Liquid crystal display apparatus having a transparent layer covering a reflective layer
First Claim
1. A liquid crystal display apparatus comprising a first substrate having a first electrode individually provided for each pixel, a second substrate having a second electrode, and a liquid crystal layer sealed between the first and second substrates, for achieving display in each pixel, whereinthe first substrate further comprises a switching element provided for each pixel and a reflective electrode for reflecting light incident from the second substrate side to the liquid crystal layer, the reflective electrode partially covering a pixel region and fanned above and electrically connected to the switching element;
- a transparent electrode made of a transparent conductive material is formed as the first electrode above the reflective electrode with an insulating film therebetween;
the transparent electrode is capacitively coupled to the reflective electrode; and
a voltage supplied from the switching element to the reflective electrode is applied to the transparent electrode via a capacitor formed of the reflective electrode and the first electrode disposed with the insulating film therebetween.
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Accused Products
Abstract
A reflective layer for reflecting light incident from a second substrate side and transmitting through a second electrode made of ITO or the like is formed above a first substrate, a switching element provided for each pixel, and an insulating film covering the switching element, the reflective layer being insulated from the switching element. A first electrode having a work function similar to the second electrode and made of a transparent conductive material such as ITO is formed more proximate to a liquid crystal layer than is the reflective layer and is connected to the switching element. The thickness of the first electrode is set to 100 Å or less or in a range approximately from 750 Å to 1250 Å. Alternatively, the switching element maybe connected to the reflective electrode, the first electrode and the reflective electrode which are formed with an insulating film therebetween may be capacitively coupled, and the first electrode may be driven by the reflective electrode via the capacitor.
48 Citations
24 Claims
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1. A liquid crystal display apparatus comprising a first substrate having a first electrode individually provided for each pixel, a second substrate having a second electrode, and a liquid crystal layer sealed between the first and second substrates, for achieving display in each pixel, wherein
the first substrate further comprises a switching element provided for each pixel and a reflective electrode for reflecting light incident from the second substrate side to the liquid crystal layer, the reflective electrode partially covering a pixel region and fanned above and electrically connected to the switching element; -
a transparent electrode made of a transparent conductive material is formed as the first electrode above the reflective electrode with an insulating film therebetween; the transparent electrode is capacitively coupled to the reflective electrode; and a voltage supplied from the switching element to the reflective electrode is applied to the transparent electrode via a capacitor formed of the reflective electrode and the first electrode disposed with the insulating film therebetween. - View Dependent Claims (2, 3)
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4. A liquid crystal display apparatus comprising a first substrate having a first electrode individually provided for each pixel, a second substrate having a second electrode, and a liquid crystal layer sealed between the first and second substrates, for achieving display in each pixel, wherein
the first substrate further comprises a switching element provided for each pixel and a reflective electrode for reflecting light incident from the second substrate side to the liquid crystal layer, the reflective electrode formed above and electrically connected to the switching element; -
a transparent electrode made of a transparent conductive material is formed as the first electrode above the reflective electrode with an insulating film therebetween; the transparent electrode is capacitively coupled to the reflective electrode; a voltage supplied from the switching element to the reflective electrode is applied to the transparent electrode via a capacitor formed of the reflective electrode and the first electrode disposed with the insulating film therebetween; and a capacitance C1 of a pixel capacitor formed of the first electrode and the second electrode disposed to oppose each other with the liquid crystal layer therebetween and a capacitance C2 of the capacitor formed of the reflective electrode and the first electrode satisfy a condition, C2>
100×
C1. - View Dependent Claims (5, 6, 7, 8)
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9. A liquid crystal display apparatus comprising a first substrate having a first electrode individually provided for each pixel, a second substrate having a second electrode, and a liquid crystal layer sealed between the first and second substrates, for achieving display in each pixel, wherein
the first substrate further comprises a switching element provided for each pixel and a reflective electrode for reflecting light incident from the second substrate side to the liquid crystal layer, the reflective electrode formed above and electrically connected to the switching element; -
a transparent electrode made of a transparent conductive material is formed as the first electrode above the reflective electrode with an insulating film therebetween; the transparent electrode is capacitively coupled to the reflective electrode; a voltage supplied from the switching element to the reflective electrode is applied to the transparent electrode via a capacitor formed of the reflective electrode and the first electrode disposed with the insulating film therebetween; and an area S1 of the first electrode disposed to oppose the second electrode with the liquid crystal layer therebetween and an area S2 of the overlapping portion of the reflective electrode and the first electrode disposed to oppose each other with the insulating film therebetween satisfy a relationship, S2>
0.1×
S1. - View Dependent Claims (10, 11, 12, 13)
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14. A liquid crystal display apparatus comprising a first substrate having a first electrode, a second substrate having a second electrode, and a liquid crystal layer sealed between the first and second substrates, wherein
a reflective layer for reflecting light incident from the second substrate side to the liquid crystal layer is formed as a first electrode above the first substrate; -
a transparent electrode made of a transparent conductive material is formed covering the reflective layer, the thickness of the transparent electrode being in a range from 1 Å
to 100 Å
;a switching element corresponding to each pixel is provided between the reflective layer and the first substrate; the switching element is connected to the reflective layer consisting the first electrode; an insulating film is formed between the reflective layer and the transparent electrode; the transparent electrode is capacitively coupled to the reflective layer via the insulating film; and a voltage supplied from the switching element to the reflective layer is applied to the transparent electrode via a capacitor formed of the reflective layer and the transparent electrode disposed with the insulating film therebetween.
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15. A liquid crystal display apparatus comprising a first substrate having a first electrode, a second substrate having a second electrode, and a liquid crystal layer sealed between the first and second substrates, wherein
a reflective layer for reflecting light incident from the second substrate side to the liquid crystal layer is provided above the first substrate, the first electrode is a transparent electrode made of a transparent conductive metal oxide material and formed to cover the reflective layer, the thickness of the transparent electrode being in a range from 1 Å - to 100 Å
;the second electrode is a transparent electrode made of a transparent conductive metal oxide material. - View Dependent Claims (16, 17, 18, 19, 20)
- to 100 Å
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21. A liquid crystal display apparatus comprising a first substrate having a first electrode, a second substrate having a second electrode, and a liquid crystal layer sealed between the first and second substrates, wherein
a reflective layer for reflecting light incident from the second substrate side to the liquid crystal layer is formed as a first electrode above the first substrate; -
a transparent electrode made of a transparent conductive metal oxide material is formed covering the reflective layer, the thickness of the transparent electrode being in a range from 1 Å
to 100 Å
; andthe second electrode is a transparent electrode made of a transparent conductive metal oxide material. - View Dependent Claims (22, 23, 24)
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Specification