JPS5818683A - Method and circuit device for improving reproduction state of alpha numeric character and graphic symbol in raster image - Google Patents

Abstract

1. A method of improving the reproduction of alphanumeric characters and drawings on electron-beam raster display screens wherein the dots or lines forming these characters or graphic symbols are produced by an appropriate pulse-controlled brightness control, characterised in that either the bright-dark edges or the dark-bright edges of the control pulse for the bright-ness control of the raster display screen are delayed in time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the generic part kl! of claim ll5jI11. The present invention relates to a method and a one-way apparatus for improving alphanumeric character and graphic symbol 0 reproduction layers in a rask image #C, such as softening.

111! A light emitting point or value line is generated by controlling the brightness in the scanning line of the raw device. This pigeonhouse usually produces a light zero or a light spot depending on the degree of deflection.

The length of the displayed light is the product of the degree of polarization of the light and time as shown in the following equation: jL - Ma#tr
X tXw*pζζit - length of the grid line, vstr
are the light deflection mode, s'', and the control pulse duration for brightness control, respectively.

- The same can be said for the lifting platform that is exposed to the dark area by controlling the scotoma to the bright area.

According to the well-known OJ, the alphanumeric character code or graphic symbol O image can appear indistinctly #CC, especially when Km is darkened against a bright background. This is due to the fact that the final expansion of the light spot is not taken into account since the brightness (WAi point control pulse is 0).

Light O deflection speed '#tr and pulse duration tXwsl
and O product [H! IIO length lx, E light point 01111
# and this becomes the final optical OaO length. The light O is important in the case of the shortest point ``O'', but the light 11J (appears longer).

In particular, when a dark code is displayed on a bright background, the reproduction quality deteriorates. In this case, it will be shorter than the required write *
$1 t II is what makes this kind of relationship 1lijI.

The present invention provides raster images O characters and graphic symbols O1
In particular, it is an object of the present invention to improve the image impression of a pigeonhole, which reproduces a dark code on a bright background, without increasing costs.

ζ011 is solved by the real 110 method having the features disclosed by patent claim 01111m111.

IL-Route device for implementing ζO direction Patent claim 011
111j114.

The advantages of this method or the one-way device according to the present invention are evident from the claims 1IJII, paragraph 2, and aS, or paragraphs 5 to 1* of the present invention.

41E, it is pointed out that by changing the light-clear part or the clear-light part of the control pulse, the length of the dark line for brightness or the bright line for darkness can be shaped. The other pulse edge is delayed by polarizing the diode used in the zero-wire device E4N. The delay time is adjusted by a resistor provided as an adjustment resistor to meet various requirements.

Not only does the real 1 ink method clearly improve the image impression when reproducing dark characters on a bright background, but also the ORT control function and Data monitor by unknown O control signal liquid NIL, especially O sentences per line! The desired purpose can also be achieved in a field where the number of brightness control stages is large and the cutoff frequency is relatively low, or where the light spot is relatively stable.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings showing embodiments of the present invention.

The pulse shape of the brightness (priority) control pulse described above is shown in jllll. Below that is the writing light trail or 1
The point portions 1゜1' shown adjacent to the row '' are shown at predetermined intervals.2 O@row''1-'O ME is the point portion area 2
and the lower part E of the pulse to which point partial region 4 belongs, respectively.
lf, Th is falling.

The two regions 2 and 4 each indicate a bright point or a@* line.Therefore, in the two regions 2 and 40f4, there is a region 5, a dark "point".

M(@value-'') is 1 point and 2 long, so the error is unconditionally the same large red, but the relative error is slightly smaller, and [k is also observed as a small intensity. .

If the wave length of the control signal is higher than the shoulder wave number of the monitor, the control signal will be deformed into a platform or triangular shape, with short bright spots and dark spots, as shown in Figure 112. looks long. The modification of the control pulse makes the bright point appear shorter than the dark point, or the brightness oq darker than the clear brightness oq.
bring points.

2nd all again shows the original pulse train (brightness control pulses) and FIG. 2b is the pulse train at the output of the brightness control stage with the modified control pulses. In the second all, two lines 081111 and 1 right and 1' are shown.

In the intervening light trail, there is a long dark point ``5'' or a long dark point ``6'' that corresponds to the modified pulse shown in #211@i.
is depicted. To generate a strong brightness for the optical impression, the light pulses act on the 0-IIO only, ie, from the limit, only a part of the S echoing at the tip of the triangular shadow is perceived.

5th ssc illustrating the line generation failure of the method according to the invention
At the top, the original pulse train is illustrated (
(Figure Sa). The image reproduction will also be improved in the same case as shown in FIG. 1, ie with shorter pulse durations for bright lines and longer pulse durations for dark lines. These pulses are modified such that their rising edges are shifted by .DELTA.t according to one pulse, as shown in FIG. 3b. The pulse edges changing from dark to feather are delayed in time, but the edges changing from light to dark are not affected in any way.

jI5ell between two adjacent 1 columns "1 and 1'"
O party traces, bright 1 corresponding to the pulse to which they belong
Point #8 lazy and bright l111G are illustrated and one bright point "same length as 8 O clear one point" 9 is both 1ll (point) 8
The imperial edict and 1oOg144c are shown.

am, no disturbance of light appears in the diagram.

Rather, the increased bright spot becomes smaller, but it is not recognized in the internal discussion, and the optical impression becomes the standard in order to keep the edge Ojl extension constant. In this case, depending on the polarization mode and the control pulse duration, the light must be so large that the bright and dark spots appear of equal length.

As is clear from the 2-0 parent meeting, when the monitor O's shoulder wave number disappears, the impression of ζO field 11 is dark--edge lIO
The other side remains unchanged, but the negative edge is changed so that it is prolonged.

If the pulse does not reach the apex O value, it will decrease as shown and will be more clear than the individual O light points.

Due to the clear edge 0111Ut, the pulse appears at the peak 0 value and exhibits a ★ shadow. As a result, the light spot becomes brighter and wider.

jI4- Minoru Hiromoto@k An open-circuit meg 01 for discussing such a method is also O to show an example of the theory.

A diode D- and a resistor R are connected in parallel to jlJa. The part where the output side of the ζO parallel circuit and the capacitor 0 are integrally connected by K11t is connected to the input E1m of the Schmitt trigger Bte. Schmitt trigger-8TO negative output is connected to the inverter IO human power.

11141L m1sc vs. ET! 114 blld,
Pulse trains a and β appearing at each point shown in the 4th IC
, r, a The O pulse diagram is also O.

The other edge can be delayed by polarity reversal of diode D□. The resistor R acts as an adjustment resistance, and allows the grinding time to be adjusted to meet various requirements. For example, Schmitt trigger 8 Te is integrated! When configured with Qi technology, it is given by a simple configuration.

[Brief explanation of drawings]

This is a diagram illustrating Takeshi Sogata according to a well-known method. Figures II2, a, b, and a are diagrams illustrating the shape of the data monitor by a well-known method when the number of shoulders and shoulders is reduced. No. N @ *, b, @ Saneaki Hiromoto k 0 @ Liaowei is also illustrated in order to explain such a method. 4th @*, l is oB for implementing the method according to the present invention
A diagram illustrating the pulse diagram of the bribe device and the corresponding points is also shown in FIG. The correspondence of the main reference symbols in the figure is as follows. D...Diode R...Resistor O...Capacitor E...Inverter 8 Te...Schmitt trigger 1,1'...Row 2.5.8...Bright spot Is, 4. 9...scotoma 4.7.10...1j1(*)m

Claims (1)

[Claims] (1) To improve the reproduction of alphanumeric characters and graphic symbols in raster images, such as characters or graphic symbols O, which give points or lines by brightness control with corresponding pulse control. The above method is characterized in that the light-to-dark part or the dark-to-clear part of the control pulse for controlling the lasso intensity varies temporally. (2) The method described in Section 1 of Iris III by Zenkyo Sokyu, wherein the delay time is variable. (3) In the method described in Patent Terminal No. 01111, Paragraph 2, either the 1 light-dark II & part or the dark-light part 0 is changed by switching k. (4) In a circuit arrangement for implementing the method for improving the reproduction conditions of alpha-numeric characters and graphic symbols according to Raster So, a diode (D) i (with a resistor (R) connected in parallel and w
The common connection point with the capacitor (0) connected to the output side of the I parallel circuit is the Schmitt trigger (8T) input Ic.
Lol! Being wired, Isa Schmidt trigger (8 te)
The negative output of is connected to the inverter α)O input,
The inverter is configured to generate an inverted output pulse at the same timing as the input pulse of the scissors inverter O. -Roadside location. Device) The circuit device according to claim 01EIIj14, wherein the resistor (R) is an adjustment resistor. (6) Patent claim 011111F Section 4 or Section 5 O
The O-path device Fc described in any one of the above circuit devices, wherein the Schmitt trigger (8) is configured by a concentration device 11. (7) The one-way device according to any one of claims 4 to 6, wherein the diode (D) is configured to have an opposite polarity.