Digitizer and method of manufacturing the same
A method of manufacturing a digitizer includes forming a circuit layer that detects an input, forming a magnetic field shielding layer that contains disoriented magnetic powder, disposing an adhesive between the circuit layer and the magnetic field shielding layer, and hot pressing the circuit layer and the magnetic field shielding layer so as to orient the magnetic powder.
1. An electronic device comprising:
a magnetic field sensor configured to detect first input based on a magnetic field;
a display disposed on a top of the magnetic field sensor, wherein the display is configured to display a screen; and
a capacitive sensor layer disposed on a top of the display, wherein the capacitive sensor layer is configured to detect a second input based on a change in a capacitance,
wherein the magnetic field sensor comprises:
a first conductive layers a magnetic field shielding layer formed between the first conductive layer and a first cover layer, wherein the magnetic field shielding layer is configured to reduce an intensity of a magnetic field reaching the first conductive layer, and the first cover layer in contact with the magnetic field shielding layer, and
wherein the magnetic field shielding layer is formed by hot pressing the first cover layer onto the first conductive layer while a mixture of an adhesive resin and a disoriented magnetic powder is disposed between the first cover layer and the first conductive layer, wherein the hot pressing causes the disoriented magnetic powder to be oriented and attaches the first cover layer to the first conductive layer, and wherein the magnetic field shielding layer is the mixture including oriented magnetic powder.
2. The electronic device of claim 1 , wherein the magnetic field further comprises a circuit layer disposed on a top of the first cover layer, wherein the circuit layer comprises:
an insulating layer; and
first and second circuit patterns disposed on opposite sides of the insulating layer.
3. The electronic device of claim 2 , wherein the insulating layer comprises polyimide (PI).
4. The electronic device of claim 2 , wherein the first and second circuit patterns are formed by etching a second conductive layer and a third conductive layer disposed on opposite sides of the insulating layer, respectively.
5. The electronic device of claim 4 , wherein the second conductive layer and the third conductive layer comprise copper.
6. The electronic device of claim 1 , wherein the first conductive layer is a magnesium bracket.
7. The electronic device of claim 1 , wherein the magnetic field sensor further comprises a fourth conductive layer disposed between the first conductive layer and the magnetic field shielding layer.
8. The electronic device of claim 7 , wherein the fourth conductive layer is a film of aluminum or magnesium.
9. The electronic device of claim 2 , wherein the magnetic field sensor further comprises a first adhesive layer disposed between the first cover layer and the circuit layer, wherein the first adhesive layer comprises a pressure sensitive adhesive or a thermosetting adhesive.
10. The electronic device of claim 2 , wherein the magnetic field sensor further comprises a second cover layer disposed on a top of the circuit layer on an opposite side to a side facing towards the first cover layer.
11. The electronic device of claim 10 , wherein the magnetic field sensor further comprises a second adhesive layer disposed between the second cover layer and the circuit layer.