Backlight Turn-On Timing for Liquid Crystal Lightness Uniformity
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Solution Overview
Problem
The lightness displayed by a liquid crystal panel is not uniform due to differences in the manufacturing processes of light-emitting elements in the backlight module, causing inconsistent transmittance response between the liquid crystal panel and glasses, leading to non-uniform lightness transmission through the glasses.
Innovation Solution
A lightness adjusting method and system that synchronizes the turn-on times of light-emitting elements in the backlight module with the driving signals for the liquid crystal panel and glasses, using a control circuit to adjust the turn-on times of each light-emitting element to ensure equal transmittance and lightness across all blocks of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the liquid crystal glasses are turned on synchronously with the writing of the liquid crystal panel driving signal and the turn-on of the backlight module, then the system operation is simplified, but the lightness uniformity deteriorates due to inconsistent transmittance response
Solution Approach 1:
The patent applies preliminary action by turning on the backlight module before turning on the liquid crystal glasses. Specifically, the control circuit controls the backlight module to be turned on before controlling the liquid crystal glasses to be turned on. This preliminary activation of the backlight allows the liquid crystal panel to reach a stable transmittance state before the glasses are activated, ensuring uniform lightness while maintaining simplified synchronous control operation.
2Stability of the object's composition
If the liquid crystal panel and glasses are driven for a certain time to output stable transmittance, then the transmittance stability is improved, but the response time is increased
Solution Approach 1:
The patent resolves this contradiction by performing preliminary action - activating the backlight module before the liquid crystal glasses. This sequencing allows the liquid crystal panel to undergo its transmittance stabilization process during the backlight's initial operation period, so that by the time the glasses are turned on, the panel has already reached stable transmittance. This eliminates the need for additional waiting time after glass activation, thus maintaining fast response while ensuring transmittance stability.
Solution Approach 2:
The patent employs periodic action through controlled turn-on and turn-off sequences of the backlight module and liquid crystal glasses. By establishing a specific temporal pattern where the backlight activates first, followed by the glasses after a predetermined interval, the system achieves stable transmittance output without excessive response time. This periodic control pattern can be repeated for each display frame, ensuring consistent performance.
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
This method achieves uniform lightness transmission through the glasses by ensuring the product of transmittance and average lightness of each block is equal, stabilizing the display panel's transmittance and resulting in consistent lightness across all blocks.
Implementation Method 1
the liquid crystal panel and liquid crystal glasses need to be driven for a certain time to output stable transmittance due to physical properties of liquid crystal
Implementation Method 2
The backlight module is composed of a plurality of light-emitting elements arranged in a certain way, the light-emitting elements are used to lighten the blocks of the liquid crystal panel
Data Source
AI summary
The present application relates to a lightness adjusting method for a display system. The method includes the steps of: writing a first driving signal into a display panel; controlling a first lens and a backlight module to be turned on simultaneously, where a plurality of light-emitting elements of the backlight module are turned on simultaneously, and the first lens and the plurality of light-emitting elements of the backlight module are turned on simultaneously; adjusting a first turn-on time of each light-emitting element; controlling a second lens and the backlight module to be turned on simultaneously, where the plurality of light-emitting elements of the backlight module are turned on simultaneously, and the second lens and the plurality of light-emitting elements of the backlight module are turned on simultaneously; and adjusting a second turn-on time of each light-emitting element.