JPS59151196A - Display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] fa) Technical Field of the Invention The present invention relates to a display device such as a thin film EL display panel,
In particular, the present invention relates to a new driving method in which a display screen is divided into a plurality of display areas and each area can be driven in a time-division manner using a common address 1-time.

(b) Prior Art and Problems AC-driven EL display devices are already well known as Furano 1-type and all-solid-state display devices, but generally,
A group of transparent data electrodes in the X direction is formed on a transparent glass substrate, an EL layer sandwiched between insulating layers on both sides is placed on top of the transparent data electrode group, and a group of metal scanning electrodes in the Y direction is arranged on the upper insulating layer. It is constructed as a multilayer thin film panel. When driving such a thin film EL display panel, first, while selectively scanning the Y-side scanning electrode with a primary scan pulse, the X-side data electrode corresponding to the light emitting point to be displayed on the selected scanning electrode is moved. Selectively apply a data pulse from , perform address operation so that the combined voltage at the selected light emitting point becomes approximately the saturated brightness voltage, and then apply the data pulse and data selectively to Normally, an address pulse resulting from a combination of pulses and a glue refresh pulse of opposite polarity are commonly applied to the entire surface to cause a selected light emitting point to emit light repeatedly.

By the way, in order to perform the above-mentioned drive, conventionally,
While a data address driver was connected to each of the direction data electrodes, a scan driver was also connected to each of the Y direction scan electrodes to sequentially scan the entire screen in a line-at-time manner. A problem has arisen in that the structure of the address circuit (drive circuit) on both the side and the motor side is complicated and expensive.

(C) Object of the Invention An object of the present invention is to provide a display device constructed using a driving method that allows the number of required driving circuits to be reduced.

(dl Structure of the Invention The present invention is characterized by having a plurality of scanning electrodes and a plurality of data electrodes extending in a direction intersecting the scanning electrodes, and having both display surfaces constituted by an array of light emitting points determined at the intersection of these two electrodes. A transmissive light shutter that becomes transparent by applying or removing a voltage is provided on the display panel, and the display panel and the light shutter film are divided into a plurality of sub-regions, and the display screen is dividing the display area into display areas corresponding to sub-areas, and connecting at least one of the scanning electrodes and data electrodes having the same order in the sub-area to a common drive circuit; A drive circuit capable of selectively driving each of the sub-areas is provided, and the drive circuits for the scanning electrodes and data electrodes perform scan operations and data address operations corresponding to display information to be added to the selected display area. is added to each display area in common, and a desired display area is selected by operating the driving circuit of the optical shutter film.

(e) Examples of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the structure of a conventional matrix type display panel, in which 1.1 is a display element, 2 and 2' are display electrodes, and 3 is a drive circuit. As is clear from the figure, the conventional drive system required the same number of drive circuits as the number of display electrodes, that is, the number of lines.

On the other hand, in this embodiment, as seen in the perspective view showing the main part configuration in FIG. (This example shows an example in which the area is divided into two equal parts) to provide sub-areas A to D having the same configuration. And the matrix type display element 1
On top, a transparent film 4 made of a transmissive liquid crystal that becomes transparent when an electric field is applied is formed, and driving electrodes (not shown) for this are arranged corresponding to each of the sub-regions Δ to D. However, by providing one liquid crystal drive circuit 5 for each of them, the optical shack film 4 is also divided into sub-areas A to D. The display electrodes 2 and 2° of the display element 1 are also divided into subgroups corresponding to the subareas A to D, and the display electrodes corresponding to the positions in each subgroup are connected in common, and each of them is divided into one subgroup. Connect to drive circuit 3.

In this embodiment configured in this way, the light shutter film 4 can be adjusted by selecting a desired one from among the liquid crystal drive circuits 5.
The sub-regions A to D of the display element 1 are selectively made transparent, so that the display element 1
The number of fIDs required for the drive circuit 3 is reduced.

Next, the operation of this embodiment configured as described above will be explained with reference to FIGS. 3 to 5.

FIG. 3 and FIG. 4 are principal part plan views showing the configurations of the display element 1 and the optical shutter film 4 of this embodiment, respectively. The display element 1 has a Y-direction display electrode 2 of <n 1fAI as described above.
and m X-direction display electrodes 2' (the figure shows an example of 4 for both n and m). For example, the Y direction display electrode EY and EY5. X direction display electrode EX, and EX5
are short-circuited and connected to one drive circuit, for example, the former to the drive circuit DY1 and the latter to the drive circuit DX. The optical shutter film 4 formed in -Jl of this display element 1 is also sub-region A-.
D, each having a liquid crystal drive circuit DA.

DI3. ’　Connect to DC and DD.

FIG. 5 is a timing chart for explaining the operation of this embodiment configured as described above. In this embodiment, the display electrodes BY and .about.Ey8 in the Y direction are used as row selection lines, and the display electrodes EX and .about.EX8 in the X direction are used as data lines. Therefore, it is assumed that the drive circuits DY, .about.DY4 send out the row selection signal 7, and the drive circuits DX, .about.DX8 send out data.

First, the first drive circuit DA of the optical shutter film 4 is activated, and an electric field is applied to a sub-region of the optical gloss film 4 to make that region transparent. In parallel with this, the Y-direction drive circuits DY to DY4 of the display element 1 are sequentially activated to operate the display electrodes EY and EYo, then EY2 and EY6 . Then E
Y3 and BY? .

Next, a voltage is sequentially applied to EY4 and EY.

1 in synchronization with the operation of the drive circuits DY, ~DY, in each Y direction.
, Although not shown, the drive UJ circuits DX1 to D in the X direction
Parallel signals are sent from X4 to the display electrodes EX, .about.EXs, and the ON points in both the X and Y directions emit light.

Assuming that D Y + and DX are on, the intersection of EYI and EXI in sub-area A emits light. Furthermore, in other sub-areas B-D, EY and EX5
．． EY5 and EXI.

The intersection of EY5 and EX5 also emits light at the same time. However, in the light shutter 4, only the sub-area A is transparent and the other three sub-areas B-D are opaque as described above, so the light emitted at the intersection of EY and EX is displayed on the outer RIJ, and the other three sub-areas B-D are opaque. The light emission from the three points is blocked by the opaque light shield film 4 and is not displayed externally.

When the scanning of the driving circuits DY and DY4 in the Y direction is completed in this way, the driving circuit L) A of the optical shutter film 4 is turned off, and the optical shutter 11% of the sub-area A is made transparent. The next drive circuit DB is turned on and the sub-area B is made transparent. Then, as mentioned above, the drive circuits DY, ~DY
4 sequentially and the X direction drive circuit D
By sending data from ~DX4, display in sub-area B is performed. Below, perform the same operation in sub-area C1.
Next, by performing the process on the sub-region (2), it is possible to perform the desired display over the entire screen of the display element 1.

As mentioned above, the conventional display panel configuration requires one driver circuit, the same number as the total of 2.2'' display electrodes in the Y direction and the X direction. Therefore, in the case of a display panel equivalent to the one embodiment described above, 16 driving circuits are required in the conventional configuration. In contrast, in this embodiment, there are a total of 8 drive circuits for the display element 1 and 4 flilli liquid crystal drive circuits, for a total of 12 drive circuits.
One piece is fine. In this way, according to this embodiment, the required number of drive circuits is reduced. In the above embodiment, the number of display electrodes is eight in each of the X and Y directions, but as the display panel becomes larger, the effect of reducing the number of drive circuits becomes even greater. For example, if the number of display electrodes is 100 in each direction, the conventional configuration requires 200 drive circuits. On the other hand, if the present invention is used, if the X direction and the Y direction are each divided into 10 equal parts, there will be 1, 20 drive circuits for the display element 1, and 20 drive circuits for the liquid crystal, and the required number of drive circuits is Total 4
0 (fl! is fine.

In addition to the above drive circuit, driving the display element 1 generally requires a high voltage, so that drive circuit is also expensive, but since a low voltage is sufficient to drive the liquid crystal, this drive circuit is used to drive the display element. It is cheaper than the l-way. Therefore, in this embodiment, not only the number of drive circuits is reduced, but also a portion of the required number may be an inexpensive low-voltage drive circuit, so that the cost of the drive circuit is further reduced.

Note that in carrying out the present invention, the display element 1 is an EL
, a light-emitting element such as FDP, a liquid crystal, a non-light-emitting element such as an electrochromic, and a transmissive element such as a liquid crystal or an electrochromic as the optical shack film.

(f) As described in detail, according to the present invention, the number of drive circuits can be reduced without reducing the number of drive circuits, and the cost of drive circuits can be reduced.

4. Simplified drawing 144. Figure 1 is a plan view showing the structure of a conventional display panel, Figure 2 is a perspective view showing an embodiment of the present invention, and Figures 3 and 4 are exploded views of Figure 2. The top view and FIG. 5 are timing charts for explaining the operation of the above embodiment.

In the figure, 1 is a display element, 2 and 2' are display electrodes, and 3
4 is a drive circuit for the display electrode, 4 is a light shutter film, 5 is a drive circuit for the light shutter film 4, A-D is a sub-area, D A-D
I) is a drive circuit for each sub-region of the optical film 4, DX1~
1] X4 and DY, ~DY4 are display electrode drive circuits, E
xt to Exs and EY, -EY8 indicate display electrodes.

Figure 1 No.? Flash

Claims (1)

[Claims] A voltage is applied or removed on a display panel having a plurality of scan electrodes and a plurality of data electrodes extending in a direction intersecting the scan electrodes, and a display screen configured with an array of light emitting points determined at the intersections of these two electrodes. A transmissive light shutter film that can be made transparent is provided, the display panel and the light shutter film are divided into a plurality of sub-areas, and the display screen is divided into display areas corresponding to the sub-areas; At least one of the scan electrodes and data electrodes having the same rank in the sub-region is connected to a common drive circuit, and a drive circuit is provided that can selectively drive each sub-region of the light shutter film. , by operating the drive circuits of the scan electrode and data electrode to commonly add a scan operation and a data address operation corresponding to the display emotion to be added to the selected display area to the name display area; A display device characterized in that it is configured to select a desired display area by operating a drive circuit.