissive display color filter 242.

A light shielding film is conventionally formed at the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242, but in the present embodiment, such a light shielding film is not formed.

In the transflective liquid crystal device 100 configured as described above, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 starts from the boundary portion 27 between the reflective display region 100b and the transmissive display region 100c. A gap 28 is formed between the reflective display color filter 242 and the transmissive display color filter 242 at the boundary portion 26. Still, when performing display in the reflection mode using the reflected display light indicated by the arrow LA during standby, the amount of light that the external light enters from the gap 28 and exits from the gap 28 without passing through the color filter 242 is extremely high. Since it is small, it hardly affects the image quality.

Further, since the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242 is arranged on the reflective display region 100b side, the transmissive display region 100 is displayed.
The boundary portion 26 of the color filter is not applied to c, and the transmissive display color filter 241 is appropriately formed. Therefore, even if there is a gap 28 between the color filters 241 and 242 at the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242, in the reflective display area 100b, light leaks from the gap 28. Therefore, when the display is performed in the transmissive mode in addition to the reflective mode, the displayed image is not affected by the boundary portion 26 of the color filter. Therefore, since it is not necessary to form a light-shielding film at the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242 in the counter substrate 20, an image can be displayed with a sufficient amount of light.

In this embodiment, the boundary portion 27 between the transmissive display region 100c and the reflective display region 100b extends in a straight line parallel to the short side in the pixel 100a, and the three sides of the transmissive display region 100b are three of the pixel 100a. It overlaps the side. For this reason, since the boundary portion 26 between the transmissive display color filter 241 and the reflective display color filter 242 can be minimized, it is possible to minimize the influence of the boundary portion 26 whose coloring is unstable.

[Embodiment 4]
FIGS. 8A and 8B are explanatory diagrams schematically showing a state in which a reflective display area and a transmissive display area are formed in the pixels of the transflective liquid crystal device according to the fourth embodiment of the present invention. FIG. 5 is a cross-sectional view when cutting a part of a pixel at a position corresponding to the line CC ′ in FIG. 4.

8A and 8B, also in this embodiment, in the same manner as in Embodiment 3, in the reflective display region 100b where the light reflecting film 8a is formed on the surface of the counter substrate 20,
While a reflective display color filter 242 having a narrow chromaticity region is formed, the transmission window 8
A transmissive display color filter 242 having a wide chromaticity region is formed in the transmissive display region 100c where d is formed. In addition, in the pixel 100a, one short side where the light reflecting layer 8a is formed is a reflective display region 100b, and the other short side which is a light transmitting window 8d is a transmissive display region 100c. Therefore, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 extends parallel to the short side of the pixel 100a.

Also in the present embodiment, as in the third embodiment, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 is reflected in the reflective display region 1.
The reflective display area 100 is shifted from the boundary portion 27 between 00b and the transmissive display area 100c.
It is arranged on the b side. Here, in the boundary portion 26, a gap 28 is left between the reflective display color filter 242 and the transmissive display color filter 242.

A light shielding film is conventionally formed at the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242, but in the present embodiment, such a light shielding film is not formed.

In this embodiment, the transmissive display color filter 241 uses a thin color material with a wide chromaticity range, while the reflective display color filter 242 uses a thick color material with a narrow chromaticity range. Yes. For this reason, the liquid crystal layer 50 in the reflective display region 100b.
The layer thickness d is considerably smaller than the layer thickness d of the liquid crystal layer 50 in the transmissive display region 100c.

Furthermore, in this embodiment, the interval between the TFT array substrate 10 and the counter substrate 20 is defined by the columnar protrusions 40 formed on the TFT array substrate 10, and a gap material is scattered between the TFT array substrate 10 and the counter substrate 20. It has not been.

In the transflective liquid crystal device 100 configured in this way, when performing display in the reflection mode using the reflected display light indicated by the arrow LA during standby, external light enters from the gap 28 and is emitted from the gap 28 as it is. Since the amount of light that is generated is extremely small, the same effects as in the third embodiment are obtained, such as having little influence on the image quality.

In this embodiment, the thicknesses of the transmissive display color filter 241 and the reflective display color filter 242 are changed, and the layer thickness d of the liquid crystal layer 50 in the reflective display region 100b is changed to the layer of the liquid crystal layer 50 in the transmissive display region 100c. It is considerably thinner than the thickness d. Therefore, while the transmissive display light passes through the liquid crystal layer 50 and is emitted only once, the reflective display light passes through the liquid crystal layer 50 twice, but in this embodiment, the transmissive display light is transmitted. In both the display light and the reflected display light, the retardation Δn · d can be optimized, so that high-quality display can be performed.

Further, the columnar protrusions 40 formed on the TFT array substrate 10 define the distance between the TFT array substrate 10 and the counter substrate 20, and no gap material is scattered between the TFT array substrate 10 and the counter substrate 20. Even if the counter substrate 20 has irregularities due to the layer thickness adjusting layer 25, the problem that the gap material accumulates in the concave portions and does not function does not occur. Therefore, the interval between the TFT array substrate 10 and the counter substrate 20 is accurately defined, and the retardation Δn · d is optimized.
High-quality display can be performed.

[Embodiment 5]
FIGS. 9A and 9B are explanatory diagrams schematically showing a state in which a reflective display region and a transmissive display region are formed in the pixels of the transflective liquid crystal device according to the fifth embodiment of the present invention. FIG. 5 is a cross-sectional view when cutting a part of a pixel at a position corresponding to the line CC ′ in FIG. 4.

9A and 9B, in the present embodiment as well, in the same manner as in the third embodiment, the reflective display region 100b in which the light reflecting film 8a is formed on the surface of the counter substrate 20,
While a reflective display color filter 242 having a narrow chromaticity region is formed, the transmission window 8
A transmissive display color filter 242 having a wide chromaticity region is formed in the transmissive display region 100c where d is formed. In addition, in the pixel 100a, one short side where the light reflecting layer 8a is formed is a reflective display region 100b, and the other short side which is a light transmitting window 8d is a transmissive display region 100c. Therefore, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 extends parallel to the short side of the pixel 100a.

Also in this embodiment, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 is shifted from the boundary portion 27 between the reflective display region 100b and the transmissive display region 100c, and the reflective display region 100b side. Is arranged. Here, in the boundary portion 26, a gap 28 is left between the reflective display color filter 242 and the transmissive display color filter 242.

A light shielding film is conventionally formed at the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242, but in the present embodiment, such a light shielding film is not formed.

In the present embodiment, the reflective display color filter 2 of the surface of the counter substrate 20 is used.
A layer thickness adjusting layer 25 made of a transparent layer such as an acrylic resin or a polyimide resin is formed between 2 μm and 4 μm between the layers 42 and the counter electrode 21. For this reason, the layer thickness d of the liquid crystal layer 50 in the reflective display region 100b is equal to the transmissive display region 100.
It is thinner than the layer thickness d of the liquid crystal layer 50 at c. Here, the end portion 25 of the layer thickness adjusting layer 25
Although 0 is a tapered surface, such a tapered end 250 is located in the reflective display region 100b.

Furthermore, in this embodiment, the height formed on the TFT array substrate 10 is 2 μm to 3 μm.
A space between the TFT array substrate 10 and the counter substrate 20 is defined by the columnar protrusions 40 of μm, and no gap material is scattered between the TFT array substrate 10 and the counter substrate 20.

In the transflective liquid crystal device 100 configured in this way, when performing display in the reflection mode using the reflected display light indicated by the arrow LA during standby, external light enters from the gap 28 and is emitted from the gap 28 as it is. Since the amount of light that is generated is extremely small, the same effects as in the third embodiment are obtained, such as having little influence on the image quality.

In this embodiment, the layer thickness adjusting layer 25 is provided on the counter substrate 20 side, and the layer thickness d of the liquid crystal layer 50 in the reflective display region 100b is considerably smaller than the layer thickness d of the liquid crystal layer 50 in the transmissive display region 100c. It is. Accordingly, the retardation Δn · d can be optimized in both the transmissive display light and the reflective display light, so that high-quality display can be performed.

In addition, in this embodiment, the end portion 250 of the layer thickness adjusting layer 25 has a tapered surface, and the layer thickness of the liquid crystal layer 50 is deviated from an appropriate value. Since it is located within 100b, such a deviation in the layer thickness does not affect the image quality when displaying in the transmission mode.

Further, the layer thickness adjusting layer 25 is formed on the counter substrate 20 side, that is, the substrate on which the pixel switching TFT 30 is not formed, and the layer thickness d of the liquid crystal layer 50 in the reflective display region 100b is changed to the transmissive display region. Layer thickness d of liquid crystal layer 50 at 100c
It is thinner. For this reason, even if the layer thickness adjusting layer 25 is provided, the exposure accuracy is not lowered in the photolithography process for forming the TFT 30 on the TFT array substrate 10. Therefore, the transflective liquid crystal device 100 having high reliability and high display quality can be provided.

Further, the columnar protrusions 40 formed on the TFT array substrate 10 define the distance between the TFT array substrate 10 and the counter substrate 20, and no gap material is scattered between the TFT array substrate 10 and the counter substrate 20. Even if the counter substrate 20 has irregularities due to the layer thickness adjusting layer 25, the problem that the gap material accumulates in the concave portions and does not function does not occur. Therefore, the interval between the TFT array substrate 10 and the counter substrate 20 is accurately defined, and the retardation Δn · d is optimized.
High-quality display can be performed.

[Embodiment 6]
FIGS. 10A and 10B are explanatory diagrams schematically showing a state in which a reflective display area and a transmissive display area are formed in the pixels of the transflective liquid crystal device according to the sixth embodiment of the present invention. FIG. 5 is a cross-sectional view when cutting a part of a pixel at a position corresponding to the line CC ′ in FIG. 4.

10A and 10B, also in this embodiment, in the same manner as in Embodiment 3, the reflective display region 100b on which the light reflecting film 8a is formed on the surface of the counter substrate 20 has a chromaticity region. In addition, a transmissive display color filter 242 having a wide chromaticity region is formed in the transmissive display region 100c in which the transmissive window 8d is formed. The pixel 100a has a reflective display region 100b on one short side where the light reflecting layer 8a is formed, and a transmissive display region 100c on the other short side forming the light transmission window 8d. Therefore, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 extends in parallel with the short side of the pixel 100a.

Also in this embodiment, the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242 is shifted from the boundary portion 27 between the reflective display region 100b and the transmissive display region 100c, and the reflective display region 100b side. Is arranged. Here, in the boundary portion 26, a gap 28 is left between the reflective display color filter 242 and the transmissive display color filter 242.

A light shielding film is conventionally formed at the boundary portion 26 between the reflective display color filter 242 and the transmissive display color filter 242, but in the present embodiment, such a light shielding film is not formed.

In this embodiment, a layer thickness adjustment layer 25 made of a transparent layer such as an acrylic resin or a polyimide resin is formed between the counter substrate 20 and the counter electrode 21, and the layer thickness adjustment layer 25 is a reflection display region. 100b thick, transmissive display area 100c
And thin. For this reason, the layer thickness d of the liquid crystal layer 50 in the reflective display region 100b is smaller than the layer thickness d of the liquid crystal layer 50 in the transmissive display region 100c. Here, the layer thickness adjusting layer 25 has a step 251 between a thick portion and a thin portion.
Is located in the reflective display region 100b.

Furthermore, in this embodiment, the interval between the TFT array substrate 10 and the counter substrate 20 is defined by the columnar protrusions 40 formed on the TFT array substrate 10, and a gap material is scattered between the TFT array substrate 10 and the counter substrate 20. It has not been.

In the transflective liquid crystal device 100 configured in this way, when performing display in the reflection mode using the reflected display light indicated by the arrow LA during standby, external light enters from the gap 28 and is emitted from the gap 28 as it is. Since the amount of light that is generated is extremely small, the same effects as in the third embodiment are obtained, such as having little influence on the image quality.

In this embodiment, the layer thickness adjusting layer 25 is provided on the counter substrate 20 side, and the layer thickness d of the liquid crystal layer 50 in the reflective display region 100b is considerably smaller than the layer thickness d of the liquid crystal layer 50 in the transmissive display region 100c. It is. Accordingly, the retardation Δn · d can be optimized in both the transmissive display light and the reflective display light, so that high-quality display can be performed.

Moreover, the layer thickness adjusting layer 25 has a tapered step 251 between the thick portion and the thin portion, and the layer thickness of the liquid crystal layer 50 deviates from an appropriate value.
1 is located in the reflective display region 100b, such a layer thickness deviation is
When displaying in the transmissive mode, the image quality is not affected.

Further, the layer thickness adjusting layer 25 is formed on the counter substrate 20 side, that is, the substrate on which the pixel switching TFT 30 is not formed, and the layer thickness d of the liquid crystal layer 50 in the reflective display region 100b is changed to the transmissive display region. Layer thickness d of liquid crystal layer 50 at 100c
It is thinner. For this reason, even if the layer thickness adjusting layer 25 is provided, the exposure accuracy is not lowered in the photolithography process for forming the TFT 30 on the TFT array substrate 10. Therefore, the transflective liquid crystal device 100 having high reliability and high display quality can be provided.

Further, the columnar protrusions 40 formed on the TFT array substrate 10 define the distance between the TFT array substrate 10 and the counter substrate 20, and no gap material is scattered between the TFT array substrate 10 and the counter substrate 20. Even if the counter substrate 20 has irregularities due to the layer thickness adjusting layer 25, the problem that the gap material accumulates in the concave portions and does not function does not occur. Therefore, the interval between the TFT array substrate 10 and the counter substrate 20 is accurately defined, and the retardation Δn · d is optimized.
High-quality display can be performed.

[Other embodiments]
In the fourth, fifth, and sixth embodiments, each configuration is added to the third embodiment, but the first and second embodiments are described in the fourth, fifth, and sixth embodiments. Configurations may be added.

In the fourth, fifth and sixth embodiments, the example in which the substrate spacing is controlled by the columnar protrusions 40 in the liquid crystal device in which the layer thickness adjusting layer 25 is formed on the counter substrate 20 has been described. For the liquid crystal device in which the layer thickness adjusting layer 25 is formed on the substrate 10, the substrate interval may be controlled by the columnar protrusions 40.

  Further, the columnar protrusions 40 may be formed on the counter substrate 20 side.

Furthermore, in the above embodiment, TF is used as an active element for pixel switching.
Although an example using T has been described, MIM (Metal Ins) is used as an active element.
Thin film diode elements (ultrametal) elements (TFD elements / Th
The same applies when an in Film Diode element) is used.

[Application of transflective liquid crystal device to electronic equipment]
The transflective liquid crystal device 100 configured as described above can be used as a display unit of various electronic devices, and an example thereof will be described with reference to FIGS. 11, 12, and 13.

FIG. 11 is a block diagram showing a circuit configuration of an electronic apparatus using the transflective liquid crystal device according to the present invention as a display device.

In FIG. 11, an electronic device includes a display information output source 70, a display information processing circuit 71,
A power supply circuit 72, a timing generator 73, and a liquid crystal device 74 are included. The liquid crystal device 74 includes a liquid crystal display panel 75 and a drive circuit 76. As the liquid crystal device 74, the above-described transflective liquid crystal device 100 can be used.

The display information output source 70 is a ROM (Read Only Memory), RA.
A memory unit such as M (Random Access Memory), a storage unit such as various disks, a tuning circuit that tunes and outputs a digital image signal, and an image signal in a predetermined format based on various clock signals generated by the timing generator 73 And the like are supplied to the display information processing circuit 71.

The display information processing circuit 71 includes a serial-parallel conversion circuit, an amplification / inversion circuit,
It has various known circuits such as a rotation circuit, a gamma correction circuit, a clamp circuit, etc., executes processing of input display information, and converts the image signal into a clock signal CL
It is supplied to the drive circuit 76 together with K. The power supply circuit 72 supplies a predetermined voltage to each component.

FIG. 12 shows a mobile personal computer which is an embodiment of the electronic apparatus according to the present invention. The personal computer 80 shown here has a main body 82 provided with a keyboard 81 and a liquid crystal display unit 83. The liquid crystal display unit 83 includes the transflective liquid crystal device 100 described above.

FIG. 13 shows a mobile phone which is another embodiment of the electronic apparatus according to the invention. A cellular phone 90 shown here includes a plurality of operation buttons 91 and a display unit including the above-described transflective liquid crystal device 100.

As described above, in the present invention, the boundary portion between the color filter for transmissive display and the color filter for reflective display is arranged on the reflective display region side in correspondence with the usage pattern of the transflective liquid crystal device. Is appropriately formed with a color filter for transmissive display. Therefore, even when the color filter overlaps or has a gap between the color filters at the boundary between the color filter for transmissive display and the color filter for reflective display, the displayed image is displayed in the transmissive mode in addition to the reflective mode. The influence of the boundary portion of the color filter does not appear. Therefore, since it is not necessary to form a light-shielding film at the boundary between the transmissive display color filter and the reflective display color filter on the second transparent substrate, an image can be displayed with a sufficient amount of light.

It is a top view when the transflective liquid crystal device to which the present invention is applied is viewed from the counter substrate side. It is sectional drawing in the HH 'line of FIG. FIG. 4 is an equivalent circuit diagram of elements formed in a plurality of pixels in a matrix form in a transflective liquid crystal device. It is a top view which shows the structure of each pixel of the TFT array substrate of the transflective liquid crystal device according to the present invention. (A), (B) is explanatory drawing which shows typically a mode that the reflection display area | region and the transmission display area | region are comprised by the pixel in the transflective liquid crystal device which concerns on Embodiment 1 of this invention, FIG. 5 is a cross-sectional view when a part of a pixel is cut at a position corresponding to a line CC ′ in FIG. 4. (A), (B) is explanatory drawing which shows typically a mode that the reflective display area | region and the transmissive display area | region are comprised by the pixel in the transflective liquid crystal device which concerns on Embodiment 2 of this invention, FIG. 5 is a cross-sectional view when a part of a pixel is cut at a position corresponding to a line CC ′ in FIG. 4. (A), (B) is explanatory drawing which shows typically a mode that the reflective display area and the transmissive display area are comprised by the pixel in the transflective liquid crystal device which concerns on Embodiment 3 of this invention, FIG. 5 is a cross-sectional view when a part of a pixel is cut at a position corresponding to a line CC ′ in FIG. 4. (A), (B) is explanatory drawing which shows typically a mode that the reflective display area and the transmissive display area are comprised by the pixel in the transflective liquid crystal device which concerns on Embodiment 4 of this invention, FIG. 5 is a cross-sectional view when a part of a pixel is cut at a position corresponding to a line CC ′ in FIG. 4. (A), (B) is explanatory drawing which shows typically a mode that the reflective display area and the transmissive display area are comprised by the pixel in the transflective liquid crystal device which concerns on Embodiment 5 of this invention, FIG. 5 is a cross-sectional view when a part of a pixel is cut at a position corresponding to a line CC ′ in FIG. 4. (A), (B) is explanatory drawing which shows typically a mode that the reflective display area and the transmissive display area are comprised by the pixel in the transflective liquid crystal device which concerns on Embodiment 6 of this invention, FIG. 5 is a cross-sectional view when a part of a pixel is cut at a position corresponding to a line CC ′ in FIG. 4. It is a block diagram which shows the circuit structure of the electronic device using the transflective liquid crystal device which concerns on this invention as a display apparatus. It is explanatory drawing which shows the mobile personal computer using the transflective liquid crystal device which concerns on this invention. It is explanatory drawing of the mobile telephone using the transflective liquid crystal device which concerns on this invention. (A) and (B) are an explanatory view schematically showing a state in which a reflective display region and a transmissive display region are formed in a pixel in a conventional transflective liquid crystal device, and a cross-sectional view of the pixel, respectively. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Semiconductor film 2 Gate insulating film 3a Scan line 3b Capacitance line 4 Interlayer insulating film 6a Data line 6b Drain electrode 7a Upper layer insulating film 8a Light reflecting film 8d Light transmitting window 8g Uneven pattern 9a on the light reflecting film Pixel electrode 10 TFT array substrate DESCRIPTION OF SYMBOLS 11 Base protective film 13a Concavity and convexity formation layer 20 Counter substrate 21 Counter electrode 23 Light shielding film 25 Layer thickness adjustment layer 26 Color filter boundary portion 27 Reflection display region and transmission display region boundary portion 28 Color filter gap 30 For pixel switching TFT
40 columnar projection 70 liquid crystal 60 storage capacitor 100 transflective liquid crystal device 100a pixel 100b reflective display region 100c transmissive display region 241 transmissive display color filter 242 reflective display color filter

Claims (15)

A first transparent substrate having a first transparent electrode and pixel switching elements formed in a matrix on the surface, and a second transparent electrode constituting a pixel facing the first transparent electrode are formed on the surface. A second transparent substrate, and a liquid crystal layer held between the first transparent substrate and the second transparent substrate,
In the transflective liquid crystal device, on the first transparent substrate side, a light reflection layer having a partial display area in the pixel as a reflective display area and the remaining area as a transmissive display area is formed.
On the second transparent substrate, a transmissive display color filter is formed in the transmissive display region, and a reflective display color filter having a chromaticity range narrower than the transmissive display color filter is formed in the reflective display region. Formed and
A transflective liquid crystal device, wherein a boundary portion between the color filter for transmissive display and the color filter for reflective display is located on the reflective display region side. 2. The transflective reflection according to claim 1, wherein the transmissive display color filter and the reflective display color filter overlap each other at a boundary portion between the transmissive display color filter and the reflective display color filter. Type liquid crystal device. 2. The gap between the transmissive display color filter and the reflective display color filter according to claim 1, wherein a gap is formed between the transmissive display color filter and the reflective display color filter at a boundary portion between the transmissive display color filter and the reflective display color filter. Transflective liquid crystal device. 4. The pixel according to claim 1, wherein the pixel has a substantially rectangular planar shape,
A boundary portion between the transmissive display area and the reflective display area extends linearly within the pixel, and the three sides of the transmissive display area overlap the three sides of the pixel. Liquid crystal device. 5. The transflective liquid crystal device according to claim 4, wherein a boundary portion between the transmissive display area and the reflective display area extends in parallel with a short side of the pixel. The light-shielding film is formed on the second transparent substrate according to any one of claims 1 to 5,
The light-shielding film is not formed at a boundary portion between the transmissive display color filter and the reflective display color filter. 7. The reflective display color filter according to claim 1, wherein the reflective display color filter is formed thicker than the transmissive display color filter, so that the thickness of the liquid crystal layer in the reflective display region is the transmissive display region. A transflective liquid crystal device, wherein the liquid crystal layer is thinner than the liquid crystal layer. 7. The thickness of the liquid crystal layer in the reflective display region is set on the surface of at least one of the first transparent substrate and the second transparent substrate according to claim 1. A transflective liquid crystal device, characterized in that a layer thickness adjusting layer that is thinner than the liquid crystal layer is formed. 9. The transflective display device according to claim 8, wherein the layer thickness adjusting layer is a transparent layer formed on the second transparent substrate. 10. The transflective display device according to claim 9, wherein the layer thickness adjusting layer is selectively formed in a region overlapping with the reflective display color filter. 11. The transflective display device according to claim 10, wherein an end portion of the layer thickness adjusting layer is located in the reflective display region. 10. The transflective liquid crystal device according to claim 9, wherein the layer thickness adjusting layer is thick in the reflective display region and is thinner in the transmissive display region than in the reflective display region. 13. The layer thickness adjusting layer according to claim 12, wherein a boundary portion between a portion formed thick in the reflective display region and a portion formed thin in the transmissive display region is located in the reflective display region. A transflective liquid crystal device characterized by the above. 14. The method according to claim 7, wherein at least one surface of the first transparent substrate and the second transparent substrate protrudes from one substrate and comes into contact with the other substrate. 1 transparent substrate and the second
A transflective liquid crystal device, characterized in that a columnar protrusion defining a distance between the transparent substrate and the transparent substrate is formed. 15. An electronic apparatus comprising a transflective liquid crystal device as defined in claim 1 in a display portion.

Images