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WO2009012635A1 - Dispositif d'affichage à matrice de diodes électroluminescentes - Google Patents

Dispositif d'affichage à matrice de diodes électroluminescentes Download PDF

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Publication number
WO2009012635A1
WO2009012635A1 PCT/CN2008/000033 CN2008000033W WO2009012635A1 WO 2009012635 A1 WO2009012635 A1 WO 2009012635A1 CN 2008000033 W CN2008000033 W CN 2008000033W WO 2009012635 A1 WO2009012635 A1 WO 2009012635A1
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WO
WIPO (PCT)
Prior art keywords
led
column
signal
infrared
light
Prior art date
Application number
PCT/CN2008/000033
Other languages
English (en)
French (fr)
Inventor
I-Hsuan Hsieh
Original Assignee
I-Hsuan Hsieh
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.)
Filing date
Publication date
Application filed by I-Hsuan Hsieh filed Critical I-Hsuan Hsieh
Priority to US12/670,550 priority Critical patent/US20100194714A1/en
Publication of WO2009012635A1 publication Critical patent/WO2009012635A1/zh

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Classifications

    • 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
    • G06F3/0304—Detection arrangements using opto-electronic means
    • G06F3/0317—Detection arrangements using opto-electronic means in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface
    • 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
    • G06F3/03545—Pens or stylus
    • 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
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G06F3/0386—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry for light pen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/06—Passive matrix structure, i.e. with direct application of both column and row voltages to the light emitting or modulating elements, other than LCD or OLED
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]

Definitions

  • the invention belongs to the field of photoelectric display, and in particular relates to an LED matrix device with a light pen function. Background technique
  • the LED matrix device has a reduced unit price and improved reliability, and is used in a large number of display panels. Recently, with the development of organic LED technology, LED matrix devices have also been used in small portable products. However, current LED matrix devices have only the functions displayed but no input functions.
  • Common display input methods include touch screens and light pens. Whether the touch screen is capacitive or resistive, the cost is relatively expensive, and the touch screen control circuit must be additionally added. And the touch screen must be corrected after using it for a while.
  • the light pen is cheap, and the front end includes a light sensor that can accept the trigger of the light spot on the screen. In addition, the light pen needs to receive the horizontal and vertical sync signals of the screen to determine the position of the light pen on the screen when the trigger is triggered.
  • the light pen cannot work on the background without light, so the light pen is often used for single selection, and the option is generally reversed to facilitate the selection of the light pen. Therefore, the general LED matrix cannot use the stylus. And the general light pen can't be circled on a black background with no light spots. Summary of the invention
  • An object of the present invention is to provide an LED matrix display device, which aims to solve the problem that the prior art light pen cannot be circled on the background of the matte point.
  • the LED matrix display device comprising: an LED matrix, comprising a plurality of display units connected by rows and columns, each display unit comprising an infrared LED and at least one visible light LED; and a data driving circuit, Receiving external data and driving the LED matrix to generate different visible LED patterns, and driving the infrared LED; the column scanning circuit includes a visible light LED column scanning circuit and an infrared LED column scanning circuit for generating a column signal for driving the LED matrix; and timing Electricity
  • the current display level and vertical position information can be output.
  • the LED matrix and CRT screen scan are different, because the CRT (Cold Cathode Tube) screen scan is a light point from top to bottom, from left to right scan, as long as the light pen's receiving sensor has received light trigger, according to the screen from the screen.
  • the horizontal and vertical sync signals and the address counters completed by the frequency can be used to infer the current position of the stylus.
  • the LED matrix lights up a whole row of LEDs at the same time, so that when the light pen senses light, it can only determine which row, but it cannot judge which LED is emitted by a row.
  • an infrared LED can be placed on each of the LED matrix rows and columns, and the light receiver of the opposite external light pen is also changed to an infrared receiver.
  • the portion of the visible light that maintains the same drive as the existing LED matrix can be a row scan or a column scan.
  • the infrared scanning method can also be a line scanning or a column scanning, but unlike the visible light driving, when one line of visible light (column) is scanned, the entire line (column) of visible light is simultaneously driven.
  • the external light pen can analyze the position of the row and column of the infrared LED at the time of triggering according to the provided timing signal.
  • control signal can be additionally increased, so that the parts of the infrared light LED ⁇ are successively operated by one device and one device in series, and the control signals can also be used to know which one is currently.
  • the LED matrix device is working. This allows the external stylus to work properly when the LED matrix devices are connected in series.
  • the scanning frequency of visible light and infrared light it does not have to be the same. It can be determined by the number of serial connections and the infrared scanning frequency. When not connected in series, the scanning frequency of both can be selected to be the same, which simplifies the circuit.
  • the infrared light is illuminated one by one in the same column (row), whether it is static lighting or modulation can be determined according to the position of the light pen. If the light pen works directly on the LED matrix, it can be statically lit. When there is a considerable distance from the LED matrix, the modulation method can facilitate the internal filtering of the light pen.
  • the wave amplifying circuit uses the demodulating circuit to distinguish whether or not there is a modulated infrared spot signal.
  • infrared light LED sensing Another advantage of using infrared light LED sensing is that the infrared light LED is invisible light and therefore does not interfere with the display of the visible light LED. It can be lit one by one row by row. It is also because of this, the general CRT screen light pen can not sense the black no bright spots part of the shortcomings also overcome. Since even the visible light LED portion is not illuminated at all, the infrared light LED portion of the light pen of the present invention is still operating normally. Attached
  • FIG. 1 is a circuit diagram of a column scan of a prior art LED device
  • 1A is a circuit diagram of a line scan of a prior art LED device
  • FIG. 2 is a circuit diagram of a prior art monochrome display unit
  • FIG. 3 is a circuit diagram of a prior art multi-color display unit
  • FIG. 4 is a circuit diagram of a monochrome display unit in accordance with an embodiment of the present invention.
  • Figure 5 is a circuit diagram of a column scan of an LED device according to an embodiment of the present invention.
  • 5A is a circuit diagram of a line scan of an LED device according to an embodiment of the present invention.
  • FIG. 6 is a timing diagram of a prior art column scan driving method
  • FIG. 8 is a timing chart of a column scan driving method according to an embodiment of the present invention.
  • FIG. 8A is a timing diagram of a line scan driving method according to an embodiment of the present invention.
  • FIG. 9 is a timing diagram of signals provided to an external stylus according to an embodiment of the present invention.
  • Figure 10 is a timing chart of signals supplied to an external stylus when connected in series according to an embodiment of the present invention.
  • Figure 11 is a schematic view of the embodiment of the present invention in series.
  • the first scanning device of the sequential circuit enables the synchronization signal FS
  • the next stage of the sequential circuit enables the output signal EO
  • Sweep ⁇ ⁇ drive circuit first column visible light LED drive signal S1 (column scan implementation) scan drive circuit first row infrared LED drive signal Q1 (column scan implementation)
  • Scan drive circuit second line infrared LED drive signal Q2 (column scan implementation)
  • Data drive circuit first column visible light LED drive signal S1 (row scan implementation) data drive circuit first column infrared light LED drive signal T1 (row scan implementation) data drive circuit second column infrared light LED drive signal T2 (line scan Embodiment)
  • Data drive circuit nth column infrared light LED drive signal T1 (row scan embodiment) data drive circuit first column infrared LED drive signal T1 (column scan implementation)
  • Data drive circuit first line visible light LED drive signal P1 (column scan implementation)
  • Scan drive circuit first line infrared LED drive signal Q1 (line scan implementation)
  • Scanning drive circuit first line visible light LED driving signal P1 (row scanning embodiment)
  • the existing LED matrix has two types of FIG. 1 and FIG. 1A respectively, and the two control modes are different, FIG. 1 It is a column scanning method, and FIG. 1A is a line scanning method. But both display an entire column (row) of m(n) LED display units at a time, and a column (row) column (row) column by column (row) display a total of n (m) columns (rows).
  • the conventional LED display unit has a visible light LED or more than one visible light LED according to a single or multi-color LED matrix, as shown in FIG. 2 and FIG. 3 respectively.
  • an infrared light LED is additionally added to the display unit. Taking monochrome as an example, 11 in Fig.
  • the infrared LED driving method can be either a row scan or a column scan, and both of them are used. Therefore, the infrared LED scan is mainly based on column scanning.
  • each column of LEDs has kxr LEDs. That is m - kxr.
  • the monochromatic and multi-color LED matrix has the same number and color of LEDs in the LED display unit, and the driving method is the same. Therefore, the description of the present invention is mainly a monochromatic LED matrix, and the multi-color LED matrix driving is equivalent to a larger number of monochrome. LED.
  • Figure 1 mode LED matrix scan lines Sl ⁇ Sn are sequentially supplied with power, and external data is sent to the data drive circuit.
  • the data drive circuit sends P1 ⁇ Pm signals according to different data values to control the LED matrix to display the relevant pattern.
  • Figure 1 shows the more common control method.
  • Figure 1A shows the design of U.S. Patent No. 5,748,160.
  • P l ⁇ P m will sequentially generate different stepped voltages by the scanning drive circuit, in monochrome. For example, the LED matrix is first turned on by P 1 , then P 2 , and then sequentially row by row. Each time the voltage is given, the external data is sent to the data driving circuit to generate different S l ⁇ S n control signals, respectively lighting the LEDs of different columns on the same row to generate the required graphics.
  • the embodiment of the present invention can be applied to the visible light LED matrix driving mode of FIG. 1 and FIG. 1A respectively, because the embodiment of the present invention is an LED with more infrared light, and the added driving circuit drives the infrared light LED, and the partial driving of the visible light is maintained. constant.
  • This embodiment will take the visible light LED matrix driving mode of FIG. 1 as an example to illustrate how to drive an LED matrix with an embedded infrared LED, as shown in FIG.
  • the visible light driving scanning mode is changed from the original column scanning to the line scanning, and the driving control mode is different from that of FIG. 5.
  • the actual principle of the operation portion of the light pen in Fig. 5A is the same as that of Fig. 5, except that the row and column are exchanged.
  • FIG. 6 is a waveform of a conventional column scanning.
  • S1 starts to supply power at time t1, and P1 and P2 to Pm-column voltages are respectively controlled according to external data input by the user, resulting in the first A pattern of LED lights.
  • the power supply is sequentially started at time t2, and the P1 and P2 to Pm-column voltages are respectively controlled according to external data input by the user, and the pattern of the LED lamps of the second column is generated.
  • the S3, S4, ... Sn in sequence completes the scanning of an entire picture. Then scan the next screen column by column starting from S1.
  • the embodiment of the invention is in the visible light LED, and the scanning mode is the same as the existing LED matrix.
  • the k*n infrared LEDs can provide the driving signals of ⁇ ., ⁇ and Ql..Qk, and provide signals to the stylus outside the LED device. So that the stylus can calculate the position of the current infrared spot.
  • FIG. 8 presents a column scanning method of an embodiment of the present invention, similar to visible light.
  • the infrared LED is scanned column by column by Tl..Tn.
  • the power supply interval of T1 (41) in Figure 8 is similar to that of S1 (31).
  • Pl..Pm ( 42 ) of visible light it is driven by external data.
  • Ql, Q2, ..Qk (32, 33, 34 in Fig. 8) are lit one by one, at the same time ( Ql, q2, ..qn) There will be no more than one infrared LED lit at the same time.
  • the illuminated waveform can be a static power supply state or a waveform of a certain modulation frequency.
  • the period of the T1 power supply tl' and the tl of the S1 are not necessarily the same, and can be determined according to the LED matrix size and the number of series connections. If tl' is equal to tl, then Tl ⁇ Tn can be driven by the waveform of S1 ⁇ Sn-like, so that the part of the LED matrix can be connected to T1 - Tn directly after the inside of the LED matrix. Sl ⁇ Sn can be used, which simplifies the system design of the embodiment of the present invention.
  • FIG. 8A is a row scanning implementation manner according to an embodiment of the present invention.
  • 7 is a driving method of the conventional line scanning. It can be seen that the row driving signals are respectively sent from PI, P2, to Pm, and the power supply signals are sequentially sent at t1, t2, ..tm, and S1 to Sn are simultaneously based on external data. A signal that lights up or goes out.
  • FIG. 8A is a driving method of a line scan according to an embodiment of the present invention. It can be seen that similar to the scanning of the column of FIG. 8, the focus is on scanning the infrared LED, whether it is progressive or column-by-row scanning, the infrared LEDs must be one by one. Light up in sequence In Fig. 8A, 32A, 33A, and 34A cannot have more than one infrared LED simultaneously, so that the external light pen can judge the position of the infrared light spot.
  • Figure 9 provides a signal to an external stylus
  • TRIG is a trigger signal for an external stylus to sense infrared light
  • HS (21) and VS (22) are signals provided to the eve light pen according to an embodiment of the present invention.
  • the HS is synchronized with the column (or row) scan signal and the period is a fixed ratio M
  • Vs is synchronized with the first column (or row) supply signal of the column (or row) scan and the period is a fixed ratio N.
  • the ratio of the time difference tg between the rising edge of the TRIG trigger point and the rising edge of the VS to the VS period tv, and the ratio X of the TRIG to the time of the previous HS from the previous HS, can be used to know which scanning line the trigger point TRIG is. And which infrared
  • the LED point is triggered to know the current position of the light pen.
  • the detailed calculation is as follows:
  • Th MxtY; (column scan tl' reference figure 8, line scan tl' reference figure 8A)
  • Tv Nxtl' n; (for column scan, tl' and n refer to Figure 8)
  • Tv Nxtl k; (when scanning, tl' and k refer to Figure 8A)
  • the external light pen can calculate the position of the light pen in the LED matrix display.
  • the reason why the simplification is calculated by X, Y, M, N is because M, N is a parameter known at the time of system design.
  • X, Y is the relative relationship between TRIG point and HS, VS.
  • the external light pen can easily obtain the internal frequency, and set the counter to calculate the width of HS, VS and TRIG respectively.
  • M the value of N can be 1 or other fixed numbers to facilitate the system frequency design of the external stylus.
  • FS is the FRAME synchronization signal synchronized with the scan plane period. If there is a LED matrix serially connected, the period tf of the FS is a times the entire scan plane period tv'. That is, in Figure 10,
  • Tv' tYxn (for column scan, tl' and n refer to Figure 8)
  • EI is the external infrared device power supply input signal
  • EO is the power supply output of the next-stage infrared device.
  • the output of EO is de-energized when the system is reset.
  • the infrared LED portion of this LED matrix will only function during this tv' cycle whenever the tv' cycle begins and the EI input is also powered.
  • the EI signal is powered at this tv 'cycle, the EO will supply power at the beginning of the next tv' cycle, allowing the next level of the LED matrix to operate in the next tv' cycle.
  • Such a portion of the infrared LED will operate one device at a time, one at a time, one tV cycle at a time.
  • the manner of serial connection is as shown in Fig.
  • control includes the HS, VS signal in Fig. 9.
  • HS, VS, and FS come from the timing circuit.
  • the external light pen needs to have the HS of Figure 9, the VS information to calculate the ratio of th, tv and tg, and must increase the proportional relationship between the calculation of the FS period tf and tg to estimate which TRIG is connected in series. Occurs when the VS period of the LED matrix acts.
  • the row and column position calculation of the trigger point in tandem is the same as when the string is not connected.
  • the device of the embodiment of the present invention adds an infrared LED to the display unit of the conventional LED matrix, and increases the driving signal of the infrared LED in addition to the conventional visible light driving signal. Therefore, any time the infrared LED does not have more than one power supply state, and the timing signal of the embodiment of the present invention additionally provides the synchronization signals HS and VS of the external light pen, so that the external light pen can calculate the rank of the infrared light trigger point. position.
  • the present invention also provides a synchronization signal FS of the device used in the serial connection, which allows the external light pen to calculate which of the infrared light spots emitted by the serial connection.
  • the external infrared device power supply input signal EI used in series connection and the power supply output EO of the next-stage infrared device are sequentially connected as shown in FIG. 11 to make the infrared portion of the LED matrix device at any time, and only one device is powered. Therefore, the external light pen can be triggered by the infrared LED and the FS The positional relationship is calculated to be triggered by the LED matrix device in the series.
  • the present invention provides a light pen interface that is not originally provided, and overcomes the disadvantage that the conventional cold cathode tube screen light pen cannot be sensed without a bright spot area by using an infrared LED method in which invisible light is embedded. It also provides a serial signal for use in series connection. Novel and progressive, and commercially practical.
  • the device of the embodiment of the invention adds an infrared LED to the display unit of the conventional LED matrix, and increases the driving signal of the infrared LED in addition to the driving signal of the conventional visible light: no infrared LED will be present at any time.
  • the above is in the state of power supply, and the timing signals of the embodiment of the present invention are additionally provided to the synchronization signals HS and VS of the external light pen, so that the external light pen can calculate the position of the trigger position of the infrared light trigger point.
  • the present invention also provides a synchronization signal FS for the device to be used in series connection, which allows the external light pen to calculate which infrared light spot is emitted by the serially connected device.
  • the external infrared device power supply input signal EI used in series connection and the power supply output EO of the next-stage infrared device are sequentially connected as shown in Fig. 11 to make the infrared portion of the LED matrix device at any time, and only one device is powered. Therefore, the external light pen can be triggered by the LED matrix device in the series according to the positional relationship between the infrared LED trigger point and the FS.
  • the present invention provides a light pen interface that is not originally provided, and overcomes the disadvantage that the conventional cold cathode tube screen light pen cannot be sensed without a bright spot by using an infrared LED method in which invisible light is embedded. It also provides a serial signal that is used when the rate is connected. Novel and progressive, and commercially practical.

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  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Description

LED矩阵显示装置 技术领域
本发明属于光电显示领域， 尤其涉及一种具有光笔功能的 LED矩阵装置。 背景技术
LED矩阵装置随者 LED的单价降低和可靠性提高， 被大量的用在大型的 显示板上。 近来， 随着有机 LED ( organic LED)技术的发展， LED矩阵装置也 用在小型的可携式产品上。但是目前的 LED矩阵装置只有显示的功能而没有输 入的功能。
常见的显示屏输入方式包括触控屏和光笔。 触控屏无论是使用电容式或电 阻式， 造价都较昂贵， 而且必须另外增加触控屏控制电路。 并且触控屏使用一 段时间后必须校正。 光笔价格便宜， 其前端包括光感应器， 可以接受屏幕上光 点的触发， 另外光笔需要接收 幕的水平及垂直同步信号， 判断触发时光笔在 屏幕上的位置。 但在没有光的背景上光笔无法工作， 因此光笔常用于单选的选 择， 在选项一般为反白的方块， 以方便光笔选择。 因此一般 LED矩阵不能使用 光笔。 而且一般光笔， 无法圈点于无光点的黑色背景上。 发明内容
本发明实施例的目的在于提供一种 LED矩阵显示装置， 旨在解决现有技术 光笔无法圈点于无光点的背景的问题。
本发明实施例是这样实现的， 一种 LED矩阵显示装置， 包括： LED矩阵， 包括多个行列交接的显示单元，每个显示单元包括一个红外 LED及至少一个可 见光 LED; 行数据驱动电路， 用于接收外部数据并驱动 LED矩阵以产生不同 的可见光 LED图案 , 并驱动红外 LED; 列扫描电路， 包括可见光 LED列扫描 电路和红外 LED列扫描电路， 用于产生驱动 LED矩阵的列信号； 以及时序电
1
确认本 路， 用于产生供外部光笔使用的信号以及用于列扫描驱动电路和行数据驱动电 路的信号。
为了使现有的 LED矩阵能使用光笔，可将目前的显示水平与垂直位置信息 输出。 但是 LED矩阵和 CRT屏幕扫描不同， 因为 CRT (冷阴极管）屏幕扫描 是一个光点由上而下， 自左而右的扫描， 只要是光笔的接收感应器有接受光线 触发， 把根据来自屏幕的水平及垂直同步信号及频率所完成的地址计数器， 就 可以推断目前光笔的位置。 但是 LED矩阵是一次同时点亮一整排的 LED, 所 以当光笔感应到有光线时只能判断是哪一排， 但是不能判断是一排上哪一个 LED所发出的光线。
因此， 可在每个 LED 矩阵行列交错的显示羊元上加摆上一个红外线的 LED, 相对的外部光笔的光线接受器也改为红外线接收器。 在可见光的部分维 持和现有的 LED矩阵相同的驱动，可以是行扫描或列扫描。红外光扫描方式也 可以是行扫描或列扫描， 但和可见光驱动不同处， 是可见光扫描一行（列）时， 是整行（列）可见光一起同时驱动。 本发明实施例红外光在扫描同一列 （行） 时， 于同一列上的红外线 LED, 分别逐次的点亮， 如此可以保证红外线 LED 在任何时候不会有一个以上的红外线 LED是亮的。因此外部光笔根据提供的时 序信号， 就可以分析出触发当时红外线 LED的行列位置。
为了考虑有串接 LED矩阵的需求,可另外增加控制信号， 使得红外光 LED ^ 的部分在串接时会一个装置一个装置的逐次工作下去， 而也经由这些控制信号 可以得知目前是哪一个 LED矩阵装置正在工作。 如此可以在 LED矩阵装置串 接起来时， 外部的光笔也能正常工作。
至于可见光与红外光的扫描频率， 并不一定要相同。 可以视串接的数量及 红外线扫描频率决定， 在不串接时， 可以选择两者的扫描频率相同， 如此可以 简化电路。 扫描红外光同一列 （行）每一点逐一点亮时， 是否以静态点亮或调 制的方式， 可以视光笔位置而定， 如果光笔是直接在 LED矩阵上工作， 静态点 亮即可， 若光滗离 LED矩阵有相当距离时， 则以调制方式可以方便光笔内部滤 波放大电路， 之后再以解调电路分辨是否有接受到调制的红外光点信号。
使用红外光 LED的感应方式的另一个优点， 是红外光 LED是不可见光因 此不会干扰可见光 LED的显示， 可以逐列逐行 一个个全部点亮。也正因为如 此， 一般 CRT屏幕光笔无法感应黑色无亮点部分的缺点也一起克服。 因为即便 是可见光 LED部分全部没有点亮， 但本发明光笔用红外光 LED部分依然工作 正常。 附,图说明
图 1是现有技术 LED装置列扫描的电路图；
图 1A是现有技术 LED装置行扫描的电路图；
图 2是现有技术单色显示单元的电路图；
图 3是现有技术多色显示单元的电路图；
图 4是本发明实施例单色显示单元的电路图；
图 5是本发明实施例 LED装置列扫描的电路图；
图 5A是本发明实施例 LED装置行扫描的电路图；
图 6是现有技术列扫描驱动方式的时序图；
图 7是现有技术行扫描驱动方式的时序图；
图 8是本发明实施例列扫描驱动方式的时序图；
图 8A是本发明实施例行扫描驱动方式的时序图；
图 9是本发明实施例提供给外部光笔的信号的时序图；
图 10是本发明实施例串接时提供给外部光笔的信号的时序图； 以及 图 11是本发明实施例串接时的示意图。
Figure imgf000005_0001
波形高或 4氐电位： 〈
调制波或高电位： HHHIIIHHHIII
图式中元件符号说明：
时序电路的扫描线同步信号 HS
时序电路的第一扫描线同步信号 VS
时序电路的第一扫描装置致能同步信号 FS
时序电路的外部红外装置致能输入信号 EI
时序电路的下一级红外装置致能输出信号 EO
扫^ ^驱动电路第一列可见光 LED驱动信号 S1 (列扫描实施方式） 扫描驱动电路第一行红外 LED驱动信号 Q1 (列扫描实施方式）
扫描驱动电路第二行红外 LED驱动信号 Q2 (列扫描实施方式）
扫描驱动电路第 n行红外 LED驱动信号 Qn (列扫描实施方式）
数据驱动电路第一列可见光 LED驱动信号 S1 (行扫描实施方式） 数据驱动电路第一列红外光 LED驱动信号 T1 (行扫描实施方式） 数据驱动电路第二列红外光 LED驱动信号 T2 (行扫描实施方式） 数据驱动电路第 n列红外光 LED驱动信号 T1 (行扫描实施方式） 数据驱动电路第一列红外 LED驱动信号 T1 (列扫描实施方式 )
数据驱动电路第一行可见光 LED驱动信号 P1 (列扫描实施方式） 扫描驱动电路第一行红外 LED驱动信号 Q1 (行扫描实施方式）
扫描驱动电路第一行可见光 LED驱动信号 P1 (行扫描实施方式） 具体实施方式
为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图及实 施例， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实施例仅 仅用以解释本发明， 并不用于限定本发明。
现有的 LED矩阵分别有图 1和图 1A两种， 这两种的控制方式不同， 图 1 是列扫描方式， 图 1A是行扫描方式。但是两者都是一次显示一整列（行） m(n) 个 LED显示单元， 而依次一列 （行）一列 （行）逐列 （行）显示下去共显示 n(m)列 （行） 。 传统的 LED显示单元， 依单色或多色的 LED矩阵， 分别有一 个可见光 LED或一个以上的可见光 LED, 分别如图 2及图 3所显示。 本发明 实施例在显示单元内除一般可见光外，另加了一颗红外光 LED。以单色时为例， 图 4中 11为红外光 LED， 12为一般可见光 LED。 因为本发明实施例对传统的 可见光部分， 并不丈更动。 所加红外线 LED驱动方式以行扫描或列扫描皆可， 两者类 4以， 因此说明时红外线 LED扫描以列扫描为主。
传统 LEb矩阵以列扫描而言如果是每个 LED显示单元有 r个 LED (一般 多色的有 2 ~ 3个不同颜色 LED, 单色则只有一颗） ， 则每列 LED共有 k x r 个 LED, 即 m - kxr。 单色与多色的 LED矩阵除 LED显示单元内的 LED个数 及 色不同， 驱动方式一样， 因此对本发明的说明以单色 LED矩阵为主， 多色 LED矩阵驱动相当于较多数目的单色 LED。 图 1方式 LED矩阵扫描线 Sl~Sn 分别依次供电， 外部数据送到数据驱动电路， 数据驱动电路依据不同的数据值 送出 Pl~Pm的信号来控制 LED矩阵来显示出相关的图案。 图 1为较常见的控 制方式， 图 1A则见于美国专利号 5, 748, 160的设计， 此篇专利中 P l ~ P m 会由扫描驱动电路依次产生不同的阶梯状电压， 以单色的 LED矩阵为例， 先由 P 1开^给电压， 然后 P 2, 然后依序一次一行逐行而下。每次给电压的那一行， 在把外部数据送到数据驱动电路产生不同的 S l ~ S n控制信号，分别点亮同一 行上不同列的 LED产生所需要的图形。
本发明实施例可以分别适用图 1及图 1A的可见光 LED矩阵驱动方式， 因 为本发明实施例是多了红外光的 LED, 所增加的驱动电路为驱动红外光 LED, 而可见光的部分驱动则维持不变。本实施例将以图 1的可见光 LED矩阵驱动方 式为例， 说明如何驱动加上内嵌红外线 LED的 LED矩阵， 如图 5所示。 图 5A 的驱动， 可见光驱动扫描方式由原列扫描改为行扫描， 驱动控制方式与图 5有 所不同。 但图 5A在光笔操作部分实际原理和图 5相同， 只是将行列调换而已。 先以图 1的驱动方式来说明， 图 6是传统列扫描的波形， S1依序于时间 tl 时开始供电， P1及 P2到 Pm—整列电压分别依照使用者输入的外部数据来控 制， 产生第一列的 LED灯的图案。 然后依次 S2依序于时间 t2时开始供电， P1 及 P2到 Pm—整列电压分别依照使用者输入的外部数据来控制，产生第二列的 LED灯的图案。 依序的 S3, S4, ... Sn, 完成一整个画面的扫描。 然后再自 S1 开始逐列扫描下一个画面。 本发明实施例在于可见光 LED, 扫描方式与现有 LED矩阵相同。 但是在多出的红外 LED， 如图 5多出的 k*n个红外 LED, 可 提供 ΤΙ.,Τη及 Ql..Qk的驱动信号， 另外对 LED装置外的光笔提供信号。 以便 让光笔可以计算出目前红外光点所在的行列位置。
图 8提出本发明实施例的列扫描方式，和可见光类似。 红外 LED由 Tl..Tn 逐列扫描， 图 8的 T1 ( 41 )供电区间和 S1 ( 31 ) 的供电类似。 但和可见光的 Pl..Pm ( 42 )同时依外部数据驱动不同， 红外光上 Ql , Q2, ..Qk (图 8中的 32， 33, 34 )是依次一个个点亮， 同一时间内 （ql， q2， ..qn) 不会有一个以上的红 外 LED同时点亮， 点亮的波形可以是静态的供电状态或某个调制频率的波形。 T1供电的周期 tl'和 S1的 tl并不一定要相同， 可以根据 LED矩阵大小及串连 数决定。 如果 tl'等于 tl时， 则 Tl〜Tn可以用 Sl〜Sn—样的波形推动， 如此 LED矩阵的部分可以不用有 Tl~Tn接脚， 直接于 LED矩阵内部将原先接 T1 - Tn处， 接 Sl ~ Sn即可， 如此可以简化本发明实施例系统设计。
图 1 A是行扫描的传统 LED装置， 虽然扫描方式和图 1有极大的差异。 但 是本发明行扫描时在可见光 LED部分，是维持和传统方式不变的。 只是配合外 部数据由一列一列改由一行一行供给， 而红外扫描信号由列扫描改为行扫描， 如图 8A为本发明实施例的行扫描实施方式。 图 7为现有行扫描的驱动方式， 可以看到行驱动信号分别由 PI , P2, 至 Pm， 分别于 tl , t2, ..tm依序送出供电 信号， 而 S1到 Sn则依外部数据同时发出灯亮或灭的信号。 图 8A为本发明实 施例行扫描的驱动方式， 可以看出与图 8列扫描的类似之处， 重点都是扫描红 外线的 LED时， 无论是逐行或逐列扫描， 红外 LED都必须一个个依次点亮如 图 8A中的 32A、 33A、 34A, 不能同时有一颗以上的红外 LED同时点亮， 如 此外部光笔才能判断红外光点位置。 同图 8列扫描时的原理， 若图 8A的 tl'和 tl * r相同时， 可以直接以 Pl~Pm的信号取部分（每 r个取一个， 即取 Qi * r 而 i=l ~k)来推动 Ql~Qk， 如此可以简化系统设计。
图 9 本发明提供给外部光笔的信号， TRIG为外部的光笔感应到红外光 的触发信号。 HS (21 )及 VS (22)为本发明实施例提供给夕卜部光笔的信号。 HS与列 (或行)扫描信号保持同步及周期为固定比率 M, Vs与列 (或行)扫描的 第一列 (或行)供电信号保持同步及周期为固定比率 N。如此以 TRIG触发点上升 沿与 VS上升沿的时间差 tg占 VS周期 tv的比例 Y, 及 TRIG 巨离前一个 HS 的时间 tp与 th的比例 X,就可以得知触发点 TRIG是哪一条扫描线及哪个红外
LED点所触发进而知道目前光笔位置。 详细计算如下：
X = tp/th;
Y = tg/tv;
th = MxtY; (列扫描 tl'参考图 8， 行扫描 tl'参考图 8A)
tv = Nxtl' n; (列扫描时， tl'及 n参考图 8)
tv = Nxtl k; (行扫描时， tl'及 k参考图 8A)
因为 X即触发亮点在同一列 （行） 中的位置， 而 y即那一条扫描列 （行） 的位置， 是与 tl'及 d'x" (tl'xk , 行扫描时）相关。
X = tpltV= tp/(th/M) = Mx(tp/th) = MxX;
y = [tg/(tVxn)) = [tg/(tv/N)] = [N {tg/tv)] = [Nx 7];( (-] . 取整数运算）
y = [tg tVxk)] = [tg /(tv I N)] = [N x (tg /tv)] = [Nx H; (行扫描时 )
依此，外部光笔即可算出光笔于 LED矩阵显示的位置。其中之所以化简用 X， Y, M, N来计算， 是因为 M, N为系统设计时已知的参数。 而 X, Y为 TRIG点与 HS, VS的相对关系， 外部光笔很容易获得内部的频率， 设置成计 数器分别计算 HS， VS, TRIG的宽度， 即可得到。 至于 M, N的值可以为 1 也可以是其它固定数， 以方便外部光笔的系统频率设计。 为了考虑有串接 LED矩阵的需求，我们另外必须增加三个控制信号，如图 10中的 EI ( 24 )及 EO ( 25 )及 FS ( 23 ) 。 FS为 FRAME同步信号与扫描面 周期同步， 如果有 a个 LED矩阵串接， 则 FS的周期 tf为整个扫描面周期 tv' 的 a倍。 即图 10中，
tv'= tYxn (列扫描时， tl'及 n参考图 8 )
tv'^ tl'xk (行扫描时， tl'及 k参考图 8A )
Figure imgf000010_0001
EI是外部红外装置供电输入信号， 而 EO是下一级红外装置的供电输出， EO于系统重置时输出是除能状态。 每当 tv'周期开始且 EI输入也是供电时， 在 这个 tv'周期这个 LED矩阵的红外线 LED部分才会作用。当 EI这个信号在这个 tv '周期开始供电后， EO会在下一个 tv'周期开始时供电， 供下一级串 ^的 LED 矩阵可以于下一个 tv'周期工作。 如此红外光 LED的部分会一个装置一个装置 的逐次工作下去， 一次工作一个 tV周期。 串接的方式如图 11方式， 其中控制 包括图 9中的 HS, VS信号。 而 HS, VS, FS则来自时序电路。 在串接时， 外 部光笔除了需有图 9的 HS, VS信息以计算 th, tv与 tg的比例外， 必须再增加 计算 FS周期 tf与 tg的比例关系， 以推算 TRIG是哪一个串接的 LED矩阵的 VS周期作用时发生。 此外串接时触发点的行列位置计算与不串接时相同。
综合以上所述， 本发明实施例的装置， 以传统的 LED矩阵的显示单元内多 加入红外 LED, 并且于传统的可见光的驱动信号外， 多增加了红外 LED的驱 动信号。使得任何时候红外 LED都不会有一个以上处于供电的状态，再加上本 发明实施例的时序信号另外提供给外界光笔的同步信号 HS、 VS, 可以让外部 光笔计算出红外光触发点的行列位置。 另外在串接时， 本发明也提供了工串接 时使用装置的同步信号 FS,可以让外部光笔计算出哪一个串接的袭置所发出的 红外光点。而串接时使用的外部红外装置供电输入信号 EI及下一级红外装置的 供电输出 EO,依次如图 11串接的结果则使得任何时候的 LED矩阵装置红外线 部分， 只有一个装置是供电的。 因此外部光笔才能依红外 LED触发点与 FS的 位置关系， 计算出是串接中的那个 LED矩阵装置所触发。 与现有的 LED矩阵 相比，本发明提供了原来没有的光笔接口， 并且以内嵌不可见光的红外 LED方 式， 克服了传统冷阴极管屏幕光笔无法于无亮点区感应的缺点。 并且也提供了 串接的信号， 供串接时使用。 具新颖及进步性， 及商业上实用之价值。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发 明的精神和原则之内所作的任何修改、 等同替换和改进等， 均应包括在本发明 的保护范围之内。 工业实用性
本发明实施例的装置， 以传统的 LED矩阵的显示单元内多加入红外 LED， 并且于传统的可见光的驱动信号外， 多增加了红外 LED的驱动信号：使得任何 时候红外 LED都不会有一个以上处于供电的状态，再加上本发明实施例的时序 信号另外提供给外界光笔的同步信号 HS、 VS， 可以让外部光笔计算出红外光 触发点的行列位置。 另外在串接时， 本发明也提供了工串接时使用装置的同步 信号 FS, 可以让外部光笔计算出哪一个串接的装置所发出的红外光点。 而串接 时使用的外部红外装置供电输入信号 EI及下一级红外装置的供电输出 EO, 依 次如图 11 串接的结果则使得任何时候的 LED矩阵装置红外线部分， 只有一个 装置是供电的。 因此外部光笔才能依红外 LED触发点与 FS的位置关系， 计算 出是串接中的那个 LED矩阵装置所触发。 与现有的 LED矩阵相比， 本发明提 供了原来没有的光笔接口， 并且以内嵌不可见光的红外 LED方式，克服了传统 冷阴极管屏幕光笔无法于无亮点区感应的缺点。 并且也提供了串接的信号， 供 率接时使用。 具新颖及进步性， 及商业上实用之价值。

Claims

权利要求
1、 一种 LED矩阵显示装置， 其特征在于包括：
LED矩阵， 包括多个行列交接的显示单元， 每个所述显示单元包括一个红 外 LED及至少一个可见光 LED;
行数据驱动电路，用于接收外部数据并驱动 LED矩阵以产生不同的可见光 LED图案， 并驱动所述红外 LED;
列扫描电路， 包括可见光 LED列扫描电路和红外 LED列扫描电路， 用于 产生驱动所述 LED矩阵的列信号； 以及 1
时序电路， 用于产生供外部光笔使用的信号以及用于列扫描驱动电路和行 数据驱动电路的信号。
2、 如权利要求 1所述的 LED矩阵显示装置， 其特征在于， 所述行数据驱 动电路以静态或固定频率调变方式依次驱动所述 LED矩阵的同一列的所述红 外 LED， 使任一时间不会有一个以上的红外 LED同时被驱动。
3、如权利要求 1所述的 LED矩阵显示装置，其特征在于，所述列红外 LED 列扫描电路依列固定时间逐列驱动所述红外 LED, 使任一时间不会有一列以上 的红外 LED同时皮驱动。
4、 如权利要求 1所述的 LED矩阵显示装置， 其特征在于， 所述时序电路 供外部光笔使用的信号包括：
与扫描列同步的信号， 外部光笔依光点触发点与所迷信号位置计算出光点 行位置；
与扫描列第一列同步的信号， 外部光笔依光点触发点与所述信号位置计算 出光点列位置。
5、 如权利要求 4所述的 LED矩阵显示装置， 其特征在于， 在所述装置串 接使用时所述供外部光笔使用的信号进一步包括：
第一扫描装置同步驱动信号， 外部光笔依光点触发点与所述信号位置计算 出光点装直位置；
外部红外装置驱动输入信号， 用来串接上一级装置的驱动输出；
下一级红外裝置驱动输出信号， 用来供下一级装置驱动输入。
6、 一种 LED矩阵显示装置， 其特征在于包括：
LED矩阵， 包括多个行列交接的显示单元， 每个所迷显示单元包括一个红 外 LED及至少一个可见光 LED;
列数据驱动电路，用来接收外部数据并驱动所迷 LED矩阵以产生不同可见 光 LED图案， 并驱动所述红外 LED;
行扫描电路， 包括可见光 LED行扫描电路和红外 LED行扫描电路， 用于 产生驱动所述 LED矩阵的列信号；
时序电路， 用来产生供外部光笔使用的信号， 及所述行扫描驱动电路和所 迷列数据驱动电路的信号。
7、 如权利要求 6所述的 LED矩阵显示装置， 其特征在于， 所述列数据驱 动电路以静态或固定频率调变方式依次驱动所述 LED矩阵的同一行的所述红 外 LED, 使任一时间不会有一个以上的红外 LED同时被驱动。
8、 如权利要求 6所述的 LED矩阵显示装置， 其特征在于， 所迷红外 LED 行扫描电路依列固定时间逐行驱动红外 LED, 使任一时间不会有一行以上的红 外 LED同时被驱动。
9、 如权利要求 6所述的 LED矩阵显示装置， 其特征在于， 所述时序电路 供外部光笔使用的信号包括：
与扫描行同步之信号， 外部光笔依光点触发点与所述信号位置计算出光点 列位置；
与扫描列第一行同步的信号， 外部光笔依光点触发点与所述信号位置计算 出光点行位置。
10、 如权利要求, 6所述的 LED矩阵显示装置， 其特征在于， 在所述装置串 接使用时所述供外部光笔使用的信号进一步包括： 第一扫:^装置同步驱动的信号， 外部光笔依光点触发点与所述信号位置计 算出光点装置位置；
外部红外装置驱动输入信号， 用来串接上一级装置的驱动输出； 下一级红外装置驱动输出信号， 用来供下一级装置驱动输入。
PCT/CN2008/000033 2007-07-26 2008-01-04 Dispositif d'affichage à matrice de diodes électroluminescentes WO2009012635A1 (fr)

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