JP2009180989A - Liquid crystal display and method of driving the same - Google Patents

Liquid crystal display and method of driving the same Download PDF

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JP2009180989A
JP2009180989A JP2008020576A JP2008020576A JP2009180989A JP 2009180989 A JP2009180989 A JP 2009180989A JP 2008020576 A JP2008020576 A JP 2008020576A JP 2008020576 A JP2008020576 A JP 2008020576A JP 2009180989 A JP2009180989 A JP 2009180989A
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liquid crystal
timing
line signal
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Katsuyoshi Hiraki
克良 平木
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LG Display Co Ltd
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    • 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
    • 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
    • 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
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • 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
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • 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

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  • Human Computer Interaction (AREA)
  • Nonlinear Science (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
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  • Position Input By Displaying (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display incorporating an optical sensor and its drive method which can decrease the influence of noises made when writing on liquid crystals. <P>SOLUTION: The liquid crystal display incorporating an optical sensor and includes a line signal generator to generate line signals to specify the liquid crystal write timing for every horizontal line, and a timing controller 10 to read the line signals generated in the line signal generator to set up the timing once for every n (n is an integer of ≥1) horizontal lines to read the detected signals from the optical sensor without overlapping with the liquid crystal write timing, and to generate the compound line signals of a preset cycle specified at the timing that the liquid crystal write timing and the detected signal read timing are not overlapping each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、液晶表示装置に関し、特に、タッチパネル機能を持たせるための光学センサを備えた液晶表示装置に関する。   The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device provided with an optical sensor for providing a touch panel function.

タッチパネルは、一般的に、表示装置上に取り付けられ、手あるいはペンと接触するタッチ支点から電気的な特性が変わることによって、そのタッチ支点を感知するユーザーインタフェースの１つである。そして、その応用範囲は、小形携帯用端末機、事務用機器等にも広がっている。   A touch panel is generally a user interface that is mounted on a display device and senses a touch fulcrum by changing electrical characteristics from a touch fulcrum that contacts a hand or a pen. And the application range is extended to small portable terminals, office equipments and the like.

図６は、光学センサを内蔵した従来の液晶表示装置の回路図である。光学センサで受光する光の量に応じて、コンデンサＣｓの充電電圧が変化し、ゲート信号のタイミングにより、光学センサの検出結果を読み出せる構成となっている。従来の液晶表示装置においては、光学センサによる検出結果を取り出すタイミングを規定するゲート信号は、液晶表示パネルへのデータを書き込むタイミング（以下、液晶書き込みタイミングと称す）を規定するゲートラインの信号を共用している。   FIG. 6 is a circuit diagram of a conventional liquid crystal display device incorporating an optical sensor. The charging voltage of the capacitor Cs changes according to the amount of light received by the optical sensor, and the detection result of the optical sensor can be read out according to the timing of the gate signal. In the conventional liquid crystal display device, the gate signal that defines the timing for extracting the detection result by the optical sensor shares the gate line signal that defines the timing for writing data to the liquid crystal display panel (hereinafter referred to as the liquid crystal writing timing). is doing.

図７は、従来の液晶表示装置におけるゲート信号に対する液晶書き込みタイミングとセンサ読み出しタイミングの関係を示した説明図であり、水平方向の４ラインごとに１つの光学センサが設けられている場合を例示している。従来の液晶表示装置においては、液晶書き込みタイミングを規定するゲートラインを共用して、センサ読み出しタイミングを規定している。従って、４ラインごとに１回は、センサ読み出しと液晶書き込みとが同時に行われるタイミングが存在する。   FIG. 7 is an explanatory diagram showing the relationship between the liquid crystal writing timing and the sensor reading timing with respect to the gate signal in the conventional liquid crystal display device, and illustrates the case where one optical sensor is provided for every four horizontal lines. ing. In a conventional liquid crystal display device, a sensor read timing is defined by sharing a gate line that defines a liquid crystal writing timing. Accordingly, there is a timing at which sensor reading and liquid crystal writing are simultaneously performed once every four lines.

しかしながら、従来技術には次のような課題がある。
図８は、従来の液晶表示装置における表示画面とセンサ出力とを対比した図である。ゲートラインの信号を共用している関係で、センサ出力には、液晶に表示している画像データの影響が出ていることが分かる。すなわち、センサ読み出しと液晶書き込みとが同時に行われるタイミングが存在することに起因して、センサ出力に対して、液晶書き込みによるノイズの影響が出てしまっている。 However, the prior art has the following problems.
FIG. 8 is a diagram comparing a display screen and a sensor output in a conventional liquid crystal display device. It can be seen that the sensor output is affected by the image data displayed on the liquid crystal because the signal of the gate line is shared. That is, due to the presence of the timing at which sensor reading and liquid crystal writing are performed simultaneously, the influence of noise due to liquid crystal writing has appeared on the sensor output.

本発明は上述のような課題を解決するためになされたもので、光学センサを内蔵した液晶表示装置において、液晶書き込みによるノイズの影響を減少させることのできる液晶表示装置および液晶表示装置の駆動方法を得ることを目的とする。   The present invention has been made to solve the above-described problems, and in a liquid crystal display device incorporating an optical sensor, a liquid crystal display device capable of reducing the influence of noise caused by liquid crystal writing and a driving method of the liquid crystal display device The purpose is to obtain.

本発明に係る液晶表示装置は、光学センサを内蔵した液晶表示装置であって、水平ラインごとの液晶書き込みタイミングを規定するライン信号を生成するライン信号生成部と、ライン信号生成部で生成されたライン信号を読み込み、水平ラインｎ本（ただし、ｎは１以上の整数）ごとに１回、液晶書き込みタイミングと重複しないタイミングで光学センサからの検出信号読み出しタイミングを規定し、液晶書き込みタイミングおよび検出信号読み出しタイミングの両方を重複しないタイミングで規定した所定周期の複合ライン信号を生成するタイミングコントローラとを備えるものである。   A liquid crystal display device according to the present invention is a liquid crystal display device incorporating an optical sensor, and is generated by a line signal generation unit that generates a line signal that defines liquid crystal writing timing for each horizontal line, and a line signal generation unit. The line signal is read, and once every n horizontal lines (where n is an integer of 1 or more), the detection signal read timing from the optical sensor is defined at a timing that does not overlap with the liquid crystal write timing, and the liquid crystal write timing and detection signal are specified. And a timing controller that generates a composite line signal having a predetermined period that is defined by a timing that does not overlap both of the read timings.

また、本発明に係る液晶表示装置の駆動方法は、光学センサを内蔵した液晶表示装置の駆動方法であって、水平ラインごとの液晶書き込みタイミングを規定するライン信号を生成するステップと、生成されたライン信号を読み込み、水平ラインｎ本（ただし、ｎは１以上の整数）ごとに１回、液晶書き込みタイミングと重複しないタイミングで光学センサからの検出信号読み出しタイミングを規定し、液晶書き込みタイミングおよび検出信号読み出しタイミングの両方を重複しないタイミングで規定した所定周期の複合ライン信号を生成するステップとを備えるものである。   Further, the driving method of the liquid crystal display device according to the present invention is a driving method of the liquid crystal display device incorporating the optical sensor, and the step of generating a line signal that defines the liquid crystal writing timing for each horizontal line is generated. The line signal is read, and once every n horizontal lines (where n is an integer of 1 or more), the detection signal read timing from the optical sensor is defined at a timing that does not overlap with the liquid crystal write timing, and the liquid crystal write timing and detection signal are specified. And a step of generating a composite line signal having a predetermined period that is defined by a timing that does not overlap both of the read timings.

本発明によれば、センサ読み出し専用の水平周期を含む複合ライン信号を用いて光学センサの検出信号を読み出すことにより、光学センサを内蔵した液晶表示装置において、液晶書き込みによるノイズの影響を減少させることのできる液晶表示装置および液晶表示装置の駆動方法を得ることができる。   According to the present invention, by detecting a detection signal of an optical sensor using a composite line signal including a horizontal period dedicated to sensor reading, the influence of noise caused by liquid crystal writing can be reduced in a liquid crystal display device incorporating the optical sensor. Liquid crystal display device and a driving method of the liquid crystal display device can be obtained.

以下、本発明の液晶表示装置および液晶表示装置の駆動方法の好適な実施の形態につき図面を用いて説明する。   Hereinafter, preferred embodiments of a liquid crystal display device and a driving method of the liquid crystal display device of the present invention will be described with reference to the drawings.

実施の形態１．
図１は、本発明の実施の形態１の液晶表示装置におけるゲート信号に対する液晶書き込みタイミングとセンサ読み出しタイミングの関係を示した説明図であり、水平方向の４ラインごとに１つの光学センサが設けられている場合を例示している。より具体的には、上段が従来のタイミングを示したものであり。後段が本実施の形態１のタイミングを示したものである。 Embodiment 1 FIG.
FIG. 1 is an explanatory diagram showing the relationship between the liquid crystal writing timing and the sensor reading timing with respect to the gate signal in the liquid crystal display device of Embodiment 1 of the present invention, and one optical sensor is provided for every four horizontal lines. It illustrates the case. More specifically, the upper part shows the conventional timing. The subsequent stage shows the timing of the first embodiment.

本発明では、液晶書き込みによるノイズの影響を減少させるために、センサ読み出しと液晶書き込みとが同時に行われるタイミングが存在しないように、すなわち、センサ読み出し専用の水平周期を設けるようにしている。そして、本実施の形態１では、全水平ライン分の液晶書き込みに余裕がある場合において、センサ読み出し専用の水平周期を設ける具体的な解決策について説明する。   In the present invention, in order to reduce the influence of noise due to the liquid crystal writing, the horizontal period dedicated to sensor reading is provided so that there is no timing at which sensor reading and liquid crystal writing are performed simultaneously. In the first embodiment, a specific solution for providing a horizontal period dedicated to sensor reading when there is a margin in liquid crystal writing for all horizontal lines will be described.

ここで、全水平ライン分の液晶書き込みに余裕がある場合とは、全水平ライン分の液晶書き込みを行った後に、次画面分の液晶書き込みを開始するまでの間に、全画面分のセンサ読み出し専用の水平周期を追加する時間的な余裕があることを意味している。   Here, when there is a margin in liquid crystal writing for all horizontal lines, sensor reading for all screens is performed after the liquid crystal writing for all horizontal lines is started until the liquid crystal writing for the next screen is started. This means that there is time to add a dedicated horizontal period.

図２は、本発明の実施の形態１の液晶表示装置において、センサ読み出し専用の水平周期を新たに設けるための具体的な回路図である。ここでは、先の図１に対応して、水平方向の４ラインごとに１つの光学センサが設けられている場合における動作について説明する。   FIG. 2 is a specific circuit diagram for newly providing a horizontal period dedicated to sensor reading in the liquid crystal display device according to the first embodiment of the present invention. Here, the operation in the case where one optical sensor is provided for every four horizontal lines corresponding to FIG. 1 will be described.

タイミングコントローラ１０は、本来の液晶書き込み用の水平周期を有するライン信号に基づいて、液晶書き込みタイミングをｎ（ただし、ｎは、あらかじめ決められた１以上の整数であり、この説明においてはｎ＝４）周期発生させた後ごとに、センサ読み出しタイミングを１周期発生させるようにして、複合ライン信号（図１参照）を生成する。   The timing controller 10 sets the liquid crystal writing timing to n (where n is a predetermined integer of 1 or more based on the line signal having the original horizontal period for liquid crystal writing. In this description, n = 4. ) A composite line signal (see FIG. 1) is generated by generating one cycle of sensor readout timing every time after the generation.

特に、本実施の形態１のように、全水平ライン分の液晶書き込みに余裕がある場合には、最終的な複合ライン信号の水平周期は、ライン信号の本来の水平周期と同じにできる。従って、タイミングコントローラ１０は、ｎ＝４の場合を例に取ると、４水平周期に１回、センサ読み出し専用の水平周期を新たに挿入することにより、複合ライン信号を生成すればよい。   In particular, as in the first embodiment, when there is a margin in the liquid crystal writing for all horizontal lines, the horizontal cycle of the final composite line signal can be made the same as the original horizontal cycle of the line signal. Therefore, taking the case of n = 4 as an example, the timing controller 10 may generate a composite line signal by newly inserting a horizontal period dedicated to sensor reading once every four horizontal periods.

ラインメモリ２０は、液晶表示パネルに表示されるデータ信号を複数ライン分記憶するメモリである。そして、データ信号読み出し回路３０は、タイミングコントローラ１０で生成された複合ライン信号の各水平周期のうち、液晶書き込みに割り当てられたタイミング信号を受信し、そのタイミングでラインメモリ２０から所望のラインのデータ信号を取り出す。   The line memory 20 is a memory for storing a plurality of lines of data signals displayed on the liquid crystal display panel. The data signal readout circuit 30 receives the timing signal assigned to the liquid crystal writing in each horizontal period of the composite line signal generated by the timing controller 10, and at the timing, the data of the desired line is received from the line memory 20. Retrieve the signal.

一方、検出信号読み出し回路４０は、タイミングコントローラ１０で生成された複合ライン信号の各水平周期のうち、センサ読み出しに割り当てられた専用のタイミング信号を受信し、そのタイミングで光学センサ５０の検出結果を読み出す。このように、センサ読み出し専用の水平周期を有する複合ライン信号に基づいて、光学センサ５０の検出信号を取り出すことにより、液晶書き込みによるノイズの影響を減少させて検出信号を取り出すことが可能となる。   On the other hand, the detection signal reading circuit 40 receives a dedicated timing signal assigned to sensor reading out of each horizontal cycle of the composite line signal generated by the timing controller 10 and outputs the detection result of the optical sensor 50 at that timing. read out. In this way, by extracting the detection signal of the optical sensor 50 based on the composite line signal having a horizontal period dedicated to sensor reading, it is possible to reduce the influence of noise caused by liquid crystal writing and extract the detection signal.

図３は、本発明の実施の形態１における液晶表示装置のセンサ出力と従来の液晶表示装置のセンサ出力を比較した図である。図３（ａ）が従来の液晶表示装置のセンサ出力であり、図３（ｂ）が本実施の形態１における液晶表示装置のセンサ出力である。両者を比較することにより、センサ読み出し専用の水平周期を有する複合ライン信号に基づいて、光学センサ５０の検出信号を取り出すことにより、液晶書き込みによるノイズの影響が低減されていることが分かる。   FIG. 3 is a diagram comparing the sensor output of the liquid crystal display device according to Embodiment 1 of the present invention and the sensor output of a conventional liquid crystal display device. 3A shows the sensor output of the conventional liquid crystal display device, and FIG. 3B shows the sensor output of the liquid crystal display device according to the first embodiment. By comparing the two, it can be seen that the influence of noise due to the liquid crystal writing is reduced by taking out the detection signal of the optical sensor 50 based on the composite line signal having a horizontal period dedicated to sensor reading.

以上のように、実施の形態１によれば、タイミングコントローラの働きにより生成された、センサ読み出し専用の水平周期を含む複合ライン信号を用いて光学センサの検出信号を読み出すことにより、液晶書き込みによるノイズの影響を減少させることのできる液晶表示装置を実現できる。   As described above, according to the first embodiment, by detecting the detection signal of the optical sensor using the composite line signal including the horizontal period dedicated to sensor reading generated by the operation of the timing controller, noise due to liquid crystal writing is obtained. A liquid crystal display device that can reduce the influence of the above can be realized.

なお、図２の構成においては、タイミングコントローラ１０、ラインメモリ２０、データ信号読み出し回路３０、および検出信号読み出し回路４０を別々の構成として示したが、タイミングコントローラ１０の中に、ラインメモリ２０、データ信号読み出し回路３０、および検出信号読み出し回路４０を含める構成とすることも可能である。   In the configuration of FIG. 2, the timing controller 10, the line memory 20, the data signal readout circuit 30, and the detection signal readout circuit 40 are shown as separate configurations. However, in the timing controller 10, the line memory 20, data A configuration including the signal readout circuit 30 and the detection signal readout circuit 40 is also possible.

実施の形態２．
先の実施の形態１では、全水平ライン分の液晶書き込みに余裕がある場合において、センサ読み出し専用の水平周期を設ける具体的な解決策について説明した。これに対して、本実施の形態２では、全水平ライン分の液晶書き込みに余裕がない場合において、センサ読み出し専用の水平周期を設ける具体的な解決策について説明する。 Embodiment 2. FIG.
In the first embodiment, a specific solution for providing a horizontal period dedicated to sensor reading when there is a margin in liquid crystal writing for all horizontal lines has been described. On the other hand, in the second embodiment, a specific solution for providing a horizontal period dedicated to sensor reading when there is no allowance for liquid crystal writing for all horizontal lines will be described.

ここで、全水平ライン分の液晶書き込みに余裕がない場合とは、全水平ライン分の液晶書き込みを行った後に、次画面分の液晶書き込みを開始するまでの間に、全画面分のセンサ読み出し専用の水平周期を追加する時間的な余裕がないことを意味している。すなわち、先の実施の形態１では、時間的な余裕があったため、複合ライン信号の水平周期を、本来のライン信号の水平周期と同一にすることができた。しかしながら、本実施の形態２では、時間的な余裕がないため、複合ライン信号の水平周期を、本来のライン信号の水平周期よりも短くする必要があり、その具体的な解決策について、以下に説明する。   Here, when there is no room for liquid crystal writing for all horizontal lines, sensor reading for all screens is performed after the liquid crystal writing for all horizontal lines is started and the liquid crystal writing for the next screen is started. This means that there is no time to add a dedicated horizontal period. That is, in the first embodiment, since there was a time margin, the horizontal cycle of the composite line signal could be made the same as the horizontal cycle of the original line signal. However, in the second embodiment, since there is no time allowance, it is necessary to make the horizontal period of the composite line signal shorter than the horizontal period of the original line signal. explain.

図４は、本発明の実施の形態２の液晶表示装置におけるゲート信号に対する液晶書き込みタイミングとセンサ読み出しタイミングの関係を示した説明図であり、水平方向の４ラインごとに１つの光学センサが設けられている場合を例示している。より具体的には、上段が従来のタイミングを示したものであり。後段が本実施の形態２のタイミングを示したものである。   FIG. 4 is an explanatory diagram showing the relationship between the liquid crystal writing timing and the sensor reading timing with respect to the gate signal in the liquid crystal display device according to the second embodiment of the present invention, and one optical sensor is provided for every four horizontal lines. The case is shown as an example. More specifically, the upper part shows the conventional timing. The latter part shows the timing of the second embodiment.

図４に示したように、複合ライン信号の水平周期は、本来のライン信号の水平周期よりも短く設定されている。そして、この図４では、４水平周期（ｎ＝４に相当）ごとに１回、センサ読み出し専用の水平周期を新たに挿入するために、本来のライン信号の４水平周期分が、複合ライン信号の５水平周期分と等しくなるように、複合ライン信号の水平周期を規定した場合を示している。   As shown in FIG. 4, the horizontal cycle of the composite line signal is set shorter than the horizontal cycle of the original line signal. In FIG. 4, in order to newly insert a horizontal period dedicated to sensor reading once every four horizontal periods (corresponding to n = 4), four horizontal periods of the original line signal are converted into composite line signals. In this case, the horizontal period of the composite line signal is defined so as to be equal to 5 horizontal periods.

この関係を、ｎを使って表すと、次式（１）のようになる。
複合ライン信号の水平周期＝ｎ／（ｎ＋１）・本来のライン信号の水平周期 （１）
このようにして、複合ライン信号の水平周期を本来のライン信号の水平周期よりも短くすることにより、ｎ水平周期に１回、センサ読み出し専用の水平周期を新たに挿入した複合ライン信号を生成することができる。なお、図４においては、水平周期を短くする比率をｎ／（ｎ＋１）として場合について例示しているが、これよりも小さい比率にすることも可能である。 When this relationship is expressed using n, the following equation (1) is obtained.
Horizontal period of composite line signal = n / (n + 1) .Horizontal period of original line signal (1)
In this way, by making the horizontal period of the composite line signal shorter than the horizontal period of the original line signal, a composite line signal in which a horizontal period dedicated to sensor reading is newly inserted once every n horizontal periods is generated. be able to. In FIG. 4, the case where the ratio of shortening the horizontal period is n / (n + 1) is illustrated, but a ratio smaller than this is also possible.

図５は、本発明の実施の形態２の液晶表示装置において、センサ読み出し専用の水平周期を新たに設けるための具体的な回路図である。ここでは、先の図４に対応して、水平方向の４ラインごとに１つの光学センサが設けられている場合における動作について説明する。先の実施の形態１における図２の構成と比較すると、本実施の形態２における図５の構成は、ＰＬＬ（Ｐｈａｓｅ Ｌｏｃｋｅｄ Ｌｏｏｐ：位相同期ループ）回路６０をさらに備えている点が異なっている。   FIG. 5 is a specific circuit diagram for newly providing a horizontal period dedicated to sensor reading in the liquid crystal display device according to the second embodiment of the present invention. Here, the operation in the case where one optical sensor is provided for every four horizontal lines corresponding to FIG. 4 will be described. Compared with the configuration of FIG. 2 in the first embodiment, the configuration of FIG. 5 in the second embodiment is different in that it further includes a PLL (Phase Locked Loop) circuit 60.

タイミングコントローラ１０は、本来の液晶書き込み用の水平周期を有するライン信号に基づいて、液晶書き込みタイミングをｎ（ただし、ｎは、あらかじめ決められた１以上の整数であり、この説明においてはｎ＝４）周期発生させた後ごとに、センサ読み出しタイミングを１周期発生させるようにして、複合ライン信号（図４参照）を生成する。   The timing controller 10 sets the liquid crystal writing timing to n (where n is a predetermined integer of 1 or more based on the line signal having the original horizontal period for liquid crystal writing. In this description, n = 4. ) A composite line signal (see FIG. 4) is generated by generating one cycle of sensor readout timing every time after the generation.

特に、本実施の形態２のように、全水平ライン分の液晶書き込みに余裕がない場合には、タイミングコントローラ１０は、上式（１）に従って、複合ライン信号を生成する必要がある。そこで、ＰＬＬ回路６０は、ライン信号のクロック信号に基づいて、複合ライン信号の水平周期を規定する。   In particular, when there is no allowance for liquid crystal writing for all horizontal lines as in the second embodiment, the timing controller 10 needs to generate a composite line signal according to the above equation (1). Therefore, the PLL circuit 60 defines the horizontal period of the composite line signal based on the clock signal of the line signal.

そして、タイミングコントローラ１０は、ＰＬＬ回路６０で規定された水平周期に基づいて、ｎ＝４の場合を例に取ると、４水平周期に１回、センサ読み出し専用の水平周期を新たに挿入することにより、複合ライン信号を生成すればよい。   Then, based on the horizontal period defined by the PLL circuit 60, the timing controller 10 inserts a new horizontal period dedicated to sensor reading once every four horizontal periods, taking the case of n = 4 as an example. Thus, a composite line signal may be generated.

ラインメモリ２０は、液晶表示パネルに表示されるデータ信号を複数ライン分記憶するメモリである。そして、データ信号読み出し回路３０は、タイミングコントローラ１０で生成された複合ライン信号の各水平周期のうち、液晶書き込みに割り当てられたタイミング信号を受信し、そのタイミングでラインメモリ２０から所望のラインのデータ信号を取り出す。   The line memory 20 is a memory for storing a plurality of lines of data signals displayed on the liquid crystal display panel. The data signal readout circuit 30 receives the timing signal assigned to the liquid crystal writing in each horizontal period of the composite line signal generated by the timing controller 10, and at the timing, the data of the desired line is received from the line memory 20. Retrieve the signal.

一方、検出信号読み出し回路４０は、タイミングコントローラ１０で生成された複合ライン信号の各水平周期のうち、センサ読み出しに割り当てられた専用のタイミング信号を受信し、そのタイミングで光学センサ５０の検出結果を読み出す。このように、センサ読み出し専用の水平周期を有する複合ライン信号に基づいて、光学センサ５０の検出信号を取り出すことにより、液晶書き込みによるノイズの影響を減少させて検出信号を取り出すことが可能となる。   On the other hand, the detection signal reading circuit 40 receives a dedicated timing signal assigned to sensor reading out of each horizontal cycle of the composite line signal generated by the timing controller 10 and outputs the detection result of the optical sensor 50 at that timing. read out. In this way, by extracting the detection signal of the optical sensor 50 based on the composite line signal having a horizontal period dedicated to sensor reading, it is possible to reduce the influence of noise caused by liquid crystal writing and extract the detection signal.

以上のように、実施の形態２によれば、全水平ライン分の液晶書き込みに余裕がない場合にも、複合ライン信号の水平周期を、本来のライン信号の水平周期よりも短く設定することにより、先の実施の形態１と同様の効果を得ることができる。   As described above, according to the second embodiment, the horizontal cycle of the composite line signal is set to be shorter than the horizontal cycle of the original line signal even when there is no allowance for liquid crystal writing for all horizontal lines. The same effect as in the first embodiment can be obtained.

なお、図５の構成においては、タイミングコントローラ１０、ラインメモリ２０、データ信号読み出し回路３０、検出信号読み出し回路４０、およびＰＬＬ回路６０を別々の構成として示したが、タイミングコントローラ１０の中に、ラインメモリ２０、データ信号読み出し回路３０、検出信号読み出し回路４０、およびＰＬＬ回路６０を含める構成とすることも可能である。   In the configuration of FIG. 5, the timing controller 10, the line memory 20, the data signal readout circuit 30, the detection signal readout circuit 40, and the PLL circuit 60 are shown as separate configurations. A configuration including the memory 20, the data signal readout circuit 30, the detection signal readout circuit 40, and the PLL circuit 60 is also possible.

本発明の実施の形態１の液晶表示装置におけるゲート信号に対する液晶書き込みタイミングとセンサ読み出しタイミングの関係を示した説明図である。It is explanatory drawing which showed the relationship between the liquid-crystal writing timing with respect to the gate signal in the liquid crystal display device of Embodiment 1 of this invention, and sensor reading timing. 本発明の実施の形態１の液晶表示装置において、センサ読み出し専用の水平周期を新たに設けるための具体的な回路図である。FIG. 3 is a specific circuit diagram for newly providing a horizontal period dedicated to sensor reading in the liquid crystal display device according to the first embodiment of the present invention. 本発明の実施の形態１における液晶表示装置のセンサ出力と従来の液晶表示装置のセンサ出力を比較した図である。It is the figure which compared the sensor output of the liquid crystal display device in Embodiment 1 of this invention, and the sensor output of the conventional liquid crystal display device. 本発明の実施の形態２の液晶表示装置におけるゲート信号に対する液晶書き込みタイミングとセンサ読み出しタイミングの関係を示した説明図である。It is explanatory drawing which showed the relationship between the liquid-crystal write timing with respect to the gate signal in the liquid crystal display device of Embodiment 2 of this invention, and a sensor read-out timing. 本発明の実施の形態２の液晶表示装置において、センサ読み出し専用の水平周期を新たに設けるための具体的な回路図である。In the liquid crystal display device of Embodiment 2 of this invention, it is a concrete circuit diagram for newly providing the horizontal period only for sensor reading. 光学センサを内蔵した従来の液晶表示装置の回路図である。It is a circuit diagram of the conventional liquid crystal display device incorporating the optical sensor. 従来の液晶表示装置におけるゲート信号に対する液晶書き込みタイミングとセンサ読み出しタイミングの関係を示した説明図である。It is explanatory drawing which showed the relationship between the liquid-crystal write timing with respect to the gate signal in a conventional liquid crystal display device, and a sensor read-out timing. 従来の液晶表示装置における表示画面とセンサ出力とを対比した図である。It is the figure which contrasted the display screen and sensor output in the conventional liquid crystal display device.

符号の説明Explanation of symbols

１０ タイミングコントローラ、２０ ラインメモリ、３０ データ信号読み出し回路、４０ 検出信号読み出し回路、５０ 光学センサ、６０ ＰＬＬ回路。   10 timing controller, 20 line memory, 30 data signal readout circuit, 40 detection signal readout circuit, 50 optical sensor, 60 PLL circuit.

Claims (4)

光学センサを内蔵した液晶表示装置であって、
水平ラインごとの液晶書き込みタイミングを規定するライン信号を生成するライン信号生成部と、
前記ライン信号生成部で生成された前記ライン信号を読み込み、水平ラインｎ本（ただし、ｎは１以上の整数）ごとに１回、前記液晶書き込みタイミングと重複しないタイミングで前記光学センサからの検出信号読み出しタイミングを規定し、前記液晶書き込みタイミングおよび前記検出信号読み出しタイミングの両方を重複しないタイミングで規定した所定周期の複合ライン信号を生成するタイミングコントローラと
を備えることを特徴とする液晶表示装置。 A liquid crystal display device incorporating an optical sensor,
A line signal generation unit that generates a line signal that defines the liquid crystal writing timing for each horizontal line;
The line signal generated by the line signal generator is read, and a detection signal from the optical sensor once every n horizontal lines (where n is an integer of 1 or more) at a timing that does not overlap with the liquid crystal writing timing. A liquid crystal display device comprising: a timing controller that defines a read timing and generates a composite line signal having a predetermined cycle that is defined by a timing that does not overlap both the liquid crystal write timing and the detection signal read timing. 請求項１に記載の液晶表示装置において、
前記タイミングコントローラは、全水平ライン分の液晶書き込みに余裕がある場合には、前記複合ライン信号の１ライン分の水平周期に相当する前記所定周期を、前記液晶書き込みタイミングを規定するライン信号の１ライン分の水平周期と同一とし、前記液晶書き込みタイミングをｎ周期発生させた後ごとに、前記検出信号読み出しタイミングを１周期発生させるようにして、前記複合ライン信号を生成することを特徴とする液晶表示装置。 The liquid crystal display device according to claim 1.
When there is a margin in the liquid crystal writing for all horizontal lines, the timing controller sets the predetermined period corresponding to the horizontal period for one line of the composite line signal to 1 of the line signal that defines the liquid crystal writing timing. The composite line signal is generated by generating the detection signal reading timing for one period every time the liquid crystal writing timing is generated for n periods, the same as the horizontal period for the line. Display device. 請求項１に記載の液晶表示装置において、
前記タイミングコントローラは、全水平ライン分の液晶書き込みに余裕がない場合には、前記ライン信号のクロック信号に基づいて、前記複合ライン信号の１ライン分の水平周期に相当する前記所定周期を、前記液晶書き込みタイミングを規定するライン信号の１ライン分の水平周期のｎ／（ｎ＋１）倍とし、前記液晶書き込みタイミングをｎ周期発生させた後ごとに、前記検出信号読み出しタイミングを１周期発生させるようにして、前記複合ライン信号を生成することを特徴とする液晶表示装置。 The liquid crystal display device according to claim 1.
The timing controller, when there is no margin for liquid crystal writing for all horizontal lines, based on the clock signal of the line signal, the predetermined period corresponding to the horizontal period of one line of the composite line signal, The line signal for defining the liquid crystal writing timing is set to n / (n + 1) times the horizontal period of one line, and the detection signal reading timing is generated for one period every time the liquid crystal writing timing is generated for n periods. And generating the composite line signal. 光学センサを内蔵した液晶表示装置の駆動方法であって、
水平ラインごとの液晶書き込みタイミングを規定するライン信号を生成するステップと、
生成された前記ライン信号を読み込み、水平ラインｎ本（ただし、ｎは１以上の整数）ごとに１回、前記液晶書き込みタイミングと重複しないタイミングで前記光学センサからの検出信号読み出しタイミングを規定し、前記液晶書き込みタイミングおよび前記検出信号読み出しタイミングの両方を重複しないタイミングで規定した所定周期の複合ライン信号を生成するステップと
を備えることを特徴とする液晶表示装置の駆動方法。 A method of driving a liquid crystal display device incorporating an optical sensor,
Generating a line signal defining liquid crystal writing timing for each horizontal line;
Read the generated line signal and define the detection signal read timing from the optical sensor once every n horizontal lines (where n is an integer of 1 or more) at a timing that does not overlap with the liquid crystal writing timing, And a step of generating a composite line signal having a predetermined period defined by a timing that does not overlap both the liquid crystal writing timing and the detection signal reading timing.
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JP2013097469A (en) * 2011-10-28 2013-05-20 Sharp Corp Touch panel driving device, display device, touch panel driving method, program, and recording medium
JP2015122125A (en) * 2015-04-01 2015-07-02 株式会社ジャパンディスプレイ Display panel with touch detection function, driving method therefor, driving circuit, and electronic apparatus
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