CN102968949B - Stroke type symbol generator and improve the method for its display effect - Google Patents
Stroke type symbol generator and improve the method for its display effect Download PDFInfo
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- CN102968949B CN102968949B CN201210406599.XA CN201210406599A CN102968949B CN 102968949 B CN102968949 B CN 102968949B CN 201210406599 A CN201210406599 A CN 201210406599A CN 102968949 B CN102968949 B CN 102968949B
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Abstract
The present invention relates to stroke type symbol generator and improve the method for its display effect, stroke type symbol generator comprises vector generator, the output terminal of this vector generator connects D/A converter and sampling holder respectively, and D/A converter is connected by operational amplifier with sampling holder, D/A converter be provided with for vector generator export X, y deflection coordinate input port, sampling holder be provided with for vector generator sampling holding signal input port; The present invention adopts D/A converter, operational amplifier and sampling holder hardware circuit to realize X and y deflection analog signal output, the relation that in vector generator, character exports between character writing speed is utilized to control holding signal of sampling, realize the smooth output of defection signal, solve intrinsic " burr " interference produced in DA chip transfer process, improve the smooth effect of symbol generator output symbol, thus improve symbol display quality.
Description
Technical field
The invention belongs to the symbol generation technique field in airborne display devices, relate to a kind of stroke type symbol generator and improve the method for its display effect.
Background technology
Head-up display or Helmet Mounted Display project in the visual field, dead ahead of driver exactly needing the symbol of display, make various information together with real outdoor scene information superposition, and these displaying symbols are generated by symbol generator.
Symbol generator is the source that whole character exports, and the quality of its output signal directly determines display effect of terminal.Various figures (line, circle, character) on head-up display status screen can be regarded as and combined out by some straight-line segments, character conversion precision is higher, resolution is higher, the point exported is more, the line segment formed is finer and smoother, so the quality of DA change-over circuit directly determines image display quality.There is 1/2 range, 1/4 range, 1/8 range etc. in current DA chip inherently characteristic, during conversion, because counter rollover is asynchronous, defection signal is made to occur skew, D/A exports interference voltage can reach hundreds of millivolt, even a few volt, causes display stroke to occur dim spot or bright spot or distortion at this place thus, we claim this to be " zero passage phenomenon ", belong to " burr " interference problem.Current vector character generator hardware structure one directly adopts voltage-type D/A converter to output signal, and burr interference is obvious.Another kind is that current mode D/A converter coordinates amplifier and sampling holder output drive signal, and principle is independent detection, filters the burr of indivedual range transfer point, and this scheme expression effect in different hardware module is different, does not eliminate completely.
Summary of the invention
The object of this invention is to provide a kind of stroke type symbol generator and improve the method for its display effect, " burr " interference occurred during to eliminate symbol generator display.
For achieving the above object, stroke type symbol generator of the present invention comprises vector generator, the output terminal of described vector generator connects D/A converter and sampling holder respectively, and D/A converter is connected by operational amplifier with sampling holder, described D/A converter be provided with for vector generator export X, y deflection coordinate input port, described sampling holder be provided with for vector generator sampling holding signal input port.
Further, described D/A converter is DAC-HF12BMM, and operational amplifier is AM500, and sampling holder is AD585SE.
The method step improving stroke type symbol generator display effect of the present invention is as follows:
(1) character in the vector generator of stroke type symbol generator produces logic module and produces parallel two-way 12 X, y deflection coordinate digital amount, and with certain speed input D/A converter;
(2) D/A converter converts digital quantity to analog current signal;
(3) analog current signal converts voltage-type defection signal amplification transmission to through operational amplifier;
(4) sampling that the sampling in vector generator keeps logic module to produce sampling holding signal control sampling holder keeps sequential, require sampling keep sequential export with character between relation be: character output clock and character writing speed consistent, the DA switching signal normal point that character exports is in sample region, just holding area is in when there is little saltus step, thus eliminate burr interference, make the X of voltage-type defection signal output smoothing after sampling hold circuit, y deflection signal.
Further, described sampling holding signal is coefficient multiplier clock and its derivative pulse in vector generator, and sampling holding signal has identical frequency with coefficient multiplier clock.
Further, sampling keeps pulse duty factor consistent with character writing clock duty cycle, ensures that sampling holder has enough sampling times, makes the output signal when little saltus step appears in DA switching signal just be in holding area.
Stroke type symbol generator of the present invention and improve the method for its display effect, D/A converter, operational amplifier and sampling holder hardware circuit is adopted to realize X and y deflection analog signal output, utilize the relation that in vector generator, character exports between character writing speed to control holding signal of sampling, realize the smooth output of defection signal.Solve intrinsic " burr " interference produced in DA chip transfer process, improve the smooth effect of symbol generator output symbol, thus improve symbol display quality.
Accompanying drawing explanation
Fig. 1 is the structural representation of stroke type symbol generator of the present invention;
Fig. 2 is that sampling keeps time diagram;
Fig. 3 is that sampling keeps uncomfortable design sketch;
Fig. 4 is that suitable sampling keeps design sketch.
Embodiment
One, stroke type symbol generator
As shown in Figure 1, stroke type symbol generator comprises vector generator 1, the output terminal of this vector generator 1 connects D/A converter 4 and sampling holder 6 respectively, and the signal of D/A converter 4 exports the signal input part being connected into operational amplifier 5, the signal of operational amplifier 5 exports the signal input part being connected into sampling holder 6, D/A converter be provided with for vector generator export X, y deflection coordinate input port, sampling holder be provided with for vector generator sampling holding signal input port.D/A converter is DAC-HF12BMM, and operational amplifier is AM500, and sampling holder is AD585SE.
Analog current signal is converted to through D/A converter 4 after the digital quantity (X and Y coordinates information) that character generation logic module 2 in the vector generator 1 of stroke type symbol generator walks abreast the two-way 12 produced squeezes into D/A converter 4 with given pace, the current signal of simulation converts voltage mode signals to through operational amplifier 5 and amplifies transmission, voltage-type defection signal exports X and y deflection signal after sampling hold circuit 6, and the sampling that the sampling in vector generator 1 keeps logic module 3 to produce sampling holding signal control sampling holder keeps sequential.
Two, the method for stroke type symbol generator display effect is improved
The method step improving stroke type symbol generator display effect is as follows:
(1) character in the vector generator of stroke type symbol generator produces logic module and produces parallel two-way 12 X, y deflection coordinate digital amount, and with certain speed input D/A converter;
(2) D/A converter converts digital quantity to analog current signal;
(3) analog current signal converts voltage-type defection signal amplification transmission to through operational amplifier;
(4) sampling that the sampling in vector generator keeps logic module to produce sampling holding signal control sampling holder keeps sequential, require sampling keep sequential export with character between relation be: character output clock and character writing speed consistent, the DA switching signal normal point that character exports is in sample region, just holding area is in when there is little saltus step, thus eliminate burr interference, make the X of voltage-type defection signal output smoothing after sampling hold circuit, y deflection signal.
Stroke type symbol generator sampling keeps sequential chart to see Fig. 2, be described for the stroke type symbol generator shown in Fig. 1, in Fig. 2,21 represent binary coefficient multiplier clock in vector generator, voltage waveform when occurring that burr disturbs in 22 expression each vector point voltage waveform that DA exports under counter clock frequency, 23 represent reverse binary coefficient multiplier clock, 24 represent sampling holding signal, and 25 represent the vector point voltage waveform after sampling maintenance.
Sampling holding signal must be coefficient multiplier clock and its derivative pulse in vector generator, and sampling holding signal has identical frequency with coefficient multiplier clock.The selection of pulse duty factor will ensure that sampling holder has enough sampling times, select suitable sampling holding signal, make the output signal when little saltus step appears in DA switching signal just be in holding area, thus eliminate burr interference, export the signal of uniformly continous.
As Fig. 3,4, to the comparative analysis of head-up display display frame sectional drawing, circled is display difference place.Sampling keeps uncomfortable design sketch to see Fig. 3, and Character deformation place a and b character position are just DA transformed error maximums on X-coordinate axle, cause Charactes Display distortion in various degree, incompleteness.Suitable sampling keeps design sketch to see Fig. 4, and the display character aa after improvement and bb character are obviously round and smooth, even.
It should be noted last that: above embodiment is the non-limiting technical scheme of the present invention in order to explanation only, different instances parameter value is different, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that; Still can modify to the present invention or equivalent replacement, and not depart from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1. a stroke type symbol generator, comprise vector generator, it is characterized in that, the output terminal of described vector generator connects D/A converter and sampling holder respectively, and D/A converter is connected by operational amplifier with sampling holder, described D/A converter be provided with for vector generator export X, y deflection coordinate input port, described sampling holder be provided with for vector generator sampling holding signal input port; The sampling that sampling in vector generator keeps logic module to produce sampling holding signal control sampling holder keeps sequential, require sampling keep sequential export with character between relation be: character output clock and character writing speed consistent, the DA switching signal normal point that character exports is in sample region, just holding area is in when there is little saltus step, thus eliminate burr interference, make the X of voltage-type defection signal output smoothing after sampling hold circuit, y deflection signal.
2. stroke type symbol generator according to claim 1, is characterized in that: described D/A converter is DAC-HF12BMM, and operational amplifier is AM500, and sampling holder is AD585SE.
3. improve a method for stroke type symbol generator display effect, it is characterized in that, the step of the method is as follows:
(1) character in the vector generator of stroke type symbol generator produces logic module and produces parallel two-way 12 X, y deflection coordinate digital amount, and with certain speed input D/A converter;
(2) D/A converter converts digital quantity to analog current signal;
(3) analog current signal converts voltage-type defection signal amplification transmission to through operational amplifier;
(4) sampling that the sampling in vector generator keeps logic module to produce sampling holding signal control sampling holder keeps sequential, require sampling keep sequential export with character between relation be: character output clock and character writing speed consistent, the DA switching signal normal point that character exports is in sample region, just holding area is in when there is little saltus step, thus eliminate burr interference, make the X of voltage-type defection signal output smoothing after sampling hold circuit, y deflection signal.
4. the method improving stroke type symbol generator display effect according to claim 3, it is characterized in that: described sampling holding signal is coefficient multiplier clock and its derivative pulse in vector generator, sampling holding signal has identical frequency with coefficient multiplier clock.
5. the method improving stroke type symbol generator display effect according to claim 4, it is characterized in that: sampling keeps pulse duty factor consistent with character writing clock duty cycle, ensure that sampling holder has enough sampling times, make the output signal when little saltus step appears in DA switching signal just be in holding area.
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| CN201210406599.XA CN102968949B (en) | 2012-10-23 | 2012-10-23 | Stroke type symbol generator and improve the method for its display effect |
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| CN201210406599.XA CN102968949B (en) | 2012-10-23 | 2012-10-23 | Stroke type symbol generator and improve the method for its display effect |
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| CN102968949B true CN102968949B (en) | 2015-08-05 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104299546B (en) * | 2013-11-28 | 2018-01-02 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of head-up display and realize its homologous method |
| CN104299551B (en) * | 2013-11-28 | 2016-09-14 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of head up displays and improve the method that its stroke character writes efficiency |
| CN104299542B (en) * | 2013-11-28 | 2017-02-01 | 中国航空工业集团公司洛阳电光设备研究所 | Head-up display and display delay control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4635050A (en) * | 1984-04-10 | 1987-01-06 | Sperry Corporation | Dynamic stroke priority generator for hybrid display |
| US5969699A (en) * | 1996-10-08 | 1999-10-19 | Kaiser Aerospace & Electronics Company | Stroke-to-stroke |
| CN102509315A (en) * | 2011-09-23 | 2012-06-20 | 中国航空工业集团公司洛阳电光设备研究所 | Stroke type symbol generator and writing method thereof |
-
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- 2012-10-23 CN CN201210406599.XA patent/CN102968949B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4635050A (en) * | 1984-04-10 | 1987-01-06 | Sperry Corporation | Dynamic stroke priority generator for hybrid display |
| US5969699A (en) * | 1996-10-08 | 1999-10-19 | Kaiser Aerospace & Electronics Company | Stroke-to-stroke |
| CN102509315A (en) * | 2011-09-23 | 2012-06-20 | 中国航空工业集团公司洛阳电光设备研究所 | Stroke type symbol generator and writing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 基于DSP和FPGA的新型笔划式字符发生器;李洁，等;《电光与控制》;20120630;第19卷(第6期);第58-61页 * |
| 基于DSP和FPGA的笔划字符发生器设计;刘翔，等;《航空电子技术》;20080930;第39卷(第3期);第50-54页 * |
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