JPH06347750A - Non-light emitting type display device and driving method therefor - Google Patents

Non-light emitting type display device and driving method therefor

Info

Publication number
JPH06347750A
JPH06347750A JP14040793A JP14040793A JPH06347750A JP H06347750 A JPH06347750 A JP H06347750A JP 14040793 A JP14040793 A JP 14040793A JP 14040793 A JP14040793 A JP 14040793A JP H06347750 A JPH06347750 A JP H06347750A
Authority
JP
Japan
Prior art keywords
display device
non
signal
black level
emissive display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP14040793A
Other languages
Japanese (ja)
Inventor
Yojiro Matsueda
洋二郎 松枝
Original Assignee
Kodo Eizo Gijutsu Kenkyusho:Kk
株式会社高度映像技術研究所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kodo Eizo Gijutsu Kenkyusho:Kk, 株式会社高度映像技術研究所 filed Critical Kodo Eizo Gijutsu Kenkyusho:Kk
Priority to JP14040793A priority Critical patent/JPH06347750A/en
Publication of JPH06347750A publication Critical patent/JPH06347750A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To substitute a signal of a black level for the peripheral part of a black matrix by impressing the signal of a black level to the peripheral pixel in the region of picture display in a non-light-emitting type display device. CONSTITUTION:The number of dots of a pixel array is made larger than the number of displaying dots and a signal of a black level is inserted before and after a picture signal by utilizing a vertical blanking period and a horizontal blanking period. Alternatively, an exclusive driving circuit is connected to a pixel array on the periphery in advance and a signal of a black level is always impressed in stead of the picture signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-emissive display device using a dot matrix and a driving method thereof.

[0002]

2. Description of the Related Art In a conventional non-emissive display device using a dot matrix, it is necessary to cover the periphery of the display area with a light shielding portion as shown in FIG. This is to make the boundary between the display screen and other areas clear and maintain the contrast ratio of the display screen. Generally, the non-emissive display device has an opening 11
In order to cover the surroundings with the light-shielding portion 12, this light-shielding portion is often extended to form a partition around the display area.

For example, in the case of a liquid crystal display device in which a liquid crystal material is enclosed between two transparent substrates, since the liquid crystal is not partitioned for each dot, the area where the liquid crystal is enclosed must be made sufficiently larger than the dot matrix area. I won't. if,
If such a liquid crystal display device is not closed, the liquid crystal other than the dot matrix region also transmits light. Therefore, one of the transparent substrates needs to be divided as shown in FIG.

[0004]

Generally, in a non-emissive display device, the brightness of the display screen depends on the area of the opening of the light shielding layer. Therefore, in order to obtain a brighter screen, the area of the light shielding portion should be minimized. There is a need to. The method of obtaining the brightest screen is to eliminate the light-shielding layer, but if the above-mentioned cutoff is eliminated, light leaks from the peripheral area of the screen, resulting in a problem that the image quality is significantly impaired.

A non-emissive display device and a driving method thereof according to the present invention solve such a problem, and an object thereof is to provide a light-shielding portion which is a part of the periphery of a display screen without using a light-shielding layer. Is to be provided.

[0006]

According to the present invention, in a non-emissive display device in which transmitted light is controlled by a dot matrix, the dot matrix portion comprises an area for displaying an image and two areas for constantly displaying a black level, It is characterized in that an area for constantly displaying the black level is arranged around the area for displaying the image.

According to another aspect of the present invention, in a method for driving a non-emissive display device in which transmitted light is controlled by a dot matrix, an image display signal is set to a black level for a certain period in one vertical scanning period and one horizontal scanning period. It is characterized by keeping at.

[0008]

In the non-emissive display device and the driving method thereof according to the present invention described above, the dot matrix portion is composed of an area for displaying an image and two areas for always displaying a black level, and leaks from the periphery of the image display portion. Block the light.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a plan view showing a non-emissive display device according to an embodiment of the present invention. In this embodiment, a dot matrix having a number larger than the number of display dots is arranged in advance, and the surrounding black and white rows are always displayed in black level. By doing so, a black light-shielding portion composed of the non-display pixels 2 is formed in the periphery of the display pixel 1, so that it is possible to divide the periphery of the display region without using the light-shielding layer as shown in FIG. Therefore, a bright screen can be obtained without impairing the image quality.

Next, a method of driving such a non-emissive display device will be described.

FIG. 3 shows an example of drive signals for the non-emissive display device according to this embodiment. In a non-emissive display device driven by AC such as a liquid crystal display device, the image signal Vid has a positive / negative symmetrical waveform around the reference potential Vc. In this example, one horizontal scanning period T4 starts T4a and ends T4c.
The black level signal is applied for two periods.

The image display data written by each scanning line is applied during the period T4b. When the number of scanning lines displaying an image is M, such a signal is repeated M times during the period T2.

On the other hand, the black level signal is applied also during the periods T1 and T3 before and after T2. The time between T1 and T3 is
The number of scanning lines of non-display pixels provided above and below the screen and used as a parting line needs to be equal to or longer than one horizontal scanning period. By changing the time of these black levels, it is possible to change the number of non-display pixels that are cut off, so that the size of the screen can be freely changed.

In order to use this driving method, it is necessary to change the signal of the conventional liquid crystal display device, but as another method, a driving circuit dedicated to a signal line or a scanning line connected to a non-display pixel in advance is used. You can also connect. For example, in the vertical bright line erasing period, the pixels in the upper and lower portions may be selected all at once to apply the black level signal, and the left and right signal lines may always be applied with the black level signal. In such a case, the drive signal for the display area may remain unchanged.

FIG. 4 is an example of a plan view of a pixel portion of a thin film transistor (hereinafter abbreviated as TFT) liquid crystal display device which is a typical non-emissive display device. In this figure, the signal line 41 and the scanning line 42 are made of a metal thin film or a refractory metal thin film and are opaque. The pixel electrode 44 is made of a transparent conductive film. The TFT 43 functions as a switch, and when the selection pulse is applied to the scanning line 42, the image display signal of the signal line 41 is written in the pixel electrode 44.

Here, since the peripheral portion of the pixel electrode 44 overlaps the signal line 41 and the scanning line 42, the signal line and the scanning line function as a light shielding layer. In the display device having such a structure, if the pixels in the peripheral portion are set to the black level as shown in FIG. 1, all the light in the parting portion is blocked.

Further, since the signal line / scanning line and the pixel electrode are on the same substrate, the alignment can be performed with high accuracy and the area of the opening can be maximized. That is, the brightest screen is obtained.

[0019]

As described above, according to the non-emissive display device and the method of driving the same according to the present invention, it is possible to form a parting around the image display portion without providing a light shielding layer. You can get the brightest screen without any loss.

Moreover, since the light-shielding layer is not required, the structure of the display device is simpler than the conventional one, and the cost can be reduced.

In the case of a liquid crystal display device, the difference in electric field between the display area and the non-display area causes deterioration of the liquid crystal material. However, in the present invention, the non-display area is driven similarly to the display area. , Such problems do not occur. That is, the reliability of the display device can be improved.

[Brief description of drawings]

FIG. 1 is a plan view of a non-emissive display device according to an exemplary embodiment of the present invention.

FIG. 2 is a plan view showing a conventional non-emissive display device.

FIG. 3 is a waveform diagram showing a driving method of a non-emissive display device.

FIG. 4 is a plan view of a TFT liquid crystal display device according to an embodiment of the present invention.

[Explanation of symbols]

 1 Display Pixel 2 Non-Display Pixel 11 Opening 12 Light Shading 41 Signal Line 42 Scanning Line 43 TFT 44 Pixel Electrode

Claims (7)

[Claims]
1. In a non-emissive display device in which transmitted light is controlled by a dot matrix, a dot matrix portion is composed of an area for displaying an image and two areas for always displaying a black level, and the periphery of the area for displaying the image. A non-emissive display device characterized in that an area for always displaying the black level is arranged in the area.
2. The non-emissive display device according to claim 1, wherein the non-emissive display device is a liquid crystal display device in which a liquid crystal material is sandwiched between two substrates.
3. The non-emissive display device comprises a plurality of signal lines and scanning lines on a first insulating substrate, and thin film transistors and pixel electrodes arranged at intersections thereof, and a second insulating substrate is provided. The non-emissive display device according to claim 2, wherein an active matrix liquid crystal display device having a common electrode is formed.
4. The signal line and the scanning line are made of an opaque metal thin film or a refractory metal thin film, and at least a part of the periphery of the pixel electrode overlaps the signal line or the scanning line. The non-emissive display device according to claim 3.
5. The non-emissive display device according to claim 4, wherein a channel portion of the thin film transistor overlaps the signal line.
6. A method for driving a non-emissive display device in which transmitted light is controlled by a dot matrix, wherein an image display signal is set to 1
A method for driving a non-emissive display device, characterized in that a black level is maintained for a certain period in each of the vertical scanning period and one horizontal scanning period.
7. A case where the image display signal gives a black level signal before and after a signal of a display image in one horizontal scanning period and a case where a black level signal always gives one horizontal scanning period The second party is M times in one vertical scanning period, and the second party is one or more times before and after the second party, where M is the number of scanning lines for displaying an image. A method for driving a light emitting display device.
JP14040793A 1993-06-11 1993-06-11 Non-light emitting type display device and driving method therefor Pending JPH06347750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14040793A JPH06347750A (en) 1993-06-11 1993-06-11 Non-light emitting type display device and driving method therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14040793A JPH06347750A (en) 1993-06-11 1993-06-11 Non-light emitting type display device and driving method therefor

Publications (1)

Publication Number Publication Date
JPH06347750A true JPH06347750A (en) 1994-12-22

Family

ID=15268041

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14040793A Pending JPH06347750A (en) 1993-06-11 1993-06-11 Non-light emitting type display device and driving method therefor

Country Status (1)

Country Link
JP (1) JPH06347750A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7123213B2 (en) 1995-10-05 2006-10-17 Semiconductor Energy Laboratory Co., Ltd. Three dimensional display unit and display method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63276031A (en) * 1987-05-08 1988-11-14 Hitachi Device Eng Co Ltd Liquid crystal display device
JPH01180526A (en) * 1988-01-12 1989-07-18 Seiko Epson Corp Liquid crystal display device
JPH04307521A (en) * 1991-04-04 1992-10-29 Seiko Epson Corp Wiring structure for thin film transistor device and its production

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63276031A (en) * 1987-05-08 1988-11-14 Hitachi Device Eng Co Ltd Liquid crystal display device
JPH01180526A (en) * 1988-01-12 1989-07-18 Seiko Epson Corp Liquid crystal display device
JPH04307521A (en) * 1991-04-04 1992-10-29 Seiko Epson Corp Wiring structure for thin film transistor device and its production

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7123213B2 (en) 1995-10-05 2006-10-17 Semiconductor Energy Laboratory Co., Ltd. Three dimensional display unit and display method
US8242974B2 (en) 1995-10-05 2012-08-14 Semiconductor Energy Laboratory Co., Ltd. Three dimensional display unit and display method
US8711062B2 (en) 1995-10-05 2014-04-29 Semiconductor Energy Laboratory Co., Ltd. Display unit and display method

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