JP2007133698A - Portable terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure, in a portable terminal for performing feedback to an input operation to a touch panel, the feedback in a further easy-to-understand manner for a user while suppressing an increase in cost. <P>SOLUTION: A light emitting part 12 having a plurality of LEDs 14 and a panel driving part 13 are provided on the lower surface side of a touch panel part 11. When a touch operation is performed to the touch panel part 11, each LED 14 substantially corresponding to the touch position (pressing position) is emission-controlled, and the panel driving part 13 is also vibration-controlled as occasion demands. When a scroll operation is performed to the touch panel part 11, each LED 14 substantially corresponding to the trace of the scroll operation is emission-controlled, and the panel driving part 13 is also vibration-controlled as occasion demands. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile terminal that can be operated by a user, such as a mobile phone terminal.

  Conventionally, an input method using a key has been the mainstream as a user instruction input method in a mobile phone terminal.

  Also, recent mobile phone terminals use, for example, e-mail creation and transmission / reception functions, television broadcast and radio broadcast reception functions, schedule management functions, camera functions, infrared rays, etc., in addition to general call functions. A variety of functions such as data transmission / reception functions and electronic wallet functions are installed, and an input method using a so-called touch panel has been developed as a method for users to input complex operations to execute these various functions. Has been. However, the input method using the touch panel has a problem that it is difficult for the user to confirm whether the input operation to the touch panel is recognized on the terminal side.

  On the other hand, Japanese Patent Application Laid-Open No. 2005-149405 (Patent Document 1) includes a touch panel and a drive unit that vibrates the touch panel, and when pressing on the surface of the touch panel is detected, is confirmed from the start of the pressing operation. An input device is disclosed that performs control to measure the time until the time drive unit vibrates the touch panel according to the length of the time. According to the input device described in this publication, when the operator operates the touch panel, a force sense (click feeling) corresponding to the operation method can be returned to the operator. That is, in the input device described in this publication, it is possible to feed back to the operator whether or not the input operation is recognized on the device side by vibrating the touch panel according to the time of the pressing operation.

Japanese Patent Laying-Open No. 2005-149405 (FIG. 3)

  As described above, the input method using the touch panel has a problem that it is difficult for the user to confirm whether or not the input operation is recognized on the terminal side. However, the input method described in JP-A-2005-149405 described above. According to the input device, it is possible to tactilely feed back to the user whether or not the input operation has been recognized on the terminal side.

  By the way, there are various senses for human beings to obtain information from the outside world, such as sight, hearing, and touch. Among them, it is known that a particularly large proportion is sight. Therefore, for example, in the input method using the touch panel described above, if visual feedback can be performed according to the input operation to the touch panel, the user is more informed whether the input operation has been recognized on the terminal side. It becomes easy to understand and can be surely notified.

  As an example of a technique for providing visual feedback for an input operation on the touch panel, a technique for providing a liquid crystal panel under the touch panel and controlling the screen display of the liquid crystal panel according to the input operation on the touch panel. However, the installation of a new liquid crystal panel causes a significant increase in terminal costs. In addition, the liquid crystal panel is weak against external force such as pressing, and the display is often disturbed by pressing the panel surface. In the worst case, the liquid crystal panel may be damaged. Although it is conceivable to provide a high-strength transparent protective member on the front surface of the liquid crystal panel, in that case, a further increase in cost is inevitable.

  The present invention has been proposed in view of such a situation, and in a mobile terminal that adopts an input method using a touch panel and performs feedback for an input operation to the touch panel, while suppressing an increase in cost, a user can It is an object of the present invention to provide a portable terminal that can provide more reliable and reliable feedback.

  The portable terminal of the present invention includes a panel input unit that performs input by a pressing operation on the surface of the panel, a plurality of light emitting elements, a light emitting unit that is disposed on the lower surface side of the panel of the panel input unit, and a panel input unit. By having a panel drive unit for vibrating and a control unit that performs light emission control of the light emitting unit and vibration control of the panel drive unit based on an input signal from the panel input unit, the above-described problems are solved.

  That is, according to the present invention, in response to a pressing operation to the panel input unit, the light emitting unit emits light, or the panel driving unit vibrates the panel input unit, thereby providing input feedback to the user. Has been made.

  According to the present invention, the light emission control of the light emission unit and the vibration control of the panel drive unit are performed according to the input by the pressing operation to the panel input unit, thereby suppressing the increase in cost and making it easier for the user to understand. In addition, reliable feedback can be performed.

  Hereinafter, an embodiment of a portable terminal of the present invention will be described with reference to the drawings.

  In the present embodiment, a mobile phone terminal is cited as an example of the mobile terminal of the present invention. Of course, the content described here is merely an example, and it goes without saying that the present invention is not limited to this example. .

[Appearance of mobile phone terminal]
FIG. 1 shows a schematic external view of a mobile phone terminal 1 according to an embodiment of the present invention.

  The mobile phone terminal 1 of the present embodiment is a so-called foldable terminal, and a first housing 2 and a second housing 3 are rotatably connected via a hinge portion 5. In the present embodiment, a foldable mobile phone terminal is taken as an example, but the present invention may be other various types of mobile phone terminals such as a straight type and a slide type.

  The first housing 2 is provided with a display 4 made of a liquid crystal device and the like, a receiving speaker 6 and the like. Although illustration is omitted, a camera, a photographing auxiliary light emitting unit, a sub display, a speaker for a ring tone, and the like are arranged on the rear side of the casing with respect to the casing surface on which the display 4 is provided.

  The second housing 3 contains a main circuit configuration and a detachable battery. The second housing 3 corresponds to the surface of the first housing 2 on which the display 4 is provided when the terminal is folded (the surface of the first housing 2 when the terminal is opened). On the same side as the display 4), a microphone 7 for transmission and an operation input unit 10 are provided.

[Configuration of operation input section]
Hereinafter, the configuration of the operation input unit 10 provided in the second housing 3 will be described with reference to FIGS. 2 shows a schematic external perspective view in which only the operation input unit 10 is extracted, and FIG. 3 shows a lattice-shaped light shielding partition member 15 and an LED (light emitting diode) 14 arranged inside the operation input unit 10. FIG. 4 is a schematic external perspective view, and FIG. 4 is a schematic exploded perspective view of the operation input unit 10.

  The operation input unit 10 includes a touch panel unit 11, a light emitting unit 12 disposed below the touch panel unit 11 (inside the housing), and a panel disposed below the light emitting unit 12 (inside the housing). And a drive unit 13.

  The light emitting unit 12 includes a plurality of LEDs (light emitting diodes) 14 disposed on the lower surface side of the touch panel unit 11 and a light guide member for guiding light from the LEDs 14 to the outside of the housing of the second housing 3. 16 and a light shielding partition member 15 for preventing light from each LED 14 from leaking to another adjacent LED side and going out to the outside of the housing of the second housing 3. It is configured. In the example of this embodiment, the plurality of LEDs 14 are arranged in accordance with, for example, a key arrangement of a general mobile phone terminal. Moreover, the shape of the light shielding partition member 15 is, for example, a lattice shape matched to the LEDs 14.

  The touch panel unit 11 is composed of a transparent or translucent member. When a pressing force from the outside is detected, the touch panel unit 11 generates a voltage value corresponding to the pressing force, and further converts the voltage value to A / D (analog / digital). ) A sensor unit that converts and outputs digital data, and a position determination processing unit that obtains a position where the pressing force is detected by the sensor unit and generates two-dimensional coordinate data (that is, input position data) representing the pressed position. I have. In addition, on the outer surface of the touch panel unit 11, the same numbers as those depicted on the key tops of the keys arranged in a general mobile phone terminal, for example, at positions corresponding to the arrangement of the LEDs 14 Characters, symbols, etc. may be drawn.

  The panel drive unit 13 is arranged on the lower surface side of the touch panel unit 11, for example, and is configured by a vibration device for vibrating the operation input unit 10 from below. As an example, the vibration device includes a vibrator having a weight at a position eccentric with respect to the motor rotation shaft, and generates vibration by the rotation of the motor. In addition, the vibration device may be a device in which a plurality of piezoelectric elements such as piezoelectric ceramics are arranged at a plurality of positions respectively corresponding to the plurality of LEDs 14 and each of the piezoelectric elements can be individually vibrated. 2 and 4, an example in which the panel driving unit 13 is a device having substantially the same area as the light emitting unit 12 has been described. However, the panel driving unit 13 according to the present embodiment includes the operation input unit 10. If it can be vibrated, it may be smaller.

  In the cellular phone terminal 1 according to the present embodiment having the operation input unit 10 configured as described above, when a desired position on the operation input unit 10 is touched by a user's finger or the like, the touch panel unit 11 A sensor part detects the pressing force at the time of the said touch operation, and the position determination part of the said touch panel part 11 determines the pressing position at the time of the said touch operation. Then, the digital data representing the pressing force at the time of the touch operation and the two-dimensional coordinate data representing the pressing position are sent to the internal CPU of the mobile phone terminal 1. The internal CPU at this time performs light emission control of the plurality of LEDs 14 of the light emitting unit 12 based on the data of the pressing force and the pressing position. That is, the internal CPU, for example, lights an LED arranged at a location corresponding to the pressing position of the touch operation with a brightness according to the pressing force, or lights with a brightness according to the pressing time, Light emission control is performed such that the light emission pattern blinks in accordance with the pressing force and the pressing time. Here, as the light emission control of the brightness according to the pressing force, for example, there is a control that emits light strongly when the pressing force is large and emits light weakly when the pressing force is small. Further, as the light emission control of brightness according to the pressing time, for example, there is a control that emits light strongly when the pressing time is long and weakly emits light when the pressing time is short. Further, as the light emission control of the light emission pattern according to the pressing force, for example, a control of blinking quickly when the pressing force is large and blinking slowly when the pressing force is small can be given. Moreover, as light emission control of the light emission pattern according to pressing time, control which blinks quickly when the pressing time is long and blinks slowly when the pressing time is short can be mentioned, for example. These light emission controls make it possible for the user to recognize the pressing force and the pressing time. As an example of the light emission pattern control, not only the blinking speed change control but also the blinking rhythm change control may be used.

  In the mobile phone terminal 1 of the present embodiment, when the user moves the operation input unit 10 while touching with a finger or the like, that is, when the user performs a scroll operation, the sensor of the touch panel unit 11 The unit detects the pressing force generated by the scroll operation, and the position determination unit of the touch panel unit 11 calculates the direction and distance of the scroll operation. Then, digital data representing the pressing force of the scroll operation and two-dimensional coordinate data representing the direction and distance of the scroll operation are sent to the internal CPU. The internal CPU at this time performs light emission control of the plurality of LEDs 14 of the light emitting unit 12 based on the data. That is, for example, the internal CPU sequentially turns on the LEDs arranged on the locus of movement of the user's finger or the like by the scroll operation with the brightness or the light emission pattern according to the pressing force, or unit time by the scroll operation. The speed of the scroll operation is obtained from the hit movement distance, and the light emission control is performed such that each LED arranged on the locus where the user's finger or the like has moved by the scroll operation blinks with the brightness or the light emission pattern corresponding to the speed. . Here, as the light emission control of the brightness according to the pressing force at the time of the scroll operation, for example, when the pressing force is large, each LED is sequentially made to emit light strongly and blink quickly, and when it is small, light is emitted weakly or blinks slowly. Control. In addition, the light emission control according to the speed of the scroll operation includes, for example, a control that causes each LED to emit strong light or blink quickly when the speed is fast, and weakly emit light or blink slowly when it is slow. Can do. Also in this example, as a light emission pattern control example, not only the blinking speed change control but also the blinking rhythm change control may be used.

  In addition, the internal CPU of the mobile phone terminal 1 according to the present embodiment is configured such that when a desired position on the operation input unit 10 is touch-operated by a user's finger or the like, the pressing force and the pressing position from the touch panel unit 11 are Based on the pressing time data, the vibration control of the panel driving unit 13 can be performed. That is, for example, when the touch operation is performed, the internal CPU vibrates the panel drive unit 13 with a strength corresponding to the pressing force or the pressing time, or the vibration pattern according to the pressing position or the pressing time. Control to vibrate the drive unit 13 is performed. In the case where the panel driving unit 13 is configured by the plurality of piezoelectric elements, the internal CPU applies the piezoelectric element disposed at a location corresponding to the pressing position with a strength corresponding to the pressing force and pressing time. Vibration control is performed to vibrate or vibrate a piezoelectric element arranged at a location corresponding to the pressing position with a vibration pattern corresponding to the pressing force or pressing time.

  Further, the internal CPU of the mobile phone terminal 1 of the present embodiment, when the user performs a scroll operation on the operation input unit 10, drives the panel based on each data representing the pressing force, direction, and distance of the scroll operation. It is also possible to perform vibration control of the unit 13. That is, for example, when the scroll operation is performed, the internal CPU controls the panel drive unit 13 to vibrate, or controls the panel drive unit 13 to vibrate with a vibration pattern according to the pressing force and speed during the scroll operation. Do. When the panel drive unit 13 is composed of the plurality of piezoelectric elements, the internal CPU sequentially vibrates each piezoelectric element arranged in the scroll operation locus with a strength according to the pressing force, Vibration control is performed such that each piezoelectric element is vibrated with a vibration pattern corresponding to the speed at the time of scroll operation.

  In the present embodiment, both the light emission control of each LED 14 and the vibration control of the panel drive unit 13 may be performed simultaneously, or only one of them may be performed. Further, in the mobile phone terminal 1 of the present embodiment, the user can arbitrarily select which one to perform.

[Internal configuration of mobile phone terminal]
FIG. 5 shows a schematic internal circuit configuration of the mobile phone terminal of the mobile phone terminal 1 of the present embodiment described above.

  In FIG. 5, a data line is a transmission line for transmitting various data such as voice data, e-mail data, and image data.

  The control line is a transmission line for transmitting various control information such as control data from the control unit 30 configured by a CPU (Central Processing Unit).

  The antenna 32 is a built-in antenna, for example, and is connected to the communication circuit 31 and used to transmit and receive signal radio waves.

  The communication circuit 31 performs frequency conversion, modulation, demodulation, and the like of transmission / reception signals.

  The call voice data received by the antenna 32 and the communication circuit 31 is sent to the voice processing unit 42, and the other received data is sent to the control unit 30 and appropriately processed. Sent from the control unit 30 to each unit. The received data other than the call voice is data related to packet communication. For example, e-mail data, moving image or still image data, music data, HTML (Hyper Text Markup Language) data, program code data, etc. Etc.

  When the call voice data is supplied from the antenna 32 and the communication circuit 31, the voice processing unit 42 decodes the call voice data, converts the decoded call voice data into an analog voice signal, and outputs the analog voice. A signal is sent to the speaker 40 or an earphone jack (not shown).

  The speaker 40 corresponds to the reception speaker 6 of FIG. 1, amplifies the supplied analog audio signal with an internal amplifier, converts the audio signal into audible audio, and outputs the audio signal to the outside. Thereby, the call voice is output from the speaker 40.

  The microphone 41 corresponds to the transmitting microphone 7 of FIG. 1, converts input sound into an analog sound signal, amplifies it with an internal amplifier, and sends the analog sound signal to the sound processing unit 42.

  When the call voice signal is supplied from the microphone 41, the voice processing unit 42 converts the call voice signal into digital voice data, encodes it, and sends the encoded call voice data to the communication circuit 31. As a result, a call voice signal is transmitted from the antenna 32.

  The display unit 33 corresponds to the display 4 in FIG. 1 and includes a display device such as a liquid crystal display and a display driving circuit, and displays images, characters, and the like on the screen of the display.

  The image processing unit 43 performs decompression decoding on the compressed and encoded image data read from the built-in memory under the control of the control unit 30 and displays the decompressed decoded image data via the data line. Send to part 33. The image processing unit 43 performs compression encoding of still image and moving image data captured by a camera unit (not shown), and stores the compression encoded image data under the control of the control unit 30. Send to memory for storage.

  The touch panel unit 34 corresponds to the touch panel unit 11 of the operation input unit 10 described above, and includes a voltage value detection unit 34a that converts an external pressing force into a voltage value, and a voltage value detected by the voltage value detection unit 34a. The above-described position determination process for generating two-dimensional coordinate data representing the pressed position based on the above-described sensor unit comprising the A / D conversion unit 34b for A / D converting the data and the data from the A / D conversion unit 34b And an input position detection unit 34c. Then, the input position detection unit 34c sends the data of the pressing force and the pressing position to the control unit 30 which is an internal CPU.

  The panel drive unit 35 corresponds to the panel drive unit 13 described above, and is configured by a vibration device for vibrating the operation input unit 10 from below. The panel drive unit 35 vibrates under the control of the control unit 30 that is an internal CPU.

  The LED driving unit 44 and the LED 45 correspond to the light emitting unit 12 described above, and the LED 45 corresponds to the plurality of LEDs 14 described above. The LED driving unit 44 causes the LED 45 to emit light under the control of the control unit 30.

  The memory unit 36 includes a ROM (Read Only Memory) and a RAM (Random Access Memory). The ROM is an OS (Operating System), a control program for the control unit 30 to control each unit, various initial setting values, font data, dictionary data, ringtones, key operation sounds, various sound data for alarm sounds, Based on the data from the touch panel unit 34, a control application program for performing the above-described light emission control and vibration control, an application program for creating and editing an e-mail, and various processes for images and sounds Application programs for various applications installed in a mobile phone terminal, identification information (ID) of the mobile phone terminal, and the like are stored. The ROM includes a rewritable ROM such as a NAND-type flash memory (NAND-type flash memory) or an EEPROM (Electrically Erasable Programmable Read-Only Memory), and stores e-mail data, a telephone number, an e-mail address, and the like. Phonebook data (address book) data to be stored, schedule book data, still image and moving image data, sound data for key operation sounds, alarm sounds, etc., character data, prediction conversion candidate word registration data, and prediction conversion data It is also possible to save learning data and other various user setting values. The RAM stores data as needed as a work area when the control unit 30 performs various data processing.

  The control unit 30 is the above-described internal CPU, and controls the cellular phone terminal based on the OS and various programs stored in the memory unit 36 and stores the data such as the pressing force and the pressing position according to the above-described embodiment. Based on the execution of light emission control and vibration control and various calculations.

  In addition, although illustration and description are omitted, the mobile phone terminal of the present embodiment includes a clock unit that measures date and time, a camera unit, a GPS unit, a short-range wireless communication unit such as non-contact communication, a battery, and a power management IC. Various types of configurations included in the conventional mobile phone terminal are also provided.

[Processing flow of the controller that controls light emission and drive]
FIG. 6 shows a flowchart of light emission control and drive control performed by the CPU 30 based on the touch panel output described above.

  In FIG. 6, when the CPU 30 acquires data such as a pressing force and a pressing position from the touch panel unit 34 in step S <b> 1, the process proceeds to step S <b> 2, and a touch operation or a scroll operation is performed by the user from these data. It is determined. That is, for example, the CPU 30 determines that the touch operation is performed when the pressed positions are substantially the same, and determines that the operation is a scroll operation when the position changes in the pressed state.

  Next, when the CPU 30 determines that the touch operation is performed in step S2, when the LED light emission control is performed, as a process in step S3, the LED light emission control signal for performing the light emission control according to the touch operation. And sends the control signal to the LED drive unit 44. As a result, the LED 45 is driven to emit light as described above. When performing panel driving, the CPU 30 generates a panel driving control signal for performing vibration control according to the touch operation, and sends the control signal to the panel driving unit 35. Thereby, the panel drive unit 35 is driven to vibrate as described above.

  On the other hand, when the CPU 30 determines that the scroll operation is performed in step S2, when the LED light emission control is performed, an LED light emission control signal for performing the light emission control corresponding to the scroll operation is performed as a process in step S4. The control signal is generated and sent to the LED drive unit 44. As a result, the LED 45 is driven to emit light as described above. When panel driving is performed, the CPU 30 generates a panel driving control signal for performing vibration control according to the scroll operation, and sends the control signal to the panel driving unit 35. Thereby, the panel drive unit 35 is driven to vibrate as described above.

[Summary]
As described above, according to the mobile phone terminal 1 of the present embodiment, since the touch panel unit 11 (34) is provided, the user can perform complicated operations that cannot be handled by conventional key input.

  In addition, according to the mobile phone terminal 1 of the present embodiment, user operation input such as touch operation or scroll operation on the touch panel unit 11 can be visually fed back to the user by the LED light emission control of the light emitting unit 12. Further, the user operation input to the operation input unit 10 can be tactilely fed back to the user by vibration control of the panel drive unit 13 (35). That is, according to the mobile phone terminal 1 of the present embodiment, it is possible to inform the user whether the input operation has been recognized on the terminal side visually or tactilely. Further, according to the mobile phone terminal 1 of the present embodiment, the position of the input operation (pressing position), the strength of the input operation (pressing force), the time of the input operation (pressing time), the locus of the input operation (scrolling operation locus) ) And the like according to input patterns (that is, different click feelings, for example), the user can check the input operation performed by the user.

  Moreover, in the mobile phone terminal 1 of the present embodiment, since the light-shielding partition member 15 is provided in the light emitting unit 12, when any LED emits light, the light leaks to another adjacent LED side. Therefore, only the operation input position of the user can be emitted.

  The above description of the embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made according to the design or the like as long as the technical idea according to the present invention is not deviated.

  For example, the mobile terminal of the present invention is not limited to a mobile phone terminal, and can be applied to various mobile terminals such as a PDA.

  Further, in the present embodiment, an example in which an application for causing an LED to emit light or vibrate according to a pressed position on the touch panel unit 11 has been described. An application for an electronic game that touches a position corresponding to the location of the light emitting LED may be mounted.

1 is a schematic external perspective view of a mobile phone terminal according to an embodiment of the present invention. It is the outline appearance perspective view which extracted only the operation input part. FIG. 2 is a schematic external perspective view of a grid-shaped light shielding partition member and LEDs arranged inside an operation input unit. The schematic exploded perspective view of the operation input part is shown. It is a block diagram which shows the schematic internal structure of the principal part of the mobile telephone terminal of this invention embodiment. It is a flowchart of the light emission control and drive control which CPU performs based on a touch-panel part output.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Cellular phone terminal, 2 1st housing | casing, 2nd housing | casing, 4 Display, 5 Hinge part, 6,40 Speaker for reception, 7,41 Microphone for transmission, 10 Operation input part, 11, 34 touch panel unit, 12 light emitting unit, 13, 35 panel drive unit, 14, 45 LED, 15 light shielding partition member, 16 light guide member, 30 control unit, 31 communication circuit, 32 communication antenna, 33 display unit, 34a voltage Value detection unit, 34b A / D conversion unit, 34c Input position detection unit, 36 Memory unit, 42 Audio processing unit, 43 Image processing unit, 44 LED drive unit

Claims (8)

A panel input unit where input is performed by a pressing operation on the surface of the panel;
A plurality of light emitting elements, and a light emitting unit disposed on a lower surface side of the panel of the panel input unit;
A panel drive unit for vibrating the panel input unit;
A control unit that performs light emission control of the light emitting unit and vibration control of the panel driving unit based on an input signal from the panel input unit;
A portable terminal characterized by comprising: The mobile terminal according to claim 1,
The said control part performs control which light-emits the light emitting element of the place substantially corresponding to the press position of the said panel input part among the said several light emitting elements of the said light emission part, The portable terminal characterized by the above-mentioned. The mobile terminal according to claim 2,
The mobile terminal according to claim 1, wherein the control unit controls the light emitting element to emit light with a light emission pattern corresponding to at least one of a pressing force, a pressing position, and a pressing time of the panel input unit. The mobile terminal according to claim 1,
The portable terminal characterized in that the control unit performs control to sequentially emit each light emitting element at a location substantially corresponding to the pressing locus of the panel input unit among the plurality of light emitting elements of the light emitting unit. The mobile terminal according to claim 4,
The mobile terminal according to claim 1, wherein the control unit performs control to sequentially emit the light emitting elements with a light emission pattern corresponding to a pressing force of the panel input unit. The mobile terminal according to claim 1,
The mobile terminal according to claim 1, wherein the control unit performs control to vibrate the panel driving unit according to at least one of a pressing force, a pressing position, a pressing time, and a pressing locus of the panel input unit. The mobile terminal according to claim 6,
The portable terminal, wherein the control unit performs control to vibrate the panel driving unit with a vibration pattern corresponding to at least one of a pressing force, a pressing position, a pressing time, and a pressing locus of the panel input unit. The mobile terminal according to claim 1,
The light emitting unit includes a light shielding partition member that blocks light from each light emitting element toward another adjacent light emitting element.

Images