JP2007121368A - Liquid crystal device, and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal device which can select the most suitable display mode corresponding to a state of external light, that is, a clear color display is available in a transmission mode, and a bright mono-color display or a monochromatic display is available in a reflective mode, and reduction of power consumption is also materialized. <P>SOLUTION: The liquid crystal device 1 is equipped with a liquid crystal panel 1a comprising a liquid crystal layer 50 interposed between a pair of substrates 10, 20, and is provided with pixels A each of which is formed of a plurality of sub-pixels 41R, 41G, 41B, 41W respectively corresponding to mutually different colors, wherein each of pixels A is constructed by disposing a transmission display area T to conduct a transmission display and a reflective display area R to conduct a reflective display, and is characterized by having the transmission display area T constructed with a plurality of sub-pixels 41R, 41G, 41B, and meanwhile, having the reflective display area R constructed with the sub-pixel 41W different from the sub-pixels constituting the transmission display area T. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a liquid crystal device having a reflection mode and a transmission mode, and a transmission / reflection mode for performing both reflection and transmission, and an electronic apparatus.

In recent years, transflective liquid crystal devices having both a reflection mode and a transmission mode have been widely used as display devices such as mobile phones and PDAs. As such a transflective liquid crystal device, a reflective film in which a slit (opening) for light transmission is formed on a metal film such as aluminum is provided on the inner surface of the lower substrate, and this reflective film functions as a transflective film. What is to be known is known. In this case, in the reflection mode, external light incident from the upper substrate side is reflected by the reflection film on the inner surface of the lower substrate after passing through the liquid crystal layer, and again passes through the liquid crystal layer and is emitted from the upper substrate side for display. Contribute. On the other hand, in the transmissive mode, light from the backlight incident from the lower substrate side passes through the liquid crystal layer from the opening of the reflective film, and then is emitted to the outside from the upper substrate side, contributing to display. Therefore, of the reflective film formation region, the region where the opening is formed is the transmissive display region, and the other region is the reflective display region (see Patent Document 1).
JP 2003-43239 A

As such a transflective liquid crystal device, a liquid crystal device in which a color filter is provided on either an upper substrate or a lower substrate is widely used. For example, Patent Document 1 discloses a liquid crystal device in which a color filter is provided only in a transmissive display region (an opening portion of a reflective film). I earn.

However, in the above-described liquid crystal device, a transmissive display area and a reflective display area are provided in one subpixel (subpixel). Therefore, (1) the display quality is reduced due to the mixture of the monochrome component of the reflective display in the transmissive color display, (2) the display quality is deteriorated due to the reflected monochrome display mixed with the reflected light from the transmissive display area, and (3) the reflection. Since the liquid crystal cannot be driven only in the display area and the transmissive display area, problems such as waste of power consumption due to driving sub-pixels that do not contribute to display may occur.

The present invention has been made in view of such circumstances, and it is possible to select an optimal display mode according to the state of external light, vivid color display is possible in the transmissive mode, and bright in the reflective mode. It is an object of the present invention to provide a liquid crystal device capable of monochromatic display or monochrome display and also capable of reducing power consumption, and an electronic apparatus including the liquid crystal device.

In order to solve the above problems, a liquid crystal device of the present invention is a liquid crystal device including a liquid crystal panel in which a liquid crystal layer is sandwiched between a pair of substrates, each of which includes a plurality of subpixels corresponding to different colors. Each of the pixels is provided with a transmissive display area for performing transmissive display and a reflective display area for performing reflective display, and the transmissive display area includes a plurality of the sub-pixels. On the other hand, the reflective display area is composed of the sub-pixels separate from the transmissive display area.

According to such a liquid crystal device, since the transmissive display area and the reflective display area are configured by separate sub-pixels, it is possible to perform transmissive and reflective display separately under optimum conditions. Further, unlike the conventional case where the transmissive display area and the reflective display area are arranged in the same subpixel, each display area is composed of separate subpixels. The pixel structure can be arbitrarily optimized, and the optical characteristics can be optimized for each of transmission and reflection displays. Furthermore, since each display area is composed of separate sub-pixels,
In one of the transmissive and reflective display modes, the power consumption can be reduced by setting the sub-pixel in the display state in one display region and in the non-drive state in the other display region. It becomes possible. In addition, since switching between the transmission mode and the reflection mode can be realized by driving each sub-pixel, it is possible to switch between transmission and reflection display according to the environment (state of external light). Further, in the configuration as in the conventional patent document 1, the transmissive display area and the reflective display area are arranged in the same sub-pixel, so that a problem of color mixing occurs, or reflected light is visually recognized or reflected during transmission. There is a problem that the transmitted light is sometimes seen and the contrast is lowered, but in the present invention, each display area has a separate sub-pixel, so that such a problem is greatly solved and color mixing is prevented. A high-contrast display will be realized.

In the liquid crystal device of the present invention, full-color display is performed in the transmissive display region, while mono-color display or monochrome display is performed in the reflective display region. In general, display is performed using a backlight (illumination device) in transmissive display, and display is performed using external light in reflective display. Accordingly, the transmissive display has higher display characteristics and better visibility than the reflective display. Therefore, in the present invention, the display is optimized by setting the transmissive display as a full color display and the reflective display as a monocolor display (monochrome display) or a monochrome display (monochrome display). Specifically, a red subpixel in which a red coloring layer is formed, a green subpixel in which a green coloring layer is formed, and a blue subpixel in which a blue coloring layer is formed are formed in the transmissive display area. While
A monochrome subpixel in which a colorless and translucent resin layer is formed or a monocolor subpixel in which a colored layer of a predetermined color is formed may be formed in the reflective display region.

The liquid crystal device of the present invention further includes a source driver that controls the amount of charge injected into each subpixel, and the source driver drives the subpixels in the transmissive display area and the reflective display area. A transmissive / reflective mode for performing transmissive display and reflective display, a transmissive mode for performing transmissive display by driving sub-pixels arranged in the transmissive display area, and driving a sub-pixel arranged in the reflective display area Thus, the reflection mode for performing the reflection display can be selected. According to such a configuration, the three driving states can be appropriately selected according to the environment (external light state). In the transmission / reflection mode, transmission is visible in a dark place and reflection is visible in a bright place.

In the liquid crystal device of the present invention, an illumination device that irradiates the liquid crystal panel with illumination light is disposed on the opposite side of the liquid crystal panel from the observation side, and the illumination device is turned off in the reflection mode. Can do. In other words, the illumination light of the illumination device is not necessary in the reflection mode, so if the illumination device is turned off as described above, it can contribute to a reduction in power consumption, and there is a problem that light leakage from the transmissive display area is visually recognized. Can also be prevented.

In the liquid crystal device of the present invention, the refresh rate for updating display data in the reflection mode may be lower than that in the transmission / reflection mode or the transmission mode. That is, in the reflective mono-color display or monochrome display, a still image or a monotone moving image display is often used, so that the refresh rate can be lowered.

Furthermore, in the reflection mode, the display of the sub-pixels disposed in the transmissive display area can be black. In the reflective mode, the transmissive display should not be visually recognized. If the sub-pixels in the transmissive display area are displayed in black in the reflective mode as described above, it is possible to prevent mixing of excess light on the display. .
On the other hand, in the transmissive mode, the display of the sub-pixels disposed in the reflective display area can be black. In the transmissive mode, the reflective display should not be visually recognized. As described above, if the sub-pixels in the reflective display area are displayed in black in the transmissive mode,
It is possible to prevent excessive light from being mixed on the display.
In the liquid crystal device of the present invention, a normally black mode is preferably adopted. As a result, the non-driven sub-pixel can be displayed in black.

In the liquid crystal device of the present invention, each of the sub-pixels in one pixel can be time-division driven using one of the source drivers. In this case, in the transmission / reflection combined mode, each subpixel of the transmissive display area and the subpixel of the reflective display area are time-division driven with one source output, and each subpixel of the transmissive display area is controlled with one source output in the transmissive mode. Time-sharing drive,
In the reflection mode, only the sub-pixels in the reflection display area can be time-division driven with one source output. By adopting such time division driving, the number of outputs of the source driver can be reduced. Further, by not selectively driving the sub-pixels that do not contribute to display, it is possible to widen the margin for data writing to the sub-pixels that contribute to display.

Furthermore, in the liquid crystal device of the present invention, a color filter layer including a colored layer is disposed on the liquid crystal layer side of at least one of the pair of substrates, and the color filter layer in the transmissive display region includes the color filter layer. A colored layer having a different color is provided for each sub-pixel, while a color layer or a colorless light-transmitting layer is provided for the single sub-pixel in the color filter layer of the reflective display region, and the reflective display A colored layer or a colorless light-transmitting layer in the region is formed so as to protrude toward the liquid crystal layer with respect to the colored layer in the transmissive display region, and the liquid crystal layer thickness in the reflective display region is smaller than the liquid crystal layer thickness in the transmissive display region It can be made. If a colored layer or a colorless light-transmitting layer arranged in the reflective display area is formed so as to protrude toward the liquid crystal layer and the thickness of the liquid crystal layer in the reflective display area is smaller than the liquid crystal layer thickness in the transmissive display area, It is possible to make the retardation uniform in the display area and the reflective display area. That is, in transmissive display, light incident from the illumination device passes through the liquid crystal layer once and is supplied to the observation side, whereas in reflective display, external light incident from the observation side passes through the liquid crystal layer and passes twice. Since it is provided on the observation side, the retardation value is non-uniform, but the retardation value can be made uniform by protruding the colored layer or the colorless light-transmitting layer on the liquid crystal layer as in the present invention. It is. In addition, it is preferable to design the protrusion amount to the liquid crystal layer of the colored layer or the colorless light-transmitting layer in the reflective display region to be half of the liquid crystal layer thickness.

In the liquid crystal device of the present invention, the sub pixels may have different areas. For example, when the reflective display is used preferentially, the area of the sub-pixels in the reflective display area may be increased. The display color of the sub-pixels in the reflective display area can be arbitrarily selected, but in order to improve the brightness with energy saving, it is preferably colorless (white),
In this case, it is possible to avoid problems such as coloring in transmissive display.

An electronic apparatus according to the present invention includes the above-described liquid crystal device according to the present invention.
Accordingly, it is possible to provide an electronic device including a display unit that can display bright color in the transmissive mode and bright monochromatic or monochrome in the reflective mode.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, in order to make each layer and each member the size which can be recognized on drawing, the scale is varied for every layer and each member.

[Liquid Crystal Device]
FIG. 1 is an overall plan view and a cross-sectional view showing a liquid crystal display device including a thin film transistor, and relates to an embodiment of the liquid crystal device of the present invention. That is, FIG. 1A is a plan configuration diagram of the liquid crystal display device 1 of the present embodiment as viewed from the counter substrate side together with the respective components, and FIG.
FIG. 2 is a cross-sectional configuration diagram taken along line HH shown in FIG. 1A, and FIG. 2 is a circuit configuration diagram of a plurality of subpixels arranged in a matrix in the display region of the liquid crystal device.

As shown in FIGS. 1A and 1B, the liquid crystal display device 1 according to the present embodiment includes a TFT array substrate (active matrix substrate) 10 and a counter substrate 20 having a substantially rectangular frame shape in plan view. The liquid crystal layer 50 is sealed in a region surrounded by the sealing material 52 and surrounded by the sealing material 52. Inside the frame-shaped sealing material 52, a peripheral parting part 53 having a rectangular frame shape in plan view is formed along the inner peripheral side, and an area inside the parting part is set as an image display area 54. A data line driving circuit 201 and an external circuit mounting terminal 202 are formed along one side (lower side in the drawing) of the TFT array substrate 10 in a region outside the sealing material 52.
Scan line driving circuits 204 and 204 are formed along two sides adjacent to the side, respectively. T
On the remaining one side (the upper side in the figure) of the FT array substrate 10, a plurality of wirings 205 that connect between the scanning line drive circuits 204 on both sides of the image display region 11 are provided.

Further, an inter-substrate conductive material 206 for providing electrical continuity between the TFT array substrate 10 and the counter substrate 20 is disposed at each corner of the counter substrate 20. The liquid crystal display device of this embodiment is configured as a liquid crystal display device capable of both transmissive and reflective display. Specifically, in the transmission mode, light from a light source (not shown) arranged on the TFT array substrate 10 side is used as the liquid crystal layer 50.
Thus, the light is appropriately modulated and emitted from the counter substrate 20 side. On the other hand, in the reflection mode, light (external light or the like) from the counter substrate 20 side is modulated in the liquid crystal layer 50 and reflected by the reflection film 13 (see FIG. 3) formed on the TFT array substrate 10, and the reflected light is reflected. Liquid crystal layer 50 again
Thus, the light is appropriately modulated and emitted from the counter substrate 20 side.

Instead of forming the data line driving circuit 201 and the scanning line driving circuits 204 and 204 on the TFT array substrate 10, for example, a COF (Chip On Fission) on which a driving LSI is mounted is used.
lm) The substrate and the terminal group formed on the periphery of the TFT array substrate 10 may be electrically and mechanically connected via an anisotropic conductive film. In the liquid crystal display device, the type of liquid crystal to be used, that is, TN (Twisted Nematic) mode, STN (Super Twisted N)
ematic) mode, vertical alignment mode, and other modes, and a retardation plate, a polarizing plate, etc. are arranged in a predetermined direction depending on the normally white mode / normally black mode, but the illustration is omitted here. .

In the image display area of the liquid crystal display device having such a structure, as shown in FIG. 2, a plurality of sub-pixels 41 are arranged in a matrix, and each of these sub-pixels 41 is provided for pixel switching. As a result, a p-type p-Si TFT 30 is formed. This TFT 30 has a multi-gate structure, which is TF compared to a single gate structure.
The drain-source voltage applied to one TFT of T30 can be reduced. A scanning line 3a is electrically connected to the plurality of gate electrodes of the TFT 30, and pulsed scanning signals G1, G2,..., Gm are applied in sequence in this order from the scanning line 3a at a predetermined timing. It has come to be. In addition, the data line 6a is electrically connected to the source portion of the TFT 30, and the image signals S1, S2,..., Sn are supplied within one scanning period.

The pixel electrode 9 is electrically connected to the drain portion of the TFT 30, and the image signals S1, S2,..., Sn supplied from the data line 6a within one scanning period are supplied to each sub-pixel at a predetermined timing. It is to be written. The predetermined level image signals S1, S2,..., Sn written in the liquid crystal via the pixel electrode 9 in this way are constant between the common electrode 21 of the counter substrate 20 shown in FIG. Hold for a period. Also, the held image signals S1, S2
In order to prevent Sn from leaking, a storage capacitor 70 is added in parallel with the liquid crystal capacitor formed between the pixel electrode 9 and the counter electrode 21.

FIG. 3 shows one pixel region (on the TFT array substrate 10 constituting the liquid crystal display device of this embodiment).
4 is a schematic plan view of one pixel region. In the present embodiment, four sub-pixels 41 (reference numerals 41R, 41G, and FIG.
41B and 41W) constitute one unit, and one pixel A is configured.
As shown in FIG. 2, the TFT array substrate 10 is provided with the above-described data lines 6a and scanning lines 3a intersecting each other, and a substantially rectangular shape defined by the data lines 6a and the scanning lines 3a. The sub-pixel 41 is configured by these areas. Then, sub-pixel 41 (41R, 4
1G, 41B, and 41W), a pixel electrode 9 having a rectangular shape in plan view made of a transparent conductive material such as ITO is formed in a plane region substantially overlapping with 1G, 41B, and 41W.

Here, in this embodiment, for each sub-pixel 41, the sub-pixel 41R displays red.
The sub-pixel 41G can display green, the sub-pixel 41B can display blue, and the sub-pixel 41W can display white. The sub-pixels 41R, 41B, and 41G constitute a transmissive display area T, and the sub-pixel 41W constitutes a reflective display area R. Therefore, in the liquid crystal display device 1 of the present embodiment, full color display is performed in the transmissive display region T, and monochrome display is performed in the reflective display region R. In addition, it is good also as a structure which can arrange | position a single colored layer in the reflective display area | region R, and can display the said reflective display area | region R in mono color.

Next, in the cross-sectional structure shown in FIG. 3, the TFT array substrate 10 is made of, for example, quartz, glass,
A base insulating film (not shown) is formed on one surface side of the substrate body 11 made of plastic or the like, and a TFT 30 (not shown in FIG. 3) is provided on the base insulating film. The TFT 30 is connected to the pixel electrode 9 and is configured to drive each pixel electrode 9 for switching.
The pixel electrode 9 is arranged in a matrix for each sub-pixel 41 (41R, 41G, 41B, 41W). In the reflective display region R, aluminum (
A reflective film 13 made of a light reflective material is formed, and a pixel electrode 9 is formed on the reflective film 13. An alignment film 16 made of a polyimide film or the like that has been subjected to an alignment process such as a rubbing process is provided on the outermost surface of the TFT array substrate 10.

On the other hand, the counter substrate 20 includes the color filter 12, the planarization film 24, the counter electrode 25, and the alignment film 26 on the liquid crystal layer 50 side of the substrate body 21. The color filter 12 includes a red colored layer 12R, a green colored layer 12G, a blue colored layer 12B, and a translucent resin layer 1 for each pixel A.
2W, each colored layer 12R, 12G, 12B, 12W is black matrix B
It is partitioned by M. The red colored layer 12R is disposed in the sub-pixel 41R,
The green colored layer 12G is disposed in the sub-pixel 41G and the blue colored layer 12B is disposed in the sub-pixel 41G to create a color for each sub-pixel, and the transmissive display area T including these color sub-pixels is capable of full color display. Has been.

Further, the translucent resin layer 12W is disposed in the sub-pixel 41W, contributes to monochrome display of the reflective display region R, and protrudes toward the liquid crystal layer 50 from the colored layers 12R, 12G, and 12B. It is comprised as a shape part. By configuring the translucent resin layer 12W as a convex portion in this way, the liquid crystal layer thickness in the reflective display region R is configured to be smaller than the liquid crystal layer thickness in the transmissive display region T. Specifically, the protruding amount of the translucent resin layer 12W is adjusted so that the thickness of the liquid crystal layer in the reflective display region R is half the thickness of the liquid crystal layer in the transmissive display region T. In this case, the translucent resin layer 12W is made of an acrylic resin.

Next, on the color filter 12, a counter electrode (common electrode) 25 is disposed in a solid form on the entire surface of the substrate through a planarizing film 24 made of a translucent resin. The counter electrode 25 in this case
Like the pixel electrode 9, is made of a translucent conductive material such as ITO. An alignment film 26 made of a polyimide film similar to the alignment film 16 of the TFT array substrate 10 is disposed on the counter electrode 25 on the liquid crystal layer 50 side.

On the other hand, a backlight (illumination device) 40 is disposed on the inner surface side of the liquid crystal panel 1 a having a configuration in which the liquid crystal layer 50 is sandwiched between the pair of substrates 10 and 20, that is, on the side different from the observation side of the liquid crystal display device 1. Has been. In the liquid crystal display device 1, transmissive display is provided using the light from the backlight 40, and reflective display is provided using external light or the like entering from the observation side.

Here, the data line driving circuit 201 shown in FIG. 1 includes sub-pixels 41 (41R, 41G,
41B, 41W), and the following three drive modes can be selected.
(1) A transmissive / reflective mode in which all the sub-pixels 41R, 41G, 41B, 41W are driven to operate as a transmissive / reflective panel.
(2) A transmissive mode in which the sub-pixels 41R, 41G, and 41B in the transmissive display area T are driven to operate as a transmissive panel.
(3) A reflection mode in which the sub-pixel 41W in the reflection display region R is driven to operate as a reflection panel.
In the transmissive / reflective mode, transmissive display is provided in a dark place and reflective display is provided in a bright place.

In particular, when operating in the reflective mode, the backlight 40 is turned off (turned off), and the refresh rate for updating the display data is set lower than when operating in the transmissive mode or the transmissive / reflective mode. This is because illumination light is not required at the time of reflection, and there are no problems even if the refresh rate is lowered because reflection monochrome display has many still images and monotonous moving image displays.

Note that the liquid crystal display device 1 of the present embodiment is configured as normally black, and performs black display in a state where no charge is applied to the liquid crystal layer 50.
During operation in the reflective mode, the sub-pixels 41R, 41G, and 41B in the transmissive display region T are set in a non-driven state (injected charge off state) so that no charge is applied to the liquid crystal layer 50. Display is supposed to be performed.
Further, during operation in the transmissive mode, the sub-pixel 41W in the reflective display region R is in a non-driven state (injected charge off state), no charge is applied to the liquid crystal layer 50, and black display is performed in the reflective display region R It is said.

According to the liquid crystal display device 1 of the present embodiment as described above, the transmissive display region T and the reflective display region R.
Since each is composed of separate sub-pixels 41, transmission and reflection can be displayed separately under optimum conditions. In addition, unlike the case where the transmissive display area T and the reflective display area R are arranged in the same subpixel, each display area T, R is composed of separate subpixels. , R sub-pixel structures can be arbitrarily optimized, and optical characteristics can be optimized for transmission and reflection displays.

Further, since each display area T, R is composed of separate sub-pixels 41, in either the transmission or reflection display mode, the sub-pixels 41R, 41R, 41
41G and 41B (41W) are in a driving state, and the sub-pixel 4 in the other display region R (T).
If 1W (41R, 41G, 41B) is set to a non-driven state, it is possible to reduce power consumption. Further, switching between the transmission mode and the reflection mode is performed for each of the sub-pixels 41R, 41G, 41.
Since it can be realized by driving B and 41W, it is possible to switch between transmission and reflection display according to the environment (state of external light). In addition, the problem of color mixing that may occur when the transmissive display region T and the reflective display region R are arranged in the same subpixel can be avoided, and reflected light is visually recognized during transmission or transmitted light is visually recognized during reflection. Problems such as a decrease in contrast can also be avoided.

As mentioned above, although one Embodiment of this invention was described, the following modifications can be provided suitably. For example, in the present embodiment, the sub-pixels 41 are configured with the same area, but are not necessarily configured with the same area. For example, when the reflective monochrome display is used preferentially, the reflective sub-pixel 41W may be configured to be large. The color of the reflective display is monochrome display in the present embodiment, but can be configured as a monocolor display. In order to save energy and improve brightness, the monochrome display as in the present embodiment is preferable. In this case, it is difficult for the transmissive display to be colored in the transmissive / reflective mode. Furthermore, the arrangement of the sub-pixels 41R, 41G, 41B, and 41W in the pixel A is not limited to the parallel arrangement as shown in FIG. 4, but may be a square arrangement as shown in FIG.

On the other hand, in the liquid crystal display device 1, the sub-pixels 41R, 41G, 41B, and 41W in one pixel A may be time-division driven using one source driver output. Specifically, as shown in FIG. 6A, in the transmissive / reflective mode, the sub-pixels 41R, 41G, and 41B in the transmissive display region T and the sub-pixel 41W in the reflective display region R are connected with one source output 201a. As shown in FIG. 6B, in the transmissive mode, the sub-pixels 41R, 41G, and 41B in the transmissive display area T are time-division driven with one source output 201a in the transmissive mode, as shown in FIG. 6C. Thus, in the reflective mode, only the sub-pixel 41W in the reflective display region R can be time-division driven with one source output 201a. By adopting such time-division driving, it becomes possible to reduce the number of outputs of the source driver, and by not selectively driving subpixels that do not contribute to display, the margin for writing data to the subpixels that contribute to display is widened. Is possible.
In addition, as shown in FIG. Each sub-pixel 41 for A2 has one source output 20
1a can be time-division driven, and in some cases, each sub-pixel for three pixels can be time-division driven by one source output.

[Electronics]
Next, the electronic apparatus of the present invention will be described. FIG. 8 is a perspective view showing a mobile phone as an example of the electronic apparatus according to the present invention. This cellular phone 1300 includes the liquid crystal display device of the present invention as a small-sized display portion 1301 and includes a plurality of operation buttons 1302, a mouthpiece 1303, and a mouthpiece 1304. Since this electronic apparatus includes the above-described liquid crystal display device of the present invention, vivid color display is possible in the transmission mode, and bright monochrome display is possible in the reflection mode.

The liquid crystal display device of the above embodiment is not limited to the mobile phone, but is an electronic book, a personal computer, a digital still camera, a liquid crystal television, a viewfinder type or a monitor direct view type video tape recorder, a car navigation device, a pager, Electronic notebook,
It can be suitably used as an image display means for devices such as calculators, word processors, workstations, videophones, POS terminals, touch panels, etc. In any electronic device, it is bright, has high contrast, and has a wide viewing angle. Transmission / reflection display is possible.

The preferred embodiment of the present invention has been described above with reference to the accompanying drawings.
It goes without saying that the present invention is not limited to such examples. Further, the shapes and combinations of the constituent members shown in the above-described examples are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention. In the present invention, it is sufficient that at least the transmissive display region T and the reflective display region R are composed of sub-pixels that are independently driven, and other configurations can be arbitrarily set. For example, a switching element is formed with a thin film diode instead of a thin film transistor, or a color filter is mounted on a lower substrate (T
It can also be arranged on the FT array substrate side. In the reflective display region R, the pixel electrode 9 is formed on the reflective film 13, but the reflective film 13 can also be used as the pixel electrode, for example. Further, in the above-described embodiment, an example in which the present invention is applied to a TN mode liquid crystal display device has been described. However, the present invention is applied to an STN liquid crystal display device and further to other liquid crystal display devices. It is also possible.

The cross-sectional schematic diagram and the plane schematic diagram of the whole liquid crystal display device which concern on one Embodiment of this invention. FIG. 6 is a circuit configuration diagram of a subpixel of a liquid crystal display device. FIG. 6 is a schematic cross-sectional view of a pixel region of a liquid crystal display device. The plane schematic diagram about the pixel region of a liquid crystal display. The plane schematic diagram which shows a modification about the arrangement | sequence of a sub pixel. Explanatory drawing which shows some examples about the time division drive by a source output. Explanatory drawing which shows a different example about the time division drive by a source output. FIG. 14 is a perspective view illustrating an example of an electronic device of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device (liquid crystal device), 1a ... Liquid crystal panel, 10 ... TFT array substrate (substrate)
20 ... counter substrate (substrate), 50 ... liquid crystal layer, 41R, 41G, 41B, 41W ... sub-pixel, A ... pixel, T ... transmissive display area, R ... reflective display area

Claims (10)

A liquid crystal device comprising a liquid crystal panel having a liquid crystal layer sandwiched between a pair of substrates,
Comprising a plurality of sub-pixels each corresponding to a different color;
Each of the pixels is provided with a transmissive display area for performing transmissive display and a reflective display area for performing reflective display.
The transmissive display area is composed of a plurality of the sub-pixels, while the reflective display area is composed of the sub-pixels separate from the transmissive display area. 2. The liquid crystal device according to claim 1, wherein full-color display is performed in the transmissive display area, and mono-color display or monochrome display is performed in the reflective display area. A source driver that controls the amount of charge injected into each of the sub-pixels;
The source driver drives the sub-pixels in the transmissive display area and the reflective display area to drive the sub-pixels disposed in the transmissive display area. 3. The liquid crystal according to claim 1, wherein a transmissive mode for performing transmissive display and a reflective mode for performing reflective display by driving a sub-pixel disposed in the reflective display region can be selected. apparatus. 4. An illumination device for irradiating the liquid crystal panel with illumination light is disposed on the opposite side of the liquid crystal panel from the observation side, and the illumination device is turned off in the reflection mode.
The liquid crystal device according to 1. 5. The liquid crystal device according to claim 3, wherein, in the reflection mode, a refresh rate for updating display data is set lower than that in the transmission / reflection mode or the transmission mode. 6. The liquid crystal device according to claim 3, wherein in the reflection mode, the display of the sub-pixels disposed in the transmissive display region is black display. 7. The liquid crystal device according to claim 3, wherein in the transmissive mode, the display of the sub-pixels disposed in the reflective display region is black display. 8. The liquid crystal device according to claim 3, wherein each of the sub-pixels in one pixel is time-division driven using one of the source drivers. 9. A color filter layer including a colored layer is disposed on the liquid crystal layer side of at least one of the pair of substrates.
The color filter layer in the transmissive display area is provided with a colored layer having a different color for each of the sub-pixels, while the color filter layer in the reflective display area has a colored layer or A colorless translucent layer is disposed,
A colored layer or a colorless light-transmitting layer in the reflective display region is formed to protrude toward the liquid crystal layer with respect to the colored layer in the transmissive display region, and the liquid crystal layer thickness in the reflective display region is larger than the liquid crystal layer thickness in the transmissive display region. 9. The liquid crystal device according to claim 1, wherein the liquid crystal device is configured to be small. An electronic apparatus comprising the liquid crystal device according to claim 1.

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