JPS62178996A - Liquid display unit - 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] Industrial Application Fields The present invention relates to a liquid crystal display device, and in particular, to a dot matrix color liquid crystal display device in which a display information generating section is improved in order to improve display quality. The present invention relates to a liquid crystal display device characterized by:

<Conventional technology> The conventional technology will be explained below with reference to the drawings.

FIG. 6 is a pixel arrangement diagram of a dot matrix color liquid crystal display (hereinafter referred to as "display").

In this FIG. 6, the display 1 is red (R).

What is a single dot pixel consisting of the three primary colors of green (G) and blue (B) (in this case, 8 colors can be displayed by combining them)? ff number matrix (at this time, the drums arranged in each column are
dI + d2 +...dTL, low address NO
ral, ra2. - Arranged in raTL). In this case, the dot shape is “
It is a combination of L I+ or ゛['' shape.

By the way, regarding the arrangement of each RGB pixel and the dots of this display 1, this is not the only one and there are various other patterns, but the dot shape is close to a dot, and the display resolution is high. Since the pattern shown in FIG. 6 is considered to be the optimal arrangement for heightening, the following description will be entirely based on this arrangement.

FIG. 7 is a block diagram of a conventional liquid crystal display device.

In FIG. 7, A is a display section consisting of a display 1 and a driver section 2 for displaying predetermined characters, symbols, figures, etc. on the display 1. The driver section 2 generates first display information in which an RGB arrangement is selected at an appropriate period from a display information generating section, which will be described later.

a shift register 21 that inputs serial information SRd of second display information and third display information and converts the serial information SR+1 of the second display information, second display information, and third display information into parallel information; A column driver 22 drives each column of the display 1 based on display information from the shift register 21, and a column driver 22 drives each column of the display 1 based on display information from the shift register 21. It consists of a driver 23. F includes a storage element 3, a pixel selection circuit 4, and an arithmetic control circuit 51. This is a display information generating section consisting of a control section 5 consisting of a row address selection circuit 52 and a shift register 6. Here, the storage element 3 stores RGB pixel information (O7/OFF information) corresponding to one dot on the display 1, and is sequentially scanned under the control of the arithmetic control unit 51 and is scanned sequentially by the data bus 7. For example, dot d+ 17) R+
, B+, C+ and R2, B2 . of dot d2. C2
) is sent to the pixel selection circuit 4. Pixel selection circuit 4
is the input R+, B+CI and R2,82,C
2 is unified (serialized) and then, based on the load address information Ad<10th address cycle ra,), for example, R mark 182 is first scanned and the second display information T+ (R+>, 1st Display information J2 (Gl
), the parallel information of the third display information 13 (B2) is output to the shift register 6, and when this first selection is completed, the same pixel information R+, 8+, C+ and R2+ 8 is output again.
Enter 2 + 02 to enter the load address information Ad (second
B+, R2, based on the 0-door address period ra2)
G2 is scanned and similarly output as the first to third display information. In the shift register 6, the first display information 11
The parallel information of +second display information 12+third display information I3 is again converted into serial information and output to the shift register 21 of the display section A. The shift register 21 of the display section A converts the input serial information into parallel information and outputs it to the column driver 22. Since the row address information Ad is input to the row driver 23 at the same time as this pixel information, the column driver 22 and the row driver 23 display a predetermined character +P2, etc. on the display 1.

<Problems to be Solved by the Invention> However, in this conventional liquid crystal display device, when line segments are displayed on the display, a jagged pattern called JAG occurs due to the arrangement of pixels. There is. FIG. 8 is a diagram for explaining problems in the conventional technology, and basically shows on (lighting) and off (lighting out) of pixels when line segments are displayed as a display pattern. In this figure, lighting is indicated by diagonal lines. The problem will be explained in more detail below using FIG.

FIG. 8(A) shows a case where vertical line segments are displayed. In this way, vertically, pixels are turned on alternately on one side, so when viewed from a distance, one side of the straight line appears jagged.

FIGS. 8(B) to (E) are cases in which diagonal lines are displayed. When displaying diagonal lines, it is necessary to separate them into horizontal lines and vertical lines (including points) depending on the slope of the diagonal line. Figure (B
), (D), and (E), the dot joints are somehow continuous, but in the case of (C), a gap appears. For this reason, diagonal line display originally causes JAG, but (
In the case of C), gaps even exist, which causes deterioration in display quality. Even when an arbitrary pattern is displayed, the above-mentioned results appear in total, resulting in a loss of overall display quality. figure(
F) is an example when the number II 6 IT is displayed,
It can be seen that the above-mentioned development appears in the α and β portions.

In order to improve this JAG, it is possible to correct the display of perpendicular lines and diagonal lines using only software processing. In order to perform software processing, since the shape of a pixel differs depending on the coordinates, it is necessary to perform processing corresponding to each shape of the pixel that requires correction, and in addition, the color of the pixel to be turned on for correction must be changed. It is necessary to consider points such as the need to correct this because it appears differently depending on the coordinates. Therefore, in order to perform correction using only software processing, first understand the physical shape from the position of the target 1ζ dot, decide whether to apply correction to the left or right dot, and then determine which color pixel to apply correction to. etc. to decide what to turn on? ! Perform rough processing.

Therefore, the burden on the software becomes very large, and it is not a practical solution to the problem.

The present invention has been made in view of the problems of the conventional technology, and in order to improve the display quality of a display device in which RGB pixels are arranged in a matrix, the present invention has a display information generating section that turns on and off display pixels. An object of the present invention is to provide a liquid crystal display device incorporating a correction element for correcting /-J.

<Means for solving the problems> The liquid crystal display device of the present invention for achieving the above-mentioned object has the following features:
When the pixel information output from the storage element described above indicates a line segment in which all three primary colors are ON information, the correction flag information is output from the correction element to the pixel selection circuit, and from this pixel selection circuit. The arrangement of the three primary color information and the correction flag information is selected at appropriate intervals and outputted as the first display information, the second display information, the third display information and the correction flag information. The information and the correction flag information are led to an OR gate circuit, and the output information of the OR gate circuit and the first display information and the third display information are led to a display device, thereby changing the jagged shape that the dot originally has. The present invention is characterized in that the display shape is corrected to form a display shape with excellent visibility on the display device.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings. In the following drawings, parts that overlap with those in FIGS. 6 to 8 are given the same numbers, and their explanations will be omitted.

FIG. 1 is a block diagram of a liquid crystal display device that is a specific embodiment of the present invention, and FIGS. 2 to 4 are diagrams for explaining the present invention.

In FIGS. 1 to 4, 30 is a storage element. This storage element 30 is, for example, R, G, which corresponds to one dot on the display 1, as shown in FIG. 2 (A>).

Each of B R+ l R21..., G, *G 21
..., BI+821... is stored, while the output information (SR,
So, Ss) It;: When all of one dot is ON information, that is, when the dot indicates a line segment, correction flag information < SF) is output to the pixel selection circuit 40. For example, it consists of a correction flag F. A correction element 8 is stored at the same time. now.

For example, when performing interpolation on a predetermined RGB position, if that position is a white line segment (i.e., all are on),
The correction flag F at the corresponding position is turned on. Regarding the correction flag F in this case, the part that is not originally necessary (
(When two adjacent dots are both lit), it is written so as not to have any effect on the dot, and also to judge which color dot should be lit on the left or right side of the dot, which is caused by the difference in the coordinates of the dots. It is assumed that the program is programmed so that there is no need to do this. In other words, as a software process, it is sufficient to set all flags for white line segments. In this case, almost no software burden is required for correction. 40 is memory element 3
This is a pixel selection circuit to which information obtained by reading out two dots of information at a time from 0 is input. The operation of this pixel selection circuit 40 is the same as that of the pixel selection circuit 4 described in the related art,
The difference is that correction flag information is additionally input and the selection operation is performed. That is, the first display information [++second display information 12, third display information 13 . The first time, the correction flag information Ip is f+=
R+, 12=G+.

13 = B2, IF = F2. The second time, I+ = 8+, [2 = R2.

13 =G2, IF =F+, are output. 9 is first display information ■2 and correction flag information I
This is an OR gate circuit that inputs F and outputs this information as D2 when at least one of the pieces of information is present (when it is on). In FIG. 1, the signal when inputting the third display information 13 to the static register 6 is designated as Dl, and the signal when inputting the third display information 13 to the shift register 6 is designated as Dco.

Now, as shown in FIG. 2(B), dots d, R+, G+, and B+ are lit on the display 1, and dot d2 is lit.
The case where R2 is turned on will be explained.

In the pixel selection circuit 40, a dot d7 where R+, G+, B+, and F+ are all H,
When RGBF information for 2 dots of dot d2 in which R2, G2.82, and F2 are all L is input, the pixel selection circuit 40 outputs 1+=R for the 10th address rat.
+ ”H, 12=G kan = H, I ko
=82 =L, I F =F2 =1
is selected and output. As a result, the inputs of the shift register 6 are: D+ = Rma = l-1, D2 = G + = I
I.

Os =82 =L. Next, regarding the 20th address ra2, I+
=B! "H, 12=R2=L, 13
=G2-L, Ip =F+ =H are selected and output. As a result, the inputs of the shift register 6 are D+ -8+ = H, D2 = R2 = H.

D3=02-1. These results are led to the display device, and in the display device 1, the non-lighting information R2 is stored in the storage element 30.
The part will light up.

As shown in Figure 3, by configuring as in the present invention,
The drawbacks of the prior art shown in FIG. 8 can be solved.

In FIG. 3(A) corresponding to FIG. 8(A>), the pixel of the non-protrusion molecule +=Ta lights up, and the straight line portion becomes a neat shape.

In FIG. 3(C), which corresponds to FIG. 8(C), the pixels of gap portion molecules 5 to γG are lit, resulting in a shape with no gap in the connecting portion.

In Fig. 3 (F) corresponding to Fig. 8 (F), “6
'' numbers α2 to α6. β3. are lit up, making the shape more clear.

By the way, it is conceivable that such correction may disrupt the RGB color balance and cause color unevenness. However, since some parts contain RGB regularly, this is not an equivalent problem, and since RGB appears alternately in the pixels that turn on due to correction, the overall number of RGB is the same, so in reality color unevenness does not occur. In addition, in the case of FIG. 3(C), only two pixels of RGB are turned on in correction part molecules 5 to γ6, so only one dot is colored.
Considering the visual effect, the effect of reducing JAG due to correction is much greater than that of causing color unevenness. Also, when the slope of the diagonal line becomes 45 degrees, the number of discontinuous points becomes maximum and the number of pixels lit for correction becomes maximum, but in this case, RGB dots appear alternately as dots lit for correction. On average, visually, the colors are mixed to give a white color, with almost no color unevenness.

FIG. 4 is a 70-sheet showing one algorithm for such a series of display processing.

Other Embodiments The present invention is not limited to the configuration shown in FIG. For example, the structure may be configured as shown in FIG. 5, which is a block diagram of a liquid crystal display device showing another embodiment of the present invention. The structural difference between FIG. 1 and FIG. 5 lies in the correction elements. That is, in the case of Fig. 1, a correction flag 8, which is a correction element, is provided, but it may be omitted so that correction is always performed for white dots. This is not a particular problem for those that only display. That is, the pixel information NSR, So
, SB indicates a line segment in which all three primary colors constituting one dot pixel are ON information, the correction flag information may be output to the pixel selection circuit 40.

A specific example is to input all the pixel information SR, So, 8th to the correction element, for example, the AND gate circuit 30b, that is, when all the information is (I''), the output SFO from the AND gate circuit 30b is The configuration may be such that it is guided to the pixel selection circuit 40. In this way, Figure 4 (A) - (
In addition to D), in FIG. 4(E) corresponding to FIG. 8(E), the molecule 7 to γ light up, and in FIG. 4(F) corresponding to FIG. 8(F), ' The number 6″ is α, ~ β6.
It can be seen that β1 to β4 and δ are lit, and 6'' is more clearly formed.

In the above description, the correction is applied to all white dots, but it goes without saying that the same correction can be applied to black dots by taking a negative argument, for example.

In addition, the shift register 6.21 is a parallel-serial/serial-parallel conversion circuit for transmitting display information from the display information generating section B to the display section Δ, so it is essentially unnecessary, and may be changed depending on the design. Of course, it is also possible to design by excluding the above.

・〈Effects of the Invention〉 As the present invention has been specifically explained above along with the examples,
A display device having a display unit having a plurality of one-dot pixels of three primary colors arranged in a dot arrangement, a storage element that stores pixel information of the plurality of dots, and a display device that inputs the pixel information read out from the storage element. In a liquid crystal display device consisting of a pixel selection circuit that outputs first to third display information, and a control device that controls each of these pixels, when the three primary colors indicate line segments in the pixel information output from the storage element. The correction flag information is output from the correction element to the pixel selection circuit, and the second display information and the correction flag information of the output from the pixel selection circuit are ORed.
According to the liquid crystal display device of the present invention, which is obtained through a gate circuit, the JA that occurs due to the connection relationship when representing a certain shape due to the relationship of the pixel arrangement due to the simple structure.
This has the effect that the jagged pattern shape inherent in the dots called G can be easily corrected, and a shape with excellent visibility can be obtained at a low cost.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a liquid crystal display device that is a specific embodiment of the present invention, FIGS. 2 to 4 are diagrams for explaining the present invention, and FIG. 5 is a block diagram of a liquid crystal display device that is a specific embodiment of the present invention. 6 is a pixel arrangement diagram of a dot matrix color liquid crystal display device, FIG. 7 is a block diagram of a conventional liquid crystal display device, and FIG. 8 is a diagram showing the problems of the conventional technology. It is a figure provided for explanation. A...Display section, 1...Display device, 2...Driver circuit, F...Display information generation section, 3, 30.300...
・Storage element, 4.40... Pixel selection circuit, 5... Control unit, 6... Shift register, 8, 10... Correction element, 9... OR gate circuit Figure 1 Figure 2 (A) (B) Figure 5

Claims (1)

[Claims] First display information and second display information in which the driver section that drives the display section has a display section in which a plurality of one-dot pixels of three primary colors are arranged, and the arrangement of the three primary colors is selected at an appropriate period. , a display device that inputs as third display information and displays predetermined characters, symbols, figures, etc., a storage element that stores the state of each of the pixels, and inputs the pixel information read from the storage element. A liquid crystal display device comprising: a pixel selection circuit that outputs the first display information, second display information, and third display information; and a control device that controls the display device, the storage element, and the pixel selection circuit, respectively. a correction element that outputs correction flag information to the pixel selection circuit when the three primary colors indicate a line segment in the pixel information output from the storage element; and information from the correction element and information from the storage element. a pixel selection circuit that inputs the first display information, second display information, third display information, and the correction flag information; and among the outputs from the pixel selection circuit, the second display information and the 1. A liquid crystal display device comprising: an OR gate circuit inputting correction flag information and outputting the information when at least one of the pieces of information is present.