Backlight Module Anti-Peeping Control via Edge Brightness Dimming
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Solution Overview
Problem
Existing display devices require additional hardware for anti-peeping functions, which increases thickness and weight, contradicting the goal of thinning while failing to effectively prevent display content leakage.
Innovation Solution
A control method for display devices that adjusts the brightness of display areas and backlight subareas along the edges, reducing brightness closer to edges and increasing it towards the center when entering anti-peeping mode, without adding hardware, using specific current curves for LED lamp groups to achieve this distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated anti-peeping element (such as a dimming film or anti-peeping film) is added between the display panel and backlight module, then the anti-peeping function is improved, but the thickness and weight of the display device increase
Solution Approach 1:
The patent extracts the anti-peeping function from dedicated hardware elements and relocates it to the backlight control system. By dividing the backlight into multiple independently controllable subareas and adjusting their brightness differently, the anti-peeping effect is achieved without adding physical films or structures between the display panel and backlight module.
Solution Approach 2:
The patent replaces the mechanical/optical approach (using physical anti-peeping films or dimming films) with an electrical control approach. By using independent brightness control of backlight subareas through electrical signals, the same anti-peeping function is achieved without mechanical or optical filtering layers, thereby reducing thickness.
2Reliability
If a dedicated anti-peeping element (such as a dimming film or anti-peeping film) is added between the display panel and backlight module, then the anti-peeping function is improved, but the weight of the display device increases
Solution Approach 1:
The patent extracts the anti-peeping function from dedicated hardware elements and relocates it to the backlight control system. By dividing the backlight into multiple independently controllable subareas and adjusting their brightness differently, the anti-peeping effect is achieved without adding physical films or structures between the display panel and backlight module.
Solution Approach 2:
The patent replaces the mechanical/optical approach (using physical anti-peeping films or dimming films) with an electrical control approach. By using independent brightness control of backlight subareas through electrical signals, the same anti-peeping function is achieved without mechanical or optical filtering layers, thereby reducing weight.
3Reliability
If the backlight is divided into multiple independently controllable subareas with different brightness levels, then the anti-peeping effect is improved, but the device complexity increases
Solution Approach 1:
The patent segments the backlight module into multiple independently controllable subareas (first backlight subarea, second backlight subarea, etc.). Each subarea can be controlled separately through corresponding control instructions, allowing different brightness levels to be applied to different regions of the display device.
Solution Approach 2:
The patent implements dynamic brightness adjustment where the backlight subareas can switch between different brightness states based on operational modes (normal display mode vs. anti-peeping mode). The brightness of each subarea is dynamically controllable through processing circuits that receive and execute control instructions.
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
Effectively prevents display content leakage while maintaining the thinness and lightness of the display device by dynamically adjusting brightness patterns, enhancing security without increasing thickness or weight.
Implementation Method 1
the plurality of LED lamp beads are divided into a number N of lamp groups, and the N lamp groups provide backlights for the N backlight subareas in a one-to-one correspondence
Implementation Method 2
driving currents for all the LED lamp beads in the same lamp group are the same; and the N lamp groups are connected in parallel
Data Source
AI summary
The present disclosure relates to a backlight module, a display device and a control method thereof. The display device includes a first edge, a second edge, and N display areas. The N display areas are disposed between the first edge and the second edge and are arranged along the first direction; the first edge and the second edge are arranged along the first direction; the method includes: in response to a first control instruction for entering an anti-peeping display mode, controlling the display device to enter the anti-peeping display mode, wherein after the display device enters the anti-peeping display mode, among the display areas disposed between a central axis of the display device and the first edge, brightness of a display area closer to the first edge is lower than brightness of a display area closer to the central axis, and among the display areas disposed between the central axis and the second edge, brightness of a display area closer to the second edge is lower than brightness of a display area closer to the central axis, where the central axis is parallel to the first edge.