CN103699241A - Coordinate detection method for PDP touch pen - Google Patents
Coordinate detection method for PDP touch pen Download PDFInfo
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- CN103699241A CN103699241A CN201310706388.2A CN201310706388A CN103699241A CN 103699241 A CN103699241 A CN 103699241A CN 201310706388 A CN201310706388 A CN 201310706388A CN 103699241 A CN103699241 A CN 103699241A
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Abstract
The invention provides a coordinate detection method for a PDP touch pen. The method comprises the steps that a receiving plate sends a synchronization pulse signal to the touch pen in a wireless mode after receiving a synchronization pulse generated by a logic plate; the touch pen outputs three pulses in different time widths successively; the three pulses are correlative to output signals of a light detection circuit; a Y light pulse, a reference pulse and an X light pulse are extracted; and coordinate information calculation is performed through the reference pulse, the X light pulse and the Y light pulse. According to the method, the characteristic of the touch pen is used, instable factors in wireless communication are overcome, and the coordinate detection accuracy is improved.
Description
Technical field
The application relates generally to plasma style of writing technical field, specifically a kind of coordinate detection method for PDP felt pen.
Background technology
The method that plasma style of writing technology utilizes subfield to drive, in subfield between non-display area, produce XY coordinate light signal, the infrared ray with the device sensing Plasmia indicating panel generation of photosensitive property, detect the contact position of photosensitive device and display panel, by felt pen, realize the touch control operation of large-sized monitor, have that display system cost is low, different size shows property strong adaptability, touch-control fast response time, can detect the technical characterstics such as XY coordinate.
In technology originally, adopt and directly receive wireless synchronization signal as the time reference of coordinates computed, and radio communication is easy to be subject to external interference, thereby time of reception point can produce the error that shake causes that coordinate calculates like this.
Summary of the invention
For addressing the above problem, the invention provides a kind of coordinate detection method for PDP felt pen, comprise the following step:
The dash receiver of step 1:PDP display system receives after the synchronizing pulse of logic card generation, by wireless mode, this synchronization pulse is sent to felt pen;
Step: 2: felt pen receives the pulse of exporting successively three different time width after this synchronization pulse;
Step 3: described three pulses all with optical detection circuit output signal phase with;
Step 4: from step 3 with result extract Y light pulse, basic pulse, X-ray pulse;
Step 5: the basic pulse being drawn by step 4, X-ray pulse, Y light pulse calculate coordinate information.
Further, the pulse of three different in width according to generation time successively, is respectively used to be calculated as Y light pulse, basic pulse and X-ray pulse.
Further, in step 2, felt pen be after receiving synchronization pulse successively at 560 us, 1610us, the pulse of three different in width of 2300us time point output.
Further, for calculating the burst length width of X-ray pulse, be 550～600us.。
Further, described is 40～55us for calculating the burst length width of basic pulse.。
Further, for calculating the burst length width of Y light pulse, be 950～1050us.
Further, describedly for calculating the width of basic pulse, whole basic pulse can be included completely.
Further, basic pulse is that the pulse that maintains by the first subfield maintenance phase set time and quantity produces
Further, calculate Y light pulse negative edge to the time interval of pulse reference time, X-ray pulse negative edge all be take basic pulse negative edge as time reference point to the time interval of pulse reference time.
Beneficial effect of the present invention is:
The present invention receives after wireless synchronization signal at felt pen, the pulse of exporting three different in width within the specific time, with optical detection circuit output signal phase with, extract X, Y light pulse and basic pulse, because basic pulse is that the pulse that maintains by the first subfield set time and quantity produces, be not subject to the impact of radio communication, have very high precision, the coordinate information being calculated by this basic pulse and X, Y pulse has very high precision too.The present invention utilizes the feature of felt pen waveform itself, has overcome labile factor in radio communication, has improved the precision of coordinate measurement.
Accompanying drawing explanation
Fig. 1 is the pulse waveform design that in prior art, PDP display system coordinate calculates.
Fig. 2 is the pulse waveform design that in the present invention, PDP display system coordinate calculates.
Embodiment
PDP display system consists of logic card, dash receiver, felt pen and display screen etc.Wherein dash receiver receives after the synchronizing pulse of logic card generation, by wireless mode, wireless synchronization signal is sent to felt pen.In existing method, felt pen receives after wireless signal, directly the time reference point using this time point as coordinates computed.According to the regular hour, produce successively two pulses and obtain Y light pulse and X-ray pulse information (as shown in Figure 2) simultaneously.Y light pulse negative edge is Ty to the time interval of pulse reference time, X-ray pulse negative edge to the time interval of pulse reference time be Tx.When felt pen is on screen during diverse location, Ty and Tx are different, and this corresponding relation is unique.Therefore, when the pulse that software is produced and light pulse signal are through when being input to behind the door an interruption of single-chip microcomputer in felt pen, can produce and interrupt at different time, in software, by timer, obtain time difference, and according to certain parameter, be converted to the physical location of light pulse.
More than having a problem, is exactly that 2.4G radio communication has certain unreliability.Although that is to say that the time of dash receiver transmission wireless synchronization signal is accurate, but felt pen receives the time of this wireless synchronization signal and shakes, such result is when felt pen is fixed on a position, and Tx and Ty also can correspondingly shake, thus cause coordinate there are errors in computation poor.
In order to address this problem, the present invention has carried out corresponding improvement to it, and two illuminated message that maintain pulse of its ultimate principle utilization after the first subfield are used as the time reference calculating.Because this basic pulse is that the pulse that maintains by the first subfield maintenance phase set time and quantity produces, so this position fixes, and can not be subject to the interference of external environment.It doesn't matter with radio communication, therefore can improve the precision of coordinate measurement.Specific implementation is shown in Fig. 2.
The present invention can be summarized as following five steps:
The dash receiver of step 1:PDP display system receives after the synchronizing pulse of logic card generation, by wireless mode, this synchronization pulse is sent to felt pen.
Step: 2: felt pen is exported the pulse of three different time width successively.
Felt pen after receiving synchronization pulse successively at 560 us, 1610us, the pulse of three different in width of 2300us time point output, the pulse of described three different in width according to generation time successively, is respectively used to be calculated as Y light pulse, basic pulse and X-ray pulse.
Described is 550～600us for calculating the burst length width of X-ray pulse;
Basic pulse is that the pulse that maintains by the first subfield maintenance phase set time and quantity produces, so this position fixes, and can not be subject to the interference of external environment.
Described is 40～55us for calculating the burst length width of basic pulse.For calculating the pulse of basic pulse, it is one of innovative point of the present invention.This time width can enoughly be included whole basic pulse completely.Even if receive like this time of wireless synchronization signal, there is shake to cause the starting point of pulse to have shake, but constant with calculating point reference time producing afterwards with optical detection circuit output signal phase, the coordinate figure X, the Y that by formula, convert out are like this also constant, have improved the precision that coordinate gathers.
For being calculated as the burst length width of Y light pulse, be 950～1050us.
Step 3: described three pulses with optical detection circuit output signal phase with;
Step 4: from step 3 with result extract Y light pulse, basic pulse, X-ray pulse;
Step 5: the basic pulse being drawn by step 4, Y light pulse, X-ray pulsimeter are calculated coordinate information.
Circular is:
Because value in program counter and felt pen are linear relationship in the position of Y-direction:
Z?=?a*N?+?b
Suppose when felt pen is positioned at the 1st row, with the basic pulse time interval be tY1, value in program counter is NY1; When felt pen is positioned at the 768th row, with the basic pulse time interval be tY768, value in program counter is NY768.Can draw like this a=(NY768-NY1)/(768 – 1), b=a* NY768 – 768.Like this, when felt pen is positioned at the upper any a line of screen, program obtains a count value NY, and we can utilize above-mentioned formula to obtain Y coordinate position.
Profit uses the same method, and can obtain X coordinate position.
Calculate Y light pulse negative edge to the time interval of pulse reference time, X-ray pulse negative edge all be take basic pulse negative edge as time reference point to the time interval of pulse reference time.
Beneficial effect of the present invention is:
The present invention receives after wireless synchronization signal at felt pen, the pulse of exporting three different in width within the specific time, with optical detection circuit output signal phase with, extract X, Y light pulse and basic pulse, because basic pulse is that the pulse that maintains by the first subfield set time and quantity produces, be not subject to the impact of radio communication, have very high precision, the coordinate information being calculated by this basic pulse and X, Y pulse has very high precision too.The present invention utilizes the feature of felt pen waveform itself, has overcome labile factor in radio communication, has improved the precision of coordinate measurement.
Claims (9)
1. for a coordinate detection method for PDP felt pen, it is characterized in that, comprise the following step:
The dash receiver of step 1:PDP display system receives after the synchronizing pulse of logic card generation, by wireless mode, this synchronization pulse is sent to felt pen;
Step: 2: felt pen receives the pulse of exporting successively three different time width after this synchronization pulse;
Step 3: described three pulses all with optical detection circuit output signal phase with;
Step 4: from step 3 with result extract Y light pulse, basic pulse, X-ray pulse;
Step 5: the basic pulse being drawn by step 4, X-ray pulse, Y light pulse calculate coordinate information.
2. the coordinate detection method for PDP felt pen as claimed in claim 1, is characterized in that, the pulse of three different in width according to generation time successively, is respectively used to be calculated as Y light pulse, basic pulse and X-ray pulse.
3. the coordinate detection method for PDP felt pen as claimed in claim 1 or 2, is characterized in that, in step 2, felt pen be after receiving synchronization pulse successively at 560 us, 1610us, the pulse of three different in width of 2300us time point output.
4. the coordinate detection method for PDP felt pen as claimed in claim 1 or 2, is characterized in that, for calculating the burst length width of X-ray pulse, is 550～600us.
5. the coordinate detection method for PDP felt pen as claimed in claim 1 or 2, is characterized in that, described is 40～55us for calculating the burst length width of basic pulse.
6. the coordinate detection method for PDP felt pen as claimed in claim 1 or 2, is characterized in that, for calculating the burst length width of Y light pulse, is 950～1050us.
7. the coordinate detection method for PDP felt pen as claimed in claim 5, is characterized in that, describedly for calculating the width of basic pulse, whole basic pulse can be included completely.
8. the coordinate detection method for PDP felt pen as claimed in claim 1 or 2, is characterized in that, basic pulse is that the pulse that maintains by the first subfield maintenance phase set time and quantity produces.
9. the coordinate detection method for PDP felt pen as claimed in claim 1 or 2, it is characterized in that, calculate Y light pulse negative edge and all take basic pulse negative edge as time reference point to time interval of pulse reference time, X-ray pulse negative edge to the time interval of pulse reference time.
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| CN201310706388.2A CN103699241A (en) | 2013-12-20 | 2013-12-20 | Coordinate detection method for PDP touch pen |
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| CN201310706388.2A CN103699241A (en) | 2013-12-20 | 2013-12-20 | Coordinate detection method for PDP touch pen |
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| CN102681715A (en) * | 2010-12-31 | 2012-09-19 | 乐金显示有限公司 | Apparatus and method for driving touch sensor |
| CN103050078A (en) * | 2012-12-24 | 2013-04-17 | 四川虹欧显示器件有限公司 | Plasma display touch wireless operation system and operation method |
| CN103065573A (en) * | 2012-12-30 | 2013-04-24 | 四川虹欧显示器件有限公司 | Plasma panel optical pulse signal detection device |
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| CN1475897A (en) * | 2002-07-30 | 2004-02-18 | ������������ʽ���� | Coordinate input device and its controlling method, and program |
| CN102135840A (en) * | 2010-01-21 | 2011-07-27 | 三星Sdi株式会社 | Electronic pen for detecting touch location, controlling method of the same, and driving method of plasma display apparatus |
| CN102681715A (en) * | 2010-12-31 | 2012-09-19 | 乐金显示有限公司 | Apparatus and method for driving touch sensor |
| CN103050078A (en) * | 2012-12-24 | 2013-04-17 | 四川虹欧显示器件有限公司 | Plasma display touch wireless operation system and operation method |
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Application publication date: 20140402 |