JPH09114425A - Display device and display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display method improved in vertical resolution. SOLUTION: A second field is started at a stage in which a first field is completed while maintaining the information written in the first field. Then, the first field of the next frame is started at a stage in which the second field is completed while maintaing the information written in the second field. Moreover, two fields are constituted of different picture forming devices and formed pictures are projected being composited. The vertical resolution is enhanced by executing such operations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention disclosed in this specification relates to a display method in an active matrix type display device represented by an active matrix type liquid crystal display device.

[0002]

2. Description of the Related Art Conventionally, an active matrix type liquid crystal display device has been known. This has a configuration in which a thin film transistor for switching or a non-linear element is arranged in each of the pixels arranged in a matrix, and the electric charge flowing in and out of the pixel electrode is controlled.

Generally, as a display method in an active matrix type liquid crystal display device, a display method in which one frame is divided into a first field and a second field is used. In this method, as shown in the timing chart of FIG. 1, for pixels arranged in a matrix of m rows and n columns as shown in FIG. 4, information is first written in odd rows, that is, information is written. Is displayed, and this is set as the first field. Then, next, information is written to even-numbered rows, and this is set as the second field. Thus, one frame is composed of the first field and the second fold.

Specifically, in the matrix area of FIG. 4, information is not sequentially written to the rows (1,1), (2,1), (3,1) ,. 1,3), (2,3) ... The information is not sequentially written to the rows as the first field, and then (1,2), (2,2), (3,2) The sequential writing of information is not performed for the rows of ..., Further, the sequential writing of information is not performed for the rows of (1,4), (2,4). Then, one frame ends when the writing of information is completed for all the pixels. Display is performed by repeating this frame 30 times per second.

The above-mentioned method is adopted in order to suppress the flicker that occurs when a bright screen is displayed. This flicker feeling is felt when the vertical scanning time is long. Therefore, by constructing one frame with two fields as described above, the apparent vertical scanning time is halved, and the flicker feeling is suppressed.

There is also a reason that the above method is adopted in order to reduce the amount of information required for one frame.

However, in the display by the above-mentioned method, since the number of scanning lines becomes 2 / n, the vertical resolution is lowered.

In particular, in the method of displaying by projecting a large screen like a projector, other fields which are not displayed are displayed,
There is a problem that the non-display part is observed. This is a major factor in reducing the vertical resolution.

[0009]

SUMMARY OF THE INVENTION It is an object of the invention disclosed in the present specification to provide a configuration in which the vertical resolution does not deteriorate even when the scanning method as described above is adopted.

[0010]

One of the inventions disclosed in the present specification has means for projecting images divided into two groups on a projection surface in an overlapping manner, and the projected images are arranged in a matrix. It is composed of pixels to be arranged, N is an odd number shown by 1, 3, 5 ... And the Nth row is formed by the image of one group on the projection plane, and the N + 1th row is formed by the other. Is performed on images of the group.

A specific example of the above configuration is shown in FIG. FIG.
2 shows a structure in which six images formed by the six active matrix regions shown in FIG. 2 are divided into two groups and the images are projected from the optical system 508 on the screen 510 in an overlapping manner.

The display device shown in FIG. 3 is provided with an integrated liquid crystal panel 507 whose outline is shown in FIG. 50
In the integrated liquid crystal panel shown in FIG.
The image of the Nth row, for example, is formed in the active matrix regions indicated by 1 to 203. And 204
N + 1 in the active matrix area indicated by 206
The image of the line is formed.

According to another aspect of the invention, there is provided a display device in which one frame is composed of a first field and a second field, the image forming means forming the first field, and the first field. Image forming means for forming two fields.

As a specific example of the above configuration, the configuration shown in FIG. 1 can be cited. In the configuration shown in FIG. 1, the first field is formed in the active matrix regions 201-203, and 204-206.
A second field is formed in the active matrix region shown by.

In particular, as shown in FIG. 1, one image forming means writes information (displays an image) in the period shown in the first field, and when the writing is finished, the other image forming means makes the first writing. The image of the second field is formed. At this time, while the display of the second field is being performed, the image of the first fall is kept as it is. Then, the apparent vertical resolution can be increased.

Another structure of the invention is a method of writing information in each pixel of a display screen arranged in a matrix,
The images divided into two groups are combined and projected, and N is 1, 3,
It is characterized in that the Nth row is formed by the image of one group and the N + 1th row is formed by the image of the other group on the projection plane as an odd number indicated by 5 ...

According to another aspect of the invention, in a display method in which one frame is composed of a first field and a second field, the first field and the second field are formed by different image forming apparatuses. Is characterized by.

[0018]

【Example】

[Embodiment 1] An outline of an integrated liquid crystal panel used in this embodiment is shown in FIG. The configuration shown in FIG.
It has a function of forming a first image of RGB in the active matrix area indicated by 203 and forming a second image of RGB in the active matrix area indicated by 204 to 206.

Further, active matrix regions 201 to 2
The horizontal scanning of 03 is controlled by the horizontal scanning control circuit 207 arranged in common. Horizontal scanning of the active matrix areas 204 to 206 is controlled by a horizontal scanning control circuit 208 arranged in common.

Further, the horizontal scanning control circuits 207 and 208 are controlled in timing of their operations at the timing of vertical scanning, and operate so as to form images of the first field and the second field. That is, the image formed in the active matrix regions 201 to 203 forms the first field of FIG.
The image formed at 206 forms the second field of FIG. Then, one frame is formed by the first field and the second field.

Further, active matrix regions 201 and 2
04 are commonly controlled by the vertical scanning control circuit 209. In addition, active matrix areas 202 and 205
Are commonly controlled by the vertical scanning control circuit 210. Further, the active matrix areas 203 and 206 are
It is commonly controlled by the vertical scanning control circuit 211.

With such a structure, the structure of the liquid crystal panel can be simplified, and its production cost and reliability can be increased.

In the configuration shown in FIG. 2, the circuit indicated by 102 is a flip-flop circuit. This circuit has a function of keeping one of the two states stable.

For example, when the rising edge of the operation clock signal is input while the input level is H, the output level becomes H. If the rising edge of the operation clock signal is input when the input level is L, the output level is L
Becomes Then, these states are maintained unless the next rising edge of the operation clock signal is input.

In the configuration shown in FIG. 2, first, VSTA is
An H level signal (vertical scanning timing enable signal) is applied to the input of the flip-flop circuit. In this state, the rising edge of CLKV (operation clock of the vertical scanning control circuit) is input to the flip-flop circuit 102.

Then, in the flip-flop circuit 102, VSTA is punched out by CLKV, and the signal level of the gate line 103 becomes H level. That is, when the input of the flip-flop circuit 102 is at the H level and the rising edge of CLKV is input, the output of the flip-flop circuit 102 becomes at the H level.

When the gate signal line 103 becomes H level, the gate signal line 103 is arranged at the pixel at each address indicated by (0,0), (1.0), (2,0) ... (m, 0). Thin film transistor is ON
It will work.

In this state, in the flip-flop circuit 104, HSTA (horizontal scanning timing enable signal) is punched out at the rising edge of CLKH (horizontal scanning control circuit operation clock). As a result, the signal level of the image sampling signal line 105 becomes H.

Then, the sampling and holding circuit 106 takes in the image data, and the image data flows into the image signal line 107. In this state, (0,0),
Since all the thin film transistors in the row indicated by (1,0), (m, 0) ... Are ON operation, image data is written in the address indicated by (0,0).

Next, at the next rising edge of CLKH, the output of the flip-flop circuit 108 becomes H level,
The output of the flip-flop circuit 104 becomes L level.
That is, when the input section of the flip-flop circuit 108 (the output section of the flip-flop circuit 104) is at the H level, C
The input of the next rising edge of LKH changes the output of the flip-flop circuit 108 to the H level. At this time, the output of the flip-flop circuit 104 changes to L level.

As a result, the image sampling signal line 109
Becomes H level. Then, the sampling and holding circuit 110 further captures the image data and supplies the image data to the image signal line 111.

As a result, information is written at the address (1,0). In this way, information is sequentially written up to the pixel at the address (m, 0). In this way, information is written in the first row.

Next, the output of the next flip-flop circuit of the vertical scanning control circuit becomes H level, and (0,1), (1,1) ...
Information is written to the (m, 0) address. Then, at the stage when the writing of information up to the address (m, n) is completed,
Writing of the field information ends.

During the above operation, HSTA is not input to the horizontal scanning control circuit indicated by 208, and the operation is not performed. Therefore, the above operation is 201 to 203.
The same is done in the active matrix area indicated by.

When the writing of information to all the pixels in the active matrix area indicated by 201 to 203 is completed, the horizontal scanning control circuit 208 is controlled by the timing of VSTA (vertical scanning timing enable signal).
The HSTA signal is applied to the. Then, information is written in the first row of the active matrix regions 204 to 206.

Writing of this information is sequentially performed on all the pixels in the active matrix regions 204 to 206. As a result, the second fold information is written.

In this way, the information of the RGB fields is written alternately. When writing the information in this one field, the information written in the other fields is maintained. Therefore, the display is performed at the operation timing as shown in FIG.

In this way, the number of scanning lines in the vertical direction is not reduced, so that the vertical resolution can be increased.

Although FIG. 2 shows an example in which six active matrix regions are integrated, it is not possible to integrate the active matrix regions such as 2 × 1, 3 × 3, and 4 × 2. It is possible.

Generally, the number of active matrices is M × N.
When the number is set to be M, the total number of horizontal scanning control circuits and vertical scanning control circuits required is M + N. Such a structure, combined with the structure integrated on the same substrate, can bring significant advantages such as reduction in manufacturing cost and improvement in reliability.

[Embodiment 2] This embodiment is an example of a projection type display device using the integrated liquid crystal panel shown in FIG. FIG. 3 shows an outline of this embodiment. In FIG. 3, 5
Reference numeral 00 denotes a casing of the apparatus, and an image enlarged and projected from the inside is displayed on a screen 510 arranged in the casing 500.

Here, a configuration for viewing an image from the side opposite to the surface projected on the screen (generally called rear projection) is shown, but a configuration for viewing an image from the surface projected on the screen (generally a projection type). Also called projection), the basic configuration is the same except that the image is reversed. However, the projection type projection is different in that it is not integrated with the housing and the screen.

In the housing 500, an appropriate control circuit 5
11 is built in, and for example, image display control and selection between a two-dimensional image and a three-dimensional image are performed.

In FIG. 5, a light source 501 that emits white light.
The light from is first reflected by the half mirror 502,
GBR with dichroic mirrors 504, 505, 506
Is dispersed into light having a wavelength region corresponding to.

The light reflected by the mirror 503 is also B (blue) G by a dichroic mirror (not shown).
It is split into each wavelength region of (green) R (red). That is, by using two sets of RGB dichroic mirrors, two sets of R
GB rays (6 rays total) are generated.

These light rays are incident on the integrated liquid crystal panel 507 whose outline is shown in FIG. Then, two sets of RGB images formed by being optically modulated by the integrated liquid crystal panel 507 are projected from the optical system 508 to a screen (projection surface) 510 via a mirror 509, and are combined as a color image there. To be done.

The optical system 508 includes a lens system for magnifying projection and a polarization imparting means (usually a polarizing plate is used) used for stereoscopic display (three-dimensional display). In the case of ordinary two-dimensional display, this polarization imparting means merely functions as a light reducing means. Therefore, there is no particular obstacle other than lowering the display brightness. But,
If it is desired to increase the brightness in the two-dimensional display, this polarization imparting means may be mechanically removed from the optical path.

By using the display device as shown in this embodiment, a bright image can be displayed with high resolution.

[0049]

By adopting the method disclosed in the present specification, it is possible to obtain a structure having an increased vertical resolution.

[Brief description of the drawings]

FIG. 1 is a chart showing display timing.

FIG. 2 is a schematic diagram showing a configuration of an integrated liquid crystal panel.

FIG. 3 is a diagram showing an outline of a projection type display device.

FIG. 4 is a schematic diagram showing a pixel arrangement in a matrix area.

[Explanation of symbols]

 201, 202, 203 Active matrix area 204, 205, 206 Active matrix area 207, 208 Horizontal scanning control circuit 209, 210, 211 Vertical scanning control circuit 104, 108, 102 Flip-flop circuit 501 Light source 502 Half mirror 503 Mirror 504, 505 , 506 Dichroic mirror 507 Integrated liquid crystal panel 508 Optical system 509 Mirror 510 Screen 511 Control circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunpei Yamazaki 398 Hase, Atsugi-shi, Kanagawa Japan Semiconductor Energy Laboratory Co., Ltd.

Claims (8)

[Claims] 1. A means for projecting images divided into two groups in an overlapping manner on a projection surface, wherein the projected image is composed of pixels arranged in a matrix, and N is 1, 3, 5 ,. The display device is characterized in that the Nth row is formed by the image of one group and the N + 1th row is formed by the image of the other group on the projection plane as an odd number indicated by. 2. The display device according to claim 1, wherein the image on the (N + 1) th row is formed while the image on the Nth row is maintained. 3. An apparatus for performing display in which one frame is composed of a first field and a second field, wherein image forming means for forming the first field and the second field are formed. And an image forming unit for controlling the display device. 4. The display device according to claim 3, wherein the image of the second field is formed while the image of the first field is maintained. 5. A method for writing information in each pixel of a display screen arranged in a matrix, wherein images divided into two groups are combined and projected, and N is 1, 3, 5, ... A display method characterized in that the Nth row is formed on the image of one group and the N + 1th row is formed on the image of the other group on the projection plane as an odd number indicated by. 6. The display method according to claim 5, wherein the image of the (N + 1) th row is formed while the image of the Nth row is maintained. 7. A display method in which one frame is composed of a first field and a second field, wherein the first field and the second field are composed of different image forming apparatuses. Method. 8. The display device according to claim 7, wherein the image of the second field is formed while the image of the first field is maintained.