Instrument Panel Liquid Crystal Display Edge Light Positioning
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Solution Overview
Problem
The design of liquid crystal display devices with edge light backlights, where the light source is placed on one side surface, restricts the uniform placement of pointer-type instruments due to dimensional constraints, leading to reduced design flexibility and increased clearance requirements.
Innovation Solution
The instrument incorporates a liquid crystal display device with a light source on one side, a case with reference positioning pins and holes, and a specific region layout that allows the liquid crystal display to be positioned close to the pointer-type instruments, reducing clearance and enhancing design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light source is disposed on one side surface of the liquid crystal display element, then the liquid crystal display device can be compact, but the pointer-type instruments cannot be located uniformly close to the liquid crystal display element
Solution Approach 1:
The patent applies asymmetry by positioning the reference hole closer to one edge of the case rather than at the center, and by placing the light source on only one side surface of the liquid crystal display element. This asymmetric configuration allows the liquid crystal display device to maintain a compact form while still enabling uniform placement of pointer-type instruments around it, resolving the contradiction between compact size and design flexibility.
2Reliability
If the opening of the case is formed with clearance for dimensional errors, then manufacturing reliability is improved, but the liquid crystal display element cannot be arranged close to the pointer-type instrument
Solution Approach 1:
The patent introduces positioning pins as intermediary elements between the case opening and the liquid crystal display device. These positioning pins fit into corresponding holes to provide precise location reference, allowing the liquid crystal display element to be arranged close to the pointer-type instruments while still accommodating dimensional errors through the tolerance-built positioning mechanism.
3Volume of moving object
If the liquid crystal display device is made small in size, then the overall instrument compactness is improved, but the light source placement is restricted to edge light configuration
Solution Approach 1:
The patent transitions from conventional backlight configurations to an edge light configuration where the light source is placed on the side surface of the liquid crystal display element rather than behind it. This dimensional change in light source placement allows the liquid crystal display device to maintain a small size while still providing adequate illumination, and the asymmetric positioning of the light source on one side surface enables flexible integration with pointer-type instruments.
Data Source
AI summary
An instrument includes: a liquid-crystal display device including a display element and light sources provided along one side surface extending in the Y direction of the element; a first case having a reference positioning pin, and other positioning pins; and a second case having a reference hole into which the reference positioning pin is inserted, other holes into which the other positioning pins are inserted, a first region in which a first pointer-type instrument is provided, a second region in which a second pointer-type instrument is provided, and a third region in which the liquid crystal display device is provided between the first region and the second region. The third region has an edge corresponding to the position where the side surface 4a is disposed, and the reference hole is provided on the edge side with respect to the center of the third region in the X direction.