Field Sequential Display Subframe Control for Transparent Mode
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Solution Overview
Problem
Field sequential type image display apparatuses struggle to perform positive, negative, and transparent displays simultaneously within the same screen without complex configurations of display panels and circuits, leading to increased costs and moire issues.
Innovation Solution
A field sequential type image display apparatus with a light source section, a light modulating unit, and an image data converting unit that generates driving image data for subframe periods, allowing for simultaneous positive, negative, and transparent displays by controlling transmittance in the light modulating unit, using a planar lighting device that emits light from a principal surface and is in a turn-off state during transparent subframes and a turn-on state during display color subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple display panels are overlaid to achieve simultaneous positive, negative, and transparent display modes, then display mode versatility is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The display panel is segmented into multiple independently controllable subframes within a single frame period. Each subframe can be set to different transmittance states (transparent, positive display, negative display), allowing versatile display modes to be achieved through temporal segmentation rather than spatial stacking of multiple panels.
Solution Approach 2:
The display utilizes field sequential technique with periodic switching of subframes within each frame period. By periodically changing the transmittance state of the single panel across multiple subframes, the system achieves simultaneous support for positive, negative, and transparent display modes without requiring multiple physical panels to be overlaid.
2Adaptability or versatility
If multiple display panels are overlaid to achieve simultaneous positive, negative, and transparent display modes, then display mode versatility is improved, but moire patterns increase
Solution Approach 1:
Instead of overlaying multiple physical panels that create moire patterns through their periodic structures, the invention segments the single panel's operation into multiple subframes. This temporal segmentation eliminates spatial interference patterns while maintaining the ability to display multiple modes simultaneously within one frame period.
3Illumination intensity
If a light guide plate is used for rear surface lighting, then display brightness is improved, but transparent display capability is reduced
Solution Approach 1:
The backlight unit periodically switches between on and off states across different subframes within each frame period. During transparent subframes, the backlight is turned off to allow background visibility, while during positive display subframes, the backlight is turned on to provide sufficient brightness. This periodic switching enables both transparent display capability and adequate display brightness to be achieved with the same light guide plate structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simultaneous positive, negative, and transparent displays without adding new panels or circuits, reducing moire and cost, and improving display efficiency by optimizing subframe periods and transmittance control.
Implementation Method 1
a light modulating unit as a display panel that transmits light from the light source section
Implementation Method 2
the light source section is a planar lighting device that emits light from a principal surface and irradiates a rear surface of the light modulating unit with the light
Data Source
AI summary
In a field sequential type liquid crystal display apparatus in which each frame period is configured with first to fourth transparent subframe periods and blue, green, white, and blue subframe periods, a backlight unit is driven as follows. Light sources are in a turn-off state in the transparent subframe periods. In a second half of the blue, green, and red subframe periods, each of blue, green, and red light sources is in a turn-on state. In a second half of a white subframe, all light sources are in the turn-on state. Driving image data that corresponds to such a configuration of the frame period is generated from input image data, and a liquid crystal panel is driven based on the driving image data.