WO2013040958A1 - 触摸控制器自适应电容式触摸传感器的方法及系统 - Google Patents

触摸控制器自适应电容式触摸传感器的方法及系统 Download PDF

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WO2013040958A1
WO2013040958A1 PCT/CN2012/079791 CN2012079791W WO2013040958A1 WO 2013040958 A1 WO2013040958 A1 WO 2013040958A1 CN 2012079791 W CN2012079791 W CN 2012079791W WO 2013040958 A1 WO2013040958 A1 WO 2013040958A1
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sensor
touch
capacitive
capacitive touch
touch controller
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PCT/CN2012/079791
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English (en)
French (fr)
Inventor
龙华
朱星火
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深圳市汇顶科技有限公司
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Publication of WO2013040958A1 publication Critical patent/WO2013040958A1/zh
Priority to US13/886,277 priority Critical patent/US9152282B2/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

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  • the invention belongs to the technical field of touch screens, and in particular relates to a method and system for a touch controller adaptive capacitive touch sensor.
  • Capacitive touch screens are widely used in mobile handheld electronic devices.
  • the capacitive touch screen is actually a transparent capacitive touch panel superimposed on the display.
  • the touch panel is usually a module integrating a capacitive touch sensor and a touch controller, wherein the touch controller performs touch detection on the capacitive touch sensor and detects The result is sent to the host board.
  • this touch panel is through a flexible circuit board (Flexible Printed The circuit, FPC) is connected to the main circuit board of the electronic device, and the touch controller is mounted on the FPC.
  • FPC Flexible Printed The circuit
  • the touch controller is required to preset various characteristic parameters of the capacitive touch sensor before the touch detection, in order to obtain a satisfactory detection result.
  • the touch controller and the capacitive touch sensor used are one-to-one binding, that is, each specific capacitive touch sensor needs to be used in a specific manner.
  • Model touch controller and corresponding firmware are one-to-one binding, that is, each specific capacitive touch sensor needs to be used in a specific manner.
  • the touch controller mounted on the host circuit board is capable of recognizing different types or touch sensors from a plurality of different suppliers, so that the touch controller can automatically adopt and use the specific touch sensor. Corresponding preset parameters to achieve the desired touch detection effect.
  • Figure 3 shows an example of a conventional method for solving this problem.
  • the touch controller uses a part of the IO port as the model selection input pins P1, P2...P6 in the wiring of the touch controller, and they are connected by simple switching circuits K1, K2...K6.
  • the touch controller can select the corresponding matching touch sensor model according to the input state of these selected input pins.
  • the disadvantage of this method is that it needs to occupy the IO port resources of the touch controller, and the circuit wiring also needs to occupy multiple pins on the FPC.
  • the IO port of the touch controller is often a very scarce resource, and increasing the pins of the FPC also increases the cost of the connector, which leads to the fact that this method cannot be truly implemented. Therefore, it is necessary to find a better and more reasonable technical solution.
  • the technical problem to be solved by the present invention is to provide a method and system for a touch controller adaptive capacitive touch sensor, which aims to enable the same touch controller to be used with different types of capacitive touch sensors.
  • the present invention is achieved by a method of a touch controller adaptive capacitive touch sensor, the capacitive touch sensor being coupled to a sensor type identification circuit based on a capacitive element; the method comprising the steps of:
  • Step A The touch controller performs detection and sampling on the capacitive component in the sensor model identification circuit, and parses the sampling data
  • Step B The touch controller selects a parameter corresponding to the sensor model according to the analysis result of step A to perform touch detection processing on the capacitive touch sensor.
  • step A specifically analyzes the sampling data by:
  • Step A1 the touch controller finds a maximum value in the sampled relative volume data, and formats and converts the maximum value according to a preset number of stages;
  • Step A2 format and convert other capacitance data according to a preset number of stages and a difference value of the relative capacitance data other than the maximum value with respect to the maximum value;
  • step A3 the current capacitive touch sensor model number is obtained according to the coded value obtained by formatting and converting all the relative capacitance data, and the correspondence between the predetermined code value and the sensor model.
  • the preset number of levels is a positive integer of 16 or less.
  • the preset number of levels is 2 or 4 or 8 or 16.
  • the present invention also provides a system for implementing a touch controller adaptive capacitive touch sensor, comprising: a host circuit board, a touch controller, a capacitive touch sensor, and a sensor model connected to the capacitive touch sensor Identifying a circuit; the touch controller is located on a host circuit board;
  • the touch controller is configured to sample the sensor model identification circuit, and parse the sample data, and then select corresponding parameters according to the analysis result to perform touch detection processing on the capacitive touch sensor.
  • the sensor model identification circuit includes a plurality of capacitor units
  • the touch controller first finds a maximum value in the sampled relative volume data, and formats the maximum value into a maximum code value according to a preset number of stages, and then according to the preset number of stages and the maximum The difference between the other relative capacitance data and the maximum relative capacitance data, the other relative capacitance data are separately formatted into corresponding encoded values, and finally the one obtained after the conversion is formatted with all relative capacitance data.
  • the group code value is used as the analysis result, and the model of the current capacitive touch sensor is obtained according to the correspondence between the pre-stored analysis result and the sensor model.
  • the sensor type identification circuit is a plurality of capacitive elements having a fixed capacitance value.
  • the sensor model identification circuit is disposed on the capacitive touch sensor, and includes a driving line and a sensing line;
  • the driving line multiplexes a driving electrode of the capacitive touch sensor or the sensing line multiplexes an sensing electrode of the capacitive touch sensor.
  • the present invention also provides a touch screen terminal comprising a display device and a system for implementing a touch controller adaptive capacitive touch sensor as described above.
  • the invention proposes to solve the identification problem of the capacitive touch sensor model by using the sensor model identification circuit, and gives a specific identification circuit structure and a method for collecting identification information and converting the module model code.
  • the technical scheme of the invention is simple and easy to implement, has low cost, and can be applied to various digital products adopting a capacitive touch screen, so that it is not only easy to replace different models or touch panel modules provided by different suppliers in the production process and the maintenance link. And can guarantee the ideal touch detection effect.
  • FIG. 1 is a schematic diagram of an electrical logic path of a conventional touch panel
  • FIG. 2 is a structural view of a conventional touch panel
  • FIG. 3 is a schematic diagram of a circuit for realizing sensor identification by using an external switch using an IO port
  • FIG. 4 is a flowchart of an implementation of a method for a touch controller adaptive capacitive touch sensor according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of obtaining the same analysis result from different adoption results of sensors of the same model according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a numerical conversion method with a hierarchical number of 2 according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a numerical conversion method for a hierarchical number k according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of an electrical logic path of a touch panel according to an embodiment of the present invention.
  • FIG. 9 is a structural diagram of a touch panel according to an embodiment of the present invention.
  • FIG. 10A and FIG. 10B are structural diagrams of a sensor model identification circuit according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of wiring of a sensor type identification circuit provided by an embodiment of the present invention at the same level;
  • FIG. 12 is a schematic diagram of wiring of a sensor model identification circuit provided at two opposite levels according to an embodiment of the present invention.
  • FIG. 13 is a diagram of a format conversion provided by an embodiment of the present invention.
  • the invention provides a sensor type identification circuit based on a capacitive device on the touch sensor module, so that the touch controller can identify the connected touch panel by detecting the code information contained in the capacitive device in the sensor type identification circuit.
  • the model number of the module so as to achieve the purpose of accurately using the corresponding detection parameters to achieve the best touch detection effect.
  • FIG. 4 is a flowchart showing an implementation process of a touch controller adaptive capacitive touch sensor according to an embodiment of the present invention, which is described in detail as follows:
  • step A the touch controller performs detection sampling on the capacitive elements in the sensor type identification circuit and parses the sampled data.
  • the capacitive touch sensor is connected with a sensor type identification circuit.
  • the sensor type identification circuit is implemented based on a capacitive device.
  • the capacitive device may be a plurality of standard capacitive elements having a fixed capacitance value, or may be the touch.
  • the two types of touch detection electrodes on the sensor are projected distributed capacitors (projected) formed by wiring Capacitance) may also be a self-capacitance of the electrode through the wiring formed by the sensing line on the touch sensor with respect to the reference ground.
  • the sampled in this step A is a set of relative capacitance data proportional to the capacitance of each capacitive element.
  • the "capacity conversion” (CDC) results obtained by sampling them respectively are: Vi1, Vi2...Vin, that is, a set of representative capacitances is obtained.
  • the relative capacitance data of the value (not the absolute capacitance of the capacitor itself).
  • the capacitive device Ci1 on the same type of sensor module is inevitably caused.
  • the capacitance values of Ci2...Cin are not exactly the same, and the relative capacitance data collected by these capacitor components cannot be fixed every time.
  • the relative value of each relative capacitance data is further formatted to obtain a coding result indicating the model number, that is, it is necessary to perform some format adjustment on the relative value of the obtained capacitance value.
  • This enables the same module model "d1d2...dn" to be derived from the Ci1, Ci2...Cin detection results on the same model.
  • Va1 is not equal to Vb1
  • Va2 is not equal to Vb2
  • Van is not equal to Vbn, but the result of their conversion is corresponding to the same set of results: d1, d2...dn.
  • the capacitances Ci1, Ci2...Cin in the sensor type identification circuit are necessarily required to be configured into some clearly distinguishable capacitance values in a specific implementation.
  • the so-called obvious distinction here depends on the discreteness of the capacitance fabrication and the accuracy of detecting the capacitance.
  • the ability to distinguish this distinction can usually be measured by the number of grades. For example, if the number of stages is 10, it means that the capacitors Ci1, Ci2...Cin can be configured into 10 different sizes of capacitance values, and even if the discreteness of the capacitance fabrication and the error of the detection process are taken into account, they can be distinguished. If the number of stages is 2, only the capacitors Ci1, Ci2...Cin are required to be made into two different sizes.
  • the lower the number of gradations the lower the requirements for the dispersion of the capacitance fabrication and the accuracy of the detection system.
  • a higher number of gradations indicates that a larger number of module model codes can be represented with a smaller number of capacitors.
  • the number of grades is 2, it means that a total of 8 capacitors are required for 256 models; and when the number of ranks is 16, it means that only 256 models need only use 2 capacitors.
  • Using fewer capacitors means simplifying design and saving costs. Therefore, under the premise of ensuring that the recognition result is stable and reliable, the design should be designed with a higher number of grades.
  • the parsing sample data described in step A may further include the following steps:
  • step A1 the touch controller finds a maximum value in the sampled relative volume data, and formats and converts the maximum value into a maximum code value determined by the preset number of stages.
  • step A2 other relative volume data is formatted into corresponding code values according to a preset number of stages and a difference value of the relative volume data other than the maximum value with respect to the maximum value.
  • step A3 the current capacitive touch sensor model number is obtained according to the coded value obtained by formatting and converting all the relative capacitance data, and the correspondence between the predetermined code value and the sensor model.
  • the preset number k is an integer value determined according to a predetermined format conversion method, and it must be suitable for the design specification of the sensor type identification circuit and the accuracy it can actually achieve and ensure accurate recognition results. . Since the capacitance value is an analog quantity and has discreteness, in order to ensure the certainty of the conversion result, when configuring the capacitance value of the capacitance in the sensor type identification circuit, it is necessary to determine the maximum allowable error range R to avoid confusion, and one of them.
  • the capacitance of the capacitor (for example, Cn) is set to the maximum Mk, and the code value is defined as (k-1).
  • the other capacitors are converted to their respective code values with reference to the capacitance data of the capacitor.
  • the size of R is generally set to two levels. In this way, the range of values corresponding to each code can be determined as a basis for format conversion. An example is as follows:
  • the resulting conversion result is actually a k-ary number.
  • k can be any positive integer greater than one.
  • the selected number k is less than or equal to 16, and it is most convenient to process the values of 2, 4, 8, and 16 by k.
  • the code for this set of conversion results is "320202". It is easy to see that even if there is a large deviation in the sampled data, the conversion result can remain unchanged.
  • C3 and C5 are encoded as 0 due to their set capacitance values, so they do not need to be made in the wiring of the model identification circuit, and they may be implicit.
  • the number of stages can be set to 2, and each model uses only one capacitive element to represent code 1.
  • the capacitor element coded as 0 does not need to be laid out. This can make the design of the type identification circuit And the conversion processing of the sampled data becomes very simple, and it is very easy to implement on various existing capacitive touch sensor module products.
  • step B the touch controller selects a parameter corresponding to the sensor model according to the analysis result of step A to perform touch detection processing on the capacitive touch sensor.
  • FIG. 8 and FIG. 9 respectively illustrate an electrical logic principle and structure of a system for implementing a touch controller adaptive capacitive touch sensor according to an embodiment of the present invention. For convenience of description, only parts related to the present embodiment are shown.
  • a system for implementing a touch controller adaptive capacitive touch sensor includes: a host circuit board, a touch controller, a capacitive touch sensor (referred to as a sensor), and a sensor model identification circuit.
  • the touch controller is located on the host circuit board, and the touch controller is used for sampling the sensor type identification circuit located on one side of the sensor, and parsing the sampled data, and then selecting corresponding parameters according to the analysis result to perform touch detection processing on the capacitive touch sensor. .
  • the difference between the embodiment shown in FIG. 8 and FIG. 9 is that the model identification circuit on the embodiment shown in FIG. 8 is placed in the touch sensor wiring area; the model identification circuit on the embodiment shown in FIG. 9 is placed on the sensor and the host.
  • FPC flexible printed circuit board
  • the FPC is fixedly connected to the sensor, and the host circuit board is connected through the active socket, so the sensor type identification circuit and the sensor are always integrated.
  • the sensor model identification circuit includes a plurality of capacitor units.
  • D1, D2...Dn are coupled to respective drive signal pins of the touch controller, and Si is coupled to a dedicated detection input pin on the touch controller.
  • S1, S2, ..., Sn are connected to respective sensing detection pins of the touch controller, and D is connected to a dedicated driving signal pin on the touch controller.
  • the touch controller detects the relative capacitance value of each capacitor (Ci1, Ci2...Cin) on the module type identification circuit, and can perform the conversion processing on the sampled relative capacitance value data to read the model code of the sensor.
  • D is connected to a common ground so that the type of sensor based on the principle of self-capacitance detection can be accommodated.
  • the touch controller first finds a maximum value in the sampled relative volume data, and formats the maximum value into a maximum code value according to a preset number of stages (when the number of stages is 2, the maximum code value is 1; When the number of ranks is 3, the maximum code value is 2, ... and so on.), and then according to the preset rank number and the difference between the relative volume data other than the maximum value and the maximum relative volume data Value, the other relative volume data is separately formatted into corresponding code values, and finally a set of code values obtained by formatting and transforming all relative volume data is used as an analysis result, and corresponding to the sensor model according to the pre-stored analysis result. Relationship, you can get the current model of capacitive touch sensor.
  • the preset number of stages is a positive integer of 16 or less, preferably 2, 4, 8, and 16.
  • the above sensor type identification circuit includes a plurality of capacitive elements having a fixed capacitance value, and the chip capacitive element may be selected in consideration of the size and material limitations of the actual sensor product.
  • these capacitive elements can also be obtained by wiring, that is, appropriately space between the driving line and the sensing line or between the sensing line and the common ground. The positional relationship, more precisely the coupling relationship, gives the required distributed capacitance.
  • FIG. 11 is a view showing a partial structure of an embodiment in which a capacitor device of a sensor type identification circuit obtains a capacitance by wiring at the same level, and the driving line D and the sensing line Si are arranged in parallel at a fine interval, and the adjacent side lengths l are adjusted by control. The spacing d is obtained to obtain the required distributed capacitance.
  • Fig. 12 is a view showing a partial structure of an embodiment of a capacitor type identification circuit for obtaining a capacitance by wiring at two opposite levels, and arranging the drive line D and the induction line Si in such a manner as to form a laminated parallel plane trace: two overlaps are adjusted by control The thickness of the parallel plane spacing and the area Ci of the laminated portion are obtained to obtain the required distributed capacitance capacity. It should be added that the required distribution capacitance value is also related to the materials to which the wiring is attached, the processing accuracy, and the specific mounting position.
  • all of the sensing electrodes and the driving electrodes are connected to corresponding pins of the touch controller, and those skilled in the art can easily understand that the required touch controller can be saved by multiplexing the driving electrodes or the sensing electrodes. The number of pins.
  • FIG. 8 and FIG. 9 and the above text are described by taking the touch controller on the host line as an example.
  • the touch controller may also be installed on the FPC together with the sensor type identification circuit.
  • the above system implementing the touch controller adaptive capacitive touch sensor can be applied to any capacitive touch screen terminal.

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Abstract

提供了一种触摸控制器自适应电容式触摸传感器的方法及系统。方法包括下述步骤：步骤A，触摸控制器对传感器型号识别电路中的电容元件进行检测采样，并解析采样数据；步骤B，触摸控制器根据步骤A的解析结果选取与传感器型号相对应的参数对电容式触摸传感器进行触摸检测处理。系统包括主机电路板、触摸控制器、电容式触摸传感器、与所述电容式触摸传感器连接的传感器型号识别电路，所述触摸控制器位于主机电路板上。采用上述方法及系统使得在生产环节和维修环节置换不同型号或由不同供应商提供的触摸面板模组不仅变得容易，而且可以保证获得理想的触摸检测效果。

Description

触摸控制器自适应电容式触摸传感器的方法及系统 技术领域
本发明属于触摸屏技术领域，尤其涉及一种触摸控制器自适应电容式触摸传感器的方法及系统。
背景技术
电容式触摸屏在移动手持电子设备中得到了广泛的应用。电容式触摸屏实际上是显示屏上面叠加了一层透明的电容式触摸面板。目前在产品设计和生产实践中，几乎所有电容式触摸屏都采取了类似的电路形式与结构形式。如图1所示，从电路逻辑原理角度看，这个触摸面板通常是一个集成了电容式触摸传感器与触摸控制器的模组，其中的触摸控制器对电容式触摸传感器进行触摸检测，并将检测结果送给主机电路板。如图2所示，从结构角度看，这个触摸面板是通过柔性电路板（Flexible Printed Circuit，FPC）连接到电子设备的主电路板上去的，并且触摸控制器是安装在该FPC上的。根据电容式触摸检测技术的实现原理，需要触摸控制器在进行触摸检测前预设好与之配套的电容式触摸传感器的各种特征参数，才能得到满意的检测结果。鉴于电容式触摸检测技术的特点，在这类应用方式中，触摸控制器与所用的电容式触摸传感器是属于一一对应捆绑配套的关系，也就是各个特定的电容式触摸传感器都需要配套使用特定型号的触摸控制器和相应的固件。
但是，在大规模生产实践中，出于简化生产工艺和控制采购成本的考虑，厂家往往希望将触摸控制器安装到主机电路板上，并且希望能够给同一个触控产品配套不同型号或由不同供应商提供的不带触摸控制器的触摸传感器模组。于是提出了新的技术问题：要让安装在主机电路板上的触摸控制器做到能够识别不同型号或来自多个不同供应商的触摸传感器，以便能够让触摸控制器自动采用与所用特定触摸传感器相对应的预设参数从而获得理想的触摸检测效果。图3给出了解决这个问题的一个传统方法的例子，就是在触摸控制器的布线当中使用部分IO端口作为型号选择输入脚P1、P2…P6，通过简单的开关电路K1、K2…K6将他们接入不同的高低电平组合，即可做到让触摸控制器根据这些选择输入脚的输入状态选择相应的配套触摸传感器型号。这种方法的缺点是需要占用触摸控制器的IO端口资源，而且电路布线上也需要占用FPC上的多个引脚。触摸控制器的IO端口往往是非常紧缺的资源，而增加FPC的引脚也会提高连接器的成本，这也就导致了这个办法无法真正得到普遍实行。因此，需要寻找更好更加合理的技术方案。
 技术问题
本发明所要解决的技术问题在于提供一种触摸控制器自适应电容式触摸传感器的方法及系统，旨在使同一个触摸控制器可以与不同型号的电容式触摸传感器配套使用。
技术解决方案
本发明是这样实现的，一种触摸控制器自适应电容式触摸传感器的方法，所述电容式触摸传感器连接一基于电容元件的传感器型号识别电路；所述方法包括下述步骤：
步骤A，触摸控制器对所述传感器型号识别电路中的电容元件进行检测采样，并解析采样数据；
步骤B，触摸控制器根据步骤A的解析结果选取与传感器型号相对应的参数对所述电容式触摸传感器进行触摸检测处理。
进一步地，所述步骤A具体通过以下方式解析采样数据：
步骤A1，触摸控制器在采样得到的相对容值数据中找到最大值，并根据预设的分级数将此最大值进行格式化转换；
步骤A2，根据预设的分级数以及除所述最大值之外其他相对容值数据相对于最大值的差值，将其他容值数据进行格式化转换；
步骤A3，根据对所有相对容值数据进行格式化转换得到的编码值，以及预定的编码值与传感器型号的对应关系，得到当前电容式触摸传感器的型号。
进一步地，所述预设的分级数为小于等于16的正整数。
进一步地，所述预设的分级数为2或4或8或16。
本发明还提供了一种实现触摸控制器自适应电容式触摸传感器的系统，其特征在于，包括：主机电路板、触摸控制器、电容式触摸传感器、与所述电容式触摸传感器连接的传感器型号识别电路；所述触摸控制器位于主机电路板上；
所述触摸控制器用于对所述传感器型号识别电路进行采样，并解析采样数据，然后根据解析结果选取相应的参数对所述电容式触摸传感器进行触摸检测处理。
进一步地，所述传感器型号识别电路包含有若干电容单元；
所述触摸控制器首先在采样得到的相对容值数据中找到最大值，并根据预设的分级数将此最大值格式化转换成最大编码值，然后根据预设的分级数以及除所述最大值之外的其他相对容值数据与最大相对容值数据的差值，将其它相对容值数据分别格式化转换成对应的编码值，最后以所有相对容值数据格式化转换后所得到的一组编码值作为解析结果，根据预存的解析结果与传感器型号的对应关系，得到当前电容式触摸传感器的型号。
进一步地，所述传感器型号识别电路为若干具有固定容值的电容元件。
进一步地，所述传感器型号识别电路布设于所述电容式触摸传感器上，包括驱动线和感应线；
其中，所述驱动线复用所述电容式触摸传感器的驱动电极或所述感应线复用所述电容式触摸传感器的感应电极。
本发明还提供了一种触摸屏终端，包括一显示装置和一如上所述的实现触摸控制器自适应电容式触摸传感器的系统。
 有益效果
本发明提出用传感器型号识别电路解决电容式触摸传感器型号的识别问题，给出了具体的识别电路结构以及采集识别信息和转换出模组型号编码的方法。本发明技术方案简单易于实施、成本低，可应用于采用电容式触摸屏的各类数码产品上，使得在生产环节和维修环节置换不同型号或由不同供应商提供的触摸面板模组不仅变得容易，而且可以保证获得理想的触摸检测效果。
 附图说明
图1是现有的触摸面板的电逻辑路原理图；
图2是现有的触摸面板的结构图；
图3是现有的采用IO端口通过外接开关实现传感器型号识别的线路原理图；
图4是本发明实施例提供的触摸控制器自适应电容式触摸传感器的方法的实现流程图；
图5是本发明实施例提供的从相同型号的传感器的不同采用结果中获得相同解析结果的原理图；
图6是本发明实施例提供的分级数为2的数值转换方法示意图；
图7是本发明实施例提供的分级数为k的数值转换方法示意图；
图8是本发明实施例提供的触摸面板的电逻辑路原理图；
图9是本发明实施例提供的触摸面板的结构图；
图10A和图10B是本发明实施例提供的传感器型号识别电路的结构图；
图11是本发明实施例提供的传感器型号识别电路在同一层面布线的示意图；
图12是本发明实施例提供的传感器型号识别电路在两个相对层面布线的示意图；
图13是本发明实施例提供的一格式化转换的图表。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明通过在触摸传感器模组上设置一基于电容器件的传感器型号识别电路，使触摸控制器通过检测此传感器型号识别电路读出其中的电容器件所包含的编码信息，即可识别所连接触摸面板模组的型号，从而达到准确采用相应的检测参数实现最佳的触摸检测效果的目的。
图4示出了本发明实施例提供的触摸控制器自适应电容式触摸传感器的方法的实现流程，详述如下：
在步骤A中，触摸控制器对所述传感器型号识别电路中的电容元件进行检测采样，并解析采样数据。
本发明中，电容式触摸传感器连接有一传感器型号识别电路，此传感器型号识别电路是基于电容器件实现的，这些电容器件具体可以是若干具有固定容值的标准电容元件，也可以是以所述触摸传感器上的驱动线和感应线这两种触摸检测电极通过布线方式构成的投射式分布电容（projected capacitance），还可以是以所述触摸传感器上的感应线检测电极通过布线构成的相对于参考地的自电容(self-capacitance)。此步骤A中采样得到的是一组与各电容元件的容值成比例关系的相对容值数据。例如，对于识别电路中的一组电容Ci1，Ci2…Cin而言，分别将对它们采样获得的“容数转换”（CDC）结果为：Vi1，Vi2…Vin，也就是得到一组表征电容容值的相对容值数据（并非电容的绝对容值本身）。考虑到最初转换得到的相对容值数据虽然包含了识别传感器模组型号的信息，但是由于实际产品上电路制作的离散性以及检测结果中的误差，必然导致同型号传感器模组上的电容器件Ci1，Ci2…Cin的电容值并不会精确的一致，而且对这些电容器件采集到的相对容值数据也不可能每次都是固定不变的。因此为了记录和识别的方便，进一步将每个相对容值数据的相对值进行格式化，以得到表示型号的编码结果，也就是说，有必要对获得的电容数值的相对值进行某种格式调整，使得能够从同型号模组上的Ci1，Ci2…Cin检测结果中导出相同的模组型号“d1d2…dn”。如图5所示，虽然Va1不等于Vb1，Va2不等于Vb2，Van不等于Vbn，但是它们转化出来的结果却是对应同样的一组结果：d1，d2…dn。
按照上面介绍的方法，传感器型号识别电路中的电容Ci1，Ci2…Cin在具体实施中必然会要求被配置成一些可以明显区分的电容值。这里所谓的明显区分，取决于电容制作的离散性以及对电容进行检测的精确度。通常可以用分级数来衡量这种区分的能力。例如，如果分级数为10，则说明电容Ci1，Ci2…Cin可以配制成10种不同大小的电容值，即使把电容制作的离散性以及检测过程的误差考虑进去，仍然可以区分它们。如果分级数为2，则只要求将电容Ci1，Ci2…Cin配制成两种不同的大小即可。显然，分级数越低，对于电容制作的离散性以及检测系统的精确度就要求越低。另一方面，分级数较高，则表示可以采用较少数量的电容就可以表示较多数量的模组型号编码。举例说明：分级数为2时，表示256个型号总共需要使用8个电容；而分级数为16时，表示256个型号总共只需要使用2个电容。而使用较少的电容数量，就意味着简化了设计和节省了成本。因此，在保证识别结果稳定可靠的前提下，应当尽量采取较高的分级数进行设计。
基于上述考虑，步骤A所述的解析采样数据又可进一步包括下述步骤：
步骤A1，触摸控制器在采样得到的相对容值数据中找到最大值，并将此最大值进行格式化转换，以转换成由预设分级数所决定的最大编码值。
步骤A2，根据预设的分级数以及除所述最大值之外其他相对容值数据相对于最大值的差值，将其他相对容值数据格式化转换成对应的编码值。
步骤A3，根据对所有相对容值数据进行格式化转换得到的编码值，以及预定的编码值与传感器型号的对应关系，得到当前电容式触摸传感器的型号。
其中的预设分级数k，是根据预定的格式化转换方式定出的一个整数值，它必须适合传感器型号识别电路的设计规格和它实际所能达到的精确度并保证能够导致准确的识别结果。由于电容值是一种模拟量，具有离散性，为了保证转换结果的确定性，在配置传感器型号识别电路中电容的容值时，需要确定避免混淆的最大容许的误差范围R，并将其中一个电容（例如Cn）的容值设定为最大Mk，其编码值定义为（k-1），其它电容均以这个电容的容值数据为参照进行转换而的到各自的编码值。为了简化计算处理起见，一般将R的大小设为两级之差。这样就可以确定各编码对应的取值范围，以此作为格式化转换的依据。举例说明如下：
一个实施例将分级数预设为2，参见图6，这个实施例中采集到的最大相对容值数据为M2，则 R=2M2/3，M1=R/2=M2/3。这样，如果一个容值数据落在（M1±R/2）范围内，那么，它对应的编码值就是0；如果一个容值数据落在（M2±R/2）范围内，它对应的编码值就是1。
另一个实施例将分级数定为k，参加图7，这个实施例中采集到的最大相对容值数据为Mk，则R=2Mk/(2k-1)，M1=R/2，M2=3R/2，…。由此，即可以确定出各个级别区间的取值范围,并对落在各取值区间的相对容值数据进行格式化转换，得到它们各自的编码值。
需要说明的是，在上述实施例方案中，两个相邻的级别区间存在一个重叠的值，例如，M1+R/2 = M2-R/2，等等。如果一个采集到的容值数据恰好落在这个值上，就会得到不可靠的结果。避免这个问题的措施在于选择合适的分级数k，使得实际上的采集数据集中都分布在最靠近各自级别区间中央的部分。从这里可以看出，只有较高精度的元件参数以及检测精度，才能允许选择较多的分级数。
按照上面介绍的实施例方案可以，所得到的转换结果实际上是一个k进制的数。理论上k可以为任何大于1的正整数。考虑到触摸控制器处理的方便以及实际电路的精度等因素，选取的分级数k小于等于16，其中又以k取2、4、8、16这几个值处理起来最为便捷。例如，在一个实施例中，分级数k取4，用6个电容元件，考虑到有一个是固定的最大容值，这时所能表示的传感器模组型号总数为：4*4*4*4*4=46=1024。
下面给出一个具体的格式化转换实施例，参见图13所示的表格中的数据。图13中列出了两个传感器模组上型号识别电路的采样结果，即对电容元件C1至C6的采样值（以十进制表示），其中最大值是C1的采样值为800。设所采用的分级数为4，则其编码所用的几个数值为0、1、2、和3，按照前面给出的步骤和规则可以确定各编码值对应的采样值取值范围为：
0：（0-300）；1：（301-500）；2：（501-700）；3：（701-900）
以此为格式化转换依据，即可得出此组转换结果的编码为“320202”。很容易看出，即使采样数据还有较大的偏差变化，这个转换结果还是可以保持不变的。
在图13所示的这个实施例中，事实上C3和C5由于它们的设定容值编码为0，因此它们是不需要在型号识别电路的布线中做出来，它们可以是隐含的。
作为另一种最简化的实施方案，可以将分级数定为2，并且每个型号只使用一个电容元件代表编码1，编码为0的电容元件无需布设出来，这样做可以使得型号识别电路的设计以及对采样数据的转换处理都变得非常简单，也非常易于在现有的各种电容式触摸传感器模组产品上实施。
在步骤B，触摸控制器根据步骤A的解析结果选取与传感器型号相对应的参数对所述电容式触摸传感器进行触摸检测处理。
由于对于不同型号的电容式触摸传感器往往在采用的材质、走线布图、结构以及加工工艺等等方面是不一样的，一定需要触摸控制器采用与之相应的参数才能得到适当的触摸检测效果，获得满意的灵敏度、线性度、分辨率等技术指标。
本领域普通技术人员可以理解实现上述各实施例提供的方法中的全部或部分步骤可以通过程序来指令相关的硬件来完成，所述的程序可以存储于一计算机可读取存储介质中，该存储介质可以为ROM/RAM、磁盘、光盘等。
图8和图9分别示出了本发明实施例提供的实现触摸控制器自适应电容式触摸传感器的系统的电逻辑原理和结构，为了便于描述，仅示出了与本实施例相关的部分。
参照图8和图9本发明实施例提供的实现触摸控制器自适应电容式触摸传感器的系统包括：主机电路板、触摸控制器、电容式触摸传感器（简称传感器）、传感器型号识别电路。其中，触摸控制器位于主机电路板上，触摸控制器用于对位于传感器一侧的传感器型号识别电路进行采样，并解析采样数据，然后根据解析结果选取相应的参数对电容式触摸传感器进行触摸检测处理。图8和图9所示实施例的区别在于，图8所示实施例上的型号识别电路放置在触摸传感器布线区域内；图9所示实施例上的型号识别电路放置在连接于传感器与主机电路板的柔性印刷电路板（FPC）上面。而FPC与传感器是固定连接的，与主机电路板则是通过活动插座连接的，所以传感器型号识别电路与传感器总是保持一体。
进一步地，传感器型号识别电路包含有若干电容单元。如图10A所示，在一个实施例中，D1、D2…Dn连接到触摸控制器的相应驱动信号脚，Si连接到触摸控制器上一路专用的检测输入脚。在另个一实施例中，如图10B所示，S1、S2…Sn连接到触摸控制器的相应感应检测脚，D连接到触摸控制器上一路专用的驱动信号脚。触摸控制器检测模组型号识别电路上的各个电容（Ci1、Ci2…Cin）的相对电容值，通过对采样得到的相对电容值数据进行一定的转换处理，即可读取到这个传感器的型号编码。在另一个实施例中，如图10B所示，D连接到公共地，从而可以适应基于自电容检测原理的传感器类型。
所述触摸控制器首先在采样得到的相对容值数据中找到最大值，并根据预设的分级数将此最大值格式化转换成最大编码值（分级数为2时，最大编码值为1；分级数为3时，最大编码值是2，...依此类推。），然后根据预设的分级数以及除所述最大值之外的其他相对容值数据与最大相对容值数据的差值，将其它相对容值数据分别格式化转换成对应的编码值，最后以所有相对容值数据格式化转换后所得到的一组编码值作为解析结果，根据预存的解析结果与传感器型号的对应关系，即可得到当前电容式触摸传感器的型号。如上文所述，预设的分级数为小于等于16的正整数，优选值为2、4、8、16。
上述传感器型号识别电路包括有若干具有固定容值的电容元件，考虑到实际的传感器产品在尺寸大小和材质方面的限制，可以选用贴片电容元件。但是，作为一种更为低成本的替代设计方案，在实施中这些电容元件也可以通过布线的方式获得，也就是适当地布设驱动线与感应线之间或者感应线与公共地之间的空间位置关系，更准确地讲是耦合关系，从而得到所需的分布电容。图11表示传感器型号识别电路的电容器件通过在同一层面布线获得电容的实施例的局部结构，以细小间隔平行走线的方式布设驱动线D和感应线Si，通过控制调整相邻边长l与间距d而获得所需的分布电容。图12表示传感器型号识别电路的电容器件通过在两个相对层面布线获得电容的实施例的局部结构，以形成层叠平行平面走线的方式布设驱动线D和感应线Si：通过控制调整两个重叠平行平面间隔的厚度和层叠部分的面积Ci而获得所需的分布电容容量。需要补充说明的是，获得所需的分布电容值还与布线所依附的材料、加工精度以及具体安装位置等因素有关。
在上述各个具体实施例中，所有感应电极和驱动电极均连接到触摸控制器的相应引脚，本领域技术人员不难了解，通过复用驱动电极或感应电极，可以节省所需要的触摸控制器引脚数量。
应当理解，图8、图9和上述文字以触摸控制器位于主机线路上为例进行了说明，具体实施时，触摸控制器还可与传感器型号识别电路一同安装在FPC上。
上述实现触摸控制器自适应电容式触摸传感器的系统可应用于任何电容式触摸屏终端。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种触摸控制器自适应电容式触摸传感器的方法，其特征在于，所述电容式触摸传感器连接一基于电容元件的传感器型号识别电路；所述方法包括下述步骤：
    步骤A，触摸控制器对所述传感器型号识别电路中的电容元件进行检测采样，并解析采样数据；
    步骤B，触摸控制器根据步骤A的解析结果选取与传感器型号相对应的参数对所述电容式触摸传感器进行触摸检测处理。
  2. 如权利要求1所述的方法，其特征在于，所述步骤A具体通过以下方式解析采样数据：
    步骤A1，触摸控制器在采样得到的相对容值数据中找到最大值，并根据预设的分级数将此最大值进行格式化转换；
    步骤A2，根据预设的分级数以及除所述最大值之外其他相对容值数据相对于最大值的差值，将其他容值数据进行格式化转换；
    步骤A3，根据对所有相对容值数据进行格式化转换得到的编码值，以及预定的编码值与传感器型号的对应关系，得到当前电容式触摸传感器的型号。
  3. 如权利要求2所述的方法，其特征在于，所述预设的分级数为小于等于16的正整数。
  4. 如权利要求3所述的方法，其特征在于，所述预设的分级数为2或4或8或16。
  5. 一种实现触摸控制器自适应电容式触摸传感器的系统，其特征在于，包括：主机电路板、触摸控制器、电容式触摸传感器、与所述电容式触摸传感器连接的传感器型号识别电路；所述触摸控制器位于主机电路板上；
    所述触摸控制器用于对所述传感器型号识别电路进行采样，并解析采样数据，然后根据解析结果选取相应的参数对所述电容式触摸传感器进行触摸检测处理。
  6. 如权利要求5所述的系统，其特征在于：
    所述传感器型号识别电路包含有若干电容单元；
    所述触摸控制器首先在采样得到的相对容值数据中找到最大值，并根据预设的分级数将此最大值格式化转换成最大编码值，然后根据预设的分级数以及除所述最大值之外的其他相对容值数据与最大相对容值数据的差值，将其它相对容值数据分别格式化转换成对应的编码值，最后以所有相对容值数据格式化转换后所得到的一组编码值作为解析结果，根据预存的解析结果与传感器型号的对应关系，得到当前电容式触摸传感器的型号。
  7. 如权利要求6所述的系统，其特征在于，所述传感器型号识别电路为若干具有固定容值的电容元件。
  8. 如权利要求6所述的系统，其特征在于，所述传感器型号识别电路布设于所述电容式触摸传感器上，包括驱动线和感应线；
    其中，所述驱动线复用所述电容式触摸传感器的驱动电极或所述感应线复用所述电容式触摸传感器的感应电极。
  9. 如权利要求6所述的系统，其特征在于，所述预设的分级数为小于等于16的正整数。
  10. 一种触摸屏终端，其特征在于，包括一显示装置和一如权利要求5至9任一项所述的实现触摸控制器自适应电容式触摸传感器的系统。
PCT/CN2012/079791 2011-09-19 2012-08-07 触摸控制器自适应电容式触摸传感器的方法及系统 WO2013040958A1 (zh)

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