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< div class = "date inPage" > 9 Apr 2025< / div > < div style = "color: gray;" >
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Read time: 2 minute(s)
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< section class = "- topic/section section" id = "rtp_working_logic__section_dwc_lry_21c" data-ofbid = "rtp_working_logic__section_dwc_lry_21c" > < h2 class = "- topic/title title sectiontitle" > 硬件结构原理< / h2 >
< figure class = "- topic/fig fig fignone" id = "rtp_working_logic__fig_v5m_zry_21c" data-ofbid = "rtp_working_logic__fig_v5m_zry_21c" >
< br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "rtp_working_logic__image_ewc_lry_21c" src = "../../../images/rtp/rtp_hw_structure.png" width = "288" alt = "hw_structure" / > < / div > < br / >
< figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 1< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > RTP 硬件结构侧视图< / span > < / figcaption > < / figure >
< p class = "- topic/p p" data-ofbid = "d60860e50__20250409171035" > 如图所示， < / p >
< ul class = "- topic/ul ul" id = "rtp_working_logic__ul_fwc_lry_21c" data-ofbid = "rtp_working_logic__ul_fwc_lry_21c" >
< li class = "- topic/li li" data-ofbid = "d60860e55__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e57__20250409171035" > 表面硬图层：手指触摸的表面是一个硬涂层，用以保护下面的 PET 层。< / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d60860e61__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e63__20250409171035" > PET 层：很薄、有弹性，当表面被触摸时它会向下弯曲，并使得下面的两层 ITO 涂层能够相互接触并在该点连通电路。< / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d60860e67__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e69__20250409171035" > ITO 陶瓷层：两个 ITO 层之间是约千分之一英寸厚的一些隔离支点使两层分开。< / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d60860e73__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e75__20250409171035" > 玻璃底层：最下面是一个透明的硬底层用来支撑上面的结构，通常也可以用塑料。< / p >
< / li >
< / ul >
< p class = "- topic/p p" data-ofbid = "d60860e80__20250409171035" > RTP 多层结构会导致较大的光损失，手持设备通常需要加大背光源来弥补透光性不好的问题，从而增加电池的消耗。< / p >
< / section >
< section class = "- topic/section section" id = "rtp_working_logic__section_gwc_lry_21c" data-ofbid = "rtp_working_logic__section_gwc_lry_21c" > < h2 class = "- topic/title title sectiontitle" > 坐标计算< / h2 >
< div class = "- topic/p p" data-ofbid = "d60860e89__20250409171035" > ITO 陶瓷层分为上下两层，即 X 层和 Y 层，中间用隔离支点分开：< ul class = "- topic/ul ul" id = "rtp_working_logic__ul_iwc_lry_21c" data-ofbid = "rtp_working_logic__ul_iwc_lry_21c" >
< li class = "- topic/li li" data-ofbid = "d60860e93__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e95__20250409171035" > 当有触摸按下时，触摸点的 X 层和 Y 层会导通。< / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d60860e99__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e101__20250409171035" > 当没有触摸按下时， < / p >
< / li >
< / ul > < / div >
< p class = "- topic/p p" data-ofbid = "d60860e106__20250409171035" > X 层上 X- 到 X+ 和 Y- 到 Y+的电阻是均匀分布的，其电路等效图如下：< / p >
< figure class = "- topic/fig fig fignone" id = "rtp_working_logic__fig_n4b_yry_21c" data-ofbid = "rtp_working_logic__fig_n4b_yry_21c" >
< br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "rtp_working_logic__image_jwc_lry_21c" src = "../../../images/rtp/xy_layer.png" alt = "xy_layer1" / > < / div > < br / >
< figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 2< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > RTP 的 X 层、Y 层等效电路< / span > < / figcaption > < / figure >
< ol class = "- topic/ol ol" id = "rtp_working_logic__ol_kwc_lry_21c" data-ofbid = "rtp_working_logic__ol_kwc_lry_21c" >
< li class = "- topic/li li" data-ofbid = "d60860e123__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e125__20250409171035" > < strong class = "+ topic/ph hi-d/b ph b" > 计算 X 坐标< / strong > ：在 X+ 电极施加驱动电压 V， ， < / p >
< figure class = "- topic/fig fig fignone" id = "rtp_working_logic__fig_qww_vry_21c" data-ofbid = "rtp_working_logic__fig_qww_vry_21c" >
< br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "rtp_working_logic__image_lwc_lry_21c" src = "../../../images/rtp/x_coordinate.png" alt = "x_coordinate1" / > < / div > < br / >
< figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 3< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > 计算 X 坐标的关系图< / span > < / figcaption > < / figure >
< div class = "- topic/p p" data-ofbid = "d60860e142__20250409171035" > 由于 ITO 层均匀导电，触点电压与 Vdrive 电压之比等于触点 X 坐标与屏宽度之比。< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "rtp_working_logic__pre_mwc_lry_21c" data-ofbid = "rtp_working_logic__pre_mwc_lry_21c" > x=(Vy/Vdrv)*width< / pre > < / div >
< / li >
< li class = "- topic/li li" data-ofbid = "d60860e148__20250409171035" > < strong class = "+ topic/ph hi-d/b ph b" > 计算 Y 坐标< / strong > ：在 Y+ 电极施加驱动电压 V， < figure class = "- topic/fig fig fignone" id = "rtp_working_logic__fig_m13_vry_21c" data-ofbid = "rtp_working_logic__fig_m13_vry_21c" >
< br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "rtp_working_logic__image_owc_lry_21c" src = "../../../images/rtp/y_coordinate.png" alt = "y_coordinate1" / > < / div > < br / >
< figcaption data-caption-side = "bottom" class = "- topic/title title figcapcenter" > < span class = "figtitleprefix fig--title-label" > 图< span class = "fig--title-label-number" > 4< / span > < span class = "fig--title-label-punctuation" > . < / span > < / span > < span class = "fig--title" > 计算 Y 坐标的关系图< / span > < / figcaption > < / figure > < div class = "- topic/p p" data-ofbid = "d60860e163__20250409171035" > 由于 ITO 层均匀导电，触点电压与 V 电压之比等于触点 Y
坐标与屏高度之比。< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "rtp_working_logic__pre_pwc_lry_21c" data-ofbid = "rtp_working_logic__pre_pwc_lry_21c" > y/height=Vx/Vdrvy=(Vx/Vdrv)*height< / pre > < / div > < / li >
< / ol >
< / section >
< section class = "- topic/section section" id = "rtp_working_logic__section_qwc_lry_21c" data-ofbid = "rtp_working_logic__section_qwc_lry_21c" > < h2 class = "- topic/title title sectiontitle" > 坐标采样< / h2 >
< p class = "- topic/p p" data-ofbid = "d60860e175__20250409171035" > 基于以上原理，对 X+、X-、Y+、Y- 加不同的电信号，拉低、还是拉高，会得到多种组合，
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常用的组合命名为： ， ： ，
是和压感有关的数据。< / p >
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< / section >
< section class = "- topic/section section" id = "rtp_working_logic__section_rwc_lry_21c" data-ofbid = "rtp_working_logic__section_rwc_lry_21c" > < h2 class = "- topic/title title sectiontitle" > 坐标校准< / h2 > < div class = "- topic/p p" data-ofbid = "d60860e182__20250409171035" > 触摸屏和 LCD 屏需要结合在一起使用：< ul class = "- topic/ul ul" id = "rtp_working_logic__ul_mv3_vfs_sdc" data-ofbid = "rtp_working_logic__ul_mv3_vfs_sdc" >
< li class = "- topic/li li" data-ofbid = "d60860e186__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e188__20250409171035" > LCD 屏中运行的 GUI 需要获得一个转换后的坐标， 且坐标值必须在 LCD 屏分辨率的范围内。< / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d60860e192__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e194__20250409171035" > 从触摸屏坐标转换到 LCD 坐标的过程，会执行一次线性转换，通用公式如下：< / p >
< div class = "- topic/p p" data-ofbid = "d60860e197__20250409171035" >
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< br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "rtp_working_logic__image_swc_lry_21c" src = "../../../images/rtp/coordinate_adjustment.png" alt = "coordinate_adjustment1" / > < / div > < br / >
< / div >
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< p class = "- topic/p p" data-ofbid = "d60860e206__20250409171035" > 在线性转换公式中， ， ，
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0~4095。校准过程如下： < / p >
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< div class = "- topic/p p" data-ofbid = "d60860e209__20250409171035" >
< ul class = "- topic/ul ul" id = "rtp_working_logic__ul_py2_cgs_sdc" data-ofbid = "rtp_working_logic__ul_py2_cgs_sdc" >
< li class = "- topic/li li" data-ofbid = "d60860e213__20250409171035" > 分别点击屏幕的四个角落，可测到 4 组 LCD 坐标值和触摸屏触摸屏坐标值。< / li >
< li class = "- topic/li li" data-ofbid = "d60860e216__20250409171035" > 列出 8 个等式， 求解出 a、b、c、d、e、f 的值。< p class = "- topic/p p" data-ofbid = "d60860e218__20250409171035" > 开源 tslib 库附带的 ts_calibrate
工具，提供了 5 点校准的处理。< / p > < / li >
< / ul >
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< / div >
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< / li >
< / ul > < / div > < / section >
< section class = "- topic/section section" id = "rtp_working_logic__section_uwc_lry_21c" data-ofbid = "rtp_working_logic__section_uwc_lry_21c" > < h2 class = "- topic/title title sectiontitle" > 压感计算< / h2 > < p class = "- topic/p p" data-ofbid = "d60860e228__20250409171035" > 当打开压感数据后，便于根据压力数据来过滤掉一些抖动的点。
尤其在触摸时抬起的瞬间会大概率产生压力很小的采样数据，这样的数据会存在较大误差，可以根据压力将其过滤掉。< / p > < p class = "- topic/p p" data-ofbid = "d60860e230__20250409171035" > 可以通过下列公式计算压力数据：< / p > < p class = "- topic/p p" data-ofbid = "d60860e232__20250409171035" > < strong class = "+ topic/ph hi-d/b ph b" > 公式 1： < / strong > < / p > < div class = "- topic/p p" data-ofbid = "d60860e235__20250409171035" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "rtp_working_logic__image_vwc_lry_21c" src = "../../../images/rtp/pressure_formula1.png" width = "192" alt = "pressure_formula" / > < / div > < br / > < / div > < p class = "- topic/p p" data-ofbid = "d60860e241__20250409171035" > < strong class = "+ topic/ph hi-d/b ph b" > 公式 2： < / strong > < / p > < div class = "- topic/p p" data-ofbid = "d60860e244__20250409171035" > < br / > < div class = "imagecenter" > < img class = "- topic/image image imagecenter" id = "rtp_working_logic__image_wwc_lry_21c" src = "../../../images/rtp/pressure_formula2.png" width = "384" alt = "pressure_formula21" / > < / div > < br / > < / div > < div class = "- topic/p p" data-ofbid = "d60860e250__20250409171035" > 两个公式的计算结果误差在 10% 以内。其中：< ul class = "- topic/ul ul" id = "rtp_working_logic__ul_zjv_vgs_sdc" data-ofbid = "rtp_working_logic__ul_zjv_vgs_sdc" >
< li class = "- topic/li li" data-ofbid = "d60860e254__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e256__20250409171035" > 公式 1 只需一个 plate 参数，公式 2 需要 x-plate 和 y-plate 参数。< / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d60860e260__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e262__20250409171035" > 公式 1 中的 Z1 和 Z2 对应坐标组合 ZA 和 ZB 的数据< / p >
< / li >
< li class = "- topic/li li" data-ofbid = "d60860e266__20250409171035" >
< p class = "- topic/p p" data-ofbid = "d60860e268__20250409171035" > 根据屏幕实测的电阻值，配置 DTS 中的 x-plate 和 y-plate 参数。< / p >
< / li >
< / ul > < / div > < / section >
< / div >
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< div class = " wh_topic_toc " > < div class = "wh_topic_label" > 在本页上< / div > < ul > < li class = "section-item" > < div class = "section-title" > < a href = "#rtp_working_logic__section_dwc_lry_21c" data-tocid = "rtp_working_logic__section_dwc_lry_21c" > 硬件结构原理< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#rtp_working_logic__section_gwc_lry_21c" data-tocid = "rtp_working_logic__section_gwc_lry_21c" > 坐标计算< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#rtp_working_logic__section_qwc_lry_21c" data-tocid = "rtp_working_logic__section_qwc_lry_21c" > 坐标采样< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#rtp_working_logic__section_rwc_lry_21c" data-tocid = "rtp_working_logic__section_rwc_lry_21c" > 坐标校准< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#rtp_working_logic__section_uwc_lry_21c" data-tocid = "rtp_working_logic__section_uwc_lry_21c" > 压感计算< / a > < / div > < / li > < / ul > < / div >
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