1. Field
The following description relates generally to a light emitting device and a display device using the same.
2. Description of the Related Art
Among light emitting devices, there are light emitting devices using field emission principles. Among various types of light emitting devices using field emission principles, one light emitting device includes a front substrate provided with a phosphor layer and an anode electrode, and a rear substrate provided with electron emitting regions and driving electrodes. Here, the front substrate and the rear substrate are combined along their edges into one body using a sealing member, and then an inner space is evacuated to form a vacuum chamber together with the sealing member.
The driving electrodes include cathode electrodes and gate electrodes formed spaced apart from the cathode electrodes and extending along a direction crossing (e.g., intersecting) the cathode electrodes. Openings are formed on the gate electrodes at crossing regions of the cathode electrodes and the gate electrodes, and the electron emission regions are disposed on the cathode electrodes and spaced apart from the gate electrodes.
When a set or predetermined driving voltage is applied to one of the cathode electrodes and a corresponding gate electrode of the gate electrodes, a voltage difference between the two electrodes creates an electric field in a corresponding electron emission region such that the electron emission region emits electrons. The emitted electrons are drawn to a higher voltage applied to the anode electrode and collide with and excite the phosphor layer, and this causes the phosphor layer to emit visible light.
In order to effectively minimize divergence of an electron beam emitted from the electron emission region spaced apart from the gate electrode, a structure is used in which a groove is formed in the rear substrate, and the cathode electrode and the electron emission region are disposed inside the groove of the rear substrate.
However, such a structure has a problem in that it is difficult to accurately fix the gate electrode to be at a position where the openings correspond to the electron emission region. Furthermore, if the gate electrode is not stably fixed, noise may occur due to vibration at a driving frequency and luminance may be non-uniform due to variation in height of the openings.
The above information disclosed in this Background section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.