1. Technical Field
The disclosure generally relates to an electronic blackboard, and particularly to a light emitting diode blackboard which can provide a number of colors for the written words/marks and whose brightness is automatically adjustable according to the environmental brightness.
2. Description of Related Art
In a traditional blackboard, a lot of dust is generated when writing words/marks on or erasing words/marks from the traditional blackboard. The dust not only pollutes the environments, but also is harmful to the user.
What is needed, therefore, is a light emitting diode (LED) blackboard to overcome the above described disadvantages.
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Embodiments of a light emitting diode blackboard will now be described in detail below and with reference to the drawings.
Referring to
Each of the pixels 10 includes a first light source 11, a second light source 12, a third light source 13 and a light detecting device 14. The first light source 12 emits red light, the second light source 13 emits green light and the third light source 14 emits blue light. The light detecting device 14 receives light from the lighting pen 120 and controls lighting of the first light source 11, the second light source 12 and the third light source 13. After the light detecting device 14 receives the light from the lighting pen 120, the light detecting device 14 generates a control signal to the driving device 110. The driving device 110 turns on the first light source 11, the second light source 12 or the third light source 13 according to the control signal. For example, when the light detecting device 14 receives red light, the driving device will turn on the first light source 11 to emit red light; when the light detecting device 14 receives green light, the driving device 110 will turn on the second light source 12 to emit green light; when the light detecting device 14 receives blue light, the driving device 110 will turn on the third light source 13 to emit blue light. In addition, according to the color of light received by the light detecting device 14, the driving device 110 can selectively turn on at least one of the first light source 11, the second light source 12 and the third light source 13. For example, when the light detecting device 14 receives a white light, the driving device 110 will turn on all of the first light source 11, the second light source 12, and the third light source 13 to emit a white light. In this embodiment, the lighting pen 120 acts as a writing instrument for the LED blackboard 100.
When the lighting pen 120 moves on the LED blackboard 100, the pixels 10 on the track of the movement of the lighting pen 120 will emit light. Therefore, the track will be illustrated on the LED blackboard 100 to form the written words/marks. It means that a user can write or draw on the LED blackboard 100. In addition, by using the first light source 11, the second light source 12, and the third light source 13, the track can be illustrated in multiple colors.
Referring to
As described above, the LED blackboard 100 (200) shows the written words/marks according to the track of the lighting pen 120 thereon. No dust is generated in the writing process. In addition, the pixels 10 includes the first light source 11, the second light source 12 and the third light source 13 emitting light with different colors. Therefore the track can be illustrated in multiple colors. Moreover, since the lighting intensity of the pixels 10 is capable of being automatically adjusted according to the lighting intensity of the environment, the lighting of the pixels 10 can be more clearly seen without a manual adjustment of the brightness of the LED blackboard 100 (200) which sometimes is inconvenient and laborious.
It is to be further understood that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
---|---|---|---|
101140055 | Oct 2012 | TW | national |