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Liquid crystal device having LEDs of a wide polar lighting angle, the polar angle determining the LEDs spacing
| Details |
Inventors: Hansen, Ingolf G.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Gross; Anita Pellman
Assistant Examiner: Ton; Toan
Attorney, Agent or Firm: Nichols; Daniel K., Scutch, III; Frank M.
A display is provided comprising a semi-transparent display element (16, 17, 18, 19), such as double super twisted nematic (DSTN) liquid crystal display (LCD) cell, a sub-assembly having backlight elements (11, 12, 13) mounted thereon, and mounting means (20) mounting the display element over the sub-assembly with the display element adjacent to the back light elements, with no diffuser between the backlight elements and the display element. The backlight elements are an array of light emitting diodes of sufficiently wide angle and spaced sufficiently close together that, when viewed from the front of the display element, the display has substantially evenly dispersed brightness across the array. |
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DETAILED DESCRIPTION According to the present invention, a display is provided comprising: a semi-transparent display element; a backlight sub-assembly, and mounting means mounting the display element over and directly adjacent to the backlight sub-assembly, wherein the backlight sub-assembly comprises a 2-dimensionaI array of light emitting diodes mounted on a circuit board, characterised in that: there is no diffuser between the light emitting diodes and the display element, the light emitting diodes have a wide polar lighting angle, and the spacing between the light emitting diodes is determined in relation to the polar lighting angle such that overlapping of light from one light emitting diode to another provides the display, when viewed from the front of the display element, with substantially evenly dispersed brightness across the array.
It is preferred that the semi-transparent display element is a transmissive or transflective mode liquid crystal assembly having a front polarizer, a back polarizer and a display cell element and a compensation cell element sandwiched between the front and back polarizers.
In another aspect of the invention, a display according to claim 6 is provided.
The inventor has discovered that a display cell element of double super twisted nematic (DSTN) cell give a degree of diffusion in the cell and thereby obviates the need for a diffuser.
This substantially reduces the profile of the display.
It is therefore preferred that the display cell element and compensation cell clement arc of DSTN cell.
The LCD is preferably negative transmission mode.
It is a further significant problem that an array of LEDs generates a substantial amount of heat.
Moreover, a semitransparent display element such as DSTN cell absorbs light from the LEDs.
This has the effect of heating the LCD glass outside its specified range and if not dissipated, harms glue joints used for assembly of the front and back polarizers.
The problem is made worse by the proximity of the LEDs to the display element
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