WO2016202159A1 - 触摸显示面板及显示装置 - Google Patents

触摸显示面板及显示装置 Download PDF

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Publication number
WO2016202159A1
WO2016202159A1 PCT/CN2016/083631 CN2016083631W WO2016202159A1 WO 2016202159 A1 WO2016202159 A1 WO 2016202159A1 CN 2016083631 W CN2016083631 W CN 2016083631W WO 2016202159 A1 WO2016202159 A1 WO 2016202159A1
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WO
WIPO (PCT)
Prior art keywords
display panel
liquid crystal
crystal layer
light
touch display
Prior art date
Application number
PCT/CN2016/083631
Other languages
English (en)
French (fr)
Inventor
李烘周
金然柱
郑奉官
高浩然
Original Assignee
京东方科技集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/514,691 priority Critical patent/US10379676B2/en
Publication of WO2016202159A1 publication Critical patent/WO2016202159A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing
    • 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
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133302—Rigid substrates, e.g. inorganic substrates
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/58—Arrangements comprising a monitoring photodetector
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix

Definitions

  • the present disclosure relates to the field of touch display technology, and in particular to a touch display panel and a display device capable of reducing a touch detection error rate.
  • LCD Liquid Crystal Display
  • touch screen From the technical principle to distinguish the touch screen, it can be divided into the following basic categories: pressure sensing technology touch screen, resistance technology touch screen, capacitive technology touch screen, surface acoustic wave technology touch screen and touch screen based on light detection.
  • a light detection based touch screen includes a plurality of light sensors that are capable of detecting ambient light. When a user touches a certain touch area, the light sensor corresponding to the touch area changes due to the detection of the amount of light.
  • the processor can determine the implementation position of the touch operation according to the change of the detection result of the light sensor by the light sensor, and output the positioning result.
  • the photodetection touch screen in the related art has a problem that the detection result is inaccurate.
  • the light sensor can detect very little light before the finger touches, and when the finger touches, even if the finger can block all ambient light, the external ambient light itself is weak, so the finger
  • the change of the light sensor's detection result of the light amount is not obvious, which may lead to false detection, that is, the user performs the touch operation, but the device cannot detect it.
  • the frequency of the brightness change of the ambient light is very high, even if the user does not perform the touch operation, the light sensor The adjacent two test results may also have a large change, and the device will mistake the user for the touch operation.
  • the present disclosure provides a touch display panel and a display device, which can reduce the error rate of detecting a touch operation.
  • Some embodiments of the present disclosure provide a touch display panel, including a color film substrate, an array substrate, a backlight disposed under the array substrate, and a liquid crystal layer disposed between the color film substrate and the array substrate, the color film
  • the substrate includes a black matrix
  • the touch display panel further includes:
  • a light sensor having a light detecting surface facing the liquid crystal layer and for detecting light emitted by the backlight and passing through the liquid crystal layer and projected onto a light detecting surface of the light sensor, for obtaining The detection data of the touch operation position of the touch display panel.
  • the light sensor is disposed between the color film substrate and the liquid crystal layer.
  • the color filter substrate comprises a glass substrate
  • the black matrix is located on a side of the glass substrate away from a light emitting surface of the color filter substrate
  • the light sensor is located at the black matrix away from
  • an orthographic projection of the light detecting surface of the photosensor on the glass substrate is located in a region where the orthographic projection of the black matrix on the glass substrate is located.
  • a flat layer is disposed between the sensor and the liquid crystal layer.
  • the senor is disposed between the array substrate and the liquid crystal layer, and the black matrix is used for reflecting the light emitted by the backlight and passing through the liquid crystal layer.
  • the light of the reflecting surface of the black matrix is such that the reflected light passes through the liquid crystal layer and is incident on the light detecting surface of the photosensor.
  • the senor is disposed between the array substrate and the liquid crystal layer, and the touch display panel further includes:
  • a reflective layer disposed on a side of the color filter substrate adjacent to the liquid crystal layer for reflection
  • the light emitted by the backlight passing through the liquid crystal layer and incident on the reflective surface of the reflective layer causes at least partially reflected light to pass through the liquid crystal layer and then hit the light detecting surface of the photosensor.
  • the photosensor and the thin film transistor on the array substrate are simultaneously fabricated.
  • the reflective layer is located on a side of the black matrix away from the light exit surface of the color filter substrate, and the orthographic projection of the light detecting surface of the photosensor on the array substrate is located in the black
  • An orthographic projection of the reflective layer on the array substrate is located in a region where the orthographic projection of the black matrix on the array substrate is located in a region where the orthographic projection on the array substrate is located.
  • a flat layer is disposed between the reflective layer and the liquid crystal layer.
  • the time when the touch display panel displays one frame is divided into a display time period and a touch time period, and the touch display panel displays a fixed picture during the touch time period.
  • the backlight maintains a constant luminance of illumination during the touch period.
  • Some embodiments of the present disclosure also provide a display device including the touch display panel described above.
  • the light passing through the liquid crystal layer emitted by the backlight is detected by the light sensor, and the position of the touch operation operation is determined according to the detection result.
  • the light used in the embodiment of the present disclosure is the light emitted by the controllable backlight, so that the detection error that may occur when the touch operation is detected by the uncontrollable ambient light of the related art can be avoided, and the accuracy of the touch operation detection is improved. .
  • FIG. 1 is a schematic structural diagram of a touch display panel according to some embodiments of the present disclosure
  • FIG. 2 is a schematic structural diagram of a touch display panel according to some embodiments of the present disclosure.
  • FIG. 3 illustrates a structural schematic diagram of a touch display panel of some embodiments of the present disclosure.
  • the light sensor is used to detect the backlight
  • the light emitted by the source passing through the liquid crystal layer is determined according to the detection result.
  • the light used in the embodiment of the present disclosure is the light emitted by the controllable backlight, so that the detection error that may occur when the touch operation is detected by the uncontrollable ambient light of the related art can be avoided, and the detection of the touch operation is improved. rate.
  • a touch display panel provided by some embodiments of the present disclosure includes a color filter substrate 101 , an array substrate 102 , a backlight 106 disposed under the array substrate 102 , and a color filter substrate 101 and The liquid crystal layer 103 between the array substrates 102.
  • the color filter substrate 101 includes a black matrix 104.
  • the touch display panel further includes a light sensor 105 for detecting light emitted by the backlight 106 and passing through the liquid crystal layer 103 to the light detecting surface of the light sensor 105, thereby obtaining a function for determining the touch. Control data of the touch operation position of the display panel.
  • the transmittance of the liquid crystal layer 103 between the first portion and the second portion is changed, so that the light source 105 corresponding to the first portion and the second portion can be detected by the backlight.
  • the amount of light emitted will be less.
  • the processor can determine the corresponding touch area according to the position of the light sensor whose light quantity detection result changes, and realize the determination of the touch operation position.
  • the touch display panel of the embodiment of the present disclosure is capable of determining the touch operation position based on the light emitted by the backlight.
  • the touch display panel based on the light emitted by the backlight to determine the touch operation position has the following effective effects.
  • the light sensor is detected according to the light emitted by the backlight.
  • the backlight can be controlled to meet the positioning requirement during the touch operation detection phase. .
  • Control of the backlight consists of two parts:
  • Control of brightness that is, control the brightness of the backlight in the touch operation detection stage to satisfy the light
  • the minimum detection requirement of the sensor enables the light sensor to detect enough light for positioning for a certain period of time, thereby avoiding the undetectable condition caused by the weak ambient light in the related art.
  • Stability control that is, the backlight maintains a relatively stable illumination brightness during the touch operation detection phase.
  • the change of the light detected by the light sensor is caused by the change of the transmittance of the liquid crystal, and the possibility due to the change of the light source itself is eliminated, thereby avoiding the high brightness of the ambient light itself in the related art. False detection caused by frequency changes.
  • the touch display panel of the embodiment of the present disclosure avoids the detection error and the undetectable problem when the touch operation is detected by using the uncontrollable ambient light of the related art, and improves the touch operation detection.
  • the accuracy rate it can be found that the touch display panel of the embodiment of the present disclosure avoids the detection error and the undetectable problem when the touch operation is detected by using the uncontrollable ambient light of the related art, and improves the touch operation detection. The accuracy rate.
  • the light sensor 105 in the specific embodiment of the present disclosure is emitted by the backlight as compared with the related art light sensor, rather than the ambient light of the related art.
  • the light detected by the light sensor 105 in the specific embodiment of the present disclosure is the light that passes through the liquid crystal layer through the backlight, so the detection result can reflect the thickness variation of the liquid crystal layer caused by the touch operation, thereby determining the touch. The location of the operation.
  • the photosensor of the embodiment of the present disclosure may be disposed at a plurality of locations, which are respectively described below.
  • the photosensor described above is disposed between the color filter substrate and the liquid crystal layer.
  • the photosensor 105 is disposed on the color filter substrate 101 , and the light emitted by the backlight 106 can reach the photosensor 105 after passing through the array substrate 102 and the liquid crystal layer 103 .
  • the distance between the portion of the color filter substrate located in the first region and the portion of the array substrate located in the first region may be greatly changed.
  • This change affects the transmittance of the liquid crystal layer 103 in the first region such that the light emitted by the backlight through the liquid crystal layer of the first region changes, and after such change is detected by the photosensor 105,
  • the touch operation position can be located according to the position of the photosensor where the change is detected.
  • the light sensor 105 in the other regions does not detect the above change.
  • the light detecting surface of the photosensor described above faces the liquid crystal layer. Therefore, the ambient light passes through the color film layer and cannot be projected onto the light detecting surface, so that erroneous detection is not caused due to changes in ambient light.
  • the photosensor may be disposed at any position of the color filter substrate located in the display area. Further, in order to ensure the aperture ratio of the display panel, the light sensor may be disposed under the black matrix to avoid the influence on the display.
  • the color filter substrate includes a glass substrate, the black matrix is located on a side of the glass substrate away from the light emitting surface of the color filter substrate, and the light sensor is located at a side of the black matrix away from the glass substrate, An orthographic projection of the light detecting surface of the photosensor on the glass substrate is located in a region where the orthographic projection of the black matrix on the glass substrate is located.
  • the light sensor is disposed under the black matrix, which not only can block the ambient light by using the black matrix, but also avoid the influence of the ambient light on the light sensor, and does not reduce the aperture ratio of the display panel.
  • a flat layer is disposed between the photosensor and the liquid crystal layer.
  • the liquid crystal does not erode the light sensor, effectively protecting the light sensor.
  • the use of a flat layer effectively ensures the consistency of the thickness of the liquid crystal cell.
  • a photosensor may also be disposed between the array substrate and the liquid crystal layer.
  • the light sensor 105 is disposed on the array substrate 102, and the light emitted by the backlight 106 can reach the color filter substrate 101 after passing through the array substrate 102 and the liquid crystal layer 103. Under the reflection of the black matrix 104, the liquid crystal layer 103 is re-entered and reaches the photosensor 105 after passing through the liquid crystal layer 103 again.
  • the distance between the color filter substrate and the array substrate changes greatly in the pressing region.
  • Such a change affects the transmittance of the liquid crystal layer 103 in the pressed region, so that the light passing through the liquid crystal layer of the pressing region is changed twice before and after the pressing by the backlight, and this After the change is detected by the light sensor 105, the touch operation can be located according to the position of the light sensor 105 where the change is detected.
  • the light sensor 105 in the other regions does not detect the above change.
  • the black matrix directly utilizes certain reflection characteristics, but when the reflectivity of the black matrix is small, it can be solved in various ways, such as improving the luminance of the backlight during the detection phase of the touch operation, but This way obviously leads to an increase in power consumption.
  • the touch display panel further includes:
  • a reflective layer 107 disposed on a side of the color filter substrate closer to the liquid crystal layer for reflecting light emitted by the backlight 106 and passing through the liquid crystal layer 103 and incident on the reflective surface of the reflective layer 107. At least a portion of the reflected light is allowed to pass through the liquid crystal layer 103 and then strike the light detecting surface of the photosensor.
  • the light sensor 105 can receive enough light to perform touch operation detection without increasing power consumption.
  • the reflective layer is located at a distance of the black matrix away from the light emitting surface of the color filter substrate.
  • an orthographic projection of the light detecting surface of the photosensor on the array substrate is located in a region where the orthographic projection of the black matrix on the array substrate is located, and the reflective layer is positive on the array substrate The projection is located in an area where the orthographic projection of the black matrix on the array substrate is located.
  • the light sensor is disposed directly under the black matrix, which not only can use the black matrix to block the ambient light, but also avoid the influence of the ambient light on the light sensor, and does not reduce the aperture ratio of the display panel.
  • the photosensor and the thin film transistor on the array substrate are simultaneously fabricated in order to reduce the process flow.
  • the thickness of the liquid crystal layer may be inconsistent. Therefore, in order to solve the above problem, in the touch display panel of some embodiments of the present disclosure, between the reflective layer and the liquid crystal layer Set with a flat layer.
  • the flat layer is set to ensure the consistency of the thickness of the liquid crystal cell and improve the performance of the touch display panel. can.
  • position detection is implemented according to a change in transmittance of the liquid crystal layer.
  • the touch display panel of the embodiment of the present disclosure there are two situations that cause a change in the transmittance of the liquid crystal layer.
  • One is that the display screen changes during the display process, and the pixel gray scale needs to be changed.
  • the transmittance of the layer also changes to meet the changing needs of grayscale.
  • the other is a change in the thickness of the liquid crystal layer caused by the touch operation, which also changes the transmittance of the liquid crystal layer.
  • the change in the transmittance of the liquid crystal layer includes the above two situations, that is, the change in the transmittance due to the change of the display screen and the change in the transmittance due to the touch operation. Therefore, in the embodiment of the present disclosure, the touch display is required.
  • the panel displays the time of each frame (V-sync) divided into display time period (Display) and touch time period (Touch).
  • a fixed picture is displayed during the touch time period, so that the transmittance change of the liquid crystal layer in the touch time period is uniquely derived from the touch operation, and the accuracy of the touch operation detection is ensured.
  • the time of displaying the touch screen for one frame may be selected as the touch time period, and the other 11.7 ms is used as the display time period.
  • the processing capability of the integrated circuit chip may be appropriately adjusted according to the processing capability of the integrated circuit chip.
  • the length of time is not specifically limited here.
  • the time when the touch display panel displays one frame is divided into a display time period and a touch time period.
  • the touch display panel displays a fixed picture, and within the touch time period, The backlight maintains a constant luminance of illumination.
  • the present disclosure also discloses a display device including the above touch display panel.
  • the display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • a display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • a display device reference may be made to the embodiment of the above touch display panel, and the repeated description is omitted.

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Abstract

一种触摸显示面板及显示装置。该触摸显示面板包括彩膜基板(101)、阵列基板(102)、设置于阵列基板(102)下方的背光源(106)和设置于彩膜基板(101)和阵列基板(102)之间的液晶层(103)，所述彩膜基板(101)包括黑矩阵(104)。所述触摸显示面板还包括：光传感器(105)，设置于彩膜基板(101)与液晶层(103)之间或阵列基板(102)与液晶层(103)之间，用于检测由背光源(106)发出的经过所述液晶层(103)后射到所述光传感器(105)的光线检测面的光线，得到用于确定作用于触控显示面板的触控操作位置的检测数据。

Description

触摸显示面板及显示装置
相关申请的交叉引用
本申请主张在2015年6月16日在中国提交的中国专利申请号No.201510333864.X的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及触摸显示技术领域，特别是一种能够降低触摸检测错误率的触摸显示面板及显示装置。
背景技术
近来，液晶显示器(Liquid Crystal Display，LCD)技术有了飞速的发展，从屏幕的尺寸到显示的质量都取得了极大的进步。LCD具有体积小、功耗低、无辐射等特点，现已占据了平面显示领域的主导地位。而触摸屏是将输入、输出一体化的重要载体之一，触控屏已经成为各种便携式电子设备的标准配置。
从技术原理来区别触摸屏，可分为如下几个基本种类：压力传感技术触摸屏、电阻技术触摸屏、电容技术触摸屏、表面声波技术触摸屏以及基于光检测的触摸屏。
基于光检测的触摸屏包括多个光传感器，其能够检测环境光。当用户手指对某一个触控区域进行触控操作时，由于手指的遮挡，会导致该触控区域对应的光传感器针对光量的检测结果发生变化。而处理器即可根据上述光传感器对光线量的检测结果的变化来确定触控操作的实施位置，输出定位结果。
相关技术中的光检测触摸屏存在着检测结果不准确的问题。当外界环境光比较弱时，在手指触摸之前，光传感器能够检测到的光线就非常少，而当手指触摸时，即使手指能够遮挡所有的环境光线，但由于外界环境光本身比较弱，因此手指触摸之前和手指触摸时，光传感器对光线量的检测结果之间的变化并不明显，会导致误检测，即：用户进行了触控操作，但设备无法检测到。当外界环境光的亮度变化的频率非常高时，即使用户没有进行触控操作，光传感器 相邻的两次检测结果也有可能出现较大的变化，此时设备就会误以为用户进行了触控操作。
发明内容
本公开提供了一种触摸显示面板及显示装置，可以降低检测触控操作的错误率。
本公开一些实施例提供了一种触摸显示面板，包括彩膜基板、阵列基板、设置于阵列基板下方的背光源和设置于所述彩膜基板和阵列基板之间的液晶层，所述彩膜基板包括黑矩阵，所述触摸显示面板还包括：
光传感器，所述光传感器具有面向所述液晶层的光线检测面并用于检测由所述背光源发出的经过所述液晶层后投射到所述光传感器的光线检测面的光线，得到用于确定作用于触控显示面板的触控操作位置的检测数据。
上述的触摸显示面板，可选的，所述光传感器设置于所述彩膜基板与所述液晶层之间。
上述的触摸显示面板，可选的，所述彩膜基板包括玻璃基板，所述黑矩阵位于所述玻璃基板远离所述彩膜基板出光面的一侧，所述光传感器位于所述黑矩阵远离玻璃基板的一侧，所述光传感器的光线检测面在所述玻璃基板上的正投影位于所述黑矩阵在所述玻璃基板上的正投影所在的区域内。
上述的触摸显示面板，可选的，所述传感器与所述液晶层之间设置有平坦层。
上述的触摸显示面板，可选的，所述传感器设置于所述阵列基板与所述液晶层之间，所述黑矩阵用于反射由所述背光源发出的经过所述液晶层后射到所述黑矩阵的反射面的光线，使得反射光穿过所述液晶层后射到所述光传感器的光线检测面。
上述的触摸显示面板，可选的，所述传感器设置于所述阵列基板与所述液晶层之间，所述触摸显示面板还包括：
反射层，所述反射层设置于彩膜基板的靠近所述液晶层的一侧，用于反射 由所述背光源发出的经过所述液晶层后射到所述反射层的反射面的光线，使得至少部分反射光穿过所述液晶层后射到所述光传感器的光线检测面。
上述的触摸显示面板，可选的，所述光传感器和所述阵列基板上的薄膜晶体管同时制作。
上述的触摸显示面板，其中，所述反射层位于所述黑矩阵远离所述彩膜基板出光面的一侧，所述光传感器的光线检测面在所述阵列基板上的正投影位于所述黑矩阵在所述阵列基板上的正投影所在的区域内，所述反射层在所述阵列基板上的正投影位于所述黑矩阵在所述阵列基板上的正投影所在的区域内。
上述的触摸显示面板，可选的，所述反射层与所述液晶层之间设置有平坦层。
上述的触摸显示面板，可选的，所述触摸显示面板显示一帧的时间分为显示时间段和触控时间段，在触控时间段内，所述触摸显示面板显示固定不变的画面，在触控时间段内，所述背光源维持恒定的发光亮度。
本公开一些实施例还提供了一种显示装置，包括上述的触摸显示面板。
本公开实施例的触摸显示面板及显示装置中，利用光传感器来检测由背光源发出的经过液晶层的光线，并根据该检测结果来进行触控操作位置的确定。本公开实施例利用的光线是可控的背光源发出的光线，因此能够避免相关技术的利用不可控的环境光进行触控操作检测时可能产生的检测错误，提高了触控操作检测的准确率。
附图说明
图1示出了本公开一些实施例的触摸显示面板的结构示意图；
图2示出了本公开一些实施例的触摸显示面板的结构示意图；
图3示出了本公开一些实施例的触摸显示面板的结构示意图。
具体实施方式
本公开实施例的触摸显示面板及显示装置中，利用光传感器来检测由背光 源发出的经过液晶层的光线，并根据该检测结果来进行触控位置确定。本公开实施例利用的光线是可控的背光源发出的光线，因此能够避免相关技术的利用不可控的环境光进行触控操作检测时所可能产生的检测错误，提高了触控操作检测的准确率。
如图1和图2所示，本公开一些实施例提供的触摸显示面板，包括彩膜基板101、阵列基板102、设置于阵列基板102下方的背光源106和设置于所述彩膜基板101和阵列基板102之间的液晶层103。所述彩膜基板101包括黑矩阵104。所述触摸显示面板还包括光传感器105，用于检测由所述背光源106发出的经过所述液晶层103后射到所述光传感器105的光线检测面的光线，得到用于确定作用于触控显示面板的触控操作位置的检测数据。
本公开实施例中，如图1和图2所示，当用户通过指点物按压触控区域时，会有压力作用于彩膜基板101，而在上述的压力作用下，彩膜基板101的位于触控区域的第一部分与阵列基板102的位于触控区域的第二部分之间的距离会变小。
而当上述的距离变小时，则会改变第一部分与第二部分之间的液晶层103的透过率，进而使得与第一部分和第二部分对应设置的光传感器105能够检测到的由背光源发出的光线会变少。
当光量检测结果发生变化时，处理器即可依据光量检测结果发生变化的光传感器所处的位置确定对应的触控区域，实现触控操作位置的确定。依据上述的说明可以发现，本公开实施例的触摸显示面板是能够基于背光源所发出的光线确定触控操作位置的。而同时，上述的基于背光源所发出的光线确定触控操作位置的触摸显示面板还具有如下的有效效果。
在本公开的具体实施例中，光传感器是依据背光源发出的光线来进行检测，相对于不可控的环境光线而言，在触控操作检测阶段，可以控制背光源的发光，以满足定位需求。
对背光源的控制包括两个部分：
1、亮度的控制，即在触控操作检测阶段控制背光源的发光亮度，满足光 传感器的最低检测要求，使得光传感器在某一段时间内能够检测到足够的光线以进行定位，避免了相关技术中由于环境光较弱而导致的无法检测的情况。
2、稳定性的控制，即在触控操作检测阶段使背光源维持较稳定的发光亮度。这种情况下，光传感器所检测到的光线的变化是由于液晶透过率变化而导致的，排除了由于光源自身的变化而导致的可能性，因此避免了相关技术中由于环境光自身亮度高频率变化而导致的误检测。
综上所述，可以发现，本公开实施例的触摸显示面板避免了相关技术的利用不可控的环境光进行触控操作检测时所存在的检测出错以及无法检测的问题，提高了触控操作检测的准确率。
在本公开的具体实施例中的光传感器105和相关技术的光传感器相比，其检测到的光线是由背光源发出的，而不是相关技术的环境光线。同时，本公开的具体实施例中的光传感器105检测到的光线是通过背光源发出的通过液晶层的光线，因此检测结果能够反映由于触控操作导致的液晶层的厚度变化，进而确定触控操作的位置。
基于以上的需求，本公开实施例的光传感器可以设置于多个位置，分别说明如下。
在本公开一些实施例中，上述的光传感器设置于所述彩膜基板与所述液晶层之间。
如图1所示，上述的光传感器105设置于彩膜基板101上，则背光源106所发出的光线能够在穿过阵列基板102以及液晶层103之后到达光传感器105。
如图1所示，当用户手指按压彩膜基板时，则彩膜基板位于第一区域内的部分和阵列基板位于第一区域内的部分之间的距离会发生较大的改变。这种改变会影响第一区域内的液晶层103的透过率，使得由背光源发出的穿过第一区域的液晶层的光线发生改变，而这种改变被光传感器105检测到之后，即可根据检测到这种变化的光传感器所在的位置定位触控操作位置。
而在其他区域，由于彩膜基板和阵列基板之间的距离并没有改变，因此其他区域的光传感器105不会检测到上述的变化。
在本公开具体实施例中，上述的光传感器的光检测面朝向液晶层，因此，外界环境光穿过彩膜层之后无法投射到光检测面，因此不会由于环境光的变化导致误检测。
本公开具体实施例中，上述的光传感器可以设置于彩膜基板的位于显示区内的任意位置。进一步地，为了保证显示面板的开口率，光传感器可设置于黑矩阵下方，以避免对显示的影响。
即：所述彩膜基板包括玻璃基板，所述黑矩阵位于所述玻璃基板远离所述彩膜基板出光面的一侧，所述光传感器位于所述黑矩阵远离玻璃基板的一侧，所述光传感器的光线检测面在所述玻璃基板上的正投影位于所述黑矩阵在所述玻璃基板上的正投影所在的区域内。
光传感器设置于黑矩阵的下方，不但可以利用黑矩阵来遮挡环境光，避免环境光对光传感器的影响，还不会降低显示面板的开口率。
在本公开具体实施例中，如图1所示，如果上述的光传感器直接与液晶层接触，可能会造成液晶层的盒厚不一致以及液晶影响光传感器工作的情形，因此，为了解决上述问题，本公开实施例的触摸显示面板中，所述光传感器与所述液晶层之间设置有平坦层。
设置平坦层之后，首先，液晶不会对光传感器造成侵蚀，有效的保护了光传感器。同时，利用平坦层有效的保证了液晶盒厚的一致性。
在本公开一些实施例中，光传感器也可以设置于所述阵列基板与所述液晶层之间。
如图2所示，上述的光传感器105设置于阵列基板102上，则背光源106所发出的光线能够在穿过阵列基板102以及液晶层103之后到达彩膜基板101，在彩膜基板101的黑矩阵104的反射作用下，会重新进入液晶层103，并在再一次穿过液晶层103之后到达光传感器105。
当用户手指按压彩膜基板时，则在按压区域内彩膜基板和阵列基板间的距离会发生较大的改变。这种改变会影响按压区域内的液晶层103的透过率，使得由背光源发出的按压前后两次穿过按压区域的液晶层的光线发生改变，而这 种改变被光传感器105检测到之后，即可根据检测到这种变化的光传感器105所在的位置定位触控操作。
而在其他区域，由于彩膜基板和阵列基板之间的距离并没有改变，因此其他区域的光传感器105不会检测到上述的变化。
在上述方式中，直接利用了黑矩阵具有一定的反射特性，但当黑矩阵的反射率较小时，可以通过各种方式来解决，如提高背光源在触控操作检测阶段的发光亮度，但这种方式很明显会带来功耗的增加。
因此，在本公开的一些实施例中，如图3所示，所述触摸显示面板还包括：
设置于彩膜基板的距离所述液晶层更近的一侧的反射层107，用于反射由背光源106发出的经过所述液晶层103后射到所述反射层107的反射面的光线，使得至少部分反射光能够穿过所述液晶层103后射到所述光传感器的光线检测面。
这种方式下，在不增加功耗的情况下保证了光传感器105能够接收到足够光以进行触控操作检测。
为了降低环境光对光传感器的检测结果的影响，同时为了提高显示面板的开口率，在本公开的一些实施例中，所述反射层位于所述黑矩阵远离所述彩膜基板出光面的一侧，所述光传感器的光线检测面在所述阵列基板上的正投影位于所述黑矩阵在所述阵列基板上的正投影所在的区域内，所述反射层在所述阵列基板上的正投影位于所述黑矩阵在所述阵列基板上的正投影所在的区域内。
光传感器设置于黑矩阵的正下方，不但可以利用黑矩阵来遮挡环境光，避免环境光对光传感器的影响，还不会降低显示面板的开口率。
在本公开的具体实施例中，当光传感器设置阵列基板与液晶层之间时，为了减少工艺流程，所述光传感器和所述阵列基板上的薄膜晶体管同时制作。
如果反射层直接与液晶层接触，可能会造成液晶层的盒厚不一致的情形，因此，为了解决上述问题，本公开一些实施例的触摸显示面板中，所述反射层与所述液晶层之间设置有平坦层。
设置的平坦层有效的保证了液晶盒厚的一致性，提高了触摸显示面板的性 能。
本公开实施例的触摸显示面板中，是依据液晶层透过率的变化来实现位置检测。而对于本公开实施例的触摸显示面板而言，有两种情形会导致液晶层的透过率变化，一种是显示过程中显示画面的变化而导致像素灰度需要改变，此时对应的液晶层的透过率也会发生变化，以满足灰度的变化需求。
另一种是触控操作导致的液晶层厚度的变化，也会改变液晶层透过率。
由于液晶层透过率变化包括如上两种情形，即由显示画面变化带来的透过率变化以及由于触控操作带来的透过率变化，因此，本公开实施例中，需要将触摸显示面板显示每一帧(V-sync)的时间分成显示时间段(Display)和触控时间段(Touch)。
在触控时间段显示固定不变的画面，使得触控时间段内的液晶层透过率变化唯一来自于触控操作，保证触控操作检测的准确度。
例如可以将触摸屏的显示一帧的时间(如16.7ms)，选取其中5ms作为触控时间段，其他的11.7ms作为显示时间段，当然也可以根据集成电路芯片的处理能力适当的调整两者的时长，在此不做具体限定。
同时，应当理解的是，在本公开一些实施例中，在触控时间段，需要控制背光源以恒定亮度的方式发光。
即：上述的触摸显示面板显示一帧的时间分为显示时间段和触控时间段，在触控时间段内，所述触摸显示面板显示固定不变的画面，在触控时间段内，所述背光源维持恒定的发光亮度。
本公开还公开了一种显示装置，包括上述的触摸显示面板。
该显示装置可以为：手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。该显示装置的实施可以参见上述触摸显示面板的实施例，重复之处不再赘述。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (11)

  1. 一种触摸显示面板，包括彩膜基板、阵列基板、设置于阵列基板下方的背光源和设置于所述彩膜基板和阵列基板之间的液晶层，所述彩膜基板包括黑矩阵，其中，所述触摸显示面板还包括：
    光传感器，所述光传感器具有面向所述液晶层的光线检测面并用于检测由所述背光源发出的经过所述液晶层后射到所述光传感器的光线检测面的光线，得到用于确定作用于触控显示面板的触控操作位置的检测数据。
  2. 根据权利要求1所述的触摸显示面板，其中，所述光传感器设置于所述彩膜基板与所述液晶层之间。
  3. 根据权利要求2所述的触摸显示面板，其中，所述彩膜基板包括玻璃基板，所述黑矩阵位于所述玻璃基板远离所述彩膜基板出光面的一侧，所述光传感器位于所述黑矩阵远离玻璃基板的一侧，所述光传感器的光线检测面在所述玻璃基板上的正投影位于所述黑矩阵在所述玻璃基板上的正投影所在的区域内。
  4. 根据权利要求2所述的触摸显示面板，其中，所述光传感器与所述液晶层之间设置有平坦层。
  5. 根据权利要求1所述的触摸显示面板，其中，所述光传感器设置于所述阵列基板与所述液晶层之间，所述黑矩阵用于反射由所述背光源发出的经过所述液晶层后射到所述黑矩阵的反射面的光线，使得反射光穿过所述液晶层后射到所述光传感器的光线检测面。
  6. 根据权利要求1所述的触摸显示面板，其中，所述光传感器设置于所述阵列基板与所述液晶层之间，所述触摸显示面板还包括：
    反射层，所述反射层设置于彩膜基板的靠近所述液晶层的一侧，用于反射由所述背光源发出的经过所述液晶层后射到所述反射层的反射面的光线，使得至少部分反射光穿过所述液晶层后射到所述光传感器的光线检测面。
  7. 根据权利要求5或6所述的触摸显示面板，其中，所述光传感器和所 述阵列基板上的薄膜晶体管同时制作。
  8. 根据权利要求6所述的触摸显示面板，其中，所述反射层位于所述黑矩阵远离所述彩膜基板出光面的一侧，所述光传感器的光线检测面在所述阵列基板上的正投影位于所述黑矩阵在所述阵列基板上的正投影所在的区域内，所述反射层在所述阵列基板上的正投影位于所述黑矩阵在所述阵列基板上的正投影所在的区域内。
  9. 根据权利要求8所述的触摸显示面板，其中，所述反射层与所述液晶层之间设置有平坦层。
  10. 根据权利要求1-9中任意一项所述的触摸显示面板，其中，所述触摸显示面板显示一帧的时间分为显示时间段和触控时间段，在触控时间段内，所述触摸显示面板显示固定不变的画面，在触控时间段内，所述背光源维持恒定的发光亮度。
  11. 一种显示装置，包括权利要求1-10中任意一项所述的触摸显示面板。
PCT/CN2016/083631 2015-06-16 2016-05-27 触摸显示面板及显示装置 WO2016202159A1 (zh)

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