JPH02223986A - Display device - Google Patents

Abstract

PURPOSE:To always display an easy-to-see picture by converting picture data into such picture data that at least either the vertical or horizontal lines of the displayed picture in a display panel is displayed with thicker lines, and writing it into a display data storing means. CONSTITUTION:Plural picture elements are arranged in a matrix shape in the display panel 1. Under the control of a control circuit 2, the data of a picture, which is read out from the picture data generating means 3 and displayed, is converted into such that at least either the vertical or horizontal lines of the displayed picture in a display panel 1 is displayed with the thicker lines than that displayed based on the picture data stored in the picture and character generating means 3, and the converted data is written into the storing means 4. Thus, an easy-to-see picture can be displayed regardless of an angle to see the display panel 1, etc.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a display device.

[Prior Art] Conventionally, there are many matrix-type display panels in which a plurality of pixels made of liquid crystals, LEDs, etc. are arranged in a matrix on a display panel surface, and images and characters are displayed using these pixels. These display panels come in a variety of shapes, such as vertically and horizontally, depending on their installation location and display content, and their display states include static display, in which the displayed image remains stationary, and static display, in which the displayed image remains stationary. There are displays that are displayed in various display states, such as a so-called "flowing display" in which images are displayed flowing in a predetermined direction.

However, in conventional display devices, lines of images and characters are displayed with the same width both vertically and horizontally, regardless of the shape of the display device or the display state.

[Problem to be solved] As a result, when a horizontally long display panel is viewed diagonally from the side, the vertical lines of distant characters appear thin and difficult to recognize, and when a vertically long display panel is viewed from below, the information is There is a problem in that the horizontal lines of the characters appear thin and difficult to recognize.

In particular, when displaying a moving image, a problem arises in that lines perpendicular to the flowing direction become visually thinner and the display quality deteriorates. This problem is particularly noticeable when the display panel is composed of elements with slow reaction speeds, such as liquid crystals. Vertical lines disappear and become invisible.

Therefore, an object of the present invention is to provide a display panel shape 2, regardless of the viewing angle, position, or display state of the display panel.
The purpose is to always provide easy-to-read display and improve display quality.

[Means for Solving the Problem] A display panel in which a plurality of pixels are arranged in a matrix, an image data generation means in which a plurality of image data is stored, and a memory larger than at least the display capacity of the display panel. A display data storage means having a capacity, a control circuit that reads data of an image to be displayed from the image data generation means and writes it into the display data storage means, and a display data storage means based on the display data written to the display data storage means. a driver for driving the display panel, the control circuit transmits the data of the image to be displayed read out from the image data generating means so that at least one of the vertical lines and horizontal lines of the display image displayed on the display panel generates the image character. The image is converted so that it is displayed thicker than when it is displayed based on the image data stored in the means, and then written into the display data storage means.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 2 shows a circuit block diagram of a display device to which the present invention is applied. This display device includes a display panel 1, a central processing unit (hereinafter referred to as CPU) as a control circuit, 29 a glue-only memory (hereinafter referred to as CG) as an image data generation means.
It is written as ROM. ) 3. Random access memory (hereinafter referred to as display RAM) as display data storage means 4.
and a driver 5.

As shown in FIG. 1, the liquid crystal panel 1 has a horizontally elongated shape and consists of two transparent substrates 6 and 7 placed opposite each other. A plurality of transparent scanning electrodes CI, C2, C3, . . . are formed horizontally on the inner surface of the transparent substrate 6, and a plurality of transparent signal electrodes St, S are formed on the inner surface of the transparent substrate 7.
2. S3°... are formed in the vertical direction. Pixels 8 are formed at the intersections of each scanning electrode and signal electrode, and the pixels 8 are arranged in a matrix on the display panel 1.

FIG. 3 is a flowchart showing the operation of writing the image data stored in the CGROM 3 shown in FIG. 2 into the display RAM 4 by the CPU 2.

The image data stored in the CGROM 3 is written to the display RAM 4 according to this flowchart, and FIG.
As shown in FIG. 5, the data stored in the CGROM 3 is not written into the display RAM 4 in its original form, but after the image data in the CGROM 3 is converted by the CPU 2 so that the vertical lines become thicker. written.

After that, the driver 5 moves the scanning electrodes C1, C2°C3
, . . . , and an image signal based on the image data written in the display RAM 4 is applied to each signal electrode SL, S2 . S3. It is driven by a so-called dynamic drive system that outputs parallel outputs.

Figure 4 shows the configuration of CGROM3 (see Figure 2) and C
It shows an example of the storage state of image data in the GROM3. The storage area of CGROM3 includes multiple columns DIGO, DIOI, and D103.

..., and each image data is divided and stored column by column. In addition, the black part in the figure represents the logical value 1, and the white part represents the logical value 0, and the code D10
0, DIOI, D103, -. also indicate the address value of the corresponding column.

Figure 5 shows the configuration of display RAM (see Figure 2) 4 and C
Display RAM4 after writing image data of GROM3
3 shows an example of the storage state of image data in . The storage area of the display RAM 4, like the CGROM 3, has a plurality of columns M1, M2, M3, . ..., and each image data is divided and written column by column. In the figure, the black part represents the logical value 1, and the white part represents the logical value 0, and the symbol M1. M2. M3.・・・
* also indicates the address value of the corresponding column.

The image data stored in the display RAM 4 is written after the image data in the CGROM 3 is converted into image data of a desired display format by the CPU 2, as described above.
The image data read from the ROM 3 is converted into image data that is displayed on the display panel 1 with the width of the vertical line increased by one pixel, and then written.

Next, regarding the operation of this display device, display panel 1 shows "hour".
An example of displaying an image will be explained.

First, the operation of writing the image data "time" stored in the CGROM 3 into the display RAM 4 will be explained with reference to FIGS. 3 to 5.

First, in step 1, various variables such as column address designation of the CGROM 3 and column address designation of the RAM 4 are initialized. Next, in step 2, the address of the column of CGROM4 is Dloo, DI
At the same time, the column address of the display RAM 5 is designated as M9.

After that, in step 3, D 100 , D 101
Read the data. And in step 5 Dlo
o.

DIOI (7) Data logical sum D 10G V D 1
01, and in step 6, the logical sum value Do VDI obtained in step 5 is written in column M9 of the display RAM 4. Then, in step 5, the address specification of the column of CGROM 3 and the address specification of the column of display ROM 4 are each incremented by one address, and the specified address of each column is set to 0101 and D102, respectively.
shall be. Next, the process moves to step 7, but since writing of the image data "time" has not yet been completed at this point, the determination in step 7 is NO, and the process moves to step 2. In this way D115
．． The logical sum value of the data of and DllB D115 VDl
The routine goes through step 1 → step 2 → step 3 → step 4 → step 5 → step 6 → step 7 → step 2 until IB is written to M2O, and then goes to D15.
Logical value of data between and DIB D 15V D 1B power M
28 (that is, all writing of the image data "time 1" is completed), the process moves from step 7 to step 1, and each variable such as address designation 1 of column of CGROM 3, address designation of RAM 4, etc. is initialized. Ru.

As a result, CGRO
The data corresponding to the vertical line in the image data of M3 (shown in the fourth figure) is extended over two columns, and the vertical line part of the displayed character is converted into image data that becomes thicker and written. .

Therefore, when the display image "hour °" is displayed on the display panel l via the driver 5 based on the image data written in the display RAM 4, the vertical line of the display image "hour" is displayed as shown in FIG. is displayed thickly across two vertical pixel columns.

The above is the display operation of the present display device, taking the display image time as an example.

Note that when displaying a text consisting of a plurality of images (characters) such as a message text on the display panel 1, the CPU 2 first writes each image data constituting the text into the CGROM by an operation similar to the writing operation described above.
3, the image data is converted into image data in which the data corresponding to the vertical line is stretched over two columns, and the data is sequentially written into the display RAM 4.
When the driver 5 is driven, text consisting of images (characters) with thick vertical lines is displayed on the display panel 1 horizontally in the length direction of the display panel 1.

Therefore, when horizontal writing is displayed on the display panel 1, even if the display panel 1 is viewed diagonally from the horizontal direction, it is difficult to visually recognize the vertical lines in the displayed image that are far away, as in the case of conventional methods. It never becomes.

In addition, when performing a continuous display, after writing image data into the display RAM 4 by the above write operation, the addressing of the signal electrode of the display panel 4, which is the output light of the data of each column of the display RAM 4, is sequentially performed at a continuous speed. It is sufficient if the drive is performed so as to shift one address at a time in the flow direction in response to the following. At that time, the vertical line of the display image displayed on the display panel 1 is displayed thickly with two vertical pixel columns, and the display image moves in the direction of flow by one vertical pixel column, so that the display Of the two pixel columns displaying the vertical columns of the image, the portion displayed by the vertical pixel columns in the opposite direction appears to be displayed in a pseudo manner with twice the display time.

Therefore, the response speed of the display panel 1 can be increased in a pseudo manner, and even when a liquid crystal panel is used as the display panel 1 as in this embodiment, the display quality in the continuous display is not degraded and the visual performance is improved. It can be recognized and displayed clearly.

As another example, when displaying a vertically written display image on a vertically long display device, it is also possible to display thick horizontal lines in the display image.

In this case, the data in the column of CGROM 3 is logically summed with the data obtained by shifting the data in that column by one bit in the vertical direction, and the logical sum value is sequentially displayed on the RAM4.
If a display image based on the image data written to the display RAM 4 is displayed on the display panel 1 by the same operation as in the first embodiment described above, the display image will have two horizontal pixel columns with horizontal lines. It is displayed thicker over the entire area.

In this case, even when viewing the display panel l from below, the horizontal lines of the upper display image do not become difficult to see as in the conventional case.

In addition, if vertical character display is performed in this state, the vertical pixel row in the counter-flowing direction among the two horizontal pixel rows that display the horizontal row of the display image, as in the above-described embodiment. Since the displayed portion appears to be pseudo-displayed for twice the display time, it is possible to perform a continuous display that is easy to visually recognize.

Note that both the vertical line and the horizontal line may be displayed so that they are thick. In that case, when reading the image data from the CGROM, first read the data in two adjacent columns. After that, take the logical sum of these data, then shift the logical sum value by 1 bit in the vertical direction, take the logical sum of the data before shifting and the data after shifting, and display the logical sum value. All you have to do is write it to .

Note that the thickness of the vertical lines and horizontal lines in the display image can be selected as appropriate. For example, the data of three adjacent columns in the CGROM 3 can be taken out, the logical sum value of these three data can be written to the display RAM 4, and the display can be performed. If this is done, the vertical line of the display image displayed on the display panel l will be displayed with a thickness spanning three vertical pixel columns.

Note that the driving method by the driver 5 is not limited to the above-mentioned dynamic drive method, but may also be a static drive method.

[Effects of the Invention] As described above in detail, according to the present invention, at least one of the vertical lines and horizontal lines of the display image displayed on the display panel of the image data read from the image character generating means is thickened. In order to convert the image data to be displayed and write it into the display data storage means, the display is always easy to view and the display quality is maintained regardless of the shape of the display panel, the viewing angle or position of the display panel, or the display state. can be improved.

[Brief explanation of the drawing]

The drawings relate to one embodiment of the present invention, in which FIG. 1 is a front view of the display panel, FIG. 2 is a block diagram of the structure, and FIG.
4 is an explanatory diagram for explaining the configuration of the image data generating means, and FIG. 5 is an explanatory diagram for explaining the configuration of the display data storage means. DESCRIPTION OF SYMBOLS 1... Display panel, 2... Control circuit (central processing unit), 3... Image data generation means (CGROM), 4... Display data storage means (display RAM), 5. Driver. Applicant Seikosha Co., Ltd.

Claims (1)

[Scope of Claims] A display panel in which a plurality of pixels are arranged in a matrix, an image data generation means in which a plurality of image data is stored, and a storage capacity that is at least larger than the display capacity of the display panel. reading the data of the image to be displayed from the display data storage means and the image data generation means;
The control circuit includes a control circuit for writing data into the display data storage means, and a driver for driving a display panel based on the display data written in the display data storage means. The image data to be displayed is such that at least one of vertical lines and horizontal lines of the display image displayed on the display panel is thicker than when displayed based on the image data stored in the image character generation means. A display device, characterized in that the converted data is converted to be displayed and written into the display data storage means.